ET-P20
ICL7660 Negative Voltage Generator
Makes −5 V from +5 V for op-amps and LCDs
AED 9.00
Out of stock✓ TestedEvery board is checked before it ships
🚚 Fast shippingUAE 1–3 days · GCC & worldwide
💬 Engineer supportQuestions answered by the designers
Overview
Makes −5 V from +5 V for op-amps and LCDs
The ET-P20 is built around the Maxim ICL7660 — 10kHz charge pump, 98% voltage conversion, ~55Ω output.
Designed in Dubai by ElectroTrical — the full schematic, BOM and design notes are published below.
Good for
- Dual-supply op-amp circuits
- LCD contrast bias
- Bipolar ADC inputs
Key features
What makes it different
IC
Maxim ICL7660: 10kHz charge pump, 98% voltage conversion, ~55Ω output
Output
≈ −V+ at no load, −4.5V at 10mA from 5V
Use
Negative rail for op-amps, LCD bias, ADC bipolar inputs
Open documentation
Schematic, BOM and layout notes published for every board.
Breadboard friendly
Standard 2.54 mm pitch and M2.5 mounting holes.
Specifications
Technical specifications
| IC | Maxim ICL7660: 10kHz charge pump, 98% voltage conversion, ~55Ω output |
|---|---|
| Output | ≈ −V+ at no load, −4.5V at 10mA from 5V |
| Use | Negative rail for op-amps, LCD bias, ADC bipolar inputs |
| Size | 25.4 × 12.7 mm |
|---|---|
| Mounting | 2 mounting holes (M2.5) |
| Connectors | 3-pin 2.54 mm header · Screw terminal 2P 5.0mm 17A (THT) — In / −out |
| Main IC | ICL7660ESA+T (LCSC C407899) |
| Revision | Rev A |
Performance
Output
Pinout
Pin map and connections
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | V+ | Power | 1.5–10V (LV open: 3.5–10V) |
| 2 | GND | Ground | Ground |
| 3 | VOUT | Power | ≈ −V+ (10mA) |
Mechanical
Dimensions and what's in the box
In the box
- 1 × ET-P20 ICL7660 Negative Voltage Generator (assembled)
- 1 × 3-pin 2.54 mm male header, unsoldered
Getting started
- Wire the header: V+, GND, VOUT
Compare
Which USB-C power board?
| ICL7660 Negative Voltage Generator (this board)This board | ET-P14 USB-C PD Trigger 9/12/20 V | ET-A06 USB-C Breadboard Power Supply | |
|---|---|---|---|
| What it does | Makes −5 V from +5 V for op-amps and LCDs | Get 9, 12 or 20 V from any USB-C PD charger | 5 V and 3.3 V on both breadboard rails from USB-C |
| Interface | — | — | USB-C 5V (Rd on CC → works with any USB-C… |
| Best for | Dual-supply op-amp circuits | 12 V LED strips from a laptop charger | Breadboard prototyping |
| Price | 9 AED | 23 AED | 9 AED |
Downloads
Documents and design files
Need a custom version of this board?
Different connector, size or sensor? We design and build custom variants.