ZSPM4521 Datasheet, PDF (1/3 Pages) List of Unclassifed Manufacturers – High-Efficiency Charger for Li-Ion Batteries with Photovoltaic Sources

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.
Benefits
 Up to 1.5A of continuous output current in Full-
Charge Constant Current (CC) Mode
 High efficiency – up to 92% with typical loads
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
 I²C™ 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
Physical Characteristics
 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
 Evaluation Kit
 Documentation
ZSPM4521 Application Circuit
Photovoltaic Cells
ZSPM4521
CIN
CVDD
VIN
GND
VDD
VTH_REF
VTHERM
SW
VDD
RPULLUP
(optional)
SCL
SDA
VSENSE
VBAT
EN
NFLT
PGND
LOUT
RSENSE
VDD
RPULLUP
(optional)
RREF
COUT
Battery
RTHM
* I²C™ is a trademark of NXP.
For more information, contact ZMDI via [e-mail].
© 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.