參數(shù)資料
型號: LTC4052-42
廠商: Linear Integrated Systems
英文描述: Lithium-Ion Battery Pulse Charger with Overcurrent Protection
中文描述: 鋰離子電池脈沖充電器與過流保護(hù)
文件頁數(shù): 4/8頁
文件大?。?/td> 166K
代理商: LTC4052-42
LTC4052-4.2
4
405242i
BLOCK DIAGRA
W
The LTC4052 is a complete lithium-ion battery pulse
charger with an internal 0.35
N-MOSFET switch driven
by an internal charge pump.
The charge current is set by
the current limit of the input supply (wall adapter).
An
external R
SENSE
sets the maximum allowable charge
overcurrent and prevents a wall adapter with the wrong
current limit from damaging the battery. If the current limit
of the input supply is above I
MAX
, the charger will imme-
diately terminate charging and will retry after 640ms
(C
TIMER
= 0.1
μ
F). If the battery is disconnected while in
fast charge mode, the charge pump will be turned off when
the voltage at the BAT pin rises above 4.7V and turned back
on when the voltage drops below the float voltage.
A charge cycle begins when the voltage at the V
IN
pin rises
above the BAT pin by 45mV. The charger will go into trickle
charge mode if the battery voltage is below 2.45V. The
trickle charge current is preset to 24mA and is provided by
an internal current source. In trickle mode, both the pass
transistor and charge pump are off.
OPERATIOU
4052 BD
+
+
+
+
+
+
V
FLOAT
V
RECHRG
V
MIN
V
MAX
CHARGE
PUMP
TRIPLER
LOGIC
+
TIMERS
8
2
5
4
3
7
1
+
+
V
IN
SENSE
GATE
BAT
105mV
45mV
TRICKLE
FAST
1.23V
1.23V
THERMAL
SHUTDOWN
REFERENCE
OSCILLATOR
100ms
FILTER
6
40
μ
A
V
IN
GND
TIMER
CHRG
SLEEP
ACPR
CLK
STOP
C
/10
TEMP
I
MAX
BAT
24mA
10m
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參數(shù)描述
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