DE2812C

MAX8671X_08 MAXIM | Alldatasheet

Document overview

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Technical content

Features

♦ 16V-Tolerant USB and DC Inputs ♦ Automatically Powers from External Power or Battery ♦ Operates with No Battery Present ♦ Single-Cell Li+/Li-Poly Charger ♦ Three 2MHz Step-Down Regulators Up to 96% Efficiency ♦ Two Low IQ Linear Regulators ♦ Output Power-Up Sequencing ♦ Thermal-Overload Protection MAX8671X PMIC with Integrated Charger and Smart Power Selector for Handheld Devices 19-0885; Rev 0; 8/07 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com. EVALUATION KIT AVAILABLE

Ordering Information

0.6V TO VSYS 180mA OUT3 1V TO V SYS 425mA OUT2 1V TO V SYS 425mA OUT1 1V TO V SYS 425mA AC-TO-DC ADAPTER USB OUT1 OUT2 OUT3 OUT4 OUT5 SYSDC USB ENON OFF μP PEN1 PEN2 USUS CEN CST1 CST2 DOK UOK Li+/LiPo BATTERY PWM OUT5 0.6V TO V SYS 180mA MAX8671X Simplified Applications Circuit PART TEMP RANGE PIN-PACKAGE PKG CODE MAX8671XETL+ -40°C to +85°C 40 Thin QFN-EP* 5mm x 5mm T4055-1 Smart Power Selector is a trademark of Maxim Integrated Products, Inc. +Denotes a lead-free package. *EP = Exposed paddle.

PMIC with Integrated Charger and Smart Power Selector for Handheld Devices Table of Contents

PMIC with Integrated Charger and Smart Power Selector for Handheld Devices ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(DC, USB, BVSET, UOK, DOK, LX_ unconnected; VTHM = VL/2, VPG_ = VAGND = 0V, VBAT = 4V, CEN = low, USUS = low, EN = high, VPEN1 = VPEN2 = 3.3V, VPWM = 0V, COUT4 = 1µF, COUT5 = 1µF, CSYS = 10µF, PV1 = PV2 = PV3 = PV4 = PV5 = SYS, R DISET = 3kΩ, wise noted.) (Note 2) Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specificatio ns is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. CISET, DISET, BVSET, CT, THM to AGND..-0.3V to (V VL + 0.3V) Continuous Power Dissipation (T A = +70°C) 40-Pin, 5mm x 5mm, Thin QFN (derate 35.7mW/°C PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS DC POWER INPUT (VDC = 5.0V, EN = low) Operating voltage 4.1 6.6DC Voltage Range V DC Withstand voltage 0 14 V SYS Regulation Voltage V SYS_REG VDC = 6V, USUS = low, CEN = high, system current is less than the input current limit 5.2 5.3 5.4 V DC Undervoltage Threshold V DCL VDC rising, 500mV typical hysteresis 3.95 4.00 4.05 V DC Overvoltage Threshold V DCH VDC rising, 400mV typical hysteresis 6.8 6.9 7.0 V PEN1 = low, PEN2 = low, USUS = low 90 95 100 PEN1 = low, PEN2 = high, USUS = low 450 475 500DC Current Limit I DCLIM VDC = 6V, VSYS = 5V USB unconnected, CEN = low, TA = +25°C, VL = no load (Note 3) PEN1 = high, RDISET = 3kΩ 950 1000 1050 mA RDISET Resistance Range 36 k Ω PEN1 = low, USUS = high 0.11 USUS = low, CEN = low; ISYS = 0mA, IBAT = 0mA, EN = low; VL no load 1.1DC Quiescent Current I DCIQ USUS = low, CEN = high; ISYS = 0mA, VEN = 0V, VL no load 0.7 mA Minimum DC-to-BAT Voltage Headroom VDC falling, 200mV hysteresis 0 15 30 mV Minimum DC-to-SYS Voltage Headroom VDC falling, 200mV hysteresis 0 15 30 mV DC-to-SYS Dropout Resistance R DS VDC = 5V, ISYS = 400mA, USUS = low 0.325 0.600 Ω Note 1: LX_ has internal clamp diodes to PG_ and PV_. Applications that forward bias these diodes must take care not to exceed the package power dissipation limits.

PMIC with Integrated Charger and Smart Power Selector for Handheld Devices PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Starting DC when no USB present 1.0 msDC-to-SYS Soft-Start Time t SS-D-S Starting DC with USB present 35 µs DC Thermal-Limit Temperature Die temperature at which current limit is reduced +100 °C DC Thermal-Limit Gain Amount of input current reduction above thermal-limit temperature 5 %/°C USB POWER INPUT (VUSB = 5.0V, EN = low) Operating voltage 4.1 6.6USB Voltage Range V USB Withstand voltage 0 14 V SYS Regulation Voltage V SYS_REG VUSB = 6V, USUS = low, CEN = high, system current is less than the input current limit 5.2 5.3 5.4 V USB Undervoltage Threshold V USBL VUSB rising, 500mV hysteresis 3.95 4.0 4.05 V USB Overvoltage Threshold V USBH VUSB rising, 400mV hysteresis 6.8 6.9 7.0 V PEN2 = low, USUS = low 90 95 100 USB Current Limit I USBLIM VUSB = 6V, VSYS = 5V, DC unconnected, CEN = low, TA = +25°C, IVL = 0A (Note 3) PEN2 = high, USUS = low 450 475 500 mA USUS = high 0.11 USUS = low, CEN = low; ISYS = 0mA, IBAT = 0mA, VL no load 1.1 2.0 USB Quiescent Current I USBIQ USUS = low, CEN = high; ISYS = 0mA, VL no load 0.7 1.3 mA Minimum USB-to-BAT Voltage Headroom VUSB falling, 200mV hysteresis 0 15 30 mV Minimum USB-to-SYS Voltage Headroom VUSB falling, 200mV hysteresis 0 15 30 mV USB-to-SYS Dropout Resistance R US VUSB = 5V, ISYS = 400mA, USUS = low 0.325 0.600 Ω USB-to-SYS Soft-Start Time t SS-U-S 1.0 ms USB Thermal-Limit Temperature Die temperature at which current limit is reduced 100 °C USB Thermal-Limit Gain Amount of input current reduction above thermal-limit temperature 5 %/°C SYSTEM (VDC = 5.0V, EN = low) System Operating Voltage Range V SYS 2.6 5.5 V System Undervoltage Threshold V UVLO_SYS SYS falling, 100mV hysteresis 2.45 2.50 2.55 V ELECTRICAL CHARACTERISTICS (continued) (DC, USB, BVSET, UOK, DOK, LX_ unconnected; VTHM = VL/2, VPG_ = VAGND = 0V, VBAT = 4V, CEN = low, USUS = low, EN = high, VPEN1 = VPEN2 = 3.3V, VPWM = 0V, COUT4 = 1µF, COUT5 = 1µF, CSYS = 10µF, PV1 = PV2 = PV3 = PV4 = PV5 = SYS, R DISET = 3kΩ, wise noted.) (Note 2)

