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LP3921SQE

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by adom

Texas Instruments Battery Management, WQFN-32-EP(5x5). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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Contents

README

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LP3921SQE

Texas Instruments · Battery Management · WQFN-32-EP(5x5)

LP3921SQE from Texas Instruments, in a WQFN-32-EP(5x5). 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 LDO6 power_out LDO6 Output for TX with 150 mA capability and programmable voltage.
2 TX_EN input Enable control for LDO6 (TX), HIGH to enable or LOW to disable.
3 LDO5 power_out LDO5 Output for RX with 150 mA capability and programmable voltage.
4 VIN2 power_in Battery input for LDO3 through LDO7 with operating range 3.0V to 5.5V.
5 LDO7 power_out LDO7 Output for GP with 150 mA capability and programmable voltage.
6 OUT+ output Differential amplifier positive output capable of driving capacitive loads up to 100 pF.
7 VDD power_in DC power input for audio amplifier with operating range 3.0V to 5.5V.
8 OUT- output Differential amplifier negative output capable of driving capacitive loads up to 100 pF.
9 IN+ input Differential amplifier positive input.
10 IN- input Differential amplifier negative input.
11 GND power_in Analog ground connection.
12 BYPASS passive External bypass capacitor connection for amplifier stabilization.
13 LDO4 power_out LDO4 Output for TCXO with 80 mA capability and programmable voltage.
14 LDO3 power_out LDO3 Output for ANA with 80 mA capability and programmable voltage.
15 LDO2 power_out LDO2 Output for DIGI with 300 mA capability, default 3.0V, and programmable voltage.
16 LDO1 power_out LDO1 Output for CORE with 300 mA capability, default 1.8V, and programmable voltage.
17 VIN1 power_in Battery input for LDO1 and LDO2 with operating range 3.0V to 5.5V.
18 GNDA power_in Analog ground connection.
19 SDA bidirectional I2C serial interface data line with open-drain output requiring 1.5 kΩ external pull-up resistor.
20 SCL input I2C serial interface clock input requiring 1.5 kΩ external pull-up resistor.
21 BATT power_in Main battery connection for current delivery with operating range 3.0V to 5.5V.
22 CHG_IN power_in DC power input for charger from wall or car adapter with operating range 4.5V to 6.0V.
23 PWR_ON input Power-up sequence trigger input, active HIGH with internal 500 kΩ pull-down resistor.
24 IMON output Charge current monitor analog output with voltage relationship VIMON (mV) = 2.47 × ICHG (mA).
25 PS_HOLD input Power control input for external processor or controller.
26 TCXO_EN input Enable control for LDO4 (TCXO), HIGH to enable or LOW to disable.
27 HF_PWR input Power-up sequence trigger input, active HIGH with internal 500 kΩ pull-down resistor.
28 VSS power_in Digital ground connection.
29 PON_N output Active-low power-on signal, inverted version of PWR_ON input.
30 RESET_N output Reset output stays LOW during power-up sequence, asserted HIGH 60 ms after LDO1 reaches stable regulation.
31 ACOK_N output AC adapter presence indicator, active LOW when 4.5V to 6.0V detected at CHG_IN.
32 RX_EN input Enable control for LDO5 (RX), HIGH to enable or LOW to disable.
33 EP passive Exposed pad (from the footprint; not named in the datasheet pin table).

Key specifications

Parameter Value
Manufacturer Texas Instruments
Package WQFN-32-EP(5x5)
Category Power Management (PMIC)
Pins 33

CAD (KiCad official)

  • Symbol: LP3921SQE
  • Footprint: Package_DFN_QFN:QFN-32-1EP_5x5mm_P0.5mm_EP3.3x3.3mm
  • 3D model: WQFN-32-EP(5x5) (KiCad packages3D, STEP)
  • 3D model files: lp3921sqe-etched.step / lp3921sqe-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); lp3921sqe.step / lp3921sqe.glb are the bare package body.

Provenance

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

  • Datasheet: Texas Instruments datasheet (44 pp, sha256 c080356012c2b08f, retrieved 2026-10-01, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-haiku-4-5-20251001 (text), consensus claude-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).

Datasheet PDF