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Rev. AFor more information www.analog.com Document Feedback TYPICAL APPLICATION FEATURES DESCRIPTION Multioutput Power Management Solution with Four Buck Switching and Thr ee LDO Linear Regulators The LT®3383 is a complete power management solution for advanced portable application processor-based sys - tems. The device contains four synchronous step-down DC/DC converters for core, memory, I/O, and system on- chip (SoC) rails and three 300mA LDO regulators for low noise analog supplies. Regulator start-up is sequenced by connecting outputs to enable pins in the desired order . A master power-on pin is provided to initiate pin-strapped power-on sequences. A status pin is available to indicate regulator undervoltages. If an overtemperature or low supply fault is detected all regulators are disabled during the fault condition. The device is available in a 40-lead 6mm × 6mm QFN with wettable flanks for optical inspection. Start-Up Sequence
APPLICATIONS
n Quad Adjustable High Efficiency Step-Down DC/DC Converters: 2.5A, 2.5A, 1.5A, 1.5A n Three 300mA LDO Regulators (T wo Adjustable) n Independent Enable Pin-Strap Sequencing n Power Good n 2.25MHz Switching Frequency n 12µA Standby Current n 150°C TJ Operation (LT3383H) n Side Wettable 40-Lead 6mm × 6mm QFN Package n Automotive n Industrial n Communications n General Purpose Multichannel Power Supplies All registered trademarks and trademarks are the property of their respective owners. 1µF 1.8V 300mA 1.8V TO VIN 1µF 300mA 1.7V TO VIN 1.7V TO VIN 1µF 47µF300mA 2.5A LDO1 LDO2 LDO3 FB_L1 FB_B1 FB_L2 SW1 L T3383 2.7V TO 5.5V VIN VIN_L1 VIN_L2 VIN_L3 1µH
3383 TA01a
PWR_ON PGOOD 47µF 2.5A FB_B2 SW2 1µH 47µF 1.5A FB_B3 SW3 1µH 47µF 1.5A FB_B4 SW4 1µH PWR_ON 1ms/DIV LDO2
3383 TA01b
Rev. A For more information www.analog.com PIN CONFIGURATIONABSOLUTE MAXIMUM RATINGS LDO1, FB_L1, LDO2, FB_L2, LDO3, FB_B1, FB_B2, FB_B3, FB_B4, PGOOD, EN_B1, EN_B2, EN_B3, EN_B4, 3V to 6V Operating Junction Temperature Range C to 150°C C to 150°C (Note 1) 3940 38 37 36 35 34 33 32 31 11 2012 13 14 15 TOP VIEW GND UJM PACKAGE 40-LEAD (6mm × 6mm) WETTABLE PLASTIC QFN TJMAX = 150°C, θJA = 33°C/W, θJC = 2°C/W EXPOSED PAD (PIN 41) IS GND, MUST BE SOLDERED TO PCB 16 17 18 19 FB_L2 VIN_L2 LDO2 LDO3 VIN_L3 LDO1 VIN_L1 FB_L1 EN_L1 EN_L3 EN_L2 GND GND V IN GND FB_B3 FB_B4 FB_B1 FB_B2 PWR_ON SW4 PGOOD GND EN_B4 PV IN4 PVIN3 EN_B3 GND GND SW3 SW1 GND GND GND PV IN1 PVIN2 EN_B1 EN_B2 GND SW2 LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LT3383EUJM#PBF LT3383EUJM#TRPBF LT3383UJM 40-Lead (6mm 6mm) Plastic QFN –40°C to 125°C LT3383IUJM#PBF LT3383IUJM#TRPBF LT3383UJM 40-Lead (6mm 6mm) Plastic QFN –40°C to 125°C LT3383HUJM#PBF LT3383HUJM#TRPBF LT3383UJM 40-Lead (6mm 6mm) Plastic QFN –40°C to 150°C AUTOMOTIVE PRODUCTS** LT3383IUJM#WPBF LT3383IUJM#WTRPBF LT3383UJM 40-Lead (6mm 6mm) Plastic QFN –40°C to 125°C LT3383HUJM#WPBF LT3383HUJM#WTRPBF LT3383UJM 40-Lead (6mm 6mm) Plastic QFN –40°C to 150°C Contact the factory for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container . Tape and reel specifications. Some packages are available in 500 unit reels through designated sales channels with #TRMPBF suffix. **Versions of this part are available with controlled manufacturing to support the quality and reliability requirements of automotive applications. These models are designated with a #W suffix. Only the automotive grade products shown are available for use in automotive applications. Contact your local Analog Devices account representative for specific product ordering information and to obtain the specific Automotive Reliability reports for these models. ORDER INFORMATION
