ZSPM4551
High-Efficiency Charger
for Li-Ion Batteries
Datasheet
Brief Description
Features
The ZSPM4551 is a DC/DC synchronous switching
lithium-ion (Li-Ion) battery charger with fully inte-
grated power switches, internal compensation, and
full fault protection.
•
VBAT reverse-current blocking
•
Programmable temperature-compensated
termination voltage: 3.94V to 4.18V ± 1%
•
User programmable maximum charge current:
50mA to 1500mA
Its switching frequency of 1MHz enables the use of
small filter components, resulting in smaller board
space and reduced BOM costs.
•
•
•
•
Current mode PWM control in constant voltage
Supervisor for VBAT reported at the NFLT pin
Input supply under-voltage lockout
In Full-Charge Constant-Current Mode, the regula-
tion is for constant current (CC). Once termination
voltage is reached, the regulator operates in voltage
mode. When the regulator is disabled (the EN pin is
low), the device draws 10µA (typical) quiescent
current.
Full protection for over-current, over-temperature,
VBAT over-voltage, and charging timeout
•
•
Charge status indication
I2C™ program interface with EEPROM registers
The ZSPM4551 includes supervisory reporting
through the NFLT (inverted fault) open-drain output
to interface other components in the system. Device
programming is achieved by an I²C™* interface
through the SCL and SDA pins.
Related IDT Smart Power Products
•
ZSPM4121 Ultra-low Power Under-Voltage
Switch
•
ZSPM4141 Ultra-Low-Power Linear Regulator
Benefits
Physical Characteristics
•
Up to 1.5A of continuous output current in Full-
Charge Constant-Current (CC) Mode
•
Wide input voltage range: VBAT + 0.3V (3.5V min.)
to 7.2V
•
High efficiency – up to 92% with typical loads
•
•
Junction operating temperature: -40°C to 125°C
Package: 16-pin PQFN (4mm x 4mm)
Available Support
•
Evaluation Kit
ZSPM4551 Application Circuit
•
Support Documentation
ZSPM4551
VIN
VTH_REF
CIN
RREF
GND
VTHERM
CVDD
RSENSE
LOUT
Battery
VDD
SCL
SW
COUT
RTHM
VSENSE
VDD
RPULLUP
(optional)
SDA
EN
VBAT
NFLT
VDD
RPULLUP
(optional)
PGND
* I2C™ is a trademark of NXP.
© 2016 Integrated Device Technology, Inc.
1
January 29, 2016