LTM4604 LINER | Alldatasheet
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FEATURES
APPLICATIONS
DESCRIPTION
Low Voltage, 4A DC/DC µModuleTM with Tracking The LTM®4604 is a complete 4A switch mode DC/DC power supply. Included in the package are the switching control- ler, power FETs, inductor and all support components. Operating over an input voltage range of 2.375V to 5.5V, the LTM4604 supports an output voltage range of 0.8V to 5V, set by a single resistor. This high effi ciency design delivers up to 4A continuous current (5A peak). Only bulk output capacitors are needed to complete the design. The low profi le package (2.3mm) enables utilization of unused space on the bottom of PC boards for high density point of load regulation. High switching frequency and a current mode architecture enable a very fast transient response to line and load changes without sacrifi cing stability. The device supports output voltage tracking for supply rail sequencing. Fault protection features include foldback current protec- tion, thermal shutdown and a programmable soft-start function. The LTM4604 is offered in a space saving and thermally enhanced 15mm × 9mm × 2.3mm LGA package and is Pb free and RoHS compliant. 3.3V to 2.5V/4A μModule Regulator ■ Complete Standalone Power Supply ■ Wide Input Voltage Range: 2.375V to 5.5V ■ 4A DC, 5A Peak Output Current ■ 0.8V to 5V Output ■ Output Voltage Tracking ■ ± 2% Total DC Error ■ UltraFastTM Transient Response ■ Power Good Indicator ■ Current Mode Control ■ Current Foldback Protection, Parallel/Current Sharing ■ Up to 95% Effi ciency ■ Programmable Soft-Start ■ Micropower Shutdown: I Q ≤ 7μA ■ Overtemperature Protection ■ Small and Very Low Profi le Package: 15mm × 9mm × 2.3mm LGA ■ Telecom and Networking Equipment ■ Servers ■ Storage Cards ■ ATCA Cards ■ Industrial Equipment , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. μModule and UltraFast are trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. VIN VIN VIN 3.3V PGOOD COMP LTM4604 RUN/SS 2.37k
4604 TA01a
22μF 6.3V V OUT 2.5V 10μF 6.3V VOUT FB TRACK GND OUTPUT CURRENT (A) 100 /K34/K36/K30/K34 /K47/K30/K32 12 4 EFFICIENCY (%) VIN = 3.3V VOUT = 2.5V Effi ciency vs Output Current
ELECTRICAL CHARACTERISTICS
Operating Temperature Range (Note 2) ... –40°C to 85°C (Note 1) SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS VIN(DC) Input DC Voltage ● 2.375 5.5 V VOUT(DC) Output Voltage, Total Variation with Line and Load CIN = 10μF × 1, COUT = 22μF ×3, RFB = 5.69k 0.5% VIN = 2.375V to 5.5V, IOUT = 0A to 4A, 0°C ≤ TA ≤ 85°C VIN = 2.375V to 5.5V, IOUT = 0A to 4A ● 1.478 1.470 1.5 1.5 1.522 1.522 V V Input Specifi cations V IN(UVLO) Undervoltage Lockout Threshold IOUT = 0A 1.75 2 2.3 V IINRUSH(VIN) Peak Input Inrush Current at Start-Up I OUT = 0A, CIN = 10μF, COUT = 22μF ×3, RUN/SS = 0.01μF, VOUT = 1.5V VIN = 3.3V VIN = 5V 0.7 0.7 A A I Q(VIN NOLOAD) Input Supply Bias Current V IN = 3.3V, VOUT = 1.5V, No Switching VIN = 3.3V, VOUT = 1.5V, Switching Continuous VIN = 5V, VOUT = 1.5V, No Switching VIN = 5V, VOUT = 1.5V, Switching Continuous Shutdown, RUN = 0, VIN = 5V 100 μA mA μA mA μA The ● denotes the specifi cations which apply over the full operating temperature range, otherwise specifi