SG3525M

@@ -0,0 +1,58 @@+# SG3525M++**HGSEMI** · AC-DC Controllers and Regulators · SOP-16++SG3525M from HGSEMI, 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 internal error amplifier. Typical input offset 1.5mV, bias current ~1µA, common-mode range up to VREF (5.1V). Used with the compensation pin to close the voltage-regulation loop. |+| 2 | Noninv. Input | input | Non-inverting input of the internal error amplifier. Common-mode range 1.5V to 5.2V, allowing direct connection to the on-chip 5.1V reference without an external divider. |+| 3 | Sync | bidirectional | Oscillator sync pin. Used to synchronize the internal oscillator to an external clock (threshold 1.2-2.8V, sink ~1.3mA at 3.5V) or to slave/master multiple SG3525s together. |+| 4 | OSC. Output | output | Oscillator clock output. Delivers a ~4V, 0.6µs-wide clock pulse per cycle, used for scope monitoring or as a sync source for downstream stages. |+| 5 | CT | passive | Timing capacitor pin. Connect CT to GND to set the oscillator frequency together with RT (e.g. RT=2kΩ, CT=470pF → ~400kHz; RT=200kΩ, CT=0.1µF → ~60Hz). |+| 6 | RT | passive | Timing resistor pin. Connect RT to GND to program the oscillator charging current (charging current up to 5mA) and hence frequency, in conjunction with CT. |+| 7 | Discharge | passive | CT discharge pin. A resistor placed between CT (pin 5) and Discharge sets the dead-time (blanking) between Output A and Output B pulses. |+| 8 | Soft-Start | passive | Soft-start capacitor pin. A ~50µA (typ 51µA, 25-80µA) internal source charges an external cap here to slowly ramp the PWM duty cycle at start-up; discharged low (<0.7V) during shutdown. |+| 9 | Compensation | output | Error-amplifier output / PWM comparator input. External RC network from this pin sets the loop compensation. PWM zero duty at ~0.9V, max duty (≥45%) at ~3.2V. |+| 10 | Shutdown | input | Active-high shutdown input. Driving this pin above ~0.8V (threshold 0.6-1.0V) inhibits both outputs and discharges the soft-start cap, providing pulse-by-pulse current limit or emergency shutdown. Input current ~0.3mA at 2.5V. |+| 11 | Output A | output | Totem-pole PWM output A. Sources/sinks >150mA (peak 400mA); VOH ≥18V at 20mA source, VOL ≤0.4V at 20mA sink. Alternates with Output B at half the oscillator frequency for push-pull/bridge drive. |+| 12 | Ground | power_in | Signal / logic ground return for the reference, oscillator and control circuitry. Tie to system ground; often decoupled separately from the VC power ground in switching supplies. |+| 13 | VC | power_in | Collector supply for the output totem-pole drivers. Absolute max 40V; usually tied to VCC or a separate driver rail sized for the gate-drive current (>150mA continuous). |+| 14 | Output B | output | Totem-pole PWM output B, complementary to Output A. Same drive characteristics (>150mA source/sink, 400mA peak). NOR-gated logic guarantees a low ('off') level during dead-time or shutdown. |+| 15 | VCC | power_in | Main chip supply. Operating range 8-35V with UVLO threshold ~7V (6-8V). Typical ICC 12mA, max 20mA at 35V. Decouple locally with 0.1µF. |+| 16 | Vref | power_out | Internal 5.1V ±1% reference output. Sources up to 20mA (short-circuit ~80mA). Decouple with 0.1µF to GND; can be used as bias for the error-amp non-inverting input. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | HGSEMI |+| Package | SOP-16 |+| Category | PMIC |+| Pins | 16 |++## Ordering variants++- `SG3525MM/TR`+- `SG3525MN`+- `SG3525MMT/TR`+- `SG3525MMS/TR`++## CAD (KiCad official)++- Symbol: `SG3525M`+- 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:** [HGSEMI datasheet](docs/sg3525m-datasheet.pdf) (9 pp, sha256 `5277772c8ab62d7b`, retrieved 2026-08-17, tier: lcsc)+- **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](docs/sg3525m-datasheet.pdf)

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