PMIC with Integrated Charger and Smart Power Selector for Handheld Devices PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS BAT is sourcing 105mA 65 82 115 BAT-to-SYS Reverse Regulation Voltage VBSREG DC or USB and BAT are sourcing current BAT is sourcing 905mA 130 mV DC and USB unconnected, EN = low, VBAT = 4V 01 0 VDC = VUSB = 5V, USUS = high, PEN1 = low, EN = low, VBAT = 4V 01 0 DC and USB unconnected, EN = high, VBAT = 4V (step-down converters are not in dropout), PWM = low (Note 4) 155 285 DC and USB unconnected, EN = high, VBAT = 2.8V (at least one step-down conver ter i s i n d r op out) , P W M = l ow ( N ote 4) 425 550 VDC = VUSB = 5V, USUS = high, EN = high, VBAT = 4V, PWM = low (Note 4) 180 320 µA Quiescent Current IPV1 + IPV2 + IPV3 + IPV4 + IPV5 + ISYS DC and USB unconnected, EN = high, V BAT = 4.0V, PWM = high 9m A BATTERY CHARGER (VDC = 5.0V, EN = low) BAT-to-SYS On-Resistance R BS VUSB = 0V, VBAT = 4.2V, ISYS = 1A 0.08 0.16 Ω TA = +25°C 4.174 4.200 4.221BVSET = VL or BVSET unconnected TA = -40°C to +85°C 4.145 4.200 4.242 TA = +25°C 4.325 4.350 4.376 BAT Regulation Voltage (Figure 6) VBATREG RBVSET = 49.9kΩ to AGND TA = -40°C to +85°C 4.297 4.350 4.398 V BAT Recharge Threshold V BATRCHG (Note 5) -170 -120 -70 mV BAT Prequalification Threshold V BATPRQ VBAT rising, 180mV hysteresis, Figure 6 2.9 3.0 3.1 V RCISET Resistance Range Guaranteed by BAT fast-charge current limit 31 5 k Ω CISET Voltage V CISET RCISET = 7.5kΩ, IBAT = 267mA, Figure 9 0.9 1.0 1.1 V ELECTRICAL CHARACTERISTICS (continued) (DC, USB, BVSET, UOK, DOK, LX_ unconnected; VTHM = VL/2, VPG_ = VAGND = 0V, VBAT = 4V, CEN = low, USUS = low, EN = high, VPEN1 = VPEN2 = 3.3V, VPWM = 0V, COUT4 = 1µF, COUT5 = 1µF, CSYS = 10µF, PV1 = PV2 = PV3 = PV4 = PV5 = SYS, R DISET = 3kΩ, wise noted.) (Note 2)

PMIC with Integrated Charger and Smart Power Selector for Handheld Devices PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Low-power USB charging from the USB input, DC unconnected, RCISET = 3kΩ, PEN2 = low, USUS = low 87 92 100 Low-power USB charging from the DC input, RCISET = 3kΩ, PEN1 = low, PEN2 = low, USUS = low 87 92 100 High-power USB charging from the USB input, DC unconnected, RCISET = 3kΩ, PEN2 = high, USUS = low 450 472 500 High-power USB charging from the DC input, RCISET = 3kΩ, PEN2 = high, USUS = low 450 472 500 AC-to-DC adapter charging from the DC input, RDISET = 3kΩ, RCISET = 15kΩ, PEN1 = high 170 200 230 AC-to-DC adapter charging from the DC input, RDISET = 3kΩ, RCISET = 7.5kΩ, PEN1 = high 375 400 425 BAT Fast-Charge Current Limit AC-to-DC adapter charging from the DC input, RDISET = 3kΩ, RCISET = 3.74kΩ, PEN1 = high 750 802 850 mA BAT Prequalification Current V BAT = 2.5V, RCISET = 3.74kΩ 65 82 100 mA Top-Off Threshold T A = +25°C, RCISET = 3.74kΩ (Note 6) 20 30 40 mA No DC or USB power connected 0+ 5 BAT Leakage Current EN = low, TA = +25°C DC and/or USB power connected, CEN = high -5 1 +5 µA Slew rate 450 mA/ms Time from 0mA to 500mA 1.10 Time from 0mA to 100mA 0.22Charger Soft-Start Time t SS_CHG Time from 100mA to 500mA 0.88 ms Timer Accuracy C CT = 0.15µF -20 +20 % Timer Suspend Threshold CISET voltage when the fast-charge timer suspends; 300mV translates to 20% of the maximum fast-charge current limit 250 300 350 mV Timer Extend Threshold CISET voltage when the fast-charge timer suspends; 750mV translates to 50% of the maximum fast-charge current limit 700 750 800 mV ELECTRICAL CHARACTERISTICS (continued) (DC, USB, BVSET, UOK, DOK, LX_ unconnected; VTHM = VL/2, VPG_ = VAGND = 0V, VBAT = 4V, CEN = low, USUS = low, EN = high, VPEN1 = VPEN2 = 3.3V, VPWM = 0V, COUT4 = 1µF, COUT5 = 1µF, CSYS = 10µF, PV1 = PV2 = PV3 = PV4 = PV5 = SYS, R DISET = 3kΩ, wise noted.) (Note 2)

PMIC with Integrated Charger and Smart Power Selector for Handheld Devices PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Prequalification Time t PQ CCT = 0.15µF 33 min Fast-Charge Time t FC CCT = 0.15µF 660 min Top-Off Time t TO 15 s THERMISTOR INPUT (THM) (VDC = 5.0V, EN = low) THM Threshold, Cold V THMC VTHM rising, 65mV hysteresis 73.0 74.0 75.5 % of VVL THM Threshold, Hot V THMH VTHM falling, 65mV hysteresis 27.0 28.4 30.0 % of VVL THM = AGND or VL, TA = +25°C -0.100 0.001 +0.200THM Input Leakage Current I THM THM = AGND or VL, TA = +85°C 0.01 µA POWER SEQUENCING (Figures 11 and 12) EN to REG3 Enable Delay t D1 120 µs REG1 Soft-Start Time t SS1 2.6 ms REG3 to REG1/2 Delay t D2 0.4 ms REG2 Soft-Start Time t SS2 2.6 ms REG3 Soft-Start Time t SS3 2.6 ms REG1/2 to REG4 Delay t D3 0.3 ms REG4 Soft-Start Time t SS4 3.0 ms REG5 Soft-Start Time t SS5 3.0 ms REGULATOR THERMAL SHUTDOWN Thermal Shutdown Temperature T J rising +165 °C Thermal Shutdown Hysteresis 15 °C REG1—SYNCHRONOUS STEP-DOWN CONVERTER Input Voltage PV1 supplied from SYS V SYS V Maximum Output Current L = 4.7µH, R L = 0.13Ω (Note 7) 425 mA FB1 Voltage (Note 8) 0.997 1.012 1.028 V Adjustable Output Voltage Range 1 V SYS V TA = +25°C -50 -5 +50FB1 Leakage Current V FB1 = 1.012V TA = +85°C -5 nA Load Regulation PWM mode 4.4 %/A Line Regulation PWM mode (Note 9) 1 %/D p-Channel On-Resistance V PV1 = 4V, ILX1 = 180mA 165 330 m Ω n-Channel On-Resistance V PV1 = 4V, ILX1 = 180mA 200 400 m Ω p-Channel Current-Limit Threshold 0.555 0.615 0.675 A ELECTRICAL CHARACTERISTICS (continued) (DC, USB, BVSET, UOK, DOK, LX_ unconnected; VTHM = VL/2, VPG_ = VAGND = 0V, VBAT = 4V, CEN = low, USUS = low, EN = high, VPEN1 = VPEN2 = 3.3V, VPWM = 0V, COUT4 = 1µF, COUT5 = 1µF, CSYS = 10µF, PV1 = PV2 = PV3 = PV4 = PV5 = SYS, R DISET = 3kΩ, wise noted.) (Note 2)