cations are at TA = 25°C. VIN = 5V unless otherwise noted. See Figure 15. PIN CONFIGURATION GND GND RUN/ SSSW A BCDEFG TRACK TOP VIEW LGA PACKAGE 66-PIN (15mm /KB4 9mm /KB4 2.3mm) PGOOD COMP V OUT VIN FB TJMAX = 125°C, θJA = 25°C/W, WEIGHT = 0.86g ORDER INFORMATION LEAD FREE FINISH TRAY PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTM4604EV#PBF LTM4604IV#PBF LTM4604EV#PBF LTM4604IV#PBF LTM4604V LTM4604V 15mm × 9mm × 2.3mm LGA 15mm × 9mm × 2.3mm LGA –40°C to 85°C –40°C to 85°C Consult LTC Marketing for parts specifi ed with wider operating temperature ranges. *The temperature grade is identifi ed by a label on the shipping container. Consult LTC Marketing for information on non-standard lead based fi nish parts. For more information on lead free part marking, go to: http://www.linear.com/leadfree/ This product is only offered in trays. For more information go to: http://linear.com/packaging/
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. ELECTRICAL CHARACTERISTICS The ● denotes the specifi cations which apply over the full operating temperature range, otherwise specifi cations are at TA = 25°C. VIN = 5V unless otherwise noted. See Figure 15. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS IS(VIN) Input Supply Current V IN = 2.5V, VOUT = 1.5V, IOUT = 4A VIN = 3.3V, VOUT = 1.5V, IOUT = 4A VIN = 5V, VOUT = 1.5V, IOUT = 4A 2.9 2.2 1.45 A A A Output Specifi cations I OUT(DC) Output Continuous Current Range (See Output Current Derating Curves for Different V IN, VOUT and TA) VIN = 3.3V, VOUT = 1.5V 4 A ΔVOUT(LINE) VOUT ΔVOUT(LOAD) VOUT Load Regulation Accuracy V OUT = 1.5V, 0A to 4A VIN = 3.3V VIN = 5V 0.3 0.3 0.6 0.6 VOUT(AC) Output Ripple Voltage I OUT = 0A, COUT = 22μF/X5R/Ceramic ×3 VIN = 3.3V, VOUT = 1.5V VIN = 5V, VOUT = 1.5V mVP-P mVP-P fS Output Ripple Voltage Frequency IOUT = 4A, VIN = 5V, VOUT = 1.5V 1.25 MHz ΔVOUT(START) Turn-On Overshoot C OUT = 22μF ×3, VOUT = 1.5V, RUN/SS = 10nF, IOUT = 0A VIN = 3.3V VIN = 5V mV mV tSTART Turn-on Time C OUT = 22μF ×3, VOUT = 1.5V, IOUT = 1A Resistive Load, TRACK = VIN and RUN/SS = Float VIN = 3.3V VIN = 5V 1.5 1.0 ms ms ΔVOUT(LS) Peak Deviation for Dynamic Load Step Load: 0% to 50% to 0% of Full Load, COUT = 22μF ×3 Ceramic VIN = 5V, VOUT = 1.5V 25 mV tSETTLE Settling Time for Dynamic Load Step Load: 0% to 50% to 0% of Full Load VIN = 5V, VOUT = 1.5V 10 μs IOUT(PK) Output Current Limit C OUT = 22μF ×3 VIN = 3.3V, VOUT = 1.5V VIN = 5V, VOUT = 1.5V A A Control Section V FB Voltage at FB Pin I OUT = 0A, VOUT = 1.5V, 0°C ≤ TA ≤ 85°C IOUT = 0A, VOUT = 1.5V ● 0.792 0.788 0.8 0.8 0.808 0.812 V V I FB 0.2 μA VRUN RUN Pin On/Off Threshold 0.5 0.65 0.8 V ITRACK TRACK Pin Current 0.2 μA VTRACK(OFFSET) Offset Voltage TRACK = 0.4V 30 mV VTRACK(RANGE) Tracking Input Range 0 0.8 V RFBHI Resistor Between VOUT and FB Pins 4.975 4.99 5.025 k Ω PGOOD ΔVPGOOD PGOOD Range ±7.5 % RPGOOD PGOOD Resistance Open-Drain Pull-Down 90 150 Ω Note 2: The LTM4604E is guaranteed to meet performance specifi cations from 0°C to 85°C. Specifi cations over the – 40°C to 85°C operating temperature range are assured by design, characterization and correlation with statistical process controls. The LTM4604I is guaranteed over the full –40°C to 85°C temperature range.
