Step-Up DC-DC Converter – 9V Output @ 500mA
This project uses the LM2700 step-up DC/DC converter to efficiently generate a 9V output from a single Li-Ion battery. The compact board is an efficient replacement for 9V batteries (PP3), operating stably at up to 1.25 MHz for high efficiency.
This project features the LM2700 chip, a versatile high-current step-up DC/DC converter suitable for diverse applications. The board is configured to generate a 9V output from a single Li-Ion battery input. While optimized for 600kHz operation, the design maintains stability even at 1.25 MHz switching frequency. This compact solution, combining the custom board with a Li-Ion battery, serves as an efficient replacement for standard PP3 9V batteries. The LM2700’s high-efficiency switching architecture ensures minimal power loss during voltage conversion.
Features
- Input Supply 2.5V To 4.2V
- Output 9V DC
- Load Current 500mA
- Operating Frequency 600Khz
- On Board input Power LED
- Header Connector for Input and Output Power
- PCB Dimensions 32.39X10.08MM
The LM2700 is a step-up DC/DC converter with a 3.6A, 80mΩ internal switch and pin selectable operating frequency. With the ability to produce 500mA at 8V from a single Lithium-Ion battery, the LM2700 is an ideal part for biasing LCD displays. The LM2700 can be operated at switching frequencies of 600kHz and 1.25MHz allowing for easy filtering and low noise. An external compensation pin gives the user flexibility in setting frequency compensation, which makes possible the use of small, low ESR ceramic capacitors at the output. The LM2700 features continuous switching at light loads and operates with a switching quiescent current of 2.0mA at 600kHz and 3.0mA at 1.25MHz.
Connections
CN1: Pin 1 = DC Input 2.5V to 4.2V, Pin 2 = GND, Pin 3 = GND, Pin 4 = 9V DC Output
Schematic
Parts List
| NO. | QNTY. | REF. | DESC. | MANUFACTURER | SUPPLIER | SUPPLIER PART NO |
|---|---|---|---|---|---|---|
| 1 | 1 | CN1 | 4 PIN MALE HEADER PITCH 2.54MM | WURTH | DIGIKEY | 732-5317-ND |
| 2 | 1 | C1 | 47uF/16V CERAMIC SMD SIZE 1206/1210 | YAGEO/MURATA | ||
| 3 | 1 | C2 | 3.3nF/50V CERAMIC SMD SIZE 0805 | YAGEO/MURATA | ||
| 4 | 2 | C3,C4 | 22uF/16V CERAMIC SMD SIZE 0805 | YAGEO/MURATA | ||
| 5 | 1 | C5 | DNP | |||
| 6 | 1 | D1 | LED RED SMD SIZE 0603 | LITE-ON-INC | 160-1434-1-ND | |
| 7 | 1 | D2 | SS34 FAST DIODE | ONSEMI | SS34FSCT-ND | |
| 8 | 1 | L1 | 4.7uH/2A 6X6MM | WURTH | 732-74408063004CT-ND | |
| 9 | 1 | R1 | 2.2K 5% SMD SIZE 0603 | YAGEO/MURATA | ||
| 10 | 1 | R2 | 10K 5% SMD SIZE 0805 | YAGEO/MURATA | ||
| 11 | 1 | R3 | 150K 1% SMD SIZE 0805 | YAGEO/MURATA | ||
| 12 | 1 | R4 | 24K 1% SMD SIZE 0805 | YAGEO/MURATA | ||
| 13 | 1 | U1 | LM2700 | TI | 296-35267-1-ND |
Connections
Block Diagram
Gerber View
Photos
