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rt9277bgf

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Richtek Tech DC-DC Converters, MSOP-8. Datasheet-verified pinout, KiCad symbol/footprint/3D.

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Contents

README

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RT9277BGF

Richtek Tech · DC-DC Converters · MSOP-8

RT9277BGF from Richtek Tech, in a MSOP-8. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 COMP output Compensation pin for the internal error amplifier. Connect an external R-C compensation network (R3, C3, and optionally C4) from this pin to GND to set the loop response. Reference voltage at FB is 1.24V typical.
2 FB input Feedback input pin. Connect an external resistor divider from VOUT to FB to GND to program the output voltage. Typical internal reference voltage is 1.24V; VOUT = 1.24V x (1 + R1/R2).
3 EN input Shutdown/Enable control input. Drive EN high (VIH >= 0.7 x VIN) to enable the converter; drive to GND (VIL <= 0.3 x VIN) to shut the RT9277B off and reduce supply current to ~0.1μA. Hysteresis ~0.1V.
4 GND power_in Device ground return. Connect to the system ground plane with a low-impedance path close to the input and output capacitors.
5 LX power_out Switching node - drain of the internal N-channel power MOSFET (RDS(ON) ~200mΩ, 1.6A current limit, 16V rating). Connect the boost inductor and the anode of the catch (Schottky) diode to this pin. Keep the trace short and wide to minimize EMI.
6 VIN power_in Supply input, 2.5V to 5.5V operating range (absolute max 6V). Place at least a 1μF (typically 10μF) low-ESR ceramic bypass capacitor close to this pin. UVLO ~2V typical.
7 FREQ input Oscillator frequency select input. Tie to GND (or leave floating - internal 5μA pull-down) for 640kHz operation, or tie to VIN for 1.2MHz operation.
8 SS passive Soft-start control pin (RT9277B only). Connect an external soft-start capacitor CSS (typically 10nF to 200nF) from this pin to GND. A 4μA constant current charges CSS from 0V toward 1.24V, ramping the peak inductor current during startup. Discharged to GND when EN=GND. Leave floating to disable soft-start.

Key specifications

Parameter Value
Manufacturer Richtek Tech
Package MSOP-8
Category PMIC
Pins 8

Ordering variants

  • RT9277BGF

CAD (KiCad official)

  • Symbol: RT9277BGF
  • Footprint: Package_SO:MSOP-8_3x3mm_P0.65mm
  • 3D model: MSOP-8 (KiCad packages3D, STEP)

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: Richtek Tech datasheet (None pp, sha256 91bcb5a4f859944a, retrieved 2026-08-17, tier: manufacturer)
  • Extractor: ds2sf (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF

Symbol & Footprint

Schematic Symbol

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PCB Footprint

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Datasheet

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