AP63201WU-7 - 2A 32V Sync Buck Converter, 22uA Iq | Diodes Inc
MPN: AP63201WU-7 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0.98 | $0.98 |
| 10 | $0.86 | $8.60 |
| 100 | $0.72 | $72.00 |
| 500 | $0.61 | $305.00 |
| 1,000 | $0.54 | $540.00 |
| 3,000 | $0.45 | $1,350.00 |
AP63201WU-7 Overview
What is a synchronous buck converter? A synchronous buck is a switching voltage regulator that steps a higher DC input down to a lower regulated DC output. It replaces the conventional rectifier diode with a low-side MOSFET (the "synchronous" switch), which significantly lowers conduction losses and boosts efficiency at moderate to high loads. Synchronous buck converters are a subset of DC-DC converters within the power management IC family, and they are distinguished from LDOs by their ability to step down large input-to-outlet ratios with high efficiency (typically 85-95%) rather than dissipating the differential as heat.
Key features include an adjustable output voltage down to 0.8 V with ±1% reference accuracy, internal loop compensation (18 kΩ/7.6 nF), power-good indicator, thermal shutdown, cycle-by-cycle current limit, and a hiccup-mode overcurrent that recovers once the fault is cleared. The TSOT-26 footprint measures roughly 2.9 mm × 1.6 mm with an exposed thermal pad, enabling compact point-of-load designs.
The AP63201 uses peak-current-mode control with internal compensation, which simplifies the external BOM to only input/output capacitors and an inductor. Its 500 kHz switching frequency is high enough for small magnetics but low enough to keep switching losses manageable at 2 A continuous output. The 22 µA quiescent current makes it well suited to battery-powered or always-on subsystems that spend most of their time in standby.
Typical applications include 24 V industrial bus step-down to 3.3 V / 5 V / 1.8 V rails, FPGA/DSP/MCU core and I/O supplies, automotive infotainment and body electronics, distributed POL converters in telecom equipment, and general-purpose 12 V-to-low-voltage conversion in appliances and consumer devices.
When designing, place the input ceramic capacitor as close as possible to PVIN and PGND, keep the feedback trace away from the inductor, and use a 4-layer PCB with a solid ground plane for EMI. The exposed thermal pad must be soldered to a sufficiently large copper pour to keep junction temperature within the 150 °C shutdown limit.
This page synthesizes distributor pricing, same-family Diodes variants (AP63200/AP63203/AP63205), and drop-in cross-brand alternatives from web data, alongside practical design notes not found in the manufacturer datasheet alone.
Drop-in alternatives for AP63201WU-7 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with AP63201WU-7 (same form factor and footprint) — differing in Package, Protection Features, Quiescent Current, Switching Frequency, Topology.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
AP63200WU-7
✅ Drop-In✓ In Stock
$0.49 / Unit
View Datasheet →AP63203WU-7
✅ Drop-In✓ In Stock
$0.32 / Unit
View Datasheet →AP63205WU-7
✅ Drop-In✓ In Stock
$0.2036 / Unit
View Datasheet →AP63201WU-7
✅ Drop-In✓ In Stock
$0.45 / Unit
View Datasheet →LMR16006XDDCR
✅ Drop-In📋 Reference alternative (not in catalog)
TPS62150RGTR
✅ Drop-In📋 Reference alternative (not in catalog)
AP63201WU-7 Maximum Ratings & Electrical Characteristics
| Topology | Synchronous Buck (Step-Down) |
| Input Voltage Range | 3.8 V to 32 V |
| Continuous Output Current | 2 A |
| Output Voltage Range | 0.8 V to VIN (Adjustable) |
| Reference Voltage Accuracy | 0.8 V ±1% |
| Switching Frequency | 500 kHz (fixed) |
| High-Side MOSFET RDS(on) | 125 mΩ |
| Low-Side MOSFET RDS(on) | 68 mΩ |
| Quiescent Current | 22 µA (ultralow Iq) |
| Light-Load Efficiency | Up to 80% at 1 mA, 88% at 5 mA |
| Light-Load Mode | PFM (AP63201 only) |
| Control Method | Peak Current Mode with Internal Compensation |
| Package | TSOT-26 (TSOT-23-6 Thin) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
AP63201WU-7 Pin Configuration
| Pin 1 | EN — Enable input (active-high, internally pulled down). Drive high to enable the converter. |
| Pin 2 | GND — Analog ground / signal ground return for the feedback divider and reference. |
| Pin 3 | SW — Switch node - connection point of the high-side and low-side MOSFET drains. Connect to the output inductor. |
| Pin 4 | FB — Feedback input. Connect to the external resistor divider between VOUT and GND. |
| Pin 5 | PGND — Power ground return for the low-side MOSFET. Connect to a wide ground copper pour. |
| Pin 6 | PVIN — Power input supply. Decouple with a 1 µF / 10 µF ceramic capacitor placed as close as possible. |
Typical Applications
AP63201WU-7 is suitable for 6 applications: FPGA/DSP Core and I/O Point-of-Load Rails, 24 V Industrial Bus to 5 V / 3.3 V Conversion, Automotive 12 V Body and Infotainment Electronics, Distributed POL Converters in Telecom Equipment, Portable Battery-Powered Devices and Wearables, General-Purpose 12 V / 24 V to Low-Voltage DC/DC Conversion.