PMIC with Integrated Charger and Smart Power Selector for Handheld Devices PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Skip Mode Transition Current (Note 10) 60 mA n-Channel Zero-Crossing Threshold 10 mA Maximum Duty Cycle 100 % Minimum Duty Cycle PWM mode 12.5 % Internal Oscillator Frequency 1.8 2.0 2.2 MHz Internal Discharge Resistance in Shutdown EN = low, resistance from LX1 to PG1 0.5 1.0 2.0 k Ω REG2—SYNCHRONOUS STEP-DOWN CONVERTER Input Voltage PV2 supplied from SYS V SYS V Maximum Output Current L = 4.7µH, R L = 0.13Ω (Note 7) 425 mA FB2 Voltage (Note 8) 0.997 1.012 1.028 V Adjustable Output Voltage Range 1 V SYS V TA = +25°C -50 -5 +50FB2 Leakage Current V FB2 = 1.012V TA = +85°C -50 nA Load Regulation PWM mode 4.4 %/A Line Regulation PWM mode (Note 9) 1 %/D p-Channel On-Resistance V PV2 = 4V, ILX2 = 180mA 200 400 m Ω n-Channel On-Resistance V PV2 = 4V, ILX2 = 180mA 150 265 m Ω p-Channel Current-Limit Threshold 0.555 0.615 0.675 A Skip Mode Transition Current (Note 10) 60 mA n-Channel Zero-Crossing Threshold 10 mA Maximum Duty Cycle 100 % Minimum Duty Cycle PWM mode 12.5 % Internal Oscillator Frequency 1.8 2.0 2.2 MHz Internal Discharge Resistance in Shutdown EN = low, resistance from LX2 to PG2 0.5 1.0 2.0 k Ω REG3—SYNCHRONOUS STEP-DOWN CONVERTER Input Voltage PV3 supplied from SYS V SYS V Maximum Output Current L = 4.7µH, R L = 0.13Ω (Note 7) 425 mA FB3 Voltage (Note 8) 0.997 1.012 1.028 V Adjustable Output Voltage Range 1 V SYS V TA = +25°C -50 -5 +50FB3 Leakage Current V FB2 = 1.012V TA = +85°C -50 nA Load Regulation PWM mode 4.4 %/A ELECTRICAL CHARACTERISTICS (continued) (DC, USB, BVSET, UOK, DOK, LX_ unconnected; VTHM = VL/2, VPG_ = VAGND = 0V, VBAT = 4V, CEN = low, USUS = low, EN = high, VPEN1 = VPEN2 = 3.3V, VPWM = 0V, COUT4 = 1µF, COUT5 = 1µF, CSYS = 10µF, PV1 = PV2 = PV3 = PV4 = PV5 = SYS, R DISET = 3kΩ, wise noted.) (Note 2)

PMIC with Integrated Charger and Smart Power Selector for Handheld Devices PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Line Regulation PWM mode (Note 9) 1 %/D p-Channel Current-Limit Threshold 0.555 0.615 0.675 A Skip Mode Transition Current (Note 10) 60 mA n-Channel Zero-Crossing Threshold 10 mA p-Channel On-Resistance V PV3 = 4V, ILX3 = 180mA 230 460 m Ω n-Channel On-Resistance V PV3 = 4V, ILX3 = 180mA 120 210 m Ω Maximum Duty Cycle 100 % Minimum Duty Cycle PWM mode 12.5 % Internal Oscillator Frequency 1.8 2.0 2.2 MHz Internal Discharge Resistance in Shutdown EN = low, resistance from LX3 to PG3 0.5 1.0 2.0 k Ω REG4—LINEAR REGULATOR PV4 Operating Range V PV4 1.7 V SYS V PV4 Undervoltage Lockout Threshold VPV4 rising, 100mV hysteresis 1.55 1.60 1.65 V FB4 Voltage No load 0.582 0.600 0.618 V TA = +25°C -50 -5 +50FB4 Leakage Current V FB4 = 0.6V TA = +85°C -5 nA VFB4 = 0.54V 200 230 265Current Limit VFB4 = 0V 235 mA Output Noise 10Hz to 100kHz; COUT4 = 3.3µF, IOUT4 = 10mA, VPV4 = 2V, VOUT4 set for 1.8V 120 µV RMS f = 1kHz, IOUT4 = 10mA, VPV4 = 2V, VOUT4 set for 1.8V 67 PSRR f = 10kHz, IOUT4 = 10mA, VPV4 = 2V, VOUT4 set for 1.8V 50 dB Internal Discharge Resistance in Shutdown EN = low, resistance from OUT4 to AGND 0.5 1.0 2.0 k Ω ELECTRICAL CHARACTERISTICS (continued) (DC, USB, BVSET, UOK, DOK, LX_ unconnected; VTHM = VL/2, VPG_ = VAGND = 0V, VBAT = 4V, CEN = low, USUS = low, EN = high, VPEN1 = VPEN2 = 3.3V, VPWM = 0V, COUT4 = 1µF, COUT5 = 1µF, CSYS = 10µF, PV1 = PV2 = PV3 = PV4 = PV5 = SYS, R DISET = 3kΩ, wise noted.) (Note 2)

PMIC with Integrated Charger and Smart Power Selector for Handheld Devices PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS REG5—LINEAR REGULATOR PV5 Operating Range V PV5 1.7 V SYS V PV5 Undervoltage Lockout Threshold VPV5 rising, 100mV hysteresis 1.55 1.60 1.65 V FB5 Voltage No load 0.582 0.600 0.618 V TA = +25°C -50 -5 +50FB5 Leakage Current V FB5 = 0.6V TA = +85°C -5 nA VFB5 = 0.54V 200 230 265Current Limit VFB5 = 0V 235 mA Output Noise 10Hz to 100kHz, C OU T5 = 2.2µF, IOU T5 = 10m A, V P V 5 = 3.5V , V OU T5 set for 3.3V 180 µV RMS f = 1kHz, IOUT5 = 10mA, VPV5 = 3.5V, VOUT5 set for 3.3V 62 PSRR f = 10kHz, IOUT5 = 10mA, VPV5 = 3.5V, VOUT5 set for 3.3V 44 dB Internal Discharge Resistance in Shutdown EN = low, resistance from OUT5 to AGND 0.5 1.0 2.0 k Ω VL—LINEAR REGULATOR VL Voltage V VL IVL = 0mA to 3mA 3.0 3.3 3.6 V LOGIC (UOK, DOK, PEN1, PEN2, USUS, CEN, CST1, CST2, EN, PWM) Logic Input-Voltage Low VUSB or VDC = 4.1V to 6.6V, VSYS = 2.6V to 5.5V 0.6 V Logic Input-Voltage High VUSB or VDC = 4.1V to 6.6V, VSYS = 2.6V to 5.5V 1.3 V TA = +25°C 0.001 1Logic Input Leakage Current V LOGIC = 0V to 5.5V TA = +85°C 0.01 µA Logic Output-Voltage Low I SINK = 1mA 10 30 mV TA = +25°C 0.001 1Logic Output-High Leakage Current VLOGIC = 5.5V TA = +85°C 0.01 µA TRI-STATE INPUT (BVSET) BVSET Input-Voltage Low V USB or VDC = 4.1V to 6.6V 0.3 V BVSET Input-Voltage Mid V USB or VDC = 4.1V to 6.6V 1.2 VVL - 1.2 V ELECTRICAL CHARACTERISTICS (continued) (DC, USB, BVSET, UOK, DOK, LX_ unconnected; VTHM = VL/2, VPG_ = VAGND = 0V, VBAT = 4V, CEN = low, USUS = low, EN = high, VPEN1 = VPEN2 = 3.3V, VPWM = 0V, COUT4 = 1µF, COUT5 = 1µF, CSYS = 10µF, PV1 = PV2 = PV3 = PV4 = PV5 = SYS, R DISET = 3kΩ, wise noted.) (Note 2)

