LTC3025

LTC3025 LINER | Alldatasheet

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Technical content

FEATURES

APPLICATIONS

DESCRIPTION

The L TC®3025 is a micropower , VLDOTM (very low drop- out) linear regulator which operates from input voltages as low as 0.9V . The device is capable of supplying 300mA of output current with a typical dropout voltage of only 45mV . A BIAS supply is required to run the internal reference and LDO circuitry while output current comes directly from the IN supply for high effi ciency regulation. The low 0.4V internal reference voltage allows the L TC3025 output to be programmed to much lower voltages than available in common LDOs (range of 0.4V to 3.6V). The output voltage is programmed via two ultrasmall SMD resistors. The L TC3025’s low quiescent current makes it an ideal choice for use in battery-powered systems. For 3-cell NiMH and single cell Li-Ion applications, the BIAS voltage can be supplied directly from the battery while the input can come from a high effi ciency buck regulator , providing a high effi ciency, low noise output. Other features include high output voltage accuracy, excellent transient response, stability with ultralow ESR ceramic capacitors as small as 1μF , short-circuit and thermal overload protection and output current limiting. The L TC3025 is available in a tiny, low profi le (0.75mm) 6-lead DFN (2mm × 2mm) package. 1.2V Output Voltage from 1.5V Input Supply n Wide Input Voltage Range: 0.9V to 5.5V n Stable with Ceramic Capacitors n Very Low Dropout: 45mV at 300mA n Adjustable Output Range: 0.4V to 3.6V n ±2% Voltage Accuracy over Temperature Supply Load n Low Noise: 80μV RMS (10Hz to 100kHz) n BIAS Voltage Range: 2.5V to 5.5V n Fast T ransient Recovery n Shutdown Disconnects Load from V IN and VBIAS n Low Operating Current: I IN = 4μA, IBIAS = 50μA Typ n Low Shutdown Current: I IN = 1μA, IBIAS = 0.01μA Typ n Output Current Limit n Thermal Overload Protection n Available in 6-Lead (2mm × 2mm) DFN Package n Low Power Handheld Devices n Low Voltage Logic Supplies n DSP Power Supplies n Cellular Phones n Portable Electronic Equipment n Handheld Medical Instruments n Post Regulator for Switching Supply Noise Rejection 1MHz VIN Supply Rejection L TC3025 BIAS 0.1μF 1.5V 1μF 0.1μF Li-Ion OR 3-CELL NiMH IN SHDN OUT 80.6k VOUT = 1.2V IOUT ≤ 300mA 40.2k

3025 TA01

1.5V HIGH EFFICIENCY DC/DC BUCK VIN (V) 1.2 REJECTION (dB) 1.6 2.0 2.2

3025 TA01b

1.4 1.8 2.4 2.6 BIAS = 3.6V VOUT = 1.2V IOUT = 100mA IOUT = 300mA COUT = 1μF COUT = 10μF L, L T , L TC and L TM are registered trademarks of Linear Technology Corporation. VLDO is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners.

PIN CONFIGURATION ABSOLUTE MAXIMUM RATINGS V Operating Junction Temperature Range (Notes 1, 2) TOP VIEW DC6 PACKAGE 6-LEAD (2mm s 2mm) PLASTIC DFN

