MC34063A

@@ -0,0 +1,52 @@+# MC34063A++**Texas Instruments** · DC-DC converter controller · SOIC-8++A complete DC-DC converter control circuit in SOIC-8, one of the oldest and most widely used switching-regulator chips. On board it has a temperature-compensated reference, a comparator, an oscillator whose frequency a single capacitor sets, a current-limit sense, a driver, and a 1.5 A output switch. With a handful of external parts (inductor, diode, resistors) it builds a step-down (buck), step-up (boost), or voltage-inverting converter over a 3 to 40 V input. It is the go-to for a cheap adjustable boost or buck when an integrated-inductor module is overkill.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | Switch Collector | output | High-current internal switch (Q1) collector. Rated 40 V max, up to 1.5 A peak switch current. Connects to the inductor/diode node of the boost/buck/inverting converter. |+| 2 | Switch Emitter | output | High-current internal switch (Q1) emitter output. Rated 40 V max. Combined with pin 1 forms the internal Darlington output switch used to drive the converter's power inductor. |+| 3 | Timing Capacitor | passive | Oscillator timing capacitor (C_T) pin. An external capacitor to GND sets the oscillator frequency (up to 100 kHz). Charge current typ. 35 uA, discharge typ. 220 uA, giving discharge/charge ratio ~6.5. |+| 4 | GND | power_in | Device ground reference. On the DRJ (QFN) package the exposed thermal pad is bonded internally to this pin. |+| 5 | Comparator Inverting Input | input | Inverting input to the internal error comparator. Non-inverting input is internally tied to the 1.25-V (typ.) reference. Connect a resistor divider from Vout to set the regulated output voltage. Input bias current typ. -20 nA (max -400 nA). Absolute range -0.3 V to 40 V. |+| 6 | VCC | power_in | Logic supply voltage. Tie to VIN. Operating range 3 V to 40 V (absolute max 40 V). Standby supply current typ. ~2.5 mA (max 4 mA at 5 V, C_T = 1 nF). |+| 7 | Ipk Sense | input | Current-limit sense input. An external resistor (Rsc) between VCC (pin 6) and this pin sets the peak switch current; the internal circuit terminates the switch on-time when the voltage across Rsc reaches ~300 mV (typ., 250-350 mV). |+| 8 | Driver Collector | output | Darlington driver transistor (Q2) collector input. Provides access to the driver stage for external switch configurations or Darlington operation (tie to pin 1 for internal Darlington). Rated 40 V max, driver collector current 100 mA max. |++## Key specifications++| Parameter | Value |+|---|---|+| Type | DC-DC converter controller |+| Topologies | buck, boost, inverting |+| Switch current | 1.5 A (on-chip) |+| Input voltage | 3-40 V |+| Oscillator | set by one capacitor (up to 100 kHz) |+| Reference | 1.25 V |+| Current limit | Ipk sense pin |+| Package | SOIC-8 |++## Ordering variants++- `MC34063AD (SOIC-8)`+- `MC34063AP (PDIP-8)`++## CAD (KiCad official)++- Symbol: `Regulator_Switching:MC34063AD`+- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`+- 3D model: SOIC-8 (KiCad packages3D)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/lit/ds/symlink/mc34063a.pdf) (32 pp, sha256 `bad86a3b68c35766`, retrieved 2026-08-17, tier: manufacturer)+- **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/mc34063-datasheet.pdf)

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