PMIC with Integrated Charger and Smart Power Selector for Handheld Devices Note 2: Limits are 100% production tested at TA = +25°C. Limits over the operating temperature range are guaranteed through cor- relation using statistical quality control (SQC) methods. Note 3: The USB/DC current limit does not include the VL output current. See the VL Linear Regulator section for more information. Note 4: Quiescent current excludes the energy needed for the REG1–REG5 external resistor-dividers. All typical operating charac- teristics include the energy for the REG1–REG5 external resistor-dividers. For the circuit of Figure 1, the typical quiescent current with DC and USB unconnected, EN = high, VBAT = 4V, and PWM = low is 175µA. Note 5: The charger transitions from done to fast-charge mode at this BAT recharge threshold (Figure 7). Note 6: The charger transitions from fast-charge to top-off mode at this top-off threshold (Figure 7). Note 7: The maximum output current is guaranteed by correlation to the p-channel current-limit threshold, p-channel on-resistance, n-channel on-resistance, oscillator frequency, input voltage range, and output voltage range. The parameter is stated for a 4.7µH inductor with 0.13Ω series resistance. See the Step-Down Converter Output Current section for more information. Note 8: The step-down output voltages are 1% high with no load due to the load-line architecture. When calculating the external resistor-dividers, use an FB_ voltage of 1.000V. Note 9: Line regulation for the step-down converters is measured as ΔVOUT/ΔD, where D is the duty cycle (approximately VOUT/VIN). Note 10: The skip mode current threshold is the transition point between fixed-frequency PWM operation and skip mode operation. The specification is given in terms of output load current for inductor values shown in the typical application circuits. PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS BVSET Input-Voltage High V USB or VDC = 4.1V to 6.6V VVL - 0.3 VVL + 0.3 V Internal BVSET Pullup Resistance 52.5 k Ω External BVSET Pulldown Resistance for Midrange Voltage RBVSET 45 50 55 k Ω ELECTRICAL CHARACTERISTICS (continued) (DC, USB, BVSET, UOK, DOK, LX_ unconnected; VTHM = VL/2, VPG_ = VAGND = 0V, VBAT = 4V, CEN = low, USUS = low, EN = high, VPEN1 = VPEN2 = 3.3V, VPWM = 0V, COUT4 = 1µF, COUT5 = 1µF, CSYS = 10µF, PV1 = PV2 = PV3 = PV4 = PV5 = SYS, R DISET = 3kΩ, wise noted.) (Note 2)

PMIC with Integrated Charger and Smart Power Selector for Handheld Devices 0.4 0.2 0.8 0.6 1.0 1.2 1.4 1.6 04 6 2 8 10 12 14 16 QUIESCENT CURRENT vs. DC OR USB SUPPLY VOLTAGE MAX8671X toc01 INPUT VOLTAGE (V) INPUT CURRENT (mA) CHARGER ENABLED NO BATTERY INPUT VOLTAGE AT DC OR USB WITH THE OTHER INPUT LEFT UNCONNECTED FALLING RISING 0.4 0.2 0.8 0.6 1.0 1.2 1.4 1.6 04 6 2 8 10 12 14 16 QUIESCENT CURRENT vs. DC OR USB SUPPLY VOLTAGE MAX8671X toc02 INPUT VOLTAGE (V) INPUT CURRENT (mA) CHARGER ENABLED NO BATTERY INPUT VOLTAGE AT DC OR USB WITH THE OTHER INPUT LEFT UNCONNECTED FALLING RISING 0.10 0.05 0.20 0.15 0.30 0.25 0.35 0.45 0.40 0.50 04 6 2 8 10 12 14 16USB QUIESCENT CURRENT vs. USB SUPPLY VOLTAGE, USB SUSPEND MAX8671X toc03 USB VOLTAGE (V) USB CURRENT (mA) USB VOLTAGE RISING 0.4 0.2 0.8 0.6 1.2 1.0 1.4 BATTERY LEAKAGE CURRENT vs. BATTERY VOLTAGE WHEN REGULATORS ARE POWERED FROM USB MAX8671X toc04 BATTERY VOLTAGE (V) BATTERY LEAKAGE CURRENT (μA) VUSB = 5V VDC = 0V PEN1 = PEN2 = 1 EN = 1 0.2 0.1 0.5 0.4 0.3 0.7 0.6 0.8 BATTERY LEAKAGE CURRENT vs. BATTERY VOLTAGE MAX8671X toc05 BATTERY VOLTAGE (V) BATTERY LEAKAGE CURRENT (μA) NO EXTERNAL POWER EN = LOW CEN = HIGH Typical Operating Characteristics (Circuit of Figure 1, IVL = 0mA, TA = +25°C, unless otherwise noted.)

PMIC with Integrated Charger and Smart Power Selector for Handheld Devices 3.00 3.50 4.50 4.00 5.00 5.50 0 400 200 600 800 1000 VSYS vs. SYS CURRENT MAX8671X toc12 SYS CURRENT (mA) VSYS (V) DC OPEN, VUSB = 5.1V, VBAT = 4.0V PEN1 = 1, PEN2 = 0, CHARGER DISABLED 3.00 3.50 4.50 4.00 5.00 5.50 0 400 200 600 800 1000 VSYS vs. SYS CURRENT MAX8671X toc13 SYS CURRENT (mA) VSYS (V) DC OPEN, VUSB = 5.1V, VBAT = 4.0V PEN1 = 1, PEN2 = 0, CHARGER DISABLED 150 100 200 250 300 350 400 450 500 CHARGE CURRENT vs. BATTERY VOLTAGE WITH USB INPUT MAX8671X toc06 BATTERY VOLTAGE (V) CHARGE CURRENT (mA) PEN2 = 1 VUSB = 5.0V VDC = 0V PEN1 = 1 PEN2 = 0 150 100 200 250 300 350 400 450 500 CHARGE CURRENT vs. BATTERY VOLTAGE MAX8671X toc07 BATTERY VOLTAGE (V) CHARGE CURRENT (mA) RCISET = 10kΩ VUSB = 5.0V VDC = 0V PEN1 = 1, PEN2 = 1 RCISET = 6.04kΩ 150 100 200 250 300 350 400 450 500 -40 10 -15 35 60 85 CHARGE CURRENT vs. AMBIENT TEMPERATURE, LOW POWER DISSIPATION MAX8671X toc08 AMBIENT TEMPERATURE (°C) CHARGE CURRENT (mA) VUSB = 5.0V VDC = 0V VBAT = 4.0V PEN1 = 1 PEN2 = 1 PEN2 = 0 150 100 200 250 300 350 400 450 500 -40 10 -15 35 60 85 CHARGE CURRENT vs. AMBIENT TEMPERATURE, HIGH IC POWER DISSIPATION MAX8671X toc09 AMBIENT TEMPERATURE (°C) CHARGE CURRENT (mA) VUSB = 6.5V VDC = 0V VBAT = 3.1V PEN1 = 1 PEN2 = 1 PEN2 = 0 4.00 4.15 4.10 4.05 4.20 4.25 4.30 4.35 4.40 4.45 4.50 -40 10 -15 35 60 85 BATTERY REGULATION VOLTAGE vs. TEMPERATURE MAX8671X toc10 AMBIENT TEMPERATURE (°C) BATTERY VOLTAGE (V) VUSB = 5V VDC = 0V PEN1 = 1 PEN2 = 0 BVSET = VL NO LOAD 3.80 3.90 3.85 4.00 3.95 4.05 4.10 0 400 200 600 800 1000 VSYS vs. SYS CURRENT MAX8671X toc11 SYS CURRENT (mA) VSYS (V) DC OPEN, USB OPEN, VBAT = 4.0V THE SLOPE SHOWS THE SYSTEM LOAD SWITCH HAS AN ON-RESISTANCE OF 81mΩ. Typical Operating Characteristics (continued) (Circuit of Figure 1, IVL = 0mA, TA = +25°C, unless otherwise noted.)

