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| 型号： | MAX8672ETD+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 1/17页 |
| 文件大小： | 0K |
| 描述： | IC MANAGE NIMH BACKUP 14-TDFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 功能： | 备份管理 |
| 电池化学： | 镍金属氢化物 |
| 电源电压： | 2.7 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 14-WFDFN 裸露焊盘 |
| 供应商设备封装： | 14-TDFN-EP（3x3） |
| 包装： | 带卷 (TR) |
19-0653; Rev 0; 11/06
ATION
EVALU
AVAIL
KIT
ABLE
Complete Backup Management
IC for NiMH Batteries
General Description
Features
The MAX8672 complete power manager for backup
batteries in smart devices offers feature-programmable
battery charging and main-system backup. The device
includes a charger for 1- or 2-cell NiMH backup batter-
ies. A low-quiescent current synchronous-rectified
boost converter and LDO supply up to 20mA during
system backup. The BST output is internally set to regu-
late at 3.05V. The MAX8672 LDO is powered from the
boost converter output and is adjustable from 1.5V to
3.05V.
The MAX8672 features programmable charge current,
undervoltage lockout (UVLO), and maximum cell volt-
age. Charging is controlled by both a timer and ther-
mistor monitor. Battery UVLO prevents excessive
battery discharge and keeps inactive-battery drain cur-
rent below 50nA. In addition, both LDO and boost con-
verter outputs block reverse current so that diodes are
o
o
o
o
o
o
o
o
o
o
Charges 1- or 2-Cell NiMH Backup Batteries
Programmable Charge Current
DC Trickle Charge Mode for Maximum Cell Life
Deep-Recovery Charge Restores Cells < 1V
Programmable Charge Timer
Programmable Charge-Voltage Limit and Battery
UVLO
Reverse Current Blocking on BATT, LDO, and
Boost—No Diodes Needed
No Battery Drain When Off (< 50nA)
Thermistor Sensing Disables Standard Charge
Battery Restart Charge Threshold Prevents
Overcharge
Ordering Information
not needed when connecting these outputs directly to
PART
PIN-PACKAGE
PKG CODE
system supplies. The MAX8672 requires that a valid
system supply be present before system backup oper-
ation can occur.
The MAX8672 is available in a 14-pin, 3mm x 3mm TDFN
package and is rated for -40°C to +85°C operation.
Applications
MAX8672ETD+T 14 TDFN-14 (3mm x 3mm) T14334+2
The MAX8672 operates in the -40°C to +85°C extended
operating temperature range.
+Denotes lead-free package.
Typical Operating Circuit
PDA, Palmtop, and Wireless Handhelds
CT
THRM
Smart Cell Phones
MAX8672
TOP VIEW
Pin Configuration
2.7V TO 5.5V INPUT
IN
DR
CHGI
TRKI
CHGV
14
13
12
11
10
9
8
FBL
BATT
MAX8672
BACKUP BATTERY
CONNECTION
LDO
1.75V
UV
1
2
3
4
5
6
7
BST
3.05V
GND
TDFN
(3mm x 3mm)
LX
________________________________________________________________ Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
1
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