TYPICAL PERFORMANCE CHARACTERISTICS Effi ciency vs Output Current VIN = 2.5V Minimum Input Voltage at 4A Load Load Transient Response Effi ciency vs Output Current VIN = 3.3V Effi ciency vs Output Current VIN = 5V OUTPUT CURRENT (A) 100 /K34/K36/K30/K34 /K47/K30/K31 12 4 EFFICIENCY (%) VOUT = 1.8V VOUT = 1.5V VOUT = 1.2V VOUT = 0.8V OUTPUT CURRENT (A) 100 /K34/K36/K30/K34 /K47/K30/K32 12 4 EFFICIENCY (%) VOUT = 2.5V VOUT = 1.8V VOUT = 1.5V VOUT = 1.2V VOUT = 0.8V OUTPUT CURRENT (A) EFFICIENCY (%) 12 34 /K34/K36/K30/K34 /K47/K30/K33 VOUT = 3.3V VOUT = 2.5V VOUT = 1.8V VOUT = 1.5V VOUT = 1.2V VOUT = 0.8V VIN (V) VOUT (V) 0.5 1.5 2.0 2.5 3.5 0.5 2.5 3.5
4604 G04
1.0 3.0 2 4.5 5.551 1.5 34 VOUT = 3.3V VOUT = 2.5V VOUT = 1.8V VOUT = 1.5V VOUT = 1.2V VOUT = 0.8V ILOAD 2A/DIV VOUT 20mV/DIV VIN = 5V VOUT = 1.2V COUT = 4 × 22μF, 6.3V CERAMICS 20μs/DIV
4604 G05
VIN = 5V VOUT = 1.5V COUT = 4 × 22μF, 6.3V CERAMICS 20μs/DIV
4604 G06
VIN = 5V VOUT = 1.8V COUT = 3 × 22μF, 6.3V CERAMICS 20μs/DIV
4604 G07
VIN = 5V VOUT = 2.5V COUT = 3 /KB4 22/K6D F, 6.3V CERAMICS 20/K6D s/DIV
4604 G08
VIN = 5V VOUT = 3.3V COUT = 2 × 22μF, 6.3V CERAMICS 20μs/DIV
4604 G09
Load Transient Response Load Transient Response
TYPICAL PERFORMANCE CHARACTERISTICS Start-Up Start-Up Current Limit Foldback VOUT 1V/DIV IIN 1A/DIV VIN = 5V VOUT = 2.5V COUT = 4 × 22μF NO LOAD (0.01μF SOFT-START CAPACITOR) 200μs/DIV
4604 G10
VIN = 5V VOUT = 2.5V COUT = 4 × 22μF 4A LOAD (0.01μF SOFT-START CAPACITOR) 200μs/DIV
4604 G11
OUTPUT CURRENT (A) VOUT (V) 0.6 0.8 1.0 6 8
4604 G12
0.4 0.2 45 7 1.2 1.4 1.6 VIN = 5V VIN = 3.3V VIN = 2.5V VOUT = 1.5V Short-Circuit Protection 1.5V Short, No Load Short-Circuit Protection 1.5V Short, 4A Load VOUT 0.5V/DIV IIN 4A/DIV 20μs/DIV
4604 G13
0.5V/DIV IIN 1A/DIV 100μs/DIV
4604 G14
Temperature (C) -50
794 VFB (mV)
-25 50 0 25 100 75 /K34/K36/K30/K34 /K47/K31/K35
VIN (B1, C1, C3-C7, D7, E6 and E7): Power Input Pins. Apply input voltage between these pins and GND pins. Recommend placing input decoupling capacitance directly between V IN pins and GND pins. VOUT (D8-D11, E8-E11, F6-F11, G6-G11): Power Output Pins. Apply output load between these pins and GND pins. Recommend placing output decoupling capacitance directly between these pins and GND pins. Review Table 4. GND (G3-G5, F3-F5, E4-E5, A1-A11, B6-B11, C8-C11): Power Ground Pins for Both Input and Output Returns. TRACK (E1): Output Voltage Tracking Pin. When the module is confi gured as a master output, then a soft-start capaci- tor is placed on the RUN/SS pin to ground to control the master ramp rate. Slave operation is performed by putting a resistor divider from the master output to ground, and connecting the center point of the divider to this pin on the slave regulator. If tracking is not desired, then connect the TRACK pin to V IN. Load current must be present for tracking. See Applications Information section. FB (G2): The Negative Input of the Error Amplifi er. Inter- nally, this pin is connected to VOUT with a 4.99k precision resistor. Different output voltages can be programmed with an additional resistor between FB and GND pins. Two power modules can current share when this pin is connected in parallel with the adjacent module’s FB pin. See Applications Information section. COMP (G1): Current Control Threshold and Error Amplifi er