component

NCP1521BSNT1G

Public Made by Adom

by adom

onsemi DC-DC Converters, TSOP-5. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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NCP1521BSNT1G

onsemi · DC-DC Converters · TSOP-5

NCP1521BSNT1G from onsemi, in a TSOP-5. 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 supply input (2.7 V to 5.5 V) for the PFET power stage, analog and digital blocks; must be decoupled to ground by a 4.7 µF ceramic capacitor.
2 GND power_in Ground reference for the NFET power stage and analog section of the IC; must be connected to the system ground.
3 EN input Active-HIGH enable for the switching regulator (VIH min 1.2 V, VIL max 0.4 V); turned off by logic LOW, do not let this pin float.
4 FB input Feedback voltage from the output of the power supply (0.6 V threshold) and input to the error amplifier.
5 LX output Connection from the power MOSFETs to the inductor.

Key specifications

Parameter Value
Manufacturer onsemi
Package TSOP-5
Category Power Management ICs
Pins 5

Electrical characteristics

Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).

Parameter Symbol Min Typ Max Unit Conditions Page
Input Voltage Range VIN 2.7 5.5 V 4
Quiescent Current, PFM No Switching Iq ON 30 45 µA 4
Standby Current, EN Low Iq OFF 0.2 1.5 µA 4
Undervoltage Lockout (VIN Falling) VUVLO 2.2 2.4 2.55 V VIN falling 4
EN Input High Voltage Threshold VIH 1.2 V Positive going, EN0 signal 4
EN Input Low Voltage Threshold VIL 0.4 V Negative going, EN0 signal 4
Output Voltage Accuracy, Overtemperature Range VOUT -3 3 % Overtemperature range 4
Output Voltage Accuracy, Ambient Temperature VOUT 1 % Ambient temperature 4
Oscillator Frequency FOSC 1.3 1.5 1.8 MHz 4
Soft-Start Time TSTART 320 500 µs 4
Duty Cycle 100 % 4
EN High Input Current IENH 2 µA EN = 3.6 V 4
Feedback Voltage Threshold VFB 0.6 V 4
Peak Inductor Current ILIM 1200 mA 4
Thermal Shutdown Threshold TSD 160 °C 4
Thermal Shutdown Hysteresis TSDH 25 °C 4
P-Channel On-Resistance RLxH 400 mΩ 4
N-Channel On-Resistance RLxL 400 mΩ 4
Minimum Voltage All Pins Vmin -0.3 V 3
Maximum Voltage All Pins Vmax 7 V Note 2 3
Thermal Resistance, Junction-to-Air TSOP5 RθJA 300 °C/W With recommended soldering footprint 3
Operating Ambient Temperature Range TA -40 85 °C 3
Storage Temperature Range Tstg -55 150 °C 3
Junction Operating Temperature Tj -40 125 °C 3
Latch-up Current Maximum Rating Lu 100 mA TA = 85°C 3
ESD Withstand Voltage, Human Body Model Vesd 2 kV HBM 3
ESD Withstand Voltage, Machine Model Vesd 200 V MM 3

CAD (KiCad official)

  • Symbol: NCP1521BSNT1G
  • Footprint: Package_SO:TSOP-5_1.65x3.05mm_P0.95mm
  • 3D model: TSOP-5 (KiCad packages3D, STEP)
  • 3D model files: ncp1521bsnt1g-etched.step / ncp1521bsnt1g-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); ncp1521bsnt1g.step / ncp1521bsnt1g.glb are the bare package body.

Provenance

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

  • Datasheet: onsemi datasheet (14 pp, sha256 12e57b75084beb7e, retrieved 2026-10-26, 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