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XC9271B085QR-G

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Torex Semicon DC-DC Converters, ESOP-8. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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XC9271B085QR-G

Torex Semicon · DC-DC Converters · ESOP-8

XC9271B085QR-G from Torex Semicon, in a ESOP-8. 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 VIN power_in Power input for the IC, with an operating voltage range of 7V to 30V and an absolute maximum VIN pin voltage of -0.3V to +36V.
2 CE input Chip enable: L selects stand-by and H selects active operation, with CE 'H' voltage 2.8V to 30V and 'L' voltage up to 1V, and the pin must not be left open.
3 SYNC input External clock sync pin: L runs at the internal clock frequency and H with a CLK signal synchronizes to an external clock within ±25% of the free running frequency, and the pin must not be left open.
4 FB input Output voltage sense input referenced to a 0.8V (±2%) reference, with the output adjustable from 1.2V to 12V via external resistors and an absolute maximum pin voltage of -0.3V to +6.5V.
5 SS passive Soft-start adjustment pin where the soft-start time is set by an external capacitor, with an absolute maximum pin voltage of -0.3V to +6.5V.
6 GND power_in Ground reference for all voltages in the datasheet; the dissipation pad must be connected to this pin (No. 6).
7 BST passive Bootstrap pin that drives the internal Nch driver transistor, with an absolute maximum voltage of VLX+6.5V or +36V and a minimum of VLX-0.3V.
8 Lx output Switching output pin with a maximum Lx pin current of 4.2A and an absolute maximum voltage of -0.3V to VIN+0.3V or +36V.
9 EP passive Exposed pad (from the footprint; not named in the datasheet pin table).

Key specifications

Parameter Value
Manufacturer Torex Semicon
Package ESOP-8
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
FB Voltage VFB1 0.784 0.8 0.816 V VFB=0.816V→0.784V, VSS=6V 9
FB Voltage Temperature Characteristics ΔVFB/(ΔTopr·VFB) -50 50 ppm/℃ -40℃≦Topr≦105℃ 9
Output Voltage Setting Range VOUTSET 1.2 12 V 9
Operating Voltage Range VIN 7 30 V 9
UVLO detect voltage VUVLO1 4.3 4.6 4.9 V VIN=4.9V→4.3V, VFB=0.65V, VSS=6V 9
UVLO release voltage VUVLO2 4.7 5 5.3 V VIN=4.7V→5.3V, VFB=0.65V, VSS=6V 9
Quiescent Current Iq 250 360 μA VIN=VCE=30V, VFB=0.95V 9
Stand-by Current ISTB 0.01 0.1 μA VIN=30V, VCE=0V, VSS=0V, VSYNC=0V 9
Oscillation Frequency fOSC 460 500 540 kHz Connected to external components, IOUT=300mA 9
External Clock Signal Duty Cycle DSYNC 25 75 % Connected to external components, IOUT=0mA 9
Maximum Duty Cycle DMAX 83 85 88 % VFB=0.65V 9
Minimum Duty Cycle DMIN 0 % VFB=0.95V 9
PFM Switch Current IPFM 80 160 240 mA Connected to external components, IOUT=0mA 9
Current Limit ILIM 2.4 3.2 A VFB=0.65V, VSS=6V 9
Short Detect Voltage VSHORT 0.35 0.4 0.45 V VFB=0.45V→0.35V, VSS=6V 9
Internal Soft-Start Time tSS1 0.4 0.7 1.2 ms VCE=0→12V, VSS=6V, VFB=VFB1×0.9V 9
External Soft-Start Time tSS2 5 9 15 ms VCE=0→12V, VSS=6V, VFB=VFB1×0.9V, CSS=0.01μF 9
SYNC 'H' Voltage VSYNCH 1.5 6 V Connected to external components, IOUT=0mA 9
SYNC 'L' Voltage VSYNCL 0.4 V Connected to external components, IOUT=0mA 9
SYNC 'H' Current ISYNCH -0.1 0 0.1 μA VIN=VCE=30V, VSYNC=6V, VFB=0.95V 9
SYNC 'L' Current ISYNCL -0.1 0 0.1 μA VIN=VCE=30V, VSYNC=0V, VFB=0.95V 9
FB 'H' Current IFBH -0.1 0 0.1 μA VIN=VCE=30V, VFB=6V, VSS=6V 9
FB 'L' Current IFBL -0.1 0 0.1 μA VIN=VCE=30V, VFB=0V, VSS=6V 9
CE 'H' Voltage VCEH 2.8 30 V VCE=0.8V→2.8V, VFB=0.65V, VSS=6V 9
CE 'L' Voltage VCEL 1 V VCE=2.8V→0.8V, VFB=0.65V, VSS=6V 9
CE 'H' Current ICEH -0.1 0 0.1 μA VIN=VCE=30V, VFB=0.95V 9
CE 'L' Current ICEL -0.1 0 0.1 μA VIN=30V, VCE=0V, VFB=0.95V 9
VIN Pin Voltage VIN -0.3 36 V 5
FB Pin Voltage VFB -0.3 6.5 V 5
SYNC Pin Voltage VSYNC -0.3 6.5 V 5
CE Pin Voltage VCE -0.3 36 V 5
SS Pin Voltage VCSS -0.3 6.5 V 5
Lx Pin Current ILx 4.2 A 5
Power Dissipation Pd 300 mW Ta=25℃ 5
Power Dissipation (40mm x 40mm standard board) Pd 1500 mW Ta=25℃, PCB mounted, reference only 5
Power Dissipation (JESD51-7 board) Pd 2500 mW Ta=25℃, PCB mounted, reference only 5
Surge Voltage VSURGE 46 V Applied Time≦400ms 5
Operating Ambient Temperature Topr -40 105 ℃ 5
Storage Temperature Tstg -55 125 ℃ 5

CAD (KiCad official)

  • Symbol: XC9271B085QR-G
  • Footprint: Package_SO:SOIC-8-1EP_3.9x4.9mm_P1.27mm_EP2.41x3.3mm
  • 3D model: ESOP-8 (KiCad packages3D, STEP)
  • 3D model files: xc9271b085qr-g-etched.step / xc9271b085qr-g-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); xc9271b085qr-g.step / xc9271b085qr-g.glb are the bare package body.

Provenance

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

  • Datasheet: Torex Semicon datasheet (28 pp, sha256 0fef93816d292884, retrieved 2026-10-29, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-haiku-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