TP5400

@@ -0,0 +1,47 @@+# TP5400++**TOPPOWER Nanjing Extension Microelectronics** · Battery Management · ESOP-8++TP5400 from TOPPOWER Nanjing Extension Microelectronics, in a ESOP-8. 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 | VOUT | power_out | 5V boost output voltage sense/output pin. Requires at least 47uF (tantalum/electrolytic) plus a 0.1uF ceramic and a 5.5V-6.8V TVS clamp for stable operation. Delivers up to 1A typical (1.5A peak, Vbat=3.8V). |+| 2 | CHRG | output | Open-drain charge status indicator. Pulls low (VOL <= 0.6V at 5mA) while charging is in progress; high-Z when charge is complete or the chip is in standby/shutdown. Typically drives an LED to VCC through a series resistor. |+| 3 | PROG | bidirectional | Charge current program pin. Connect a resistor RPROG from PROG to GND to set IBAT = 1100 / RPROG (e.g. 1.1k -> 1000mA, 1.5k -> 740mA). Regulated to ~1V in constant-current mode; also monitors PROG voltage (<200mV for tTERM ~1.8ms) for C/5 termination. Leaving PROG floating shuts down the charger. |+| 4 | STDBY | output | Open-drain standby (charge-complete) indicator. Pulls low (VOL <= 0.6V at 5mA) when the charge cycle has terminated and the chip is in standby; high-Z while charging. Typically drives an indicator LED. |+| 5 | VCC | power_in | Charger input supply, 4.0V to 9.0V (typ 5V). Powers the linear charger to BAT. UVLO threshold ~3.6V with 200mV hysteresis; charger inhibited when VCC is within 30mV of VBAT to prevent reverse current. Bypass with 10uF plus a 0.1uF ceramic close to the pin. |+| 6 | BAT | bidirectional | Single-cell Li-Ion battery connection. Acts as the charger's regulated output (4.2V ±1% float, up to ~1.2A programmable) and as the boost converter's input (operates for VBAT 3V-4.2V). Recommended bypass 2x22uF. Undervoltage lockout: boost shuts down when VBAT drops below ~3V and re-enables above ~3.3V. |+| 7 | GND | power_in | Power / signal ground. Must be well-connected to system ground for stable operation. Exposed die-pad (radiator) on the ESOP-8 package should also be tied to GND (or left floating) for thermal dissipation. |+| 8 | LX | power_out | Switching node of the internal boost NMOS power stage. Connect an external inductor (3.3-22uH, typ 10uH) from BAT to LX and a Schottky diode (e.g. SS32) from LX to VOUT. Absolute range -2V to +10V; internal switch RDS(on) ~120mOhm, current limit ~4.5A. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | TOPPOWER Nanjing Extension Microelectronics |+| Package | ESOP-8 |+| Category | PMIC |+| Pins | 8 |++## Ordering variants++- `TP5400ESOP8`++## CAD (KiCad official)++- Symbol: `TP5400`+- Footprint: `Package_SO:SOIC-8-1EP_3.9x4.9mm_P1.27mm_EP2.41x3.3mm`+- 3D model: ESOP-8 (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [TOPPOWER Nanjing Extension Microelectronics datasheet](docs/tp5400-datasheet.pdf) (8 pp, sha256 `f93dcae2a90a5c70`, 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/tp5400-datasheet.pdf)

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