component
LM43603AQPWPTQ1
Public Made by Adomby adom
Texas Instruments DC-DC Converters, HTSSOP-16-EP. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdownLM43603AQPWPTQ1
Texas Instruments · DC-DC Converters · HTSSOP-16-EP
LM43603AQPWPTQ1 from Texas Instruments, in a HTSSOP-16-EP. 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 | SW | power_out | Switching output of the regulator, internally connected to both power MOSFETs; connect to the power inductor. |
| 2 | SW | power_out | Switching output of the regulator, internally connected to both power MOSFETs; connect to the power inductor. |
| 3 | CBOOT | passive | Bootstrap capacitor connection for the high-side driver; connect a high-quality 470-nF capacitor from CBOOT to SW. |
| 4 | VCC | power_out | Internal bias supply output for bypassing to AGND; do not connect external loading to this pin and never short it to ground during operation. |
| 5 | BIAS | power_in | Optional internal LDO supply input, recommended tied to VOUT for 3.3 V ≤ VOUT ≤ 28 V; BIAS pin voltage should never exceed VIN, and the pin must be tied to ground when unused and not left floating. |
| 6 | SYNC | input | Clock input to synchronize switching action to an external clock; use proper high-speed termination, connect to ground if not used, and do not float. |
| 7 | RT | passive | Resistor connection from this pin to AGND programs the switching frequency; leave floating for the 500 kHz default. |
| 8 | PGOOD | output | Open-drain power-good flag output; use a 10-kΩ to 100-kΩ pullup to a logic rail or DC voltage no higher than 12 V. |
| 9 | FB | input | Feedback sense input connected to the midpoint of the feedback divider to set VOUT; do not short this pin to ground during operation. |
| 10 | AGND | power_in | Analog ground pin serving as the ground reference for internal references and logic; connect to system ground. |
| 11 | SS/TRK | passive | Soft-start control pin: leave floating for internal soft-start slew rate, connect a capacitor to extend soft-start time, or connect an external voltage ramp for tracking. |
| 12 | EN | input | Enable input to the internal LDO and regulator, high = ON and low = OFF; connect to VIN, a resistor divider, or an external voltage or logic source and do not float. |
| 13 | VIN | power_in | Supply input to the internal LDO and high-side power FET; bypass with CIN and keep the path from VIN to CIN and PGND as short as possible. |
| 14 | VIN | power_in | Supply input to the internal LDO and high-side power FET; bypass with CIN and keep the path from VIN to CIN and PGND as short as possible. |
| 15 | PGND | power_in | Power ground pin connected internally to the low-side power FET; connect to system ground, PAD, AGND and the CIN and COUT grounds. |
| 16 | PGND | power_in | Power ground pin connected internally to the low-side power FET; connect to system ground, PAD, AGND and the CIN and COUT grounds. |
| 17 | EP | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | HTSSOP-16-EP |
| Category | Power Supply Chip |
| Pins | 17 |
CAD (KiCad official)
- Symbol:
LM43603AQPWPTQ1 - Footprint:
Package_SO:TSSOP-16-1EP_4.4x5mm_P0.65mm - 3D model: HTSSOP-16-EP (KiCad packages3D, STEP)
- 3D model files:
lm43603aqpwptq1-etched.step/lm43603aqpwptq1-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);lm43603aqpwptq1.step/lm43603aqpwptq1.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Texas Instruments datasheet (50 pp, sha256
a594b61b24d8e622, retrieved 2026-10-08, 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, primaryclaude-haiku-5-5(text), consensusclaude-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).