MAX745 Maxim, MAX745 Datasheet
MAX745
Manufacturer Part Number
MAX745
Description
Switch-Mode Lithium-Ion Battery-Charger
Manufacturer
Maxim
Datasheet
1.MAX745.pdf
(8 pages)
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The MAX745 provides all functions necessary for
charging lithium-ion battery packs. It provides a regu-
lated charging current of up to 4A without getting hot,
and a regulated voltage with only ±0.75% total error at
the battery terminals. It uses low-cost, 1% resistors to
set the output voltage, and a low-cost N-channel MOS-
FET as the power switch.
The MAX745 regulates the voltage set point and charg-
ing current using two loops that work together to transi-
tion smoothly between voltage and current regulation.
The per-cell battery voltage regulation limit is set
between 4.0V and 4.4V using standard 1% resistors,
and then the number of cells is set from 1 to 4 by pin-
strapping. Total output voltage error is less than ±0.75%.
For a similar device with an SMBus™ microcontroller
interface and the ability to charge NiCd and NiMH cells,
refer to the MAX1647 and MAX1648. For a low-cost
lithium-ion charger using a linear-regulator control
scheme, refer to the MAX846A.
SMBus is a trademark of Intel Corp.
19-1182; Rev 2; 12/98
*
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
Dice are tested at T
___________________________________________________Typical Operating Circuit
MAX745C/D
MAX745EAP
PART
WITH 1% RESISTORS
CELL VOLTAGE
ON
A
________________________________________________________________ Maxim Integrated Products
SET PER
(UP TO 24V)
= +25°C.
TEMP. RANGE
-40°C to +85°C
SELECT
COUNT
0°C to +70°C
Ordering Information
CELL
OFF
General Description
V
IN
Dice*
20 SSOP
PIN-PACKAGE
CELL0
CELL1
THM/SHDN
REF
SETI
VADJ
STATUS
CCV
CCI
MAX745
DCIN
GND
IBAT
Switch-Mode Lithium-Ion
PGND
BATT
DLO
BST
DHI
CS
VL
LX
____________________________Features
Pin Configuration appears on last page.
________________________Applications
Charges 1 to 4 Lithium-Ion Battery Cells
±0.75% Voltage-Regulation Accuracy
Provides up to 4A without Excessive Heating
90% Efficient
Uses Low-Cost Set Resistors and
N-Channel Switch
Up to 24V Input
Up to 18V Maximum Battery Voltage
300kHz PWM Operation: Low-Noise,
Small Components
Stand-Alone Operation; No Microcontroller
Needed
Using 1% Resistors
Lithium-Ion Battery Packs
Desktop Cradle Chargers
Cellular Phones
Notebook Computers
Hand-Held Instruments
Battery-Charger
N
N
R
SENSE
I
VOUT
1–4 Li+ CELLS
(UP TO 18V)
CHARGE
1
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