2 layers44.1 × 37.1 mm
Boostlet
RobotZwrrl/boostlet
Embeddable circuit board to boost battery to 5V for small robots.
55 parts
2 layers
Boostlet
RobotZwrrl/boostletEmbeddable circuit board to boost battery to 5V for small robots.
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 55
- Nets
- 34
- Pads
- 123
- Tracks, vias
- 173, 5
- Routed
- Yes
- KiCad
- KiCad 7 (file 20221018)
- Created
- 31 Dec 2023
- Updated
- 5 Jun 2026
Overview
Boostlet is an open-source printed circuit board by RobotZwrrl, from the RobotZwrrl/boostlet repository on GitHub. It is a 2-layer board with 55 parts on 34 nets, routed with 173 tracks and 5 vias.
It is built around the AP2112K-3.3 and BSS138. Its parts include 10 resistors, 8 capacitors, 4 connectors, 3 transistors and 2 ICs. It belongs with the power and robots and motor control boards of this library.
Main components
2README
README.mdBoostlet!
Embeddable circuit board to boost battery input to 5V intended for small robots. Useful access is provided to two logic level convertors for Neopixels, and a 3.3V regulator. Input and output are protected with PTCs, with the option to not populate with a solder jumper. Castellated connectors enable this circuit board to be added either surface mount or with through-hole 0.1" headers.
Documentation
Dimensions: 35 mm x 40 mm
- V_IN: 0.9 - 4.75V
- V_OUT: 5V, 3A
- V_REG: 3.3V, 1A
Connectors
J1
- VCC
- NEO_IN2
- NEO_OUT2
- BATT_SIG
- NEO_IN1
- NEO-OUT1
- GND
J2 (Input)
- V_IN (V_BATT)
- GND
- VCC
J3 (Output)
- V_OUT (5V)
- GND
- V_REG (3.3V)
Solder Jumpers
- JP1 (open): Bypass input PTC
- JP2 (connected): Enable 3.3V reg powered from 5V boost output
- JP3 (open): Bypass output PTC
- JP4 (connected): Connect 3.3V reg output to Vcc (be sure Vcc isn't connected to anything!)
Add solder to connect the open jumpers, or cut the trace between the already connected jumpers to close them
Documentation provided under CC-BY-4.0
License
Boostlet! (C) Copyright Erin RobotZwrrl, Robot Missions Inc.
12-30-23 v1.0
This hardware is released under:
CERN Open Hardware License Version 2.0 - Permissive (CERN-OHL-P)
Disclaimer: Distributed as is. No warranty is given. Not responsible or liable for any damage or harm that result from this product.
Parts
55| Qty | Value | Footprint | References |
|---|---|---|---|
| 17 | TestPoint | TestPoint:TestPoint_Pad_D1.5mm | TP1, TP2, TP3, TP4, TP5, TP6, TP7, TP8, TP10, TP11, TP12, TP13, TP14, TP15, TP16, TP17 +1 |
| 4 | 10k | Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder | R1, R3, R4, R5 |
| 4 | Fiducial | Fiducial:Fiducial_1mm_Mask2mm | FID1, FID2, FID3, FID4 |
| 3 | 100k | Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder | R2, R6, R8 |
| 3 | SolderJumper_2_Open | Jumper:SolderJumper-2_P1.3mm_Open_RoundedPad1.0x1.5mm | JP1, JP2, JP3 |
| 2 | 1 uF | Capacitor_SMD:C_1206_3216Metric_Pad1.33x1.80mm_HandSolder | C7, C8 |
| 2 | 4.7 uF | Capacitor_SMD:C_1206_3216Metric_Pad1.33x1.80mm_HandSolder | C3, C6 |
| 2 | 680 uF @ 10 V | Capacitor_SMD:CP_Elec_10x10 | C1, C4 |
| 2 | BSS138 | Package_TO_SOT_SMD:SOT-23 | Q1, Q3 |
| 2 | Conn_01x05_Socket | !EK_Library:Castellated_1x05_P2.54mm | J3, J4 |
| 1 | 10 uF | Capacitor_SMD:C_1206_3216Metric_Pad1.33x1.80mm_HandSolder | C2 |
| 1 | 100 | Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder | R9 |
| 1 | 2.2 uH, 3 A | !EK_Library:INDUCTOR_IND_IFSC_1515AH_VIS-M | L1 |
| 1 | 22 uF | Capacitor_SMD:C_1206_3216Metric_Pad1.33x1.80mm_HandSolder | C5 |
| 1 | 6.8k | Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder | R10 |
| 1 | 750k | Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder | R7 |
| 1 | AP2112K-3.3 | Package_TO_SOT_SMD:SOT-23-5 | U2 |
| 1 | Conn_01x09_Socket | !EK_Library:Castellated_1x09_P2.54mm | J1 |
| 1 | Conn_01x11_Socket | !EK_Library:Castellated_1x11_P2.54mm | J2 |
| 1 | D_Schottky 3A | Diode_SMD:D_SOD-123 | D1 |
| 1 | NPN 3A | !EK_Library:2N2222-SOT-23-3 | Q2 |
| 1 | PAM2401 | !EK_Library:PAM2401 | U1 |
| 1 | Polyfuse 16V, 1.25A I_h, 2.5A I_t, 400 ms | Fuse:Fuse_1812_4532Metric_Pad1.30x3.40mm_HandSolder | F2 |
| 1 | Polyfuse 6V, 1.5A I_h, 3A I_t, 500 ms | Fuse:Fuse_1812_4532Metric_Pad1.30x3.40mm_HandSolder | F1 |
Questions
What parts does the Boostlet use?
55 parts, built around the AP2112K-3.3 and BSS138. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Boostlet KiCad files?
From the RobotZwrrl/boostlet repository on GitHub, at the commit this page was made from: the board is archive/v0.0_transistor/boostlet.kicad_pcb and its schematic archive/v0.0_comparator/boostlet.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Boostlet design in my own project?
Its repository states no licence, so its author keeps all rights: ask RobotZwrrl before reusing the design.
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