1 BIAS

TJMAX = 125°C, θJA = 102°C/W , θJC = 20°C/W EXPOSED PAD (PIN 7) IS GND, MUST BE SOLDERED TO PCB ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE L TC3025EDC#PBF L TC3025EDC#TRPBF LBDY 6-Lead (2mm × 2mm) Plastic DFN –40°C to 125°C L TC3025IDC#PBF L TC3025IDC#TRPBF LBDY 6-Lead (2mm × 2mm) Plastic DFN –40°C to 125°C LEAD BASED FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE L TC3025EDC L TC3025EDC#TR LBDY 6-Lead (2mm × 2mm) Plastic DFN –40°C to 125°C L TC3025IDC L TC3025IDC#TR LBDY 6-Lead (2mm × 2mm) Plastic DFN –40°C to 125°C Consult L TC Marketing for parts specifi ed with wider operating temperature ranges. *The temperature grade is identifi ed by a label on the shipping container . For more information on lead free part marking, go to: http://www.linear .com/leadfree/ For more information on tape and reel specifi cations, go to: http://www.linear .com/tapeandreel/ PARAMETER CONDITIONS MIN TYP MAX UNITS VIN Operating Voltage (Note 4) l 0.9 5.5 V VBIAS Operating Voltage (Note 4) l 2.5 5.5 V VBIAS Undervoltage Lockout l 2.2 2.5 V VIN Operating Current IOUT = 10μA l 41 0 μ A VBIAS Operating Current IOUT = 10μA l 50 80 μA VIN Shutdown Current VSHDN = 0V 1 5 μA VBIAS Shutdown Current VSHDN = 0V 0.01 1 μA VADJ Regulation Voltage (Note 5) 1mA ≤ IOUT ≤ 300mA, 1.5V ≤ VIN ≤ 5V 1mA ≤ IOUT ≤ 300mA, 1.5V ≤ VIN ≤ 5V l 0.395 0.392 0.4 0.4 0.405 0.408 V V I ADJ ADJ Input Current VADJ = 0.45V –50 0 50 nA OUT Load Regulation (Referred to ADJ Pin) ΔIOUT = 1mA to 300mA –0.2 mV VIN Line Regulation (Referred to ADJ Pin) V IN = 1.5V to 5V , VBIAS = 3.6V , VOUT = 1.2V , IOUT = 1mA 0.07 mV The l denotes the specifi cations which apply over the full operating CBIAS = 0.1μF (all capacitors ceramic) unless otherwise noted.

ELECTRICAL CHARACTERISTICS

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: This IC includes overtemperature protection that is intended to protect the device during momentary overload conditions. Junction temperature will exceed 125°C when overtemperature protection is active. Continuous operation above the specifi ed maximum operating junction temperature may impair device reliability. Note 3: The L TC3025 regulator is tested and specifi ed under pulse loadconditions such that T J ≈ TA. The L TC3025 is 100% production tested at 25°C. Performance at –40°C and 125°C is assured by design, characterization and correlation with statistical process control. The L TC3025I is guaranteed to meet performance specifi cations over the full –40°C and 125°C temperature range. The l denotes the specifi cations which apply over the full operating CBIAS = 0.1μF (all capacitors ceramic) unless otherwise noted. PARAMETER CONDITIONS MIN TYP MAX UNITS BIAS Line Regulation (Referred to ADJ Pin) V IN = 1.5V , VBIAS = 2.6V to 5V , VOUT = 1.2V IOUT = 1mA l 1.7 5.5 mV VIN to VOUT Dropout Voltage (Notes 4, 6, 7) V BIAS = 2.8V , VIN = 1.5V , VADJ = 0.37V , IOUT = 300mA l 45 100 mV VBIAS to VOUT Dropout Voltage (Note 4) l 1.4 V IOUT Continuous Output Current l 300 mA IOUT Current Limit V ADJ = 0V 680 mA en Output Voltage Noise f = 10Hz to 100kHz, I OUT = 300mA 80 μV RMS VIH SHDN Input High Voltage l 0.9 V VIL SHDN Input Low Voltage l 0.3 V IIH SHDN Input High Current SHDN = 1.2V –1 1 μA IL SHDN Input Low Current SHDN = 0V –1 1 μA Note 4: For the L TC3025, a regulated output voltage will only be available when the minimum IN and BIAS Operating Voltages as well as the IN to OUT and BIAS to OUT Dropout Voltages are all satisfi ed. Note 5: Operating conditions are limited by maximum junction temperature. The regulated output voltage specifi cation will not apply for all possible combinations of input voltage and output current. When operating at maximum input voltage, the output current range must be limited. When operating at maximum output current, the input voltage range must be limited. Note 6: Dropout voltage is minimum input to output voltage differential needed to maintain regulation at a specifi ed output current. In dropout, the output voltage will be equal to V IN – VDROPOUT. Note 7: The DFN output FET on-resistance in dropout is guaranteed by correlation to wafer level measurements.