PMIC with Integrated Charger and Smart Power Selector for Handheld Devices 2ms/div USB CONNECT (NO SYS LOAD) VUSB IUSB 2V/div 500mA/div 5V/div 5V/div MAX8671X toc14 VUOK VSYS IBAT 4.0V 500mA/div 4.14V -475mA CHARGING 0mA 0mA LOAD ON SYS, 4.0V BATTERY, 5.0V USB INPUT Typical Operating Characteristics (continued) (Circuit of Figure 1, IVL = 0mA, TA = +25°C, unless otherwise noted.) 2ms/div USB CONNECT (50mA SYS LOAD) VUSB IUSB 2V/div 500mA/div 5V/div 5V/div MAX8671X toc15 VUOK VSYS IBAT 4.0V 500mA/div 4.14V -425mA CHARGING +50mA 50mA LOAD ON SYS, 4.0V BATTERY, 5.0V USB INPUT 2ms/div USB DISCONNECT (50mA SYS LOAD) VUSB IUSB 2V/div 500mA/div 5V/div 5V/div MAX8671X toc16 VUOK VSYS IBAT 4.0V 500mA/div 4.14V -425mA CHARGING 50mA LOAD ON SYS, 4.0V BATTERY, 5.0V USB INPUT +50mA 400μs/div USB SUSPEND VUSB IUSB 5V/div 2V/div 500mA/div 5V/div 5V/div MAX8671X toc17 VCST1 VCST2 VSYS IBAT 4.0V 500mA/div 4.14V 50mA LOAD ON SYS, 4.0V BATTERY, 5.0V USB INPUT +50mA -425mA 400μs/div USB RESUME VUSUS IUSB 5V/div 2V/div 500mA/div 5V/div 5V/div MAX8671X toc18 VCST1 VCST2 VSYS IBAT 4.0V 500mA/div 4.14V 50mA LOAD ON SYS, 4.0V BATTERY, 5.0V USB INPUT +50mA -425mA

PMIC with Integrated Charger and Smart Power Selector for Handheld Devices 4ms/div POWER-UP SEQUENCING VEN VOUT1 VOUT2 VOUT3 VOUT4 VOUT5 VVL IUSB 50mA/div 5V/div 5V/div 5V/div 2V/div 5V/div 5V/div 5V/div MAX8671X toc22 400μs/div AC-TO-DC ADAPTER CONNECT WITH USB VSYS IDC 500mA/div 500mA/div 5V/div MAX8671X toc19 IUSB IBAT 4.0V 500mA/div 4.14V 25Ω LOAD ON SYS, PEN1 = PEN2 = HIGH 1A DC LIMIT, RDISET = 3.01kΩ -330mA -840mA 400μs/div AC-TO-DC ADAPTER CONNECT WITH NO USB VSYS IDC 500mA/div 2V/div MAX8671X toc20 IBAT 500mA/div 4.14V 25Ω LOAD ON SYS, PEN1 = PEN2 = HIGH 1A DC LIMIT +160mA -840mA 20ms/div AC-TO-DC ADAPTER DISCONNECT WITH USB VSYS IDC 500mA/div 500mA/div 2V/div MAX8671X toc21 IBAT IUSB 500mA/div 4.14V 25Ω LOAD ON SYS, PEN1 = PEN2 = HIGH 1A DC LIMIT -840mA +160mA -330mA Typical Operating Characteristics (continued) (Circuit of Figure 1, IVL = 0mA, TA = +25°C, unless otherwise noted.)

PMIC with Integrated Charger and Smart Power Selector for Handheld Devices Typical Operating Characteristics (continued) (Circuit of Figure 1, IVL = 0mA, TA = +25°C, unless otherwise noted.) REG1 EFFICIENCY vs. LOAD CURRENT MAX8671X toc23 LOAD CURRENT (mA) EFFICIENCY (%) 10010 100 1 1000 PWM = 0 VOUT1 = 2.8V PWM = 1 V OUT1 = 2.8V VBATT = 4V 2.700 2.760 2.740 2.720 2.780 2.800 2.820 2.840 2.860 2.880 2.900 0 100 50 150 200 250 REG1 LOAD REGULATION MAX8671X toc24 OUTPUT CURRENT (mA) OUTPUT VOLTAGE (V) RFBH = 182kΩ RFBL = 100kΩ 4μs/div REG1 LIGHT-LOAD SWITCHING WAVEFORMS (PWM = 0) VOUT1 VLX1 ILI MAX8671X toc26 200mA/div 2V/div 20mV/div (AC-COUPLED) 20mA LOAD 200ns/div REG1 LIGHT-LOAD SWITCHING WAVEFORMS (PWM = 1) VOUT1 VLX1 ILI MAX8671X toc27 100mA/div 2V/div 10mV/div 20mA LOAD 400ns/div REG1 HEAVY-LOAD SWITCHING WAVEFORMS VOUT1 VLX1 ILI MAX8671X toc28 100mA/div 2V/div 10mV/div (AC-COUPLED) 20mA LOAD 100μs/div REG1 LINE TRANSIENT VSYS VOUT1 MAX8671X toc29 20mV/div 2V/div 25mA LOAD 3.3V 5.3V 3.3V 20μs/div REG1 LOAD TRANSIENT IOUT1 VOUT1 MAX8671X toc30 100mA/div 50mV/div (AC-COUPLED) 250mA 25mA25mA 100 120 140 160 180 200 0 200 100 300 400 500 REG1 DROPOUT VOLTAGE vs. LOAD CURRENT MAX8671X toc25 OUTPUT CURRENT (mA) DROPOUT VOLTAGE (mV) VOUT1 = 3.3V VOUT1 = 2.8V THE NOMINAL INDUCTOR DC RESISTANCE IS 140mΩ. THE NOMINAL p-CHANNEL RESISTANCE OF THE REGULATOR IS 200mΩ AT 2.8V AND 185mΩ AT 3.3V. THE SLOPE OF THE LINE SHOWS THAT THE TOTAL DROPOUT RESISTANCE OF AN AVERAGE PART, BOARD, INDUCTOR COMBINATION IS 330mΩ AT 3.3V AND 354mΩ AT 2.8V. SYS IS 100mV BELOW THE REG1 NOMINAL REGULATION VOLTAGE.