Rev. AFor more information www.analog.com ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the specified operating junction temperature range, otherwise specifications are at TA = 25°C (Note 2). VIN = PVIN1 = PVIN2 = PVIN3 = PVIN4 = VIN_L1 = VIN_L2 = VIN_L3 = 3.8V. All regulators disabled unless otherwise noted. PARAMETER CONDITIONS MIN TYP MAX UNITS Operating Input Supply Voltage, VIN l 2.7 5.5 V VIN Standby Current PWR_ON = 0V l 12 21 µA VIN Undervoltage Fault Rising (Note 7) VIN Undervoltage Fault Falling l l 2.35 2.55 2.45 2.65 V V Step-Down Switching Regulators 1, 2, 3 and 4 Output Voltage Range l VFB PVIN V VIN Quiescent Current FB_Bx = 850mV (Note 5) l 120 200 µA Feedback Regulation Voltage (VFB) l 714 725 736 mV Feedback Pin Input Current FB_Bx = 850mV –0.05 0.05 µA Maximum Duty Cycle FB_Bx = 0V l 100 % Minimum Duty Cycle l 18 24 % SW Pull-Down Resistance Regulator Disabled 625 Ω Feedback Reference Soft-Start Rate (Note 6) 0.8 V/ms Switching Frequency l 1.7 2.25 2.7 MHz 1.5A Step-Down Switching Regulators 3 and 4 PMOS Current Limit l 2.0 A PMOS On-Resistance 160 mΩ NMOS On-Resistance 80 mΩ 2.5A Step-Down Switching Regulators 1 and 2 PMOS Current Limit l 3.0 A PMOS On-Resistance 120 mΩ NMOS On-Resistance 70 mΩ LDO Regulators 1, 2 and 3 Feedback Reference Soft-Start Rate 10 V/ms Output Pull-Down Resistance Regulator Disabled 625 Ω LDO Regulators 1 and 2 V IN_Lx Input Voltage l 1.7 VIN V Output Voltage Range ILDO = 0mA VFB_Lx VIN_Lx V Available Output Current l 300 mA VIN_Lx Quiescent Current VIN_Lx Shutdown Current Regulator Enabled, ILDO = 0A Regulator Disabled l l µA µA VIN Quiescent Current Regulator Enabled l 50 85 µA Feedback Regulation Voltage l 0.707 0.725 0.743 V Line Regulation ILDO = 1mA, VIN = 2.7V to 5.5V 0.01 %/V Load Regulation ILDO = 1mA to 300mA 0.01 % Short-Circuit Current Limit 770 mA Dropout Voltage (Note 4) ILDO = 300mA, VLDO = 2.5V ILDO = 300mA, VLDO = 1.2V 210 450 260 615 mV mV Feedback Pin Input Current FB_Lx = 725mV –0.05 0.05 µA LDO Regulator 3 VIN_L3 Input Voltage l 2.35 VIN V Output Voltage ILDO = 1mA l 1.746 1.8 1.854 V Available Output Current l 300 mA
Rev. A For more information www.analog.com ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the specified operating junction temperature range, otherwise specifications are at TA = 25°C (Note 2). VIN = PVIN1 = PVIN2 = PVIN3 = PVIN4 = VIN_L1 = VIN_L2 = VIN_L3 = 3.8V. All regulators disabled unless otherwise noted. PARAMETER CONDITIONS MIN TYP MAX UNITS VIN_L3 Quiescent Current VIN_L3 Shutdown Current Regulator Enabled, ILDO = 0A Regulator Disabled l l µA µA VIN Quiescent Current Regulator Enabled l 50 85 µA Line Regulation ILDO =1mA, VIN = 2.7V to 5.5V 0.01 %/V Load Regulation ILDO = 1mA to 300mA 0.05 % Short-Circuit Current Limit 770 mA Dropout Voltage (Note 4) ILDO = 300mA, VLDO3 = 1.8V 280 350 mV Enable Inputs Threshold Rising All Enables Low l 0.75 1.2 V Threshold Falling One Enable High l 0.4 0.7 V Precision Threshold One or More Regulators Previously Enabled l 0.370 0.400 0.430 V Input Pull-Down Resistance 4.5 MΩ PWR_ON Threshold l 0.370 0.400 0.430 V Pull-Down Resistance 4.5 MΩ PWR_ON High to Allow Enables Delay 3 ms PWR_ON High to Inhibit Enables