FPGA/DSP Core and I/O Point-of-Load Rails
The AP63201WU-7 fits FPGA and DSP POL conversion due to its 3.8-32 V input and 2 A continuous output with 0.8 V ±1% reference accuracy. The 500 kHz switching frequency is low enough for low-noise analog rails, and the internal compensation eliminates the compensation-network engineering that PEEC models would otherwise require. Placed between a 12 V or 24 V upstream rail and the FPGA core (1.0-1.8 V) or I/O (3.3 V) domain, the part delivers predictable output across the full 2 A range with a footprint under 50 mm². The 22 µA quiescent current also benefits standby/hibernate modes in low-power FPGAs.
Recommended
24 V Industrial Bus to 5 V / 3.3 V Conversion
The AP63201WU-7 is well-suited for 24 V industrial bus step-down because of its 32 V max input rating with 7 V over-voltage headroom and 2 A output capability. The part converts 24 V nominal (with transients to 36 V) to 5 V or 3.3 V logic rails for sensors, PLCs, and motor-control subsystems. Internal loop compensation eliminates the 18 kΩ / 7.6 nF RC design step that competitors expose externally. The synchronous topology sustains 88-92% efficiency at moderate loads, keeping thermal dissipation manageable in sealed IP65 enclosures where ambient air temperatures exist.
Recommended
Automotive 12 V Body and Infotainment Electronics
The AP63201WU-7 supports 12 V automotive body and infotainment designs thanks to its 32 V load-dump tolerance and enhanced EMI-reduction architecture that aids CISPR 25 compliance. The part regulates 12 V (with cold-crank dips to 4 V handled by the 3.8 V minimum) to 3.3 V or 5 V rails for infotainment head units, instrument clusters, and body controllers. Its 22 µA quiescent current is critical for parked-vehicle standby budgets where quiescent draw is regulated. PFM at light load extends battery life during the long parked state. Note: AEC-Q100 grade is not explicitly stated in the verified data - AEC-Q100 should be confirmed before automotive deployment.
Recommended
Distributed POL Converters in Telecom Equipment
The AP63201WU-7 fits telecom distributed POL because of its 2 A output and 32 V input tolerance for 24 V/48 V telecom bus architectures. The part is deployed at the board edge of line cards, baseband units, and small-cell radios, converting -48 V brick outputs to 3.3 V or 1.8 V for digital logic. The synchronous topology delivers 90-93% efficiency at full output, which is essential to meet the 1000-2000 W per rack thermal budget. Integrated 125 mΩ / 68 mΩ MOSFETs reduce BOM count versus controller+FET discrete designs.
Recommended
Portable Battery-Powered Devices and Wearables
The AP63201WU-7 supports portable and battery-powered applications thanks to its 22 µA ultra-low quiescent current and PFM mode at light load. The part extends standby runtime for always-on subsystems such as IoT sensor hubs, BLE wearables, and e-reader main boards that spend most of their life in low-power states. Input range of 3.8-32 V accommodates single-cell Li-ion (3.0-4.2 V), 2-cell Li-ion (6.0-8.4 V), and even USB-C PD 20 V input rails. The 6-pin TSOT-26 footprint is well-suited to wearables where PCB area is reduced.