VIN (V) CURRENT LIMIT (mA) 600 800 1000 3 5

3025 G08

VBIAS = 3.6V VOUT = 0V TYPICAL PERFORMANCE CHARACTERISTICS Dropout Voltage vs IOUT Operating BIAS Current vs Output Load BIAS No Load Operating Current VIN No Load Operating Current V IN Shutdown Current Adjust Voltage vs Temperature SHDN Threshold vs Temperature Current Limit vs V IN Voltage Burst Mode DC/DC Buck Ripple Rejection IOUT (mA) 150 250

3025 G01

DROPOUT VOL TAGE (mV) TA = –40°C TA = 125°C TA = 25°C VBIAS = 2.8V IOUT (mA) 0.01 IBIAS (μA) 150 200 250 10 1000

3025 G02

0.1 1 100 300 350 400 –40°C 25°C 125°C VBIAS (V) 2.5 IBIAS (μA) 4 5

3025 G03

3 3.5 4.5 5.5 VIN = 1.5V VOUT = 1.2V 125°C 25°C–40°C VIN (V) 0.5 10 125°C 85°C 25°C –40°C 4.5

3025 G04

1.5 2.5 3.5 5.5 IIN (μA) VBIAS = 5V VOUT = 0.8V VIN (V) 0.5 25°C –40°C 4.5

3025 G05

1.5 2.5 3.5 5.5 IIN (μA) 85°C VBIAS = 5V TEMPERATURE (°C) –50

395 ADJUST VOLTAGE (mV)

3025 G06

–25 25 100 125 VBIAS = 3.6V VIN = 1.5V IOUT = 10μA TEMPERATURE (°C) –50 SHDN THRESHOLD (mV) 100 300 400 500 1000 700 0 50 75

3025 G07

–25 25 100 125 VBIAS = 2.5V VBIAS = 5V VIN AC 100mV/DIV VOUT AC 10mV/DIV VIN = 1.8V VOUT = 1.5V COUT = 1μF IOUT = 50mA 10μs/DIV

3025 G09

FREQUENCY (Hz) 100

3025 G10

REJECTION (dB) VBIAS = 3.6V VIN = 1.5V VOUT = 1.2V IOUT = 100mA COUT = 10μF COUT = 1mF FREQUENCY (Hz) 100

3025 G11

REJECTION (dB) VBIAS = 3.6V VIN = 1.5V VOUT = 1.2V IOUT = 100mA COUT = 10μF COUT = 1mF VIN (V) 1.2 REJECTION (dB) 1.6 2.0 2.2

3025 G12

1.4 1.8 2.4 2.6 VBIAS = 3.6V VOUT = 1.2V IOUT = 100mA IOUT = 300mA COUT = 1μF COUT = 10μF 250mA 10mA IOUT VOUT AC 10mV/DIV VIN = 1.5V VOUT = 1.2V VBIAS = 3.6V COUT = 1μF 100μs/DIV

3025 G13

TYPICAL PERFORMANCE CHARACTERISTICS VIN Ripple Rejection vs Frequency BIAS Ripple Rejection vs Frequenc 3MHz VIN Supply Rejection T ransient Response

BIAS (Pin 1): BIAS Input Voltage. BIAS provides internal power for L TC3025 circuitry. The BIAS pin should be lo- cally bypassed to ground if the L TC3025 is more than a few inches away from another source of bulk capacitance. In general, the output impedance of a battery rises with frequency, so it is usually advisable to include an input bypass capacitor in battery-powered circuits. A capacitor in the range of 0.01μF to 0.1μF is usually suffi cient. GND (Pin 2): Ground. Connect to a ground plane. IN (Pin 3): Input Supply Voltage. The output load current is supplied directly from IN. The IN pin should be locally bypassed to ground if the L TC3025 is more than a few inches away from another source of bulk capacitance. In general, the output impedance of a battery rises with frequency, so it is usually advisable to include an input bypass capacitor when supplying IN from a battery. A capacitor in the range of 0.1μF to 1μF is usually suffi cient. OUT (Pin 4): Regulated Output Voltage. The OUT pin supplies power to the load. A minimum ceramic output capacitor of at least 1μF is required to ensure stability. Larger output capacitors may be required for applications with large transient loads to limit peak voltage transients. See the Applications Information section for more informa- tion on output capacitance. ADJ (Pin 5): Adjust Input. This is the input to the error amplifi er . The ADJ pin reference voltage is 0.4V referenced to ground. The output voltage range is 0.4V to 3.6V and is typically set by connecting ADJ to a resistor divider from OUT to GND. See Figure 2. SHDN (Pin 6): Shutdown Input, Active Low. This pin is used to put the L TC3025 into shutdown. The SHDN pin current is typically less than 10nA. The SHDN pin cannot be left fl oating and must be tied to a valid logic level (such as BIAS) if not used. Exposed Pad (Pin 7): Ground and Heat Sink. Must be soldered to PCB ground plane or large pad for optimal thermal performance. 2 4 IN OUT 6μA 3025 BD ADJ GND SHDN BIAS REFERENCE SHDN 0.4V SOFT-START

