component
RT7251AZQW
Public Made by Adomby adom
Richtek Tech DC-DC Converters, WSON-8-EP(2x2). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdownRT7251AZQW
Richtek Tech · DC-DC Converters · WSON-8-EP(2x2)
RT7251AZQW from Richtek Tech, in a WSON-8-EP(2x2). Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.
Pinout
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | SW | passive | Switch node that connects to the external L-C filter. |
| 2 | VIN | power_in | Input supply voltage (4V to 17V operating, -0.3V to 19V absolute maximum) that must be bypassed with a suitably large ceramic capacitor. |
| 3 | BOOT | passive | Bootstrap for the high-side gate driver; connect a 0.01μF or greater ceramic capacitor from BOOT to SW. |
| 4 | EN | input | Chip enable where logic-high enables the converter and logic-low forces shutdown with supply current below 5μA; tie to VIN through a 100kΩ pull-up resistor for automatic startup. |
| 5 | FB | input | Feedback input to which the external resistive divider connects for an adjustable output (0.8V typ. reference). |
| 6 | PGOOD | output | Open-drain power good indicator that is pulled low if the output voltage is 12.5% less than the nominal voltage. |
| 7 | GND | power_in | Ground pin. |
| 8 | GND | power_in | Ground pin. |
| 9 | GND | power_in | Exposed pad ground that must be soldered to a large PCB and connected to GND for maximum power dissipation. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Richtek Tech |
| Package | WSON-8-EP(2x2) |
| Category | Power Management ICs |
| Pins | 9 |
Electrical characteristics
Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).
| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Shutdown Supply Current | ISHDN | 1 | 5 | μA | VEN = 0V | 4 | |
| Supply Current | IOUT | 0.6 | 1 | mA | VEN = 3V, VFB = 0.9V | 4 | |
| Feedback Reference Voltage | VFB | 0.788 | 0.8 | 0.812 | V | 4V ≤ VIN ≤ 17V | 4 |
| Oscillation Frequency (RT7251A) | fOSC1 | 300 | 340 | 380 | kHz | For RT7251A | 4 |
| EN Threshold Logic-High Voltage | VIH | 2.5 | V | 5 | |||
| EN Threshold Logic-Low Voltage | VIL | 0.4 | V | 5 | |||
| Supply Input Voltage | VIN | 4 | 17 | V | 4 | ||
| Junction Temperature Range | TJ | -40 | 125 | °C | 4 | ||
| Ambient Temperature Range | TA | -40 | 85 | °C | 4 | ||
| Supply Voltage | VIN | -0.3 | 19 | V | 4 | ||
| SW Voltage | SW | -0.3 | V | Max is VIN + 0.3V | 4 | ||
| BOOT to SW | -0.3 | 6 | V | 4 | |||
| All Other Pins | -0.3 | 6 | V | 4 | |||
| Power Dissipation | PD | 0.833 | W | TA = 25°C, WDFN-8L 2x2 | 4 | ||
| Lead Temperature | 260 | °C | Soldering, 10 sec. | 4 | |||
| Junction Temperature | TJ | 150 | °C | 4 | |||
| Storage Temperature Range | -65 | 150 | °C | 4 | |||
| ESD HBM | 2 | kV | Human Body Mode | 4 | |||
| ESD MM | 200 | V | Machine Mode | 4 | |||
| Thermal Resistance Junction to Ambient | θJA | 120 | °C/W | WDFN-8L 2x2, JEDEC 51-7 four-layer board | 4 | ||
| Thermal Resistance Junction to Case | θJC | 8.2 | °C/W | WDFN-8L 2x2, at exposed pad | 4 | ||
| Feedback Current | IFB | 10 | nA | VFB = 0.8V | 4 | ||
| High Side Switch On Resistance | RDS(ON)1 | 145 | mΩ | 4 | |||
| Low Side Switch On Resistance | RDS(ON)2 | 140 | mΩ | 4 | |||
| Short-Circuit Oscillation Frequency | fOSC2 | 95 | kHz | VFB = 0V, For RT7251A | 4 | ||
| Maximum Duty Cycle | DMAX | 93 | % | VFB = 0.7V, For RT7251A | 4 |
CAD (KiCad official)
- Symbol:
RT7251AZQW - Footprint:
Package_SON:WSON-8-1EP_2x2mm_P0.5mm_EP0.9x1.6mm - 3D model: WSON-8-EP(2x2) (KiCad packages3D, STEP)
- 3D model files:
rt7251azqw-etched.step/rt7251azqw-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);rt7251azqw.step/rt7251azqw.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Richtek Tech datasheet (14 pp, sha256
7d27605e9d836e5d, retrieved 2026-10-24, tier: manufacturer) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-sonnet-5-5(text), consensusclaude-sonnet-5-5(agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish. - CAD: KiCad official libraries (CC-BY-SA 4.0).