DIODES AP3015 Micro Power Step Up DC-DC Converter User Manual
- June 8, 2024
- DIODES
Table of Contents
DIODES AP3015 Micro Power Step Up DC-DC Converter
FAQ
- Q: What is the recommended output capability of the AP3015 at different input voltages?
- A: The recommended maximum output capability is 40mA @ Vin=1.2V, 50mA @ Vin=1.5V, and 100mA @ Vin=2.5V.
- Q: How can I adjust the output voltage of the demo board?
- A: You can adjust the output voltage by modifying the values of the feedback resistors R1 and R2 based on the provided formula.
Description
The AP3015 is a step-up DC/DC converter, which can be used for 1 or 2 cell powered system. In fact, it is a standard boost circuit, where the AP3015 works as the driver and control device.
The AP3015 features a wide input voltage range. The operation voltage is ranged from 1.2V to 12V. And the output voltage is up to 34V. A current limited, fixed off-time control scheme conserves operating current, resulting in high efficiency over a broad range of load current. The switch and all of the control circuit are integrated in the AP3015, so fewer tiny external components are needed in the PCB board, which are bypass capacitor (Cin), boost inductor (L), boost schottky diode (D), output capacitor (Cout), feedback resistor network (R1,R2) and feedback capacitor (Cf).
The demo board can be powered from 1.2V to 2.5V. The output voltage can be controlled by the feedback resistor network. The feedback reference is 1.23V, so the output voltage can be calculated as 1.23*(R2+R1)/R2. To achieve at flexible operation, a disable terminal is designed to turn on or turn off the demo board output.
Specification
| Item | Value |
|---|---|
| Supply Voltage | 1.2 to 2.5V |
Output Current (Max.)
| 40mA@Vin=1.2V
50mA@Vin=1.5V
80mA@Vin=2.5V
Output Voltage| 3.3V±5%
Ripple & Noise (Max.)| 150mV
Efficiency (Typ.)
| 70%@ Vin=1.2V,Io=40mA
73％@Vin=1.5V,Io=50mA
81％@Vin=2.5V,Io=80mA
Schematic And PCB Layout
Schematic of the Demo Board
PCB Layout
Photo View of the Demo Board
PCB Dimensions
BOM
| Item | Quantity | Location | Part | Footprint |
|---|---|---|---|---|
| 1 | 1 | U1 | AP3015 | SOT23-5 |
| 2 | 1 | L | 10uF, Sumida: CDRH5D28RNP-100NC | SMD |
| 3 | 1 | Cin | 4.7uF, X7R Ceramic | 1206 |
| 4 | 1 | Cout1 | 10uF, X7R Ceramic | 1206 |
| 5 | 1 | Cf | 10pF, X7R Ceramic | 0805 |
| 6 | 1 | D | SS14, Schottky | SMD |
| 7 | 1 | R1 | 1M, 1% | 0805 |
| 8 | 1 | R2A | 1M, 1% | 0805 |
| 9 | 1 | R2B | 1.5M, 1% | 0805 |
| 10 | 2 | J1, J2 | 5 Pin Connector | SIP-5 |
| 11 | 1 | Cout2 | NC |
Test Result
Output Voltage
| Vin | Vout @ Iout=0mA | Vout @ Io=40mA | Vout @ Io= 50mA | Vout @ Io= 100mA |
|---|---|---|---|---|
| 1.2V | 3.299V | 3.185V | — | — |
| 1.5V | 3.302V | 3.225 | 3.189V | — |
| 2.5V | 3.324V | 3.302V | 3.289V | 3.218V |
Ripple & Noise
Efficiency
Note: The Max. Output Capability is 46mA @ Vin=1.2V, 55mA @Vin=1.5V and
125mA @Vin=2.5V.
The recommended maximum Output Capability is 40mA @ Vin=1.2V, 50mA @Vin=1.5V
and 100mA @Vin=2.5V.