Delay 3 ms PGOOD PGOOD Output Low Voltage I PGOOD = 3mA 0.1 0.4 V PGOOD Output High Leakage Current VPGOOD = 3.8V –0.1 0.1 µA PGOOD Threshold Rising PGOOD Threshold Falling Note 1: Stresses beyond those listed Under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum rating condition for extended periods may affect device reliability and lifetime. Note 2: The LT3383 is tested under pulsed load conditions such that T J ≈ TA. The LT3383E is guaranteed to meet specifications from 0°C to 85°C junction temperature. Specifications over the –40°C to 125°C operating junction temperature range are assured by design, characterization and correlation with statistical process controls. The LT3383I is guaranteed over the –40°C to 125°C operating junction temperature range and the LT3383H is guaranteed over the full –40°C to 150°C operating junction temperature range. High junction temperatures degrade operating lifetimes; operating lifetime is derated for junction temperatures greater than 125°C. The junction temperature (T J in °C) is calculated from the ambient temperature (TA in °C) and power dissipation (PD, in Watts), and package to junction ambient thermal impedance (JA in Watts/°C ) according to the formula: TJ = TA + (PD • JA). Note that the maximum ambient temperature consistent with these specifications is determined by specific operating conditions in conjunction with board layout, the rated package thermal impedance and other environmental factors. Note 3: The LT3383 includes overtemperature protection that is intended to protect the device during momentary overload conditions. Junction temperature will exceed 150°C when overtemperature protection is active. Continuous operation above the specified maximum operating junction temperature may impair device reliability. Note 4: Dropout voltage is defined as (V IN_Lx – VLDOx) when VLDOx is 3% lower than VLDOx measured with VIN = VIN_Lx = 4.3V. Note 5: Dynamic supply current is higher due to the gate charge being delivered at the switching frequency. Note 6: Soft-Start measured in test mode with regulator error amplifier in unity-gain mode. Note 7: The LT3383 will operate before VIN has risen higher than VIN undervoltage fault rising (2.65V max) but will shutdown if VIN does not cross the rising threshold in less than 5 seconds. Please refer to the Operation section.
Rev. AFor more information www.analog.com TYPICAL PERFORMANCE CHARACTERISTICS Standby IVIN vs VIN LDO1 to LDO3 IVIN vs VIN Step-Down Switching Regulator IVIN vs VIN VIN (V) 2.5 IVIN (µA)8
3383 G01
5.5 VIN (V) 2.5 IVIN (µA) 100 300 400 500 4.5 900
3383 G03
800 ENABLE FOUR BUCKS
V IN = 3.8V, TA = 25°C unless otherwise noted VIN (V) 2.50 IVIN (µA) 100 150
3383 G02
3.50 4.50 5.50 250 200 ENABLE 3 LDOs ENABLE 2 LDOs ENABLE 1 LDO TEMPERATURE (°C) –50 IVIN (µA) 200 400 600 800 1000 1200 0 50 STANDBY 100 150
3383 G04
TEMPERATURE (°C) –50
2.00 FREQUENCY (MHz)
2.05 2.10 2.15 2.20 2.25 2.30 0 50 100 150
3383 G05
Oscillator Frequency Change vs VIN VIN (V) 2.5 PERCENT CHANGE (%)
3383 G06
–0.4 –0.8 0.4 0.8 –0.2 –0.6 0.2 0.6 5.5
Rev. A For more information www.analog.com TYPICAL PERFORMANCE CHARACTERISTICSVIN = 3.8V, TA = 25°C unless otherwise noted Step-Down Switching Regulators 3 and 4 Efficiency vs IOUT Step-Down Switching Regulators 3 and 4 Efficiency vs I OUT IOUT (mA) EFFICIENCY (%) 10 100
3383 G07
VIN = 3.3V VOUT = 1.2V IOUT (mA) EFFICIENCY (%) 10 100
3383 G08
