FEATURES
s
LT1511
Constant-Current/
Constant-Voltage 3A Battery
Charger with Input Current Limiting
DESCRIPTIO
The LT
廬
1511 current mode PWM battery charger is the
simplest, most efficient solution to fast charge modern
rechargeable batteries including lithium-ion (Li-Ion), nickel-
metal-hydride (NiMH) and nickel-cadmium (NiCd) that
require constant-current and/or constant-voltage charg-
ing. The internal switch is capable of delivering 3A* DC
current (4A peak current). Full-charging current can be
programmed by resistors or a DAC to within 5%. With 0.5%
reference voltage accuracy, the LT1511 meets the critical
constant-voltage charging requirement for Li-Ion cells.
A third control loop is provided to regulate the current
drawn from the AC adapter. This allows simultaneous
operation of the equipment and battery charging without
overloading the adapter. Charging current is reduced to
keep the adapter current within specified levels.
The LT1511 can charge batteries ranging from 1V to 20V.
Ground sensing of current is not required and the battery鈥檚
negative terminal can be tied directly to ground. A saturat-
ing switch running at 200kHz gives high charging effi-
ciency and small inductor size. A blocking diode is not
required between the chip and the battery because the
chip goes into sleep mode and drains only 3碌A(chǔ) when the
wall adapter is unplugged.
R7
鈥?/div>
500鈩?/div>
GND
SW
BOOST
LT1511
COMP1
200pF
SPIN
OVP SENSE
CLP
CLN
V
CC
C1
1碌F
D3
MBRD340
R
S4
鈥?/div>
ADAPTER
CURRENT SENSE
V
IN
(ADAPTER INPUT)
11V TO 28V
TO MAIN
SYSTEM POWER
R5
鈥?/div>
UNDERVOLTAGE
LOCKOUT
R6
5k
300鈩?/div>
1k
0.33碌F
C
PROG
1碌F
R
PROG
4.93k
1%
s
s
s
s
s
s
s
s
s
s
Simple Design to Charge NiCd, NiMH and Lithium
Rechargeable Batteries鈥擟harging Current
Programmed by Resistors or DAC
Adapter Current Loop Allows Maximum Possible
Charging Current During Computer Use
Precision 0.5% Accuracy for Voltage Mode Charging
High Efficiency Current Mode PWM with 4A Internal
Switch
5% Charging Current Accuracy
Adjustable Undervoltage Lockout
Automatic Shutdown When AC Adapter is Removed
Low Reverse Battery Drain Current: 3碌A(chǔ)
Current Sensing Can Be at Either Terminal of the Battery
Charging Current Soft-Start
Shutdown Control
APPLICATIO S
s
s
Chargers for NiCd, NiMH, Lead-Acid, Lithium
Rechargeable Batteries
Switching Regulators with Precision Current Limit
, LTC and LT are registered trademarks of Linear Technology Corporation.
*See LT1510 for 1.5A Charger
TYPICAL APPLICATIO
D1
MBRD340
L1**
20碌H
C2
0.47碌F
+
10碌F
+
C
IN
*
10碌F
D2
MBR0540T
UV
PROG
V
C
BAT
R
S2
200鈩?/div>
1%
NOTE: COMPLETE LITHIUM-ION CHARGER,
NO TERMINATION REQUIRED. R
S4
, R7
AND C1 ARE OPTIONAL FOR I
IN
LIMITING
*TOKIN OR UNITED CHEMI-CON/MARCON
CERAMIC SURFACE MOUNT
**20碌H COILTRONICS CTX20-4
鈥?/div>
SEE APPLICATIONS INFORMATION FOR
INPUT CURRENT LIMIT AND UNDERVOLTAGE LOCKOUT
R
S3
200鈩?/div>
1%
R
S1
0.033鈩?/div>
BATTERY CURRENT
SENSE
R3
390k
0.25%
BATTERY
VOLTAGE SENSE
R4
162k
0.25%
+
C
OUT
22碌F
TANT
50pF
Figure 1. 3A Lithium-Ion Battery Charger
U
U
U
+
4.2V
+
4.2V
V
BAT
2 Li-Ion
1511 鈥?F01
1
LT1511CSW 產(chǎn)品屬性
LT1511
32
集成電路 (IC)
PMIC - 電池管理
-
充電管理
鋰離子，鎳鎘，鎳氫
6 V ~ 28 V
0°C ~ 70°C
表面貼裝
24-SOIC（0.295"，7.50mm 寬）
24-SOIC
管件
LT1511CSW相關(guān)型號(hào)PDF文件下載
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