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| 型号： | MAX8672ETD+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 8/17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) |
Complete Backup Management
IC for NiMH Batteries
REF
100k Ω
THRM
Detailed Description
The MAX8672 is a compact IC for managing backup-
battery charging and utilization in PDAs and other smart
handheld devices. The IC contains three major blocks:
OK
HOT
a charger for 1 or 2 NiMH coin cells; a small, very-low-
quiescent current step-up DC-DC converter that gener-
CT
OK
COLD
V CHG
COMP
2X
CHGV
ates a boosted backup supply; and an LDO that can
supply a 2nd backup voltage to an additional system
block (typically low-voltage RAM).
TIMER
+ LOGIC
The MAX8672 does not have a logic control signal for
activating backup. The main system supplies are
IN
DR
CHGI
V TRK
COMP
V RSTRT
COMP
A=2
V DR
directly connected to the BST and LDO outputs, where
LDO and BST are programmed to regulate just below
system supply voltages. When system supply voltages
exceed the programmed BST and LDO output voltage,
BST and LDO are pulled up by the system supplies
and do not sink current (BST sinks 80μA for chip opera-
tion). When the system supplies fall below the pro-
grammed output voltage, BST and LDO operate to
maintain system voltages at the programmed values.
The LDO and boost converter do not operate any differ-
ently in the system’s running (and charging) state than
TRKI
BATT
V BATT / 2
R
COMP
A=1
R
they do in the backup state. The LDO and BST error
amplifiers constantly monitor their outputs in both cases.
The MAX8672 has three states:
? System Active/Charging . With a valid V IN (greater
than 2.7V and also greater than V BATT ), and a valid
LDO
FBL
V BST (greater than 2.35V), the battery charges.
LDO and BST are active and available for system
UV
OFF
HYST*
MAX8672
3.05V
LDO
HYST*: 0.85V
HYSTERESIS,
COMPARATOR
?
backup. Charging and system backup are indepen-
dent functions.
Backup . When the system supply voltages have
fallen below the programmed output voltage, BST
and LDO maintain their output voltages and are
sourced by the battery. Under these conditions,
HI AT 3.05V,
LO AT 2.2V
battery charging has ceased, but this is not a
requirement for the backup state.
AND
AND HI
?
Off . When the battery voltage has fallen below the
UVLO threshold (V BATT(UV) ) and V IN is not valid,
the IC turns off and all outputs are latched off. If
AND LO
V BATT recovers to above V BATT(UV) , charging does
LX
LOW I Q
BOOST
BST
not resume until both a valid V IN and V BST are pre-
sent. Negligible battery current (less than 50nA
leakage) is drawn in this state.
CONVERTER
PFM
Figure 1. MAX8672 Functional Block Diagram
8
_______________________________________________________________________________________
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