VIN = 5V VOUT = 1.2V Step-Down Switching Regulators 1 and 2 Efficiency vs IOUT Buck RDS(ON) vs Temperature Buck RDS(ON) vs VIN IOUT (mA) EFFICIENCY (%) VOUT = 2.5V 10 100
3383 G09
VIN = 3.3V VOUT = 1.2V TEMPERATURE (°C) –50 RDS(ON) (m/uni03A9) 100 150 150
3383 G10
BUCK 3, 4 PMOS BUCK 3, 4 NMOS BUCK 1, 2 NMOS BUCK 1, 2 PMOS VIN (V) 2.5 RDS(ON) (m/uni03A9) 100 200 140 3.5 4.5
3383 G11
5.5 BUCK 3, 4 PMOS BUCK 1, 2 PMOS BUCK 1, 2 NMOS BUCK 3, 4 NMOS Step-Down Switching Regulator Current Limit vs Temperature TEMPERATURE (°C) –50 1.5 CURRENT (A) 2.0 2.5 3.0 3.5 4.0 4.5 0 50 100 150
3383 G12
BUCK 1, 2 BUCK 3, 4
Rev. AFor more information www.analog.com VIN = 3.8V, TA = 25°C unless otherwise notedTYPICAL PERFORMANCE CHARACTERISTICS Step-Down Switching Regulator Load Step 100mV/DIV 500mA/DIV 10µs/DIVCOUT = 47µF 3383 G13 VOUT = 1.2V ILOAD = 0.5A TO 1.5A LDO1 to LDO3 Load Step Response LDO1 to LDO3 Dropout Voltage vs Temperature LDO1 to LDO3 Short-Circuit Current vs Temperature 50mV/DIV VLDO = 1.8V ILOAD = 220mA 10mA 100mA/DIV 10µs/DIVCLDO = 1µF 3383 G18 TEMPERATURE (°C) –50 DROPOUT VOLTAGE (mV) 250 300 350 150
3383 G16
VLDO = 1.2V VLDO = 1.8V VLDO = 3.3V 400 ILDO = 200mA TEMPERATURE (°C) –50
300 LDO SHORT-CIRCUIT CURRENT (mA)350
3383 G17
Buck Minimum Duty Cycle vs VIN Buck Minimum Duty Cycle vs Temperature TEMPERATURE (°C) –50 100 150 DUTY CYCLE (%)
3383 G14
V = 3.8V IN V = 5.0V IN VIN (V) 2.5 3.5 4.5 5.5 DUTY CYCLE (%)
3383 G15
Rev. A For more information www.analog.com PIN FUNCTIONS FB_L2 (Pin 1): Feedback Input for LDO2. Set output volt- age using a resistor divider connected from LDO2 to this pin to ground. VIN_L2 (Pin 2): Power Input for LDO2. This pin should be bypassed to ground with a 1μF or greater ceramic capacitor . Voltage on VIN_L2 should not exceed voltage on VIN pin. LDO2 (Pin 3): Output Voltage of LDO2. Nominal output voltage is set with a resistor feedback divider that servos to a fixed 725mV reference. This pin must be bypassed to ground with a 1µF or greater ceramic capacitor . LDO3 (Pin 4): Output Voltage of LDO3. Nominal output voltage is a fixed 1.8V. This pin must be bypassed to ground with a 1µF or greater ceramic capacitor . VIN_L3 (Pin 5): Power Input for LDO3. This pin should be bypassed to ground with a 1µF or greater ceramic capacitor . Voltage on VIN_L3 should not exceed voltage on VIN pin. LDO1 (Pin 6): Output Voltage of LDO1. Nominal output voltage is set with a resistor feedback divider that servos to a fixed 725mV reference. This pin must be bypassed to ground with a 1µF or greater ceramic capacitor . VIN_L1 (Pin 7): Power Input for LDO1. This pin should be bypassed to ground with a 1μF or greater ceramic capacitor . Voltage on VIN_L1 should not exceed voltage on VIN pin. FB_L1 (Pin 8): Feedback Input for LDO1. Set output volt- age using a resistor divider connected from LDO1 to this pin to ground. EN_L1 (Pin 9): Enable LDO1 Input. Active high enables LDO1. A weak pull-down pulls EN_ L1 low when left floating. EN_L3 (Pin 10): Enable LDO3 Input. Active high enables LDO3. A weak pull-down pulls EN_ L3 low when left floating. SW1 (Pin 11): Switch Pin for Step-Down Switching Regulator 1. Connect one side of step-down switching regulator 1 inductor to this pin. GND (Pin 12): Ground GND (Pin 13): Ground GND (Pin 14): Ground PVIN1 (Pin 15): Power Input for Step-Down Switching Regulator 1. Tie this pin to V IN supply. This pin should be bypassed to ground with a 10μF or greater ceramic capacitor . PVIN2 (Pin 16): Power Input for Step-Down Switching Regulator 2. Tie this pin to the VIN supply. This pin should be bypassed to ground with a 10μF or greater ceramic capacitor . EN_B1 (Pin 17): Enable Step-Down Switching Regulator 1. Active high input enables step-down switching regulator 1. A weak pull-down pulls EN_B1 low when left floating. EN_B2 (Pin 18): Enable Step-Down Switching Regulator 2. Active high input enables step-down switching regulator 2. A weak pull-down pulls EN_B2 low when left floating. GND (Pin 19): Ground. SW2 (Pin 20): Switch Pin for Step-Down Switching Regulator 2. Connect one side of step-down switching regulator 2 inductor to this pin. PWR_ON (Pin 21): Power On. PWR_ON is a master enable and disable input. When low, PWR_ON inhibits the regulator enable pins. When high, PWR_ON allows enable pin operation. FB_B2 (Pin 22): Feedback Input for Step-Down Switching Regulator 2. Set output voltage using resistor divider con- nected from the output of step-down switching regulator 2 to this pin to ground. FB_B1 (Pin 23): Feedback Input for Step-Down Switching Regulator 1. Set output voltage using resistor divider con- nected from the output of step-down switching regulator 1 to this pin to ground. FB_B4 (Pin 24): Feedback Input for Step-Down Switching Regulator 4. Set output voltage using resistor divider con- nected from the output of step-down switching regulator 4 to this pin to ground.
Rev. AFor more information www.analog.com PIN FUNCTIONS FB_B3 (Pin 25): Feedback Input for Step-Down Switching Regulator 3. Set output voltage using resistor divider con- nected from the output of step-down switching regulator 3 to this pin to ground. GND (Pin 26): Ground. VIN (Pin 27): Supply Voltage Input. This pin should be bypassed to ground with a 1μF or greater ceramic capaci- tor . All switching regulator PVIN supplies should be tied to VIN. GND (Pin 28): Ground. GND (Pin 29): Ground. EN_L2 (Pin 30): Enable LDO2 Input. Active high enables LDO2. A weak pull-down pulls EN_ L2 low when left floating. SW3 (Pin 31): Switch Pin for Step-Down Switching Regulator 3. Connect one side of step-down switching regulator 3 inductor to this pin. GND (Pin 32): Ground. GND (Pin 33): Ground. EN_B3 (Pin 34): Enable Step-Down Switching Regulator 3. Active high input enables step-down switching regulator 3. A weak pull-down pulls EN_B3 low when left floating. PVIN3 (Pin 35): Power Input for Step-Down Switching Regulator 3. Tie this pin to V IN supply. This pin should be bypassed to ground with a 10μF or greater ceramic capacitor . PVIN4 (Pin 36): Power Input for Step-Down Switching Regulator 4. Tie this pin to V IN supply. This pin should be bypassed to ground with a 10μF or greater ceramic capacitor . EN_B4 (Pin 37): Enable Step-Down Switching Regulator 4. Active high enables step-down switching regulator 4. A week pull-down pulls EN_B4 low when left floating. GND (Pin 38): Ground. PGOOD (Pin 39): Power Good Output. Open-drain output pulls low when any enabled regulator falls below power good threshold. Pulls low when all regulators are disabled. SW4 (Pin 40): Switch Pin for Step-Down Switching Regulator 4. Connect one side of step-down switching regulator 4 inductor to this pin. GND (Exposed Pad Pin 41): Ground. The exposed pad must be connected to a continuous ground plane of the printed circuit board by multiple interconnect vias directly under the LT3383 to maximize electrical and thermal conduction.
