component

RT7251AZQW

Public Made by Adom

by adom

Richtek Tech DC-DC Converters, WSON-8-EP(2x2). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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RT7251AZQW

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.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); rt7251azqw.step / rt7251azqw.glb are 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, primary claude-sonnet-5-5 (text), consensus claude-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).

Datasheet PDF