1 Features
• Input voltage up to 30 V tolerant
• Input Voltage Based Dynamic Power Management
(VINDPM) tracking battery voltage
• Automatic Sleep Mode for low power consumption
– 350-nA battery leakage current
– 80-μA input leakage current when charge
disabled
• Supports 1-cell Li-Ion, Li-Poly, and LiFePO4
• External resistor programmable operation
– VSET to set battery regulation voltage:
• Li-Ion: 4.05 V, 4.15 V, 4.2 V, 4.35 V, 4.4 V
• LiFePO4: 3.5 V, 3.6 V, 3.7 V
– ISET to set charge current from 10 mA to 800
mA
• High accuracy
– ±0.5% charge voltage accuracy
– ±10% charge current accuracy
• Charging features
– Precharge current 20% of ISET
– Termination current 10% of ISET
– Battery tracking input voltage dynamic power
management (VINDPM) for solar charging
– BIAS pin for charging function control
– Open-drain output for status and fault indication
– Open-drain output for power good indication
• Integrated fault protection
– 18.1-V IN overvoltage protection
– VSET based OUT overvoltage protection
– 1000-mA overcurrent protection
– 125°C thermal regulation; 150°C thermal
shutdown protection
– OUT short-circuit protection
– VSET, ISET pins short/open protection

2 Applications
• Smart trackers
• Low-power handheld devices
• Auxilliary solar chargers

3 Description
The BQ25176M is an integrated 800-mA linear solar
charger for 1-cell Li-Ion, Li-Polymer, and LiFePO4
batteries with continual charge mode and battery
tracking VINDPM. The device has a single power
output that charges the battery. When the system
load is placed in parallel with the battery, the charge
current is shared between the system and the battery.
The device has four phases for charging a Li-Ion/
Li-Poly battery: trickle charge to bring the battery
voltage up to VBAT_SHORT, precharge to recover a fully
discharged battery, fast-charge constant current to
supply the bulk of the charge, and voltage regulation
to reach full capacity.
In all charge phases, an internal control loop monitors
the IC junction temperature and reduces the charge
current if an internal temperature threshold, TREG, is
exceeded.
The charger power stage and charge current sense
functions are fully integrated. The charger function
has high accuracy current and voltage regulation
loops, charge status display, and automatic charge
termination. The charge voltage and fast charge
current are programmable through external resistors.
The precharge and termination current threshold track
the fast charge current setting.