ZSPM4551 Datasheet, PDF (1/29 Pages) List of Unclassifed Manufacturers – High-Efficiency Charger for Li-Ion Batteries

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