Compensation Point. The current comparator threshold increases with this control voltage. Two power modules can current share when this pin is connected in parallel with the adjacent module’s COMP pin. PGOOD (F1): Output Voltage Power Good Indicator. Open- drain logic output that is pulled to ground when the output voltage is not within ±7.5% of the regulation point. RUN/SS (D1): Run Control and Soft-Start Pin. A voltage above 0.8V will turn on the module, and below 0.5V will turn off the module. This pin has a 1M resistor to V IN and a 1000pF capacitor to GND. See Application Infomation section for soft-start information. SW (B3 and B4): Switching Node of the circuit is used for testing purposes. This can be connected to copper on the board to improve thermal performance. Make sure not to connect it to other output pins. GND GND RUN/ SSSW A BCDEFG TRACK TOP VIEW PGOOD COMP V OUT VIN FB
Figure 1. Simplifi ed LTM4604 Block Diagram
The LTM4604 is a standalone non-isolated switch mode DC/DC power supply. It can deliver up to 4A of DC output current with few external input and output capacitors. This module provides a precise regulated output voltage programmable via one external resistor from 0.8V DC to 5.0V DC over a 2.375V to 5.5V input voltage. A typical application schematic is shown in Figure 15. The LTM4604 has an integrated constant frequency cur- rent mode regulator with built-in power MOSFETs with fast switching speed. The typical switching frequency is 1.25MHz. With current mode control and internal feedback loop compensation, the LTM4604 module has suffi cient stability margins and good transient performance under a wide range of operating conditions and with a wide range of output capacitors, even all ceramic output capacitors. Current mode control provides cycle-by-cycle fast current limit. In addition, foldback current limiting is provided in an overcurrent condition while V OUT drops. Internal overvoltage and undervoltage comparators pull the open- drain PGOOD output low if the output feedback voltage exits a ±7.5% window around the regulation point. Furthermore, in an overvoltage condition, internal top FET M1 is turned off and bottom FET M2 is turned on and held on until the overvoltage condition clears. Pulling the RUN pin below 0.5V forces the controller into its shutdown state, turning off both M1 and M2. At low load current, the module works in continuous current mode by default to achieve minimum output voltage ripple. The TRACK pin is used for power supply tracking. See the Applications Information section. The LTM4604 is internally compensated to be stable over a wide operating range. Table 4 provides a guideline for input and output capacitance for several operating condi- tions. An excel loop analysis tool is provided for transient and stability analysis. The FB pin is used to program the output voltage with a single resistor connected to ground.
A typical LTM4604 application circuit is shown in Figure 15. down ratio that can be achieved for a given input voltage. The PWM controller has an internal 0.8V reference voltage. Table 1. FB Resistor vs Output Voltage 4A maximum current is 2A or less. The LTM4604 is designed for low output voltage ripple. voltage droop and overshoot during a 2A/μs transient. in steady-state operation, but also in transient.
