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AP1534 / AP1534SG-13 Step-Down PWM Switching Regulator — SOP-8, 4.75–23V, 1.5A (5-Pack)
AP1534 / AP1534SG-13 Step-Down PWM Switching Regulator SOP-8, 4.75–23V, 1.5A (5-Pack)
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AP1534 / AP1534SG-13 Step-Down PWM Switching Regulator — SOP-8, 4.75–23V, 1.5A (5-Pack)
The AP1534 (AP1534SG-13) is a current-mode PWM step-down (buck) switching regulator IC in a SOP-8 SMD package. Operating from 4.75V to 23V input with up to 1.5A output current and 90% peak efficiency at 150kHz switching frequency, it is a compact and efficient solution for DC-DC voltage step-down in consumer electronics, industrial equipment, and embedded power supply designs. The internal 1.5A switch eliminates the need for an external power transistor.
Key Specifications
| Parameter | Value |
|---|---|
| Package | SOP-8 (SMD) |
| Input Voltage Range | 4.75V – 23V |
| Output Current | 1.5A (internal switch) |
| Switching Frequency | 150kHz (fixed) |
| Peak Efficiency | ~90% |
| Output Voltage | Adjustable (external resistor divider) |
| Reference Voltage | 1.25V (internal) |
| Protection | OCP, thermal shutdown, soft-start |
| Operating Temperature | -40°C to +85°C |
| Quantity | 5 pieces |
Why Choose AP1534?
- 4.75–23V input range — covers 5V USB, 9V, 12V, and 19V laptop adapter inputs
- 1.5A internal switch — no external power transistor needed for loads up to ~1A output
- 90% peak efficiency — significantly less heat than linear regulators (LM7805, LM317) at the same voltage/current
- 150kHz switching — allows compact inductor and capacitor values
- SOP-8 compact package — minimal PCB footprint for space-constrained designs
AP1534 vs Common Alternatives
| IC | Input Voltage | Output Current | Frequency | Package |
|---|---|---|---|---|
| AP1534 | 4.75–23V | 1.5A | 150kHz | SOP-8 |
| LM2596 | 4.5–40V | 3A | 150kHz | TO-263/DIP-8 |
| MP2307 | 4.75–23V | 3A | 340kHz | SOP-8 |
| XL4005 | 5–32V | 5A | 300kHz | SOP-8 |
Compatible With / Common Use Cases
- 12V to 5V buck: Power Arduino, Raspberry Pi, or ESP32 from 12V supply
- 19V laptop adapter to 12V: Step down laptop charger output for 12V peripherals
- 9V to 3.3V: Two-stage regulation (9V→5V→3.3V) for MCU power supply
- Industrial 24V to 5V: Logic supply from 24V industrial rail (note: 23V max input)
- PCB repair: Replacement for failed SOP-8 buck regulator ICs on consumer electronics boards
Frequently Asked Questions
Q: How do I set the output voltage for AP1534?
A: Use a resistor divider from Vout to the feedback (FB) pin to GND. Vout = 1.25V × (1 + R1/R2). For 5V output: R1=30kΩ, R2=10kΩ gives Vout = 1.25 × 4 = 5V. For 3.3V: R1=16.2kΩ, R2=10kΩ gives Vout ≈ 3.3V. Use 1% tolerance resistors for accurate output voltage.
Q: What inductor value should I use with AP1534?
A: For 12V input, 5V output, 1A load at 150kHz: L = (Vin − Vout) × D / (f × ΔIL) where D = Vout/Vin = 0.42, ΔIL = 30% of Iout = 0.3A. L ≈ (12−5) × 0.42 / (150kHz × 0.3A) ≈ 65μH. Use a 68μH or 100μH shielded inductor rated for ≥1.5A.
Q: Can AP1534 replace LM2596 in an existing design?
A: The AP1534 has the same 150kHz switching frequency and similar topology as LM2596, but different pinout and lower max input voltage (23V vs 40V). Do not substitute directly without verifying pinout compatibility and input voltage requirements.
Package Contents
- 5× AP1534 / AP1534SG-13 Step-Down PWM Switching Regulator IC (SOP-8)