available in common LDOs (range of 0.4V to 3. 6V). response inherent in most LDO regulator architectures. from heavy to light output loads (see Figure 1). other stray capacitance to the ADJ pin.

3025 F01

3025 F02

Figure 1. L TC3025 T ransient Response Figure 2. Programming the L TC3025

or degraded performance may occur . protect the device during momentary overload conditions. heat sources mounted nearby must also be considered.

3025 F03

3025 F04

Figure 3. Ceramic Capacitor DC Bias Characteristics Figure 4. Ceramic Capacitor Temperature Characteristics

resistance can be less than 60°C/W . power dissipation is only about 1mW , thus can be ignored. junction temperature drops back to approximately 140°C. 5 shows the start-up and shutdown output waveform.

3025 F05

Figure 5. Output Start-Up and Shutdown

OUTPUT CURRENT (mA) EFFICIENCY (%) 100 0.1 10 100 1000

3025 TA03

VOUT = 1.5V VOUT = 1.2V TYPICAL APPLICATION High Effi ciency 1.5V Step-Down Converter with Effi cient 1.2V VLDO Output LTC3025 BIAS 0.1μF 1μF IN SHDN OUT 80.6k VOUT = 1.2V IOUT ≤ 300mA 40.2k

3025 TA02

CIN** 4.7μF CER V IN 2.7V TO 5.5V L TC3406-1.5 RUN 2.2μH* MURATA LQH32CN2R2M33 TAIYO YUDEN JMK212BJ475MG TAIYO YUDEN JMK316BJ106ML SW4 COUT+ 10μF CER VOUT 1.5V 600mAVOUT GND Effi ciency vs Output Current

Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However , no responsibility is assumed for its use. Linear Technology Corporation makes no representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights. PACKAGE DESCRIPTION 6-Lead Plastic DFN (2mm × 2mm) (Reference L TC DWG # 05-08-1703) 2.00 p0.10 (4 SIDES) NOTE: 1. DRAWING TO BE MADE A JEDEC PACKAGE OUTLINE M0-229 VARIATION OF (WCCD-2) 2. DRAWING NOT TO SCALE 3. ALL DIMENSIONS ARE IN MILLIMETERS 4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE 5. EXPOSED PAD SHALL BE SOLDER PLATED 6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION ON THE TOP AND BOTTOM OF PACKAGE 0.38 p 0.05 BOTTOM VIEW—EXPOSED PAD 0.56 p 0.05 (2 SIDES) 0.75 p0.05 R = 0.115 TYP 1.37 p0.05 (2 SIDES) PIN 1 BAR TOP MARK (SEE NOTE 6)

0.200 REF

0.00 – 0.05 (DC6) DFN 1103 0.25 p 0.05 1.42 p0.05 (2 SIDES) RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS 0.61 p0.05 (2 SIDES)1.15 p0.05 0.675 p0.05 2.50 p0.05 PACKAGE OUTLINE 0.25 p 0.05 0.50 BSC0.50 BSC PIN 1 CHAMFER OF EXPOSED PAD

