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MAX1757

更新时间： 2024-11-14 22:57:59
品牌 Logo 应用领域
美信 - MAXIM 电池开关
页数 文件大小 规格书
17页 219K
描述
Stand-Alone, Switch-Mode Li Battery Charger with Internal 14V Switch

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MAX1757 数据手册

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19-1754; Rev 0; 6/00  
Stand-Alone, Switch-Mode  
Li+ Battery Charger with Internal 14V Switch  
General Description  
Features  
o Stand-Alone Charger for Up to 3 Li+ Batteries  
The MAX1757 is a switch-mode lithium-ion (Li+) battery  
charger that charges one to three cells. It provides a  
regulated charging current accurate to 1ꢀ0 and a  
regulated voltage with only a ꢀ.ꢁ0 total voltage error  
at the battery terminals. The internal high-side switch  
delivers a programmable current of up to 1.5A to  
charge the battery. The built-in safety timer automatical-  
ly terminates charging once the adjustable time limit  
has been reached.  
o ±±0.8 Batterꢀ ꢁegꢂlation ꢃoltage Aꢄꢄꢂraꢄꢀ  
o Low-Dropoꢂt 9.8 Dꢂtꢀ Cꢀꢄle  
o Safelꢀ Preꢄharges Near-Dead Cells  
o Continꢂoꢂs ꢃoltage and Temperatꢂre Monitoring  
o ±01µA Shꢂtdown Batterꢀ Cꢂrrent  
o Inpꢂt ꢃoltage Up to 14ꢃ  
The MAX1757 regulates the voltage set point and  
charging current using two loops that work together to  
transition smoothly between voltage and current regula-  
tion. An additional control loop monitors the total cur-  
rent drawn from the input source (charging + system)  
and by automatically reducing battery-charging current  
prevents overload of the input supply, allowing the use  
of a low-cost wall adapter.  
o Up to 105A Programmable Charge Cꢂrrent  
o Inpꢂt Cꢂrrent Limiting  
o Spaꢄe-Saving 2.-Pin SSOP  
o 3±±kHz PWM Osꢄillator ꢁedꢂꢄes Noise  
The per-cell battery regulation voltage is set between  
4.ꢀV and 4.4V using standard 10 resistors. The num-  
ber of cells is set from 1 to 3 by pin strapping. Battery  
temperature is monitored by an external thermistor to  
prevent charging outside the acceptable temperature  
range.  
The MAX1757 is available in a space-saving 2ꢁ-pin  
SSOP package. Use the MAX1757EVKIT to help reduce  
design time. For a stand-alone charger with a 2ꢁV  
switch, refer to the MAX175ꢁ data sheet. For a charger  
controller capable of up to 4A charging current, refer to  
the MAX1737 data sheet.  
Ordering Information  
PAꢁT  
TEMP0 ꢁANGE  
PIN-PACKAGE  
MAX1757EAI  
-4ꢀ°C to +ꢁ5°C  
2ꢁ SSOP  
Typical Operating Circuit  
V
IN  
6V to 14V  
DCIN  
CSSP  
CSSN  
SYSTEM  
LOAD  
REF  
HSD  
LX  
________________________Applications  
MAX1757  
Li+ Battery Packs  
PDAs  
ISETOUT  
BST  
VL  
Notebook Computers  
Hand-Held Instruments  
Desktop Cradle Chargers  
ISETIN  
CELL  
Pin Configuration  
PGND  
CS  
TOP VIEW  
VL  
ISETTIN  
ISETOUT  
THM  
1
2
3
4
5
6
7
8
9
28 DCIN  
27 CSSP  
26 CSSN  
25 CCV  
24 CCI  
VADJ  
BATT  
THM  
CCS  
CCI  
Li+ BATTERY  
1 TO 3 CELLS  
REF  
THERM  
MAX1757  
GND  
23 CCS  
VADJ  
22 BST  
BATT  
21 CS  
HSD  
20 LX  
CCV  
FASTCHG  
FULLCHG  
FAULT  
HSD 10  
CELL 11  
19 LX  
TIMER1  
TIMER2  
SHDN  
18 PGND  
17 SHDN  
16 FULLCHG  
15 FASTCHG  
TIMER1 12  
TIMER2 13  
FAULT 14  
ON  
OFF  
GND  
SSOP  
________________________________________________________________ Maxim Integrated Products  
1
For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800.  
For small orders, phone 1-800-835-8769.  
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