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
2
I C™ program interface with EEPROM registers
Related IDT Smart Power Products
•
•
ZSPM4121 Ultra-low Power Under-Voltage
Switch
ZSPM4141 Ultra-Low-Power Linear Regulator
Benefits
•
•
Physical Characteristics
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•
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Up to 1.5A of continuous output current in Full-
Charge Constant-Current (CC) Mode
High efficiency – up to 92% with typical loads
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)
Available Support
•
•
Evaluation Kit
Support Documentation
ZSPM4551 Application Circuit
ZSPM4551
VIN
C
IN
VTH_REF
R
REF
GND
C
VDD
VTHERM
L
OUT
R
SENSE
C
OUT
Battery
VDD
SCL
SDA
SW
VSENSE
VBAT
VDD
R
PULLUP
(optional)
R
THM
VDD
R
PULLUP
(optional)
EN
PGND
NFLT
* I
2
C™ is a trademark of NXP.
© 2016 Integrated Device Technology, Inc.
1
January 29, 2016
High-Efficiency Charger
for Li-Ion Batteries
ZSPM4551
Datasheet
ZSPM4551 Block Diagram
NFLT
EN
VIN
VIN
VIN
ZSPM4551
MONITOR
&
CONTROL
I²C™*
Interface
SCL
SDA
VTH_REF
R
REF
Over-Voltage
Protection
BATT Thermal
Control
BATT Current
Control
VBAT
Oscillator
Ramp
Generator
VBAT
VIN
VTHERM
S
Vref
Gate
Drive
Gate Drive
Control
Backgate
Blocking
SW
L
OUT
R
SENSE
C
OUT
Typical Applications
•
•
•
•
BATTERY
Portable battery chargers
Smart phones
Laptops
Tablets / e-readers
Comparator
Error Amp
Compensation
Network
Gate
Drive
VIN
R
THM
PGND
VDD Regulator
Current
Control
VSENSE
VBAT
VDD
C
VDD
GND
I²C™*is a trademark of NXP.
Ordering Information
Ordering Code
ZSPM4551AA1W
ZSPM4551AA1R
ZSPM4551KIT
Description
ZSPM4551 High-Efficiency Li-Ion Battery Charger
ZSPM4551 High-Efficiency Li-Ion Battery Charger
ZSPM4551 Evaluation Kit
Package
16-pin PQFN / 7” Reel (1000 parts)
16-pin PQFN / 13” Reel (3300 parts)
Corporate Headquarters
6024 Silver Creek Valley Road
San Jose, CA 95138
www.IDT.com
Sales
1-800-345-7015 or 408-284-8200
Fax: 408-284-2775
www.IDT.com/go/sales
Tech Support
www.IDT.com/go/support
DISCLAIMER Integrated Device Technology, Inc. (IDT) reserves the right to modify the products and/or specifications described herein at any time, without notice, at IDT's sole discretion. Performance
specifications and operating parameters of the described products are determined in an independent state and are not guaranteed to perform the same way when installed in customer products. The
information contained herein is provided without representation or warranty of any kind, whether express or implied, including, but not limited to, the suitability of IDT's products for any particular purpose, an
implied warranty of merchantability, or non-infringement of the intellectual property rights of others. This document is presented only as a guide and does not convey any license under intellectual property
rights of IDT or any third parties.
IDT's products are not intended for use in applications involving extreme environmental conditions or in life support systems or similar devices where the failure or malfunction of an IDT product can be
reasonably expected to significantly affect the health or safety of users. Anyone using an IDT product in such a manner does so at their own risk, absent an express, written agreement by IDT.
Integrated Device Technology, IDT and the IDT logo are trademarks or registered trademarks of IDT and its subsidiaries in the United States and other countries. Other trademarks used herein are the
property of IDT or their respective third party owners. For datasheet type definitions and a glossary of common terms, visit
www.idt.com/go/glossary.
All contents of this document are copyright of Integrated
Device Technology, Inc. All rights reserved.
© 2016 Integrated Device Technology, Inc.
2
January 29, 2016
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