Rev. A For more information www.analog.com BLOCK DIAGRAM BUCK1 VREF EN OK PVIN1 SW1 FB_B1 LDO1 VREF EN OK VIN_L1 VIN LDO1 FB_L1 BUCK2 VREF EN OK PVIN2 SW2 FB_B2 BUCK3 VREF EN OK PV IN3 SW3 FB_B3 BUCK4 VREF EN OK PV IN4 SW4 FB_B4 GND (EXPOSED PAD) 3383 BD FAUL T DETECTION UNDER VOL TAGE OVER TEMPERATURE PGOOD PRECISION ENABLE THRESHOLD AND SEQUENCE DELAY PWR_ON EN_B1 EN_B2 EN_B3 EN_B4 EN_L2 EN_L3 EN_L1 LDO3 VREF EN OK VIN_L3 LDO3 LDO2 VREF EN 725mV OK VIN_L2 LDO2 FB_L2
age regulator . It generates a total of seven voltage rails. is a highly configurable power-on sequencing capability. and VIN_L3 must be at a potential of VIN or less. current and the other two can deliver up to 1.5A each. loads but operates at constant frequency at higher loads. Figure 1. LDO1 and LDO2 Application Circuit Figure 2. Step-Down Switching Regulator Application Circuit
3383 F01
3383 F03
Typical values for R1 are in the range of 40k to 1M. the peak current is closer to the average output current. gives ripple equal to 30% of the maximum output current. ship between PWR_ON and inhibition of the enable pins. 0.75V (typical) input voltage threshold. Figure 3. Power-Up and Down with PWR_ON
up timing of the example shown in Figure 4. Figure 4. Pin-Strapped Power-On Sequence Application Figure 5. Pin-Strapped Power-On Sequence Figure 6. Output Low Voltage PGOOD Timing
3383 F04
3383 F05
all outputs until VIN rises above UVLO rising threshold. voltage at which VIN rising undervoltage fault is detected. may be used to ensure VIN is above 2.7V. temperature falls below the overtemperature threshold.
3383 F06
100 W( )
temperature of 118°C at an ambient temperature of 55°C. the switching regulators at three-quarters rated current. Table 1. LT3383 Power Loss Example
- Connect the exposed pad of the package (Pin 41)
- The switching regulator input supply traces to their
decoupling capacitors should be as short as possible. from the capacitors to the LT3383 pins.
- Minimize the switching power traces connecting SW1,
the large voltage swings on the switching nodes.
- Minimize the length of the connection between the
Rev. AFor more information www.analog.com TYPICAL APPLICATIONS LT3383 Seven Power Rails VIN 3.5V TO 5V 10pF 22µF 22µF 22µF 22µF 1M 47µF 1.5µH 1µF BUCK3 2.48V 1.5A 412k 10pF 1.07M 47µF 0.82µH 10pF 649k 47µF 0.82µH BUCK2 1.5V 2.5A BUCK4 1.81V 1.5A 10pF 1µF 1M 47µF 1.5µH LDO1 1.2V 300mA BUCK1 1.2V 2.5A 665k SW3VIN PWR_ON EN_B1 EN_B2 EN_B3 EN_B4 EN_L2 EN_L3 EN_L1 FB_B3 SW2 FB_B2 SW1 FB_B1 SW4 FB_B4 649k LDO1 FB_L1 1µF LDO3 1µF LDO2 0.8V 300mA LDO3 1.8V 300mA 102k
3383 TA02
FB_L2 GND L T3383 VIN_L1 1µF VIN_L3 1µF VIN_L2 PVIN4PVIN3PVIN2PVIN1 PGOODPGOOD 1µF PWR_ON SEQUENCE: BUCK2 BUCK3 LDO2 LDO1 LDO3 BUCK1 BUCK4 BUCK1 BUCK2 LDO2 PWR_ON
Rev. A For more information www.analog.com PACKAGE DESCRIPTION 6.00 ±0.10 (4 SIDES) NOTE: 1. DRAWING NOT TO SCALE 2. ALL DIMENSIONS ARE IN MILLIMETERS 3. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.20mm ON ANY SIDE, IF PRESENT 4. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION ON THE TOP AND BOTTOM OF PACKAGE PIN 1 TOP MARK (SEE NOTE 4) PIN 1 NOTCH R = 0.45 OR 0.35 × 45° CHAMFER 0.40 ±0.10 40 39 BOTTOM VIEW—EXPOSED PAD
