Li-Ion/Li-Po 18650 Battery to 5V Boost Converter

  • Rajkumar Sharma
  • 65 Views
  • easy
  • Tested
  • SKU: EL122138
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The project presented here is capable of supplying 400mA of current from a 3.7V Li-Ion/Li-Po Battery input with a 5V output. The converter has an internal soft start and internal frequency compensation features. The project is built using LTC3426 SOT23-6 chip. The LTC3426 chip is in a low profile (1mm) SOT-23 package and has a very low shutdown current of about 0.5µA. A switching frequency of 1.2MHz allows a tiny solution. The tiny PCB can be mounted on the backside of the a 18650 battery holder. Jumper J1 is the shut-down jumper. Internal soft-start eases inrush current issues.

The LTC3426 step-up switching regulator generates an output voltage of up to 5.5V from an input voltage as low as 1.6V. Ideal for applications where space is limited, it switches at 1.2MHz, allowing the use of tiny, low cost and low-profile external components. Its internal 2A, 100mΩ NMOS switch provides high efficiency even at heavy load, while the constant frequency, current-mode architecture results in low, predictable output noise that is easy to filter. Anti-ringing circuitry reduces EMI concerns by damping the inductor while in discontinuous mode, and internal soft-start eases inrush current worries. Internal frequency compensation is designed to accommodate ceramic output capacitors, further reducing noise. The device features a very low shutdown current of 0.5µA.

Features

  • Input Supply 3.7V Li-Ion or Li-Po Battery
  • Output 5V DC
  • Load 400mA Maximum
  • Switching Frequency 1.2Mhz
  • Jumper J1 – Shutdown
  • Integrated Soft-Start
  • PCB Dimensions 69.85 x 19.05 mm

Schematic

Parts List

NOQNTY.REFDESCMANUFACTURERSUPPLIERPART NO
11CN12 PIN MALE HEADER PITCH 2.54MMWURTHDIGIKEY732-5315-ND
21CN22 PIN MALE HEADER PITCH 2.54MMWURTHDIGIKEY732-5315-ND
32C1,C410uF/6.3V SMD SIZE 1206MURATA/YAGEODIGIKEY
42C2,C50.1uF/50V SMD SIZE 0805MURATA/YAGEODIGIKEY
51C322uF/6.3V SMD SIZE 1206MURATA/YAGEODIGIKEY
61D1SS34 OR SS14 SMD DIODEON SEMIDIGIKEYSS14CT-ND
71J1JUMPER-2 PIN MALE HEADER PITCH 2.54MMWURTHDIGIKEY732-5315-ND
81L12.2uH/5.3AMURATAELEMENT 142871565
91R11M 1% SMD SIZE 0805MURATA/YAGEODIGIKEY
101R291K 1% SMD SIZE 0895MURATA/YAGEODIGIKEY
111R34.3K 1% SMD SIZE 0805MURATA/YAGEODIGIKEY
121R430K 1% SMD SIZE 0805MURATA/YAGEODIGIKEY
131R5910E 1% SMD SIZE 0805MURATA/YAGEODIGIKEY
141U1LTC3426 SMD SOT23-6ANALOG DEVICESDIGIKEYLTC3426ES6#TRPBFTR-ND
151J1SHUNT FOR JUMPER J1SULLIN CONNECTORDIGIKEYS9001-ND
161BTBATTERY HOLDER FOR ICR18650KEYSTONEDIGIKEY36-1043P-ND
18650 BATTERY HOLDERSUPPLIER: ALIEXPRESSor DIGIKEY

Connections



Gerber View

Photos

Video

LTC3426 Datasheet

3426fb

PCB

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