1.62k COUT1 22μF 6.3V ×3 X5R OR X7R V MASTER 3.3V CIN1 10μF 6.3V X5R OR X7R CSSEXT RAMP CONTROL OR V IN VOUT FB TRACK GND VIN VIN PGOOD COMP LTM4604 RUN/SS RFB 5.76kRFB2 5.76k RFB1 4.99k
4604 F02
22μF 6.3V ×3 X5R OR X7R V SLAVE 1.5V CIN2 10μF 6.3V X5R OR X7R VOUT FB TRACK GND Figure 2 OUTPUT VOLTAGE (V) TIME MASTER OUTPUT SLAVE OUTPUT
4604 F03
The RUN/SS pin provides dual functions of enable and soft-start control. The RUN/SS pin is used to control turn on of the LTM4604. While this pin is below 0.5V, the LTM4604 will be in a 7μA low quiescent current state. A 0.8V threshold will enable the LTM4604. This pin can be used to sequence LTM4604 devices. The soft-start control is provided by a 1M pull-up resistor (R SS) and a 1000pF capacitor (CSS) as drawn in the Block Diagram. An external capacitor can be applied to the RUN/SS pin to increase the soft-start time. A typical value is 0.01μF. The approximate equation for soft-start is: t V VV RC CSOFTSTART IN IN SS SS SSE= ⎛ ⎠⎟ +ln –. •18 XXT() where RSS and C SS are shown in the Block Diagram of Figure 1, 1.8V is the soft-start upper range, and C SSEXT is the additional capacitance for further soft-start contol. The soft-start function can also be used to control the output ramp-up time, so that another regulator can be easily tracked. An independent ramp control signal can be applied to the master ramp, otherwise, connect the TRACK pin to V IN to disable tracking. Output Voltage Tracking Output voltage tracking can be programmed externally using the TRACK pin. The output can be tracked up and down with another regulator. The master regulator’s output is divided down with an external resistor divider that is the same as the slave regulator’s feedback divider to implement coincident tracking. The LTM4604 uses a very accurate 4.99k resistor for the top feedback resistor. Figure 2 shows an example of coincident tracking. V R kR VTRACK FB FB MASTER= + 249 9. • VTRACK is the track ramp applied to the slave’s TRACK pin. VTRACK applies the track reference for the slave output up to the point of the programmed value at which V TRACK proceeds beyond the 0.8V reference value. The V TRACK pin must go beyond 0.8V to ensure the slave output has reached its fi nal value. Load current must be present for proper tracking.
different resistor values to change the output tracking ratio. the correct resistor values for coincident or ratio tracking. a ±7.5% window around the regulation point. sharing. This will balance the thermals on the design. N is the number of paralleled modules. derating curves are derived. Figure 4. 1.2V Power Loss Figure 5. 2.5V Power Loss
4604 F04
4604 F05
Figure 6. 5VIN to 1.2VOUT No Heat Sink Figure 7. 5V IN to 1.2VOUT with Heat Sink
4606 F06
4606 F07
4606 F08
4606 F09
Figure 10. 5VIN to 2.5VOUT No Heat Sink Figure 11. 5V IN to 2.5VOUT with Heat Sink
4606 F10
4606 F11
4606 F12
4606 F13
Table 3. 2.5V Output Table 2. 1.2V Output Table 4. Output Voltage Response Versus Component Matrix (Refer to Figure 17), 0A to 2A Load Step Typical Measured Values
provided to protect each unit from catastrophic failure.
- Use large PCB copper areas for high current path, including V IN, GND and VOUT. It helps to minimize the PCB conduction loss and thermal stress.
- Place high frequency ceramic input and output capacitors next to the V IN, GND and V OUT pins to minimize high frequency noise.
- Place a dedicated power ground layer underneath the unit.
- To minimize the via conduction loss and reduce module thermal stress, use multiple vias for interconnection between top layer and other power layers.
- Do not put vias directly on the pads unless they are capped.
- SW pads can be soldered to board to improve thermal performance. Figure14 gives a good example of the recommended layout.
