ZSPM4521
High-Efficiency Charger for Li-Ion Batteries with Photovoltaic Sources
Brief Description
The ZSPM4521 is a DC/DC synchronous switching
lithium-ion (Li-Ion) battery charger with fully inte-
grated power switches, internal compensation, and
full fault protection. It uses a temperature-indepen-
dent photovoltaic maximum power point tracking
(MPPT) function to optimize power output from the
source during Full-Charge Constant-Current (CC)
Mode. Its switching frequency of 1MHz enables the
use of small filter components, resulting in smaller
board space and reduced bill-of material costs.
During Full-Charge Constant-Current Mode, the duty
cycle is controlled by the MPPT regulator. Once the
battery’s termination voltage is reached, the regula-
tor operates in Constant Voltage Mode. In this mode,
the ZSPM4521 modulates the charging current until
the battery reaches full charge. When the regulator
is disabled (the EN pin is low), the device draws
10µA (typical) quiescent current (Disabled Mode).
The ZSPM4521 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
Temperature-independent photovoltaic maximum
power tracking (MPPT) regulator
VBAT reverse-current blocking
Programmable temperature-compensated
termination voltage: 3.94V to 4.18V ± 1%
User programmable maximum charge current:
50mA to 1500mA
Supervisor for V
BAT
reported at the NFLT pin
Input supply under-voltage lockout
Full protection for VBAT over-current, over-
temperature, VBAT over-voltage, and charging
timeout
Charge status indication
2
I C™ program interface with EEPROM registers
Related ZMDI Smart Power Products
ZSPM4523 DC/DC Synchronous Switching
Super Capacitor Charger With MPPT Regulator
ZSPM4551 High-Efficiency Li-Ion Battery Charger
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
High efficiency – up to 92% with typical loads
Wide input voltage range: 4.0V to 7.2V
Junction operating temperature: -40°C to 125°C
Package: 16-pin PQFN (4mm x 4mm)
Available Support
ZSPM4521 Application Circuit
ZSPM4521
Photovoltaic Cells
Evaluation Kit
Documentation
VIN
C
IN
VTH_REF
R
REF
VTHERM
GND
C
VDD
L
OUT
R
SENSE
C
OUT
VDD
R
PULLUP
(optional)
VDD
SCL
SDA
Battery
SW
VSENSE
VBAT
VDD
R
PULLUP
(optional)
R
THM
EN
PGND
NFLT
* I
2
C™ is a trademark of NXP.
For more information, contact ZMDI via
analog@zmdi.com.
© 2013 Zentrum Mikroelektronik Dresden AG — Rev.1.00 — February 14, 2013.
All rights reserved. The material contained herein may not be reproduced, adapted, merged,
translated, stored, or used without the prior written consent of the copyright owner. The information furnished in this publication is subject to changes without notice.
ZSPM4521
High-Efficiency Charger for Li-Ion Batteries with Photovoltaic Sources
ZSPM4521 Block Diagram
NFLT
EN
VIN
VIN
VIN
Photovoltaic
Cells
C
IN
ZSPM4521
MONITOR
&
CONTROL
Over-
Voltage
Protection
BATT Thermal
Control
BATT Current
Control
VBAT
I²C™*
Interface
SCL
SDA
~5V @ 450mA
VBAT
VTH_REF
R
REF
Oscillator
Ramp
Generator
VTHERM
VIN
Vref
Gate
Drive
Gate Drive
Control
Backgate
Blocking
Typical Applications
SW
L
OUT
R
SENSE
C
OUT
BATTERY
Portable solar chargers
Off-grid systems
Wireless sensor
networks
HVAC controls
VDD
C
VDD
Comparator
Error Amp
Compensation
Network
Gate
Drive
VIN
R
THM
PGND
VDD Regulator
MPP & Current
Control
VSENSE
VBAT
GND
*I
2
C™ is a trademark of NXP.
Ordering Information
Ordering Code
ZSPM4521AA1W
ZSPM4521AA1R
ZSPM4521KIT
Description
ZSPM4521 High Efficiency Li-Ion Battery Charger for
Photovoltaic Sources
ZSPM4521 High Efficiency Li-Ion Battery Charger for
Photovoltaic Sources
ZSPM4521 Evaluation Kit
Package
16-pin PQFN / 7” Reel (1000 parts)
16-pin PQFN / 13” Reel (3300 parts)
Sales and Further Information
Zentrum Mikroelektronik
Dresden AG
Grenzstrasse 28
01109 Dresden
Germany
ZMD America, Inc.
1525 McCarthy Blvd., #212
Milpitas, CA 95035-7453
USA
www.zmdi.com
Zentrum Mikroelektronik
Dresden AG, Japan Office
2nd Floor, Shinbashi Tokyu Bldg.
4-21-3, Shinbashi, Minato-ku
Tokyo, 105-0004
Japan
ZMD Far East, Ltd.
3F, No. 51, Sec. 2,
Keelung Road
11052 Taipei
Taiwan
Analog@zmdi.com
Zentrum Mikroelektronik
Dresden AG, Korea Office
U-space 1 Building
11th Floor, Unit JA-1102
670 Sampyeong-dong
Bundang-gu, Seongnam-si
Gyeonggi-do, 463-400
Korea
Phone +82.31.950.7679
Fax
+82.504.841.3026
Phone +49.351.8822.7.776
Fax +49.351.8822.8.7776
Phone +855.275.9634 (USA) Phone +81.3.6895.7410
Fax
+81.3.6895.7301
Phone +408.883.6310
Fax
+408.883.6358
Phone +886.2.2377.8189
Fax
+886.2.2377.8199
DISCLAIMER: This information applies to a product under development. Its characteristics and specifications are subject to change without notice. Zentrum Mikroelektronik Dresden AG
(ZMD AG) assumes no obligation regarding future manufacture unless otherwise agreed to in writing. The information furnished hereby is believed to be true and accurate. However, under
no circumstances shall ZMD AG be liable to any customer, licensee, or any other third party for any special, indirect, incidental, or consequential damages of any kind or nature whatsoever
arising out of or in any way related to the furnishing, performance, or use of this technical data. ZMD AG hereby expressly disclaims any liability of ZMD AG to any customer, licensee or
any other third party, and any such customer, licensee and any other third party hereby waives any liability of ZMD AG for any damages in connection with or arising out of the furnishing,
performance or use of this technical data, whether based on contract, warranty, tort (including negligence), strict liability, or otherwise.
© 2013 Zentrum Mikroelektronik Dresden AG — Rev. 1.00— February 14, 2013
All rights reserved. The material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner.
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