Linear Technology Corporation 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear .com © LINEAR TECHNOLOGY CORPORATION 2004 LT 0908 REV B • PRINTED IN USA RELATED PARTS PART NUMBER DESCRIPTION COMMENTS LT 1129 700mA, Micropower , LDO V IN: 4.2V to 30V , VOUT(MIN) = 3.75V , VDO = 0.40V , IQ = 50μA, ISD < 16μA, VOUT = Adj, 3.3V , 5V , DD, SOT-223, S8, TO-220, TSSOP20 Packages L T1175 500mA, Micropower , Negative LDO V IN: –20V to –4.3V , VOUT(MIN) = –3.8V , VDO = 0.50V , IQ = 45μA, ISD < 10μA, VOUT = Adj, –5V , DD, SOT-223, S8, N8 Packages. Guaranteed Voltage Tolerance and Line/Load Regulation L T1185 3A, Negative LDO V IN: –35V to –4.2V , VOUT(MIN) = –2.40V , VDO = 0.80V , IQ = 2.5mA, ISD < 1μA, VOUT = Adj, TO-220 Package. Accurate Programmable Current Limit, Remote Sense L T1761 100mA, Low Noise Micropower , LDO V IN: 1.8V to 20V , VOUT(MIN) = 1.22V , VDO = 0.30V , IQ = 20μA, ISD < 1μA, TM Package. Low Noise < 20μVRMSP-P, Stable with 1μF Ceramic Capacitors L T1762 150mA, Low Noise Micropower LDO V IN: 1.8V to 20V , VOUT(MIN) = 1.22V , VDO = 0.30V , IQ = 25μA, ISD < 1μA, VOUT = Adj, 2.5V , 3V , 3.3V , 5V , MS8 Package. Low Noise < 20μVRMSP-P L T1763 500mA, Low Noise Micropower LDO V IN: 1.8V to 20V , VOUT(MIN) = 1.22V , VDO = 0.30V , IQ = 30μA, ISD < 1μA, L T1764/L T1764A 3A, Low Noise, Fast T ransient Response, LDO V IN: 2.7V to 20V , VOUT(MIN) = 1.21V , VDO = 0.34V , IQ = 1mA, ISD < 1μA, VOUT = 1.8V , 2.5V , 3.3V , DD, TO-220 Packages. Low Noise < 40μVRMSP-P, “A” Version Stable with Ceramic Capacitors L TC1844 150mA, Very Low Dropout LDO V IN: 1.6V to 6.5V , VOUT(MIN) = 1.25V , VDO = 0.08V , IQ = 40μA, ISD < 1μA, Low Noise < 30μVRMSP-P, Stable with 1μF Ceramic Capacitors L T1962 300mA, Low Noise Micropower LDO V IN: 1.8V to 20V , VOUT(MIN) = 1.22V , VDO = 0.27V , IQ = 30μA, ISD < 1μA, L T1963/L T1963A 1.5A, Low Noise, Fast T ransient Response, LDO V IN: 2.1V to 20V , VOUT(MIN) = 1.21V , VDO = 0.34V , IQ = 1mA, ISD < 1μA, Low Noise < 40μVRMSP-P, “A”Version Stable with Ceramic Capacitors L T1964 200mA, Low Noise Micropower , Negative LDO V IN: –0.9V to –20V , VOUT(MIN) = –1.21V , VDO = 0.34V , IQ = 30μA, ISD < 3μA, VOUT = Adj, –5V , ThinSOT Package. Low Noise < 30μVRMSP-P, Stable with Ceramic Capacitors L T3020 100mA, Low Voltage, VLDO V IN: 0.9V to 10V , VOUT(MIN) = 0.20V , VDO = 0.15V , IQ = 120μA, ISD < 3μA, VOUT = Adj, DFN, MS8 Package L T3023 Dual, 2 × 100mA, Low Noise Micropower , LDO V IN: 1.8V to 20V , VOUT(MIN) = 1.22V , VDO = 0.30V , IQ = 40μA, ISD < 1μA, VOUT = Adj, DFN, MS Packages. Low Noise < 20μVRMSP-P, Stable with 1μF Ceramic Capacitors L T3024 Dual 100mA/500mA, Low Noise Micropower , LDO VIN: 1.8V to 20V , VOUT(MIN) = 1.22V , VDO = 0.30V , IQ = 60μA, ISD < 1μA, VOUT = Adj, DFN, TSSOP Packages. Low Noise < 20μVRMSP-P, Stable with 1μF Ceramic Capacitors ThinSOT is a trademark of Linear Technology Corporation.