PMIC with Integrated Charger and Smart Power Selector for Handheld Devices REG2 LOAD REGULATION MAX8671X toc32 OUTPUT CURRENT (mA) OUTPUT VOLTAGE (V) 20015010050 1.45 1.50 1.55 1.60 1.40 0 250 1.10 1.16 1.14 1.12 1.18 1.20 1.22 1.24 1.26 1.28 1.30 0 100 50 150 200 250 REG3 LOAD REGULATION MAX8671X toc34 OUTPUT CURRENT (mA) OUTPUT VOLTAGE (V) RFBH = 20kΩ RFBL = 100kΩ 10μs/div OUT3 LIGHT-LOAD SWITCHING WAVEFORMS (PWM = 0) IL1 VOUT1 VLX1 MAX8671X toc35 200mA/div 20mV/div 2V/div 10mA LOAD 400ns/div OUT3 HEAVY-LOAD SWITCHING WAVEFORMS IL1 VOUT1 VLX1 MAX8671X toc36 200mA/div 10mV/div 2V/div 250mA LOAD 40μs/div OUT3 LOAD TRANSIENT IOUT1 VOUT1 MAX8671X toc37 100mA/div 100mV/div 250mA 25mA 25mA PWM = 0 100 1 10 100 1000 REG3 EFFICIENCY vs. LOAD CURRENT MAX8671X toc33 LOAD CURRENT (mA) EFFICIENCY (%) PWM = 0 VOUT2 = 1.2V PWM = 1 V OUT2 = 1.2V VBATT = 4.0V Typical Operating Characteristics (continued) (Circuit of Figure 1, IVL = 0mA, TA = +25°C, unless otherwise noted.) 100 1 10 100 1000 REG2 EFFICIENCY vs. LOAD CURRENT MAX8671X toc31 LOAD CURRENT (mA) EFFICIENCY (%) PWM = 0 VOUT2 = 1.5V PWM = 1 V OUT2 = 1.5V VBATT = 4.0V

PMIC with Integrated Charger and Smart Power Selector for Handheld Devices Typical Operating Characteristics (continued) (Circuit of Figure 1, IVL = 0mA, TA = +25°C, unless otherwise noted.) 2.534 2.540 2.538 2.536 2.542 2.544 2.546 2.548 2.550 2.552 2.554 05 0 100 150 REG4 LOAD REGULATION MAX8671X toc38 OUTPUT CURRENT (mA) OUTPUT VOLTAGE (V) RFBH = 316kΩ RFBL = 100kΩ VSYS = 4V 3.240 3.246 3.244 3.242 3.248 3.250 3.252 3.254 3.256 3.258 3.260 05 0 100 150 REG5 LOAD REGULATION MAX8671X toc41 OUTPUT CURRENT (mA) OUTPUT VOLTAGE (V) VUSB = 5V 100μs/div REG4 LINE TRANSIENT VOUT4 VPV4 MAX8671X toc39 10mV/div 2V/div 3.3V 5.3V 3.3V PV = SYS 13.4Ω LOAD 40μs/div REG4 LOAD TRANSIENT IOUT4 VOUT4 MAX8671X toc40 100mV/div 50mV/div 150mA 50mA 50mA VPV4 = VSYS = 4V VOUT4 = 2.5V 40μs/div REG5 LOAD TRANSIENT IOUT5 VOUT5 MAX8671X toc42 100mV/div 50mV/div 150mA 50mA 50mA VUSB = 5V, VOUT5 = 3.3V

if they are configured as a USB power input. inputs. As shown in Table 1, the DC current limit is controlled by PEN1, PEN2, USUS, and RDISET. limit is controlled by PEN1, PEN2, and USUS. AGND to set the REG5 output voltage from 0.6V to VPV5. power ground with a 1µF ceramic capacitor. 6 OUT5 Linear Regulator Power Output. OUT5 is internally pulled to AGND by 1k Ω in shutdown.

7 PG2 Power Ground for the REG2 Step-Down Regulator

8 LX2 Inductor Switching Node for REG2. LX2 is internally pulled to PG2 by 1k Ω in shutdown. charging. The battery charger is also disabled when USUS is high. output capacitors to AGND to set the output voltage from 1V to VSYS. output capacitors to AGND to set the output voltage from 0.6V to VPV4. 15 OUT4 Linear Regulator Power Output. OUT4 is internally pulled to AGND in shutdown. power ground with a 1µF ceramic capacitor.

17 BVSET

through a 50kΩ resistor to set the regulation voltage to 4.350V. 18 AGND Ground. AGND is the low-noise ground connection for the internal circuitry. output capacitors to AGND to set the output voltage from 1V to VSYS. Figure 11. Drive EN low to disable the regulators.

21 PWM

Forced-PWM Input. Connect PWM high for forced-PWM operation on REG1, REG2, and REG3.

PMIC with Integrated Charger and Smart Power Selector for Handheld Devices Pin Description (continued) PIN NAME FUNCTION 23 LX1 Inductor Switching Node for REG1. LX1 is internally pulled to PG1 by 1k Ω in shutdown.

24 PG1 Power Ground for the REG1 Step-Down Regulator

25 PG3 Power Ground for the REG3 Step-Down Regulator

26 LX3 Inductor Switching Node for REG3. LX3 is internally pulled to PG3 by 1k Ω in shutdown. 27 PV3 Power Input for the REG3 Step-Down Regulator. Connect PV3 to SYS. Bypass PV3 to PG3 with a 4.7µF ceramic capacitor. 28 VL IC Supply Output. VL is an LDO output that powers the MAX8671X internal battery-charger circuitry. VL provides 3.3V at 3mA to power external circuitry when DC or USB is present. Connect a 0.1µF capacitor from VL to AGND. 29 FB3 Feedback Input for REG3. Connect FB3 to the center of a resistor voltage-divider from the REG3 output capacitors to AGND to set the output voltage from 1V to VSYS. 30 DISET DC Input Current-Limit Select Input. Connect a resistor from DISET to AGND (RDISET) to set the DC current limit. See Table 2 for more information. 31 CISET Charge Rate Select Input. Connect a resistor from CISET to AGND (RCISET) to set the fast-charge current limit, prequalification-charge current limit, and top-off threshold. 32 CT Charge Timer Programming Node. Connect a capacitor from CT to AGND (CCT) to set the time required for a fault to occur in fast-charge or prequalification modes. Connect CT to AGND to disable the fast-charge and prequalification timers.

33 THM

Thermistor Input. Connect a negative temperature coefficient (NTC) thermistor that has a good thermal contact with the battery from THM to AGND. Connect a resistor equal to the thermistor resistance at +25°C from THM to VL. Charging is suspended when the battery is outside the hot or cold limits. 34 BAT Positive Battery Terminal Connection. Connect BAT to the positive terminal of a single-cell Li+/Li-Poly battery.

