AP62300TWU-7 — 3 A Synchronous Buck Converter, 4.2 to 18 V (Diodes)
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Diodes Incorporated AP62300T — 3 A synchronous buck converter with a 4.2 to 18 V input and 0.8 to 7 V adjustable output. Constant on-time control, 0.763 V feedback reference, integrated 75 mΩ high-side and 45 mΩ low-side MOSFETs, 750 kHz typical switching, PFM at light load for 155 µA quiescent current, EMI-shaped gate driver, UVLO, valley current limit, output UVP and thermal shutdown, 6-pin TSOT-26.
3D Model
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README
markdownAP62300TWU-7: 3 A Synchronous Buck Converter, 4.2 to 18 V (Diodes Inc)
Diodes Incorporated AP62300T is a 3 A synchronous step-down converter with integrated 75 mΩ high-side and 45 mΩ low-side MOSFETs. Constant on-time (COT) control means fast transient response and almost no loop compensation work: an inductor, three capacitors and a feedback divider make a supply. It drops to PFM at light load for 155 µA quiescent current, and the gate driver is shaped for low radiated EMI.
| MPN | AP62300TWU-7 (tape and reel, 3000 pcs) |
| Manufacturer | Diodes Incorporated |
| Package | TSOT26 (Standard) = TSOT-23-6, body 2.90 × 1.60 mm, 2.80 mm lead span, 0.95 mm pitch, 1.00 mm max height |
| Part marking | TP |
| KiCad symbol | AP62300TWU-7:AP62300TWU-7 |
| KiCad footprint | AP62300TWU-7:SOT95P280X100-6N (SamacSys) |
| 3D | ap62300twu-7.glb (page viewer) + ap62300twu-7.step (manufacturer model) |
| Fusion / EAGLE | AP62300TWU-7.lbr, canonical hub ap62300twu-7.adom-lbr.json |
| Datasheet | DS41958 Rev 4-2, diodes.com |
| Order | DigiKey 31-AP62300TWU-7TR-ND, Mouser 621-AP62300TWU-7, LCSC C1883519 |
This is the
Tvariant.AP62300TWU-7is the AP62300T: feedback reference 0.763 V, not the 0.800 V ofAP62300WU-7. Same pinout, same footprint, same package, but the divider math differs and the two are not drop-in equivalent at a fixed output.AP62301is the third sibling: 0.800 V reference, PWM only (no PFM), 275 µA IQ.
Electrical (AP62300T, from DS41958)
| Parameter | Value |
|---|---|
| Input voltage | 4.2 … 18 V (abs max 20 V DC, 22 V for 400 ms) |
| Output voltage | 0.8 … 7 V, set by an external divider |
| Feedback reference VFB | 0.763 V ±1% at 25 °C (0.747 … 0.778 V over temperature) |
| Continuous output current | 3 A |
| Low-side valley current limit | 3.2 / 3.7 / 4.2 A (min / typ / max) |
| Switching frequency | 750 kHz typ (VIN 12 V, VOUT 5 V, CCM) |
| Minimum on-time / off-time | 90 ns / 220 ns |
| RDS(ON) | 75 mΩ high-side, 45 mΩ low-side |
| Quiescent current | 155 µA (PFM, not switching), 1.5 µA in shutdown |
| POR rising / UVLO falling | 3.90 … 4.15 V / 3.6 V typ |
| EN thresholds | 1.20 … 1.25 V high, 1.04 … 1.10 V low; 7 µA typ at VEN = 1.5 V |
| Soft-start | 2.5 ms internal |
| Control | Constant on-time (COT), PFM at light load / PWM at load |
| Protection | UVLO, cycle-by-cycle valley current limit, output UVP, thermal shutdown 160 °C (20 °C hysteresis) |
| Thermal resistance | θJA 70 °C/W, θJC 12 °C/W (TSOT26, 2-layer 2 oz board) |
| ESD | ±2 kV HBM, ±500 V CDM |
| Temperature | TA –40 … +85 °C, TJ –40 … +125 °C |
Pinout
| Pin | Name | Type | Notes |
|---|---|---|---|
| 1 | GND | power in | power ground, and the thermal path for this package |
| 2 | SW | power out | switch node, to the inductor and the BST capacitor |
| 3 | VIN | power in | 4.2 … 18 V, 10 µF ceramic to GND right at the pin |
| 4 | FB | input | divider tap, regulates to 0.763 V |
| 5 | EN | input | high = on, low = off, float = automatic start; 1.2 V precision threshold for programming UVLO |
| 6 | BST | passive | high-side gate drive bootstrap, 100 nF from BST to SW |
Setting the output voltage
R1 sits between VOUT and FB, R2 from FB to GND:
R1 = R2 × (VOUT / 0.763 − 1)
Diodes' recommended values for this variant, all with R2 = 10 kΩ:
| VOUT | R1 (AP62300T) | L | CIN | COUT | CFF (optional) |
|---|---|---|---|---|---|
| 1.2 V | 5.76 kΩ | 1.5 µH | 10 µF | 2 × 22 µF | open |
| 1.5 V | 9.76 kΩ | 1.5 µH | 10 µF | 2 × 22 µF | open |
| 1.8 V | 13.7 kΩ | 2.2 µH | 10 µF | 2 × 22 µF | 10 … 100 pF |
| 2.5 V | 22.6 kΩ | 2.2 µH | 10 µF | 2 × 22 µF | 10 … 100 pF |
| 3.3 V | 33.2 kΩ | 3.3 µH | 10 µF | 2 × 22 µF | 10 … 100 pF |
| 5.0 V | 56.2 kΩ | 3.3 µH | 10 µF | 2 × 22 µF | 10 … 100 pF |
The R1 column is different for the 0.800 V parts (AP62300/AP62301), so do not copy a
divider from an AP62300WU-7 design onto this part.
Files
AP62300TWU-7.kicad_sym: KiCad 9/10 symbol, 5 standard fields, 6 pinsSOT95P280X100-6N.kicad_mod: KiCad 9 footprint, modern(footprint …)syntaxap62300twu-7.step: manufacturer STEP.ap62300twu-7.glb: color-preserving GLBAP62300TWU-7.lbr: EAGLE / Fusion 360 Electronics library (symbol + package + deviceset)ap62300twu-7.adom-lbr.json: canonical adom-lbr hub (exports to Altium, KiCad, IntLib)docs/AP62300-datasheet.pdf: Diodes DS41958 Rev 4-2, July 2023docs/symbol.svg,docs/footprint.svg: rendered symbol and footprint previewsskills/ap62300twu-7-usage/SKILL.md: how to design in, lay out and order the part
CAD came from the SamacSys bundle. The symbol was rebuilt in the Adom house style and the footprint converted to modern KiCad syntax; pad geometry is unchanged from the vendor model (0.60 × 1.15 mm pads on a 0.95 mm pitch, 2.60 mm span between pad centres), which is IPC-7351 nominal and runs a longer toe than the 0.70 × 1.00 mm pads in Diodes' own suggested land pattern.