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SG3525A

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by Ray

IDCHIP AC-DC Controllers and Regulators, SOP-16. Datasheet-verified pinout, KiCad symbol/footprint/3D.

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Contents

README

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SG3525A

IDCHIP · AC-DC Controllers and Regulators · SOP-16

SG3525A from IDCHIP, in a SOP-16. 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 Inv. Input input Inverting input of the on-chip error amplifier. Common-mode range 1.5 V to 5.2 V (covers the internal Vref = 5.1 V so no external resistor divider is required for reference-based feedback). Input offset 2 mV typ, input bias 1 µA typ.
2 Noninv. Input input Non-inverting input of the on-chip error amplifier. Common-mode range 1.5 V to 5.2 V; open-loop gain 75 dB typ, CMRR 75 dB typ, PSRR 60 dB typ.
3 Sync bidirectional Oscillator sync pin - can be driven by an external clock (~3.5 V, ~1 mA typ, 2.0 V threshold typ) to synchronize the SG3525A to a master clock, or used as a master output to slave additional devices.
4 OSC. Output output Oscillator clock output (3.0-3.5 V amplitude typ). Provides a buffered version of the internal clock for external monitoring or slaving other devices.
5 CT passive Oscillator timing capacitor connection. Recommended range 0.001 µF to 0.2 µF. Together with RT and RD sets oscillator frequency (100 Hz to 400 kHz).
6 RT passive Oscillator timing resistor connection. Recommended range 2.0 kΩ to 150 kΩ. Sets oscillator charging current (2.0 mA typ at IRT = 2.0 mA).
7 Discharge passive Oscillator discharge / dead-time pin. External resistor RD (0 to 500 Ω) between CT (pin 5) and Discharge sets the dead-time (blanking interval) between the two outputs.
8 Soft-Start passive Soft-start capacitor connection. Internal 50 µA current source charges an external capacitor at power-up to ramp the PWM duty cycle from 0 % to maximum, giving controlled start-up. Soft-start current 25-80 µA (50 µA typ).
9 Compensation output Error-amplifier output / PWM comparator input; loop-compensation node. Connect RC network here for feedback loop shaping. PWM comparator thresholds: 0.9 V (zero duty) to 3.3 V (max duty).
10 Shutdown input Active-high shutdown input. A high level (>2.0 V) immediately latches both outputs off via the PWM latch and begins discharging the soft-start capacitor (~100 µA). Should not be left floating due to noise-coupling risk. Input current 0.4 mA typ at 2.5 V.
11 Output A output Totem-pole PWM output A (one of two alternating outputs). ±400 mA peak drive; VOH ≈ 18 V and VOL ≈ 0.2 V at 20 mA (VCC = 20 V). Rise/fall times ~100/50 ns typ into 1 nF. Drives MOSFET gates or bipolar bases directly.
12 Ground power_in Signal and power ground return for the device.
13 VC power_in Output-stage collector supply (separate from VCC). Recommended range 4.5 V to 35 V; allows the output-driver rail to be sourced from a different supply than the control-section VCC.
14 Output B output Totem-pole PWM output B (alternates with Output A each oscillator cycle). ±400 mA peak drive; same VOH/VOL and switching characteristics as Output A.
15 VCC power_in Main IC supply. Recommended range 8.0 V to 35 V (absolute max 40 V). Under-voltage lockout trips at 6.0-8.0 V (7.0 V typ). Supply current ~14 mA typ at VCC = 35 V.
16 Vref power_out Internal 5.1 V ± 1 % voltage reference output. Rated 0-20 mA load; short-circuit current 80 mA typ. Bypass with 0.1 µF to ground; may be tied to error-amp input for reference-based feedback.

Key specifications

Parameter Value
Manufacturer IDCHIP
Package SOP-16
Category PMIC
Pins 16

Ordering variants

Same part, different packaging or reel option.

  • SG3525ADW
  • SG3525AN
  • SG3527AN

CAD (KiCad official)

  • Symbol: SG3525A
  • Footprint: Package_SO:SOIC-16_3.9x9.9mm_P1.27mm
  • 3D model: SOP-16 (KiCad packages3D, STEP)

Provenance

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

  • Datasheet: IDCHIP datasheet (7 pp, sha256 7bf1f64c1c7ad0d3, retrieved 2026-08-17, 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: 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