35 SYS

System Supply Output. Bypass SYS to power ground with a 10µF ceramic capacitor. When a valid voltage is present at USB or DC and not suspended (USUS = low), SYS is limited to 5.3V (VSYS-REG). When the system load (ISYS) exceeds the input current limit, SYS drops below VBAT by VBSREG allowing both the external power source and the battery service SYS. SYS is connected to BAT through an internal system load switch (RBS) when a valid source is not present at USB or DC. 36 PEN1 Input Current-Limit Control 1. See Table 1 for more information. 37 CST2 Open-Drain Charger Status Output 2. CST1 and CST2 indicate four different charger states. See Table 3 for more information. 38 UOK Active-Low, Open-Drain USB Power-OK Output. UOK is low when VUSB is within its valid operating range. 39 CST1 Open-Drain Charger Status Output 1. CST1 and CST2 indicate four different charger states. See Table 3 for more information. 40 PEN2 Input Current-Limit Control 2. See Table 1 for more information. —E P Exposed Paddle. Connect the exposed paddle to AGND. Connecting the exposed paddle does not remove the requirement for proper ground connections to AGND, PG1, PG2, and PG3.

Figure 1. MAX8671X Typical Application Circuit

Figure 2. Functional Diagram

Table 1. Input Limiter Control Logic exceeds the input current limit.

• With both an external power supply (USB or DC) and battery (BAT) connected: When the system load requirements are less than the input current limit, the battery is charged with residual power from the input. When the system load requirements exceed the input current limit, the battery supplies supple- mental current to the load through the internal sys- tem load switch.
• When the battery is connected and there is no exter- nal power input, the system (SYS) is powered from the battery.
• When an external power input is connected and there is no battery, the system (SYS) is powered from the external power input. The dual-input Smart Power Selector supports end products with dual and single external power inputs. For end products with dual external power inputs, con- nect these inputs directly to the DC and USB nodes of the MAX8671X. For end products with a single input, connect the single input to the DC node and connect USB to ground or leave it unconnected. In addition to AC-to-DC adapters current limits, the DC input also supports USB current limit to allow for end products

PMIC with Integrated Charger and Smart Power Selector for Handheld Devices with a single power input to operate from either an AC- to-DC adapter or USB host (see Table 1). A thermal-limiting circuit reduces the battery charger rate and external power-source current to prevent the MAX8671X from overheating. System Load Switch An internal 80mΩ (RBS) MOSFET connects SYS to BAT when no voltage source is available at DC or USB. When an external source is detected at DC or USB, this switch is opened and SYS is powered from the valid input source through the Smart Power Selector. When the system load requirements exceed the input current limit, the battery supplies supplemental current to the load through the internal system load switch. If the system load continuously exceeds the input current limit, the battery does not charge, even though external power is connected. This is not expected to occur in most cases because high loads usually occur only in short peaks. During these peaks, battery energy is used, but at all other times the battery charges. USB Power Input (USB) USB is a current-limited power input that supplies the system (SYS) up to 500mA. The USB to SYS switch is a linear regulator designed to operate in dropout. This lin- ear regulator prevents the SYS voltage from exceeding 5.3V. USB is typically connected to the V BUS line of the universal serial bus (USB) interface. As shown in Table 1, USB supports three different current limits that are set with the PEN2 and USUS digital inputs. These cur- rent limits are ideally suited for use with USB power. The operating voltage range for USB is 4.1V to 6.6V, but it can tolerate up to 14V without damage. When the USB input voltage is below the undervoltage threshold USBL, 4V typ) it is considered invalid. Similarly, if the USB voltage is above the overvoltage threshold USBH, 6.9V typ) it is considered invalid. When the USB voltage is below the battery voltage, it is consid- ered invalid. The USB power input is disconnected when the USB voltage is invalid. As shown in Table 1, when power is available at the DC input, it has priority over the USB input. Bypass USB to ground with at least a 4.7µF capacitor. To support USB power sources at the USB input drive PEN2 and USUS to select between three internally set USB-related current limits as shown in Table 1. Choose 100mA for low-power USB mode. Choose 500mA for high-power USB mode. Choose suspend to reduce the USB current to 0.11mA (typ) for both USB suspend mode and unconfigured OTG mode. To comply with the USB 2.0 specification, each device must be initially configured for low power. After USB enumeration, the device can switch from low power to high power if given permission from the USB host. The MAX8671X does not perform enumeration. It is expected that the system communicates with the USB host and com- mands the MAX8671X through its PEN1, PEN2, and USUS inputs. When the load exceeds the input current limit, SYS drops to 82mV below BAT and the battery supplies supplemental load current. The MAX8671X reduces the USB current limit by 5%/°C when the die temperature exceeds +100°C. The sys- tem load (I SYS) has priority over the charger current, so input current is first reduced by lowering charge cur- rent. If the junction temperature still reaches +120°C in spite of charge current reduction, no input current is drawn from USB; the battery supplies the entire load and SYS is regulated below BAT by V BSREG. Note that this on-chip thermal-limiting circuit is not related to and operates independently from the thermistor input. If the USB power input is not required, connect USB to ground or leave it unconnected. When both DC and USB inputs are powered, the DC input has priority.

remain active in USB suspend mode. remain enabled in USB suspend. 6.6V, but it can tolerate up to 14V without damage. DCL , 4V typ), it is considered invalid. DCH, 6.9V typ), it is considered invalid. Figure 3. USB Power-OK Logic

plies supplemental load current. ground or leave it unconnected. by 5%/°C when the die temperature exceeds +100°C. and operates independently from the thermistor input. Figure 4. Programming DC Current Limit Table 2. DC Current Limit for Standard

Figure 6. Li+/Li-Poly Charge Profile

CST1 and CST2 are open-drain charger status outputs. sink up to 20mA each for LED charge indicators. CST1 and CST2 to ground or leave them unconnected. Figure 7. Charger State Diagram

can control the charge time through the CEN input. qualification mode (IPQ), and the top-off threshold (ITO). Table 4. Charge Times vs. CCT

11 N o

Table 3. Charge Status Outputs that the output is high impedance. Figure 8. Programming Charge Current

capacitor to preserve charger stability. converter delivers at least 425mA. down converters control scheme. Figure 9. Monitoring the Battery Charge Current with the Table 5. Ideal Charge Currents vs.

