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3525

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IDCHIP DC-DC Converters, SOP-16. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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3525

IDCHIP · DC-DC Converters · SOP-16

3525 from IDCHIP, in a SOP-16. 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 Inv. Input input Inverting input of the error amplifier, whose common-mode range is +1.5 V to +5.2 V.
2 Noninv. Input input Non-inverting input of the error amplifier, whose common-mode range is +1.5 V to +5.2 V.
3 Sync input Synchronization input that locks the internal oscillator to an external clock or enables master/slave operation.
4 OSC Output output Oscillator output that provides the clock signal for synchronizing slave devices.
5 CT passive Oscillator timing capacitor, specified from 0.001 µF to 0.2 µF.
6 RT passive Oscillator timing resistor, specified from 2.0 kΩ to 150 kΩ.
7 Discharge passive Dead-time discharge pin connected to the dead-time resistor RD, which is specified from 0 Ω to 500 Ω.
8 Soft-Start passive Soft-start pin with a pull-up current source whose capacitor is discharged at about 100 µA during shutdown.
9 Compensation passive Error amplifier compensation pin with a pull-up current source; a pull-down of up to 100 µA shuts off the outputs.
10 Shutdown input Shutdown input in which a high level immediately latches the PWM and discharges the soft-start capacitor, and which must not be left floating.
11 Output A output Output A, a totem-pole driver rated for ±400 mA peak that alternates with Output B.
12 Ground power_in Ground return for the device.
13 VC power_in Output stage supply, specified from 4.5 V to 35 V.
14 Output B output Output B, a totem-pole driver rated for ±400 mA peak that alternates with Output A.
15 VCC power_in Supply voltage input, specified from 8.0 V to 35 V.
16 Vref power_out Reference output at 5.1 V ±1.0%, with a load current of 0 mA to 20 mA.

Key specifications

Parameter Value
Manufacturer IDCHIP
Package SOP-16
Category Power Management ICs
Pins 16

Electrical characteristics

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

Parameter Symbol Min Typ Max Unit Conditions Page
Absolute maximum VCC supply voltage VCC 40 Vdc 2
Absolute maximum collector supply voltage VC 40 Vdc 2
Absolute maximum logic input voltage -0.3 5.5 V 2
Absolute maximum analog input voltage -0.3 V to VCC 2
Absolute maximum output current IO -500 500 mA 2
Absolute maximum reference output current Iref 50 mA 2
Absolute maximum oscillator charging current 5 mA 2
Power dissipation PD 1000 mW TA = +25°C (derate 10 mW/°C above +50°C) 2
Power dissipation PD 2000 mW TC = +25°C (derate 16 mW/°C above +25°C case) 2
Thermal resistance junction to ambient RθJA 100 °C/W 2
Thermal resistance junction to case RθJC 60 °C/W 2
Operating junction temperature TJ 150 °C 2
Storage temperature range Tstg -55 125 °C 2
Soldering temperature TSolder 300 °C 10 seconds 2
Supply voltage VCC 8 35 Vdc 2
Collector supply voltage VC 4.5 35 Vdc 2
Output current IO 0 100 mA 2
Output current, peak IO 0 400 mA 2
Reference load current Iref 0 20 mA 2
Oscillator frequency range fosc 0.1 400 kHz 2
Timing resistor range RT 2 150 kΩ 2
Timing capacitor range CT 0.001 0.2 µF 2
Deadtime resistor range RD 0 500 Ω 2
Operating ambient temperature range TA 0 70 °C 2
Reference output voltage Vref 5 5.1 5.2 Vdc VCC = +20 V, TJ = +25°C 3
Line regulation Regline 10 20 mV +8.0 V ≤ VCC ≤ +35 V 3
Load regulation Regload 20 50 mV 0 mA ≤ IL ≤ 20 mA 3
Temperature stability of reference ΔVref/ΔT 20 mV 3
Short circuit current ISC 80 100 mA Vref = 0 V, TJ = +25°C 3
Output noise voltage Vn 40 200 µVrms 10 Hz ≤ f ≤ 10 kHz, TJ = +25°C 3
Long term stability S 20 50 mV/khr TJ = +125°C 3
Initial accuracy 2 6 % TJ = +25°C 3
Voltage frequency stability ΔfOSC/ΔVCC 1 2 % +8.0 V ≤ VCC ≤ +35 V 3
Temperature frequency stability ΔfOSC/ΔT 0.3 % 3
Minimum oscillator frequency fmin 50 Hz RT = 150 kΩ, CT = 0.2 µF 3
Maximum oscillator frequency fmax 400 kHz RT = 2.0 kΩ, CT = 1.0 nF 3
Oscillator charge current 1.7 2 2.2 mA IRT = 2.0 mA 3
Clock amplitude 3 3.5 V 3
Clock width 0.3 0.5 1 µs TJ = +25°C 3
Sync threshold 1.2 2 2.8 V 3
Sync input current 1 2.5 mA Sync Voltage = +3.5 V 3
Input offset voltage VIO 2 10 mV VCM = +5.1 V 3
Input bias current IIB 1 10 µA 3
Input offset current IIO 1 µA 3
DC open loop gain AVOL 60 75 dB RL ≥ 10 MΩ 3
Low level output voltage VOL 0.2 0.5 V 3
High level output voltage VOH 3.8 5.6 V 3
Common mode rejection ratio CMRR 60 75 dB +1.5 V ≤ VCM ≤ +5.2 V 3
Power supply rejection ratio PSRR 50 60 dB +8.0 V ≤ VCC ≤ +35 V 3
Minimum duty cycle DCmin 0 % 3
Maximum duty cycle DCmax 45 49 % 3
Input threshold at zero duty cycle Vth 0.6 0.9 V Note 6 3
Input threshold at maximum duty cycle Vth 3.3 3.6 V Note 6 3
PWM comparator input bias current IIB 0.05 1 µA 3
Soft-start current 25 50 80 µA V shutdown = 0 V 4
Soft-start voltage 0.4 0.6 V V shutdown = 2.0 V 4
Shutdown input current 0.4 1 mA V shutdown = 2.5 V 4
Output low level voltage VOL 0.2 0.4 V Each Output, VCC = +20 V, Isink = 20 mA 4
Output low level voltage VOL 1 2 V Each Output, VCC = +20 V, Isink = 100 mA 4
Output high level voltage VOH 18 19 V Each Output, VCC = +20 V, Isource = 20 mA 4
Output high level voltage VOH 17 18 V Each Output, VCC = +20 V, Isource = 100 mA 4
Undervoltage lockout threshold VUL 6 7 8 V V8 and V9 = High 4
Collector leakage current IC(leak) 200 µA VC = +35 V 4
Rise time tr 100 600 ns CL = 1.0 nF, TJ = 25°C 4
Fall time tf 50 300 ns CL = 1.0 nF, TJ = 25°C 4
Shutdown delay tds 0.2 0.5 µs VDS = +3.0 V, CS = 0, TJ = +25°C 4
Supply current ICC 14 20 mA VCC = +35 V 4

CAD (KiCad official)

  • Symbol: 3525
  • Footprint: Package_SO:SOIC-16_3.9x9.9mm_P1.27mm
  • 3D model: SOP-16 (KiCad packages3D, STEP)
  • 3D model files: 3525-etched.step / 3525-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); 3525.step / 3525.glb are the bare package body.

Provenance

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

  • Datasheet: IDCHIP datasheet (7 pp, sha256 da8d2eb9e542155d, retrieved 2026-10-28, tier: lcsc)
  • Datasheet language: Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
  • 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