4.50 REF
(4-SIDES) 4.10 ±0.10 4.10 ±0.10 4.10 ±0.05 4.10 ±0.05 0.75 ±0.05 R = 0.115 TYP 0.25 ±0.05
0.50 BSC
0.200 REF
0.00 – 0.05 (UJM40) QFN REV Ø 1218 RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS APPLY SOLDER MASK TO AREAS THAT ARE NOT SOLDERED 0.70 ±0.05 4.50 ±0.05 (4 SIDES) 5.10 ±0.05 6.50 ±0.05 0.25 ±0.05 R = 0.10 TYP 40-Lead Plastic Side Wettable QFN (6mm × 6mm) (Reference LTC DWG # 05-08-1681 Rev Ø)
0.203 REF
0.40 ± 0.10
0.05 REF
0.10 REF
Rev. AFor more information www.analog.com Information furnished by Analog Devices is believed to be accurate and reliable. However , no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
REVISION HISTORY
REV DATE DESCRIPTION PAGE NUMBER A 09/21 Add Ordering Information for Automotive Products. 2
Rev. A For more information www.analog.com ANALOG DEVICES, INC. 2020-2021 www.analog.com RELATED PARTS TYPICAL APPLICATION PART NUMBER DESCRIPTION COMMENTS LTC3676/ LTC3676-1 PMIC for Application Processors Quad I 2C Adjustable High Efficiency Step-Down DC/DC Converters: 2.5A, 2.5A, 15A, 1.5A, Three 300mA LDO Regulators (T wo Adjustable), DDR Power Solutions with VTT and VTTR Reference, Pushbutton ON/ OFF Control, LTC3676-1 Supports DDR, 40-Lead 6mm × 6mm × 0.75mm QFN Package. LTC3375 8-Channel Programmable, Parallelable 1A Buck DC/DCs 8-Channel Independent Step-Down DC/DCs. Master Slave Configurable for Up to 4A per Output Channel with a Single Inductor , Die Temperature Monitor Output, 48-Lead 7mm 7mm QFN Package. LTC3589/ LTC3589-1/ LTC3589-2 8-Output Regulator with Sequencing and I T riple I2C Adjustable High Efficiency Step-Down DC/DC Converters: 1.6A, 1A, 1A. High Efficiency 1.2A Buck-Boost DC/DC Converter . T riple 250mA LDO Regulators. Pushbutton ON/OFF Control with System Reset. Flexible Pin-Strap Sequencing Operation. I 2C and Independent Enable Control Pins, DVS and Slew Rate Control, 40-Lead 6mm 6mm 0.75mm QFN Package. LTC3586/ LTC3586-1 Switching USB Power Manager PMIC with Li-Ion/Polymer Charger Complete Multifunction PMIC: Switching Power Manager , 1A Buck-Boost + 2 Bucks + Boost + LDO, 4mm 6mm QFN-38 Package, LTC3586-1 Version Has 4.1V V FLOAT. Seven Sequenced Power Rails From 40V Input Using LT8609-5 VIN 6V TO 40V 10pF 22µF 22µF 22µF 22µF 294k 47µF 1µH 1µF V5PO 47µF 0.1µF 100k 10nF BUCK4 1.8V 1.5A 200k 10pF 130k 47µF 1µH 200k 10pF 178k 47µF 1µH BUCK2 1.2V 2.5A 200k 1µF LDO3 1.8V 300mA BUCK1 1.37V 2.5A 10pF 715k 47µF 1µH 200k BUCK3 3.3V 1.5A SW4VIN PWR_ON VIN EN/UV SYNC INTVCC TR/SS RT GND BST SW L T8609-5 VOUT PG FB_B4 SW2 FB_B2 SW1 FB_B1 FB_B3 FB_L1 SW3 130k 1µF LDO1 1.2V 300mA 200k LDO3 LDO1 1µF LDO2 3.3V 300mA 715k 200k FB_L2 GND L T3383 VIN_L3 1µF VIN_L2 PVIN4PVIN3PVIN2PVIN1 PGOODPGOOD 1µF VIN_L1 1µF 2.2µH EN_B1 EN_B2 EN_B3 EN_B4 EN_L1 EN_L2 EN_L3 BUCK4 BUCK2 BUCK1 BUCK1 18.2k 1µF ON OFF4.7µF PMIC_OFFPMIC_ON BUCK2 BUCK1 BUCK4 LDO1 SEQUENCE: PMIC_ON BUCK3 LDO3