MAX745EAP Datasheet Download

Part No.:
MAX745EAP
Download:
Download Datasheet
Description:
[Switch-Mode Lithium-Ion Battery-Charger]
File Size:
93 K
Page:
8 Pages
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Manufacturer:
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
PCB Prototype
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19-1182; Rev 2; 12/98
ANUAL
N KIT M EET
ATIO
SH
EVALU
S DATA
OLLOW
F
Switch-Mode Lithium-Ion
Battery-Charger
____________________________Features
o
Charges 1 to 4 Lithium-Ion Battery Cells
o
±0.75% Voltage-Regulation Accuracy
Using 1% Resistors
o
Provides up to 4A without Excessive Heating
o
90% Efficient
o
Uses Low-Cost Set Resistors and
N-Channel Switch
o
Up to 24V Input
o
Up to 18V Maximum Battery Voltage
o
300kHz PWM Operation: Low-Noise,
Small Components
o
Stand-Alone Operation; No Microcontroller
Needed
General Description
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.
MAX745
________________________Applications
Lithium-Ion Battery Packs
Desktop Cradle Chargers
Cellular Phones
Notebook Computers
Hand-Held Instruments
Pin Configuration appears on last page.
Ordering Information
PART
MAX745C/D
MAX745EAP
TEMP. RANGE
0°C to +70°C
-40°C to +85°C
PIN-PACKAGE
Dice*
20 SSOP
*Dice
are tested at T
A
= +25°C.
___________________________________________________Typical Operating Circuit
V
IN
(UP TO 24V)
DCIN
VL
BST
DHI
N
CELL
COUNT
SELECT
ON
OFF
CELL0
CELL1
THM/SHDN
REF
SETI
VADJ
MAX745
LX
DLO
N
I
CHARGE
CS
R
SENSE
SET PER
CELL VOLTAGE
WITH 1% RESISTORS
STATUS
BATT
CCV
CCI
GND
IBAT
PGND
VOUT
1–4 Li+ CELLS
(UP TO 18V)
SMBus is a trademark of Intel Corp.
________________________________________________________________
Maxim Integrated Products
1
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.