LiPo Power Board

1 year ago 82
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  • BOM
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Description

LiPo Power Board is a power manager for your battery-powered product. Since the breakout format, it is intended for prototyping and development. It is designed for a single cell LiPo battery (3,7V) and to supply 2 voltages: a fixed 3.3V and a secondary adjustable output, able to deliver higher voltage and current. A physical switch allows you to cut out the voltage on both channels. USB-C and Jack connectors allow to recharge the battery up to 1A.

The boost part is very flexible since you can just change the ratio between 2 resistors to change the voltage output. Moreover you can copy and paste it to get a third voltage output.

A typical application in which this board finds a perfect suit is where the MCU runs at 3.3V and sensors and actuators (such as LEDs WS2812B) requires higher and stable voltage.

Main components

  • a low dropout voltage regulator fixed to 3.3V, Microchip MCP1725
  • a variable boost voltage regulator, Aerosemi MT3608
  • a multisource recharger for single cell LiPo, Microchip MCP73837
  • Switch ON/OFF
  • A number of different connectors: USB-C; Jack Barrel connector; JST-PH (2.0mm, 2-pin); screw terminal (2.54mm pitched, 2 pins)

Assembling

You will need hot air gun for fine-pitched components such as USB-C and MCP73837.

Usage

This circuit is designed to work with a battery always connected. For developing purpose, you may need to detach the battery. In this case, you may activate the LDO mode (available through USB-C only), shorting SEL2 and opening SEL1. Otherwise, in the default configuration (with battery) keep SEL2 open and SEL1 don't care.

Pinout

The list of the pins and their functionality:

Pin Description
GND Ground
3.3V Regulated output at 3.3V
VBAT Unregulated battery voltage
5V Regulated output at 5V (adjustable)
PWR Output HIGH after 200us the 3.3V is stable, otherwise grounded
SON Set HIGH to activate the voltage regulators, LOW to turn off them. It is an alternative to the physical switch

Changelog

  • 1.0.0 ❌: First version
  • 1.1.0 ❌: Resistors for USB-C; Resistors for LEDs Status; test pad for PG and THERM on MCP73837; Selector for LDO mode; PROG2 is now connected to Vdd to enable charge
  • 1.2.0 ⚠: fix usb-c CC2 wire; USB holes footprint shrinked; add screw terminal for battery; mosfet to cut 5V power path when button is off; PCB is 2mm wider; minimum track width is 0.2mm. The exported gerber has a minor issue with a track that create a short circuit, solvable with a Dremel.
  • 1.3.0 ❎: Text height min 0.7mm; Resistors and Capacitor 0603 package; New Schottky Barrier Diode; Connect USB case to GND
  • 1.3.1 ⚠: Fix PWR (power good) pin, improve readability of schematic, enlarged some tracks, t name change: LiPo Power Board (hopefully the final one)
  • 1.4.0 ❔: fix missing GND of MT3608; add mounting holes; add header for an external on/off switch; remove useless resistor (R12); rounded corners

Versioning conventions

Each printed board has a version. Version advancements are ruled accordingly to Semantic Versioning.

To show the status of each version I use the following symbols:

  • A White Heavy Check Mark (✅) means that it is successfully tested;
  • A Negative Squared Cross Mark (❎) means that it was almost successfully tested (the main functionalities are fine), but there are bugs affecting minor funcionalities;
  • A Warning Sign (⚠) means that the board is not usable out of the box but the bugs are fixable in DIY (decent) fashion;
  • A Cross Mark (❌) means that there are some problems that makes it unusable;
  • A White Question Mark Ornament (❔) means not tested.

Future work

  • overcurrent protection (charge and discharge)

Documents

LiPo Power Board

LiPo Power Board

BOM

ID Name Designator Footprint Quantity
1 1M R13 R0603 1
2 10uH L1 L2020 1
3 STBY LED3 0603-LED 1
4 SMAJ5.0A-E3/61 D1,D2 SMA(DO-214AC) 2
5 MBR120VLSFT1G D4,D7,D3,D6 SOD-123F_L2.8-W1.8-LS3.7-RD 4
6 DC Jack Barrel J1 DC POWER CONNECTOR CLIFF DC10L FC681465 1
7 MSK-12C02 SWITCH MSK12C02 1
8 22uF C5,C6 C0603 2
9 10uF C4,C3 C0603 2
10 4.7uF C9,C1,C2 C0603 3
11 MT3608 U3 SOT-23-6 1
12 JST_2-PIN_Female JST1 JST-PH-2-SMT-RA 1
13 10k R6,R2 R0603 2
14 100k R3 R0603 1
15 8.2k R5 R0603 1
16 62k R4 R0603 1
17 1k R7,R8,R9,R1 R0603 4
18 5.1k R10,R11 R0603 2
19 Screw terminal 2pin P1 1X02_2.54_SCREWTERM 1
20 CHRG LED2 0603-LED 1
21 IRF7509TRPBF Q2 MSOP-8 1
22 Just a couple of 2.54-spaced pins SEL1,SEL2,EXT_BTN 1X02 2.54MM HOLES HEADERS PINS 3
23 MCP73837T-FCI/UN U1 MSOP-10 1
24 PWR LED1 0603-LED 1
25 MCP1725-3302E/SN U4 SOIC-8_L4.9-W3.9-P1.27-LS6.0-BL 1
26 Header-Female-2.54 P2 HDR-6X1/2.54 1
27 USB-310F USB1 USB-TYPE-S-C8.64X7.25 1

Attachments

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