2 layers
Boostlet
RobotZwrrl/boostlet
Embeddable circuit board to boost battery to 5V for small robots.
55 parts
2 layers31.4 × 36.4 mm
Boostlet
RobotZwrrl/boostletEmbeddable circuit board to boost battery to 5V for small robots.
- Size
- 31.4 × 36.4 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 44
- Nets
- 17
- Pads
- 90
- Tracks, vias
- 236, 44
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- 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 of 31.4 × 36.4 mm with 44 parts on 17 nets, routed with 236 tracks and 44 vias.
It is built around the AP2111H-3.3TRG1, BSS138 and DMG3415U. Its parts include 9 resistors, 6 capacitors, 2 ICs, 2 transistors and 2 fuses. It belongs with the power and robots and motor control boards of this library.
Main components
3
AP2111H-3.3TRG1
SOT-223-40℃~+85℃@(Ta) 1 250mV@(600mA) 3.3V 50uVrms 55uA 600mA 65dB@(1kHz) 6V Fixed Positive Under Voltage Lockout、Over Current Protection、Over Temperature Protection SOT-223 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSDiodes IncorporatedVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
BSS138
SOT-23-55℃~+150℃ 1 N-channel 1.1Ω@10V、1.2Ω@4.5V 1.2V 1.7nC@10V 17.5pF 340mA 350mW 50V 6.5pF N-Channel SOT-23 MOSFETs ROHShongjiachengMOSFETsDMG3415U
SOT-23MOSFETsTECH PUBLIC
README
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
44| Qty | Value | Footprint | References |
|---|---|---|---|
| 12 | TestPoint | TestPoint:TestPoint_Pad_D1.5mm | TP1, TP2, TP3, TP4, TP5, TP6, TP11, TP12, TP13, TP14, TP15, TP16 |
| 4 | 100k | Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder | R3, R6, R8, R11 |
| 4 | Fiducial | Fiducial:Fiducial_1mm_Mask2mm | FID1, FID2, FID3, FID4 |
| 3 | 1 uF | Capacitor_SMD:C_1206_3216Metric_Pad1.33x1.80mm_HandSolder | C3, C4, C7 |
| 2 | 10k | Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder | R1, R2 |
| 2 | SolderJumper_2_Bridged | Jumper:SolderJumper-2_P1.3mm_Bridged_RoundedPad1.0x1.5mm | JP2, JP4 |
| 2 | SolderJumper_2_Open | Jumper:SolderJumper-2_P1.3mm_Open_RoundedPad1.0x1.5mm | JP1, JP3 |
| 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 | 1000 uF @ 16 V | Capacitor_SMD:CP_Elec_10x10 | C1 |
| 1 | 22 uF | Capacitor_SMD:C_1206_3216Metric_Pad1.33x1.80mm_HandSolder | C5 |
| 1 | 4.7 uH, 3 A | Inductor_SMD:L_Taiyo-Yuden_NR-60xx_HandSoldering | L1 |
| 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 | AP2111H-3.3TRG1 | Package_TO_SOT_SMD:SOT-223-3_TabPin2 | U4 |
| 1 | BSS138 | Package_TO_SOT_SMD:SOT-23 | Q1 |
| 1 | Conn_01x10_Socket | !RobotButterfly:Oval_1x10_P2.54mm | J4 |
| 1 | DMG3415U | Package_TO_SOT_SMD:SOT-23 | Q3 |
| 1 | PAM2401 | !EK_Library:PAM2401 | U1 |
| 1 | PMEG40T30ERX 40V 3A | Diode_SMD:D_SOD-123 | D2 |
| 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
How big is the Boostlet PCB?
It measures 31.4 × 36.4 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Boostlet use?
44 parts, built around the AP2111H-3.3TRG1, BSS138 and DMG3415U. 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/v1.2/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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