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BQ2057WTSTR
TSSOP-20 (6.5x4.4mm)
The BQ2057WTSTR from TI is a 2-cell Li-ion linear battery charger with 2A charge current, preconditioning, and charge status in TSSOP-20 for battery pack charging.
| Package | TSSOP-20 (6.5×4.4mm) |
The BQ2057WTSTR from TI is a 2-cell Li-ion linear battery charger with 2A charge current, preconditioning, and charge status in TSSOP-20 for battery pack charging.
The BQ2057WTSTR is a 2-cell Li-Ion/Li-Polymer linear battery charger from TI in TSSOP-20. It implements a CC-CV (Constant Current-Constant Voltage) charging algorithm: the CC phase delivers constant current (set by external sense resistor on SNS pin) until the battery reaches the regulation voltage (8.2V or 8.4V for 2-cell), then the CV phase holds this voltage while current tapers. The CC pin drives the base of an external PNP pass transistor; the BQ2057 modulates the PNP base current to regulate charge current. The SNS pin monitors voltage across an external sense resistor (typically 0.1-0.25 Ohm) to measure charge current: Ichg = 0.1V / Rsns. The TS pin interfaces with a 10k NTC thermistor on the battery pack for temperature qualification: charging is suspended if battery temperature is outside the 0-45C window. The STAT pin provides charge status indication: HIGH during charge, LOW when complete, and blinking during fault. Charge termination occurs when current drops below the programmable threshold (typically C/10).
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | VCC | Power | Supply input (4.5-18V) |
| 2 | TS | Input | Temperature sense (NTC thermistor input) |
| 3 | STAT | Output | Charge status output (LED driver) |
| 4 | VSS | Power | Ground |
| 5 | CC | Output | Charge control output (drives external PNP base) |
| 6 | COMP | I/O | Compensation capacitor for charge loop |
| 7 | SNS | Input | Current sense input (from sense resistor) |
| 8 | BAT | Input | Battery voltage sense input |
| Manufacturer | Part Number | Package | Notes |
|---|---|---|---|
| Texas Instruments | BQ2057WTSSTR | TSSOP-20 | Same device, different package code |
| Texas Instruments | BQ2057CSN | SOIC-8 | Single-cell version, 4.1V/4.2V |
| Microchip | MCP73871-2CCI/ML | QFN-20 | 2-cell Li-Ion charger, 1A |
| Maxim | MAX1737EEI+ | QSOP-28 | 2-cell Li+ charger, switch-mode |
| Analog Devices | LTC4006EUH#PBF | QFN-24 | 2-cell Li-Ion, switch-mode charger |
Brand:
Package:
Cargo cycle: 3~7 Days
The minimum order is 1
Brand:
Package:
Cargo cycle: 3~7 Days
The minimum order is 1
Brand:
Package:
Cargo cycle: 3~7 Days
The minimum order is 1
Brand:
Package:
Cargo cycle: 3~7 Days
The minimum order is 1
Brand:
Package:
Cargo cycle: 3~7 Days
The minimum order is 1
Brand:
Package:
Cargo cycle: 3~7 Days
The minimum order is 1
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