Features

ZSPM4521
High-Efficiency Charger for Li-Ion Batteries with Photovoltaic Sources
Features
Brief Description

The ZSPM4521 is a DC/DC synchronous switching
lithium-ion (Li-Ion) battery charger with fully integrated power switches, internal compensation, and
full fault protection. It uses a temperature-independent 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.
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During Full-Charge Constant-Current Mode, the duty
cycle is controlled by the MPPT regulator. Once the
battery’s termination voltage is reached, the regulator 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).
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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 VBAT reported at the NFLT pin
Input supply under-voltage lockout
Full protection for VBAT over-current, overtemperature, VBAT over-voltage, and charging
timeout
Charge status indication
2
I C™ program interface with EEPROM registers
Related ZMDI Smart Power Products

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.



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
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Up to 1.5A of continuous output current in FullCharge Constant Current (CC) Mode
High efficiency – up to 92% with typical loads
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Available Support
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Wide input voltage range: 4.0V to 7.2V
Junction operating temperature: -40°C to 125°C
Package: 16-pin PQFN (4mm x 4mm)
ZSPM4521 Application Circuit
Evaluation Kit
Documentation
ZSPM4521
Photovoltaic Cells
VIN
VTH_REF
RREF
CIN
VTHERM
GND
CVDD
RSENSE
LOUT
VDD
Battery
SW
COUT
VDD
RPULLUP
(optional)
SCL
VSENSE
SDA
VBAT
RTHM
VDD
EN
NFLT
RPULLUP
(optional)
PGND
* I2C™ is a trademark of NXP.
For more information, contact ZMDI via [email protected]
© 2014 Zentrum Mikroelektronik Dresden AG — Rev. 1.01— October 3, 2014. 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
EN
NFLT
Photovoltaic
Cells
VIN
VIN
CIN
VIN
ZSPM4521
SCL
I²C™*
Interface
MONITOR
&
CONTROL
OverVoltage
Protection
Oscillator
SDA
~5V @ 450mA
VBAT
VTH_REF
BATT Thermal
Control
Ramp
Generator
BATT Current
Control
RREF
VTHERM
VBAT
VIN

Vref
Gate
Drive
Typical Applications
Backgate
Blocking
Gate Drive
Control

Portable solar chargers

Off-grid systems
Comparator
Wireless sensor
networks
 HVAC controls
LOUT
RSENSE
BATTERY
COUT
Compensation
Network
RTHM
Gate
Drive
Error Amp

SW
PGND
VIN
VDD Regulator
MPP & Current
Control
VSENSE
VBAT
VDD
GND
CVDD
*I2C™ is a trademark of NXP.
Ordering Information
Ordering Code
Description
Package
ZSPM4521AA1W
ZSPM4521 High Efficiency Li-Ion Battery Charger for
Photovoltaic Sources
16-pin PQFN / 7” Reel (1000 parts)
ZSPM4521AA1R
ZSPM4521 High Efficiency Li-Ion Battery Charger for
Photovoltaic Sources
16-pin PQFN / 13” Reel (3300 parts)
ZSPM4521KIT
ZSPM4521 Evaluation Kit
Kit
Sales and Further Information
www.zmdi.com
[email protected]
Zentrum Mikroelektronik
Dresden AG
Global Headquarters
Grenzstrasse 28
01109 Dresden, Germany
ZMD America, Inc.
1525 McCarthy Blvd., #212
Milpitas, CA 95035-7453
USA
Central Office:
Phone +49.351.8822.306
Fax
+49.351.8822.337
USA Phone 1.855.275.9634
Phone +1.408.883.6310
Fax
+1.408.883.6358
European Technical Support
Phone +49.351.8822.7.772
Fax
+49.351.8822.87.772
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.
European Sales (Stuttgart)
Phone +49.711.674517.55
Fax
+49.711.674517.87955
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
Phone +81.3.6895.7410
Fax
+81.3.6895.7301
Phone +886.2.2377.8189
Fax
+886.2.2377.8199
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
© 2014 Zentrum Mikroelektronik Dresden AG — Rev. 1.01— October 3, 2014
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.