Recommended
General-Purpose 12 V / 24 V to Low-Voltage DC/DC Conversion
The AP63201WU-7 fits general-purpose appliance and consumer conversion where 12 V or 24 V is available and 5 V / 3.3 V / 1.8 V logic rails are needed. The part is found in smart-home hubs, white-goods control boards, and HVAC thermostats where 24 VAC-derived DC buses feed digital logic. The integrated compensation network, soft-start, and power-good indicator simplify firmware and hardware co-design, enabling faster time-to-market. The 500 kHz frequency is high enough to avoid audible noise but low enough to keep EMI filter cost low.
Recommended
Recommended Products Summary
Engineering reference data for AP63201WU-7 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | AP63200WU-7 | AP63203WU-7 | AP63205WU-7 | LMR16006XDDCR |
|---|---|---|---|---|---|
| Brand | Diodes Incorporated | Diodes Incorporated | Diodes Incorporated | Diodes Incorporated | Texas Instruments |
| Package | TSOT-26 (TSOT-23-6 Thin) | TSOT-26 (TSOT-23-6 Thin) - same | TSOT-26 (TSOT-23-6 Thin) - same | TSOT-26 (TSOT-23-6 Thin) - same | TSOT-23-6 Thin - same footprint family |
| Input Voltage Range | 3.8 V to 32 V | 3.8 V to 32 V | 3.8 V to 32 V | 3.8 V to 32 V | 4 V to 60 V |
| Output Current | 2 A | 2 A | 2 A | 2 A | 0.6 A |
| Switching Frequency | 500 kHz | 500 kHz | 1.1 MHz | 1.1 MHz | up to 2.1 MHz (adjustable) |
| Quiescent Current | 22 µA | 22 µA | 22 µA | 22 µA | 28 µA (typical) |
| Light-Load Mode | PFM | PWM only | PFM | PWM only | PWM only |
| High-Side MOSFET RDS(on) | 125 mΩ | 125 mΩ | 125 mΩ | 125 mΩ | 500 mΩ (typ, higher) |
| Reference Voltage | 0.8 V ±1% | 0.8 V ±1% | 0.8 V ±1% | 0.8 V ±1% | 0.8 V ±2% |
| Internal Compensation | Yes (18 kΩ / 7.6 nF) | Yes | Yes | Yes | Yes |
Key Differentiators
- PFM at light load for higher 1-10 mA efficiency (vs AP63200WU-7)
- Lower quiescent current for always-on subsystems (vs LMR16006XDDCR (TI))
- Wider VIN range for 24 V industrial bus tolerance (vs TPS62150RGTR (TI))
Design Notes
Place a 1 µF / 10 µF ceramic input capacitor as close as possible to PVIN and PGND to minimize switching-node ringing. The exposed thermal pad must be soldered to a ground copper pour of at least 50 mm² to keep junction temperature within the 150 °C thermal shutdown limit at 2 A continuous output. Use a 4-layer PCB with a dedicated ground layer to suppress EMI.
Keep the FB trace short and routed away from the SW node and inductor to avoid noise coupling that corrupts output-voltage regulation. Use a Kelvin sense connection at the top of the output capacitor for the FB divider rather than at the inductor. The PGND and GND pins should be tied together at the exposed pad, not at the schematic level, to avoid ground bounce at the SW transitions.
Do not exceed 32 V on PVIN even during transient load-dump events - use a TVS clamp if the source is automotive. Do not operate below 3.8 V on PVIN or the undervoltage lockout will trigger. The output inductor must be sized for 2 A saturation (use a 4.7 µH with 3 A Isat minimum); undersized inductors saturate and trip cycle-by-cycle current limit. Ensure the output capacitor ESR is below 30 mΩ for stable loop response.
Estimated: at VIN=24 V, VOUT=5 V, IOUT=2 A, and 90% efficiency, the AP63201WU-7 dissipates approximately (24-5)*2/0.9 - 5*2 ≈ 4.2 W. With TSOT-26 θJA of approximately 60-70 °C/W on a 50 mm² copper pour, the junction temperature rise is around 250-290 °C above ambient, which would exceed thermal shutdown. Reduce VIN or improve PCB copper area to sustain 2 A continuous output at high VIN.
Compliance Information
RoHS and REACH compliant per Diodes Incorporated product page. The AP63201WU-7 is not AEC-Q100 qualified - for AEC-Q100 needs evaluate AP63200AWU-7 or AP63300QWU-7 family members. Halogen-free per JEDEC JS709.