PMIC with Integrated Charger and Smart Power Selector for Handheld Devices The MAX8671X uses external resistor-dividers to set the step-down output voltages between 1V and VSYS. Use at least 10µA of bias current in these dividers to ensure no change in the stability of the closed-loop system. To set the output voltage, select a value for the resistor con- nected between FB_ and AGND (R FBL). The recom- mended value is 100kΩ. Next, calculate the value of the resistor connected from FB_ to the output (RFBH): REG1, REG2, and REG3 are optimized for high, medi- um, and low output voltages, respectively. The highest overall efficiency occurs with V1 set to the highest out- put voltage and V3 set to the lowest output voltage. PWM The MAX8671X operates in either auto-PWM or forced- PWM modes. At light load, auto PWM switches only as needed to supply the load to improve light-load effi- ciency of the step-down converter. At higher load cur- rents (~100mA), the step-down converter transitions to fixed 2MHz switching. Forced PWM always operates with a constant 2MHz switching frequency regardless of the load. This is useful in low-noise applications. Permanently connect PWM high for forced-PWM appli- cations or low for auto-PWM applications. Do not change PWM on-the-fly. Step-Down Dropout and Minimum Duty Cycle All the step-down regulators are capable of operating in 100% duty-cycle dropout; however, REG1 has been optimized for this mode of operation. During 100% duty-cycle operation, the high-side p-channel MOSFET turns on constantly, connecting the input to the output through the inductor. The dropout voltage (V DO) is cal- culated as follows: VDO = ILOAD (RP + RL) where: RP = p-channel power switch RDS(ON) RL = external inductor ESR The minimum duty cycle for all step-down regulators is 12.5% (typ), allowing a regulation voltage as low as 1V over the full SYS operating range. REG3 is optimized for low duty-cycle operation. Step-Down Input Capacitors The input capacitor in a step-down converter reduces current peaks drawn from the power source and reduces switching noise in the controller. The imped- ance of the input capacitor at the switching frequency must be less than that of the source impedance of the supply so that high-frequency switching currents do not pass through the input source. The step-down regulator power inputs are critical dis- continuous current paths that require careful bypass- ing. In the PCB layout, place the step-down regulator input bypass capacitors as close as possible to each pair of switching regulator power input pins (PV_ to PG_) to minimize parasitic inductance. If making con- nections to these caps through vias, be sure to use multiple vias to ensure that the layout does not insert excess inductance or resistance between the bypass cap and the power pins. The input capacitor must meet the input ripple current requirement imposed by the step-down converter. Ceramic capacitors are preferred due to their low ESR and resilience to power-up surge currents. Choose the input capacitor so that its temperature rise due to input ripple current does not exceed about +10°C. For a step-down DC-DC converter, the maximum input ripple current is half of the output current. This maximum input ripple current occurs when the step-down converter operates at 50% duty factor (V IN = 2 x VOUT). Bypass each step-down regulator input with a 4.7µF ceramic capacitor from PV_ to PG_. Use capacitors that maintain their capacitance over temperature and DC bias. Ceramic capacitors with an X7R or X5R tem- perature characteristic generally perform well. The capacitor voltage rating should be 6.3V or greater. Step-Down Output Capacitors The output capacitance keeps output ripple small and ensures control loop stability. The output capacitor must have low impedance at the switching frequency. Ceramic, polymer, and tantalum capacitors are suit- able, with ceramic exhibiting the lowest ESR and lowest high-frequency impedance. The MAX8671X requires at least 20µF of output capacitance, which is best achieved with two 10µF ceramic capacitors in parallel. As the case sizes of ceramic surface-mount capacitors decrease, their capacitance vs. DC bias voltage char- acteristic becomes poor. Due to this characteristic, it is possible for 0805 capacitors to perform well while 0603 capacitors of the same value might not. The MAX8671X requires a nominal output capacitance of 20µF; howev- er, after their DC bias voltage derating, the output capacitance must be at least 15µF. RR V VFBH FBL OUT=× − ⎛ ⎝⎜ ⎞ ⎠⎟10 1.

S is the 2MHz switching frequency. Table 6. Suggested Inductors

input undervoltage lockout threshold (1.6V) are invalid. for how to enable and disable the linear regulators. tor creates a 110Hz lowpass filter for noise reduction. ply is between 1.5V and 3.3V, VL operates in dropout. voltage lockout, and also during thermal faults. pended and VL is sourcing 3mA, IUSB is 3mA. Figure 10. Step-Down Converter Maximum Output Current Example

be on either the USB or DC input for REG5 to enable.

64 CYCLE

Figure 11. Enable/Disable Logic

when both the USB and DC power inputs are removed. Figure 12. Enable and Disable Waveforms

ensure that the load circuitry powers down completely. nected from SYS, and UOK goes high impedance. operate from the battery without power at USB or DC. either the USB or DC input for REG5 to enable. Figure 13. REG5 Disable Detail

connected from SYS, and UOK goes high impedance. voltage lockout. The VL supply remains active in OVLO. or DC input for REG5 to enable. event of a thermal overload. by 5%/°C when the die temperature exceeds +100°C. absolute maximum rating of +150°C. AGND bypasses this function. Table 7. 5mm x 5mm x 0.8mm Thin QFN *θJA is specified according to the JESD51 standard.

Table 8. Trip Temperatures for Different Thermistors Figure 14. Thermistor Input

evaluation kit for Maxim’s recommended layout.

• Use short and wide traces for high-current and dis- continuous current paths.
• The step-down regulator power inputs are critical discontinuous current paths that require careful bypassing. Place the step-down regulator input bypass capacitors as close as possible to each switching regulator power input pair (PV_ to PG_).
• Minimize the area of the loops formed by the step- down converters’ dynamic switching currents.
• The exposed paddle (EP) is the main path for heat to exit the IC. Connect EP to the ground plane with thermal vias to allow heat to dissipate from the device.
• The MAX8671X regulator feedback nodes are sensi- tive high-impedance nodes. Keep these nodes as short as possible and away from the inductors.
• The thermistor node is high impedance and should be routed with care.
• Make power ground connections to a power ground plane. Make analog ground connections to an ana- log ground plane. Connect the ground planes at a single point.
• The REG4 LDO is a high-performance LDO with high PSRR and low noise and care should be used in the layout to obtain the high performance. Generally, the REG4 LDO is powered from a step- down regulator output, and therefore, its input capacitor should be bypassed to the power ground plane. However, its output capacitor should be bypassed to the analog ground plane.
• BP is a high impedance node and leakage current into or out of BP can affect the LDO output accuracy. Package Marking The top of the MAX8671X package is laser etched as shown in Figure 15:
• “8671XETL” is the product identification code. The full part number is MAX8671XETL; however, in this case, the “MAX” prefix is omitted due to space limitations.
• “yww” is a date code. “y” is the last number in the Gregorian calendar year. “ww” is the week number in the Gregorian calendar. For example: “801” is the first week of 2008; the week of January 1st, 2008 “052” is the fifty-second week of 2010; the week of December 27th, 2010. “aaaa” is an assembly code and lot code. “+” denotes lead-free packaging and marks the pin 1 location. MAX8671X PMIC with Integrated Charger and Smart Power Selector for Handheld Devices TOP VIEW THIN QFN 5mm x 5mm x 0.8mm 8671XE TLyww + aaaa

Figure 15. Package Marking Example

PMIC with Integrated Charger and Smart Power Selector for Handheld Devices MAX8671X THIN QFN 5mm x 5mm x 0.8mm TOP VIEW DC FB5 PV5 OUT5 PG2 USUS PV3 PG3 PG1 VL FB3 DISET LX1 PV1 BAT 4567 27282930 26 24 23 22 SYS PEN1 AGND BVSET PV4 OUT4 USB LX3 37CST2 BP UOK CST1 PEN2 FB4 DOK FB2 THM FB1CT 20 EN LX2 PV2 CEN PWM 89 1 0 CISET EXPOSED PADDLE (EP) Pin Configuration

MAX8671XPackage Information (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline info rmation go to www.maxim-ic.com/packages.) QFN THIN.EPS PMIC with Integrated Charger and Smart Power Selector for Handheld Devices

PMIC with Integrated Charger and Smart Power Selector for Handheld Devices Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circu it patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 44 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2007 Maxim Integrated Products is a registered trademark of Maxim Integrated Products. Inc. Package Information (continued) (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline info rmation go to www.maxim-ic.com/packages.)