Figure 15. Typical 2.375V to 5.5V Input, 1.5V at 4A Design Figure 14. Recommended PCB Layout
- ••
- ••
- •••
- ••
- •• GND GND
4604 F14
4604 F15
Figure 16. Two LTM4604s in Parallel, 1.5V at 8A Design
4604 F16
Figure 17. 3.3V to 5V Input, 2.5V at 4A Design
4604 F17
NOTES: 1. DIMENSIONING AND TOLERANCING PER ASME Y14.5M-1994 2. ALL DIMENSIONS ARE IN MILLIMETERS LAND DESIGNATION PER JESD MO-222 5. PRIMARY DATUM -Z- IS SEATING PLANE 6. THE TOTAL NUMBER OF PADS: 66 DETAILS OF PAD #1 IDENTIFIER ARE OPTIONAL, BUT MUST BE LOCATED WITHIN THE ZONE INDICATED. THE PAD #1 IDENTIFIER MAY BE EITHER A MOLD OR A MARKED FEATURE SYMBOL aaa bbb TOLERANCE 0.15 0.10 9.00 BSC PACKAGE TOP VIEW LGA 66 0607 REV A 15.00 BSC PAD “A1” CORNER PADS SEE NOTES X Y aaa Z aaa Z 2.19 – 2.45 DETAIL A PACKAGE SIDE VIEW DETAIL A SUBSTRATEMOLD CAP 0.29 – 0.35 1.90 – 2.10 bbb Z Z 1.27 BSC 0.864 – 0.914 0.864 – 0.914 12.70 BSC 7.620 BSC PAD 182 1 43 F G E A B C D PACKAGE BOTTOM VIEW PACKAGE IN TRAY LOADING ORIENTATION 711 9 10 2.540 2.540 1.270 1.270 5.080 5.080 6.350 6.350 3.810 3.810 0.000 0.4445 0.4445 3.810 3.810 2.540 2.540 1.270 1.270 0.000 0.4445 0.4445 SUGGESTED PCB LAYOUT TOP VIEW LTMXXXXXX /K6D Module TRAY PIN 1 BEVEL COMPONENT PIN “A1” 66-Lead (15mm × 9mm × 2.32mm) (Reference LTC DWG # 05-08-1807 Rev A)
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 Pin Assignment Table (Arranged by Pin Number) PIN NAME PIN NAME PIN NAME PIN NAME PIN NAME PIN NAME PIN NAME A1 GND B1 V IN C1 V IN D1 RUN/SS E1 TRACK F1 PGOOD G1 COMP A2 GND B2 – C2 – D2 – E2 – F2 – G2 FB A3 GND B3 SW C3 V IN D3 – E3 – F3 GND G3 GND A4 GND B4 SW C4 V IN D4 – E4 GND F4 GND G4 GND A5 GND B5 – C5 V IN D5 – E5 GND F5 GND G5 GND A6 GND B6 GND C6 V IN D6 – E6 V IN F6 V OUT G6 V OUT A7 GND B7 GND C7 V IN D7 V IN E7 V IN F7 V OUT G7 V OUT A8 GND B8 GND C8 GND D8 V OUT E8 V OUT F8 V OUT G8 V OUT A9 GND B9 GND C9 GND D9 V OUT E9 V OUT F9 V OUT G9 V OUT A10 GND B10 GND C10 GND D10 V OUT E10 V OUT F10 V OUT G10 V OUT A11 GND B11 GND C11 GND D11 V OUT E11 V OUT F11 V OUT G11 V OUT
Linear Technology Corporation 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com © LINEAR TECHNOLOGY CORPORATION 2007 LT 0807 • PRINTED IN USA RELATED PARTS PART NUMBER DESCRIPTION COMMENTS LTC2900 Quad Supply Monitor with Adjustable Reset Timer Monitors Four Supplies; Adjustable Reset Timer LTC2923 Power Supply Tracking Controller Tracks Both Up and Down; Power Supply Sequencing LTM4600 10A DC/DC μModule Basic 10A DC/DC μModule LTM4601 12A DC/DC μModule with PLL, Output Tracking/ Margining and Remote Sensing Synchronizable, PolyPhase Operation, LTM4601-1 Version has no Remote Sensing LTM4602 6A DC/DC μModule Pin Compatible with the LTM4600 LTM4603 6A DC/DC μModule with PLL and Output Tracking/ Margining and Remote Sensing Synchronizable, PolyPhase Operation, LTM4603-1 Version has no Remote Sensing, Pin Compatible with the LTM4601 LTM4608 8A Low Voltage μModule 2.375V ≤ V IN ≤ 5V, Parallel for Higher Output Current, 9mm × 15mm × 2.8mm