BQ24170 VQFN-24 Battery Management IC Integrated Circuits BQ24170RGYR BQ24170RGYT

BQ24170RGYR BQ24170 VQFN-24 Integrated Circuits (ICs) Battery Management ic

bq2417x 1.6-MHz Synchronous Switched-Mode Li-Ion and Li-Polymer Stand-Alone Battery
Charger With Integrated MOSFETs and Power Path Selector

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1 Features

1.6-MHz Synchronous Switched-Mode Charger
with 4-A Integrated N-MOSFETs
Up to 94% Efficiency
·30-V Input Rating with Adjustable Overvoltage
Protection
- 4.5-Vto 17-VInput Operating Voltage Range
Battery Charge Voltage
- bq24170:1-2-or 3-Cell with 4.2 V/Cell
- bq24172:Adjustable Charge Voltage
High Integration
- Automatic Power Path Selector Between
Adapter and Battery
- Dynamic Power Management
- Integrated 20-V Switching MOSFETs
Integrated Bootstrap Diode
- Internal Digital Soft Start
·Safety
- Thermal Regulation Loop Throttles Back
Current to LimitT=120°C
- Thermal Shutdown
- Battery Thermistor Sense Hot/Cold Charge
Suspend and Battery Detect
- Adjustable Input Overvoltage Protection
- Cycle-by-Cycle Current Limit
Accuracy
- +0.5% Charge Voltage Regulation
+4% Charge Current Regulation

2 Applications

Tablet PCs
Portable Data Capture Terminals
Portable Printers
Medical Diagnostics Equipment
Battery Bay Chargers
Battery Backup Systems

3 Description (continued)

The device charges the battery in three phases: precondictioning, constant current, and constant voltage. Charge is terminated when the current reaches 10% of the fast charge rate. A programmable charge timer offers a safety backup. The bq2417x automatically restarts the charge cycle if the battery voltage falls below an internal threshold, and enters a low-quiescent current sleep mode when the input voltage falls below the battery voltage.

The bq2417x features Dynamic Power Management (DPM) to reduce the charge current when the input power limit is reached to avoid overloading the adapter. A highly accurate current-sense amplifier enables precise measurement of input current from adapter to monitor overall system power. The bq2417x provides power path selector gate driver ACDRV/CMSRC on input NMOS pair ACFET (Q1) and RBFET (Q2), and BATDRV on a battery PMOS device (Q3). When the qualified adapter is present, the system is directly connected to the adapter. Otherwise, the system is connected to the battery. In addition, the power path prevents battery from boosting back to the input.

The bq2417x charges a battery from a DC source as high as 17 V, including a car battery. The input overvoltage limit is adjustable through the OVPSET pin. The AVCC, ACP, and ACN pins have a 30-V rating. When a highvoltage DC source is inserted, Q1 and Q2 remain off to avoid high voltage damage to the system. For 1-cell applications, if the battery is not removable, the system can be directly connected to the battery to simplify the power path design and reduce the cost. With this configuration, the battery can automatically supplement the system load if the adapter is overloaded.

The bq2417x is available in a 24-pin, 5.5-mm × 3.5-mm thin VQFN package.

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