FEATURES
s
LT1769
Constant-Current/
Constant-Voltage 2A Battery
Charger with Input Current Limiting
DESCRIPTIO
The LT
廬
1769 current mode PWM battery charger is a
simple, efficient solution to fast charge modern recharge-
able batteries including lithium-ion (Li-Ion), nickel-metal-
hydride (NiMH) and nickel-cadmium (NiCd) that require
constant-current and/or constant-voltage charging. The
internal switch is capable of delivering 2A** DC current
(3A peak current). Charge current can be programmed by
resistors or a DAC to within 5%. With 0.5% reference voltage
accuracy, the LT1769 meets the critical constant-voltage
charging requirement for Li-Ion cells.
A third control loop is provided to regulate the current
drawn from the input AC adapter. This allows simulta-
neous operation of the equipment and battery charging
without overloading the adapter. Charge current is reduced
to keep the adapter current below specified levels.
The LT1769 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
LT1769
COMP1
2nF
10k
SPIN
OVP SENSE
UV
PROG
V
C
BAT
R
S2
200鈩?/div>
1%
R3
+
390k
0.25%
BATTERY
VOLTAGE SENSE
R4
162k
0.25%
V
BAT
C
OUT
22碌F
TANT
8.4V
Li-Ion
1511 鈥?F01
s
s
s
s
s
s
s
s
s
s
s
Simple Solution to Charge NiCd, NiMH and Lithium
Rechargeable Batteries鈥擟harging Current
Programmed by Resistors or DAC
Adapter Current Limit Allows Maximum Possible
Charging Current During System Use*
Precision 0.5% Accuracy for Voltage Mode Charging
High Efficiency Current Mode PWM with 3A Internal
Switch
5% Charge 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
Available in 28-Lead Narrow SSOP Package
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.
*US patent number 5,723,970
**See LT1510 for 1.5A charger; see LT1511 for 3A charger
TYPICAL APPLICATIO
D1
鈥犫€?/div>
SS24
CLP
CLN
V
CC
C1
1碌F
C
IN
*
15碌F
C2
0.47碌F
L1**
22碌H
D2
1N4148
300鈩?/div>
0.33碌F
C
PROG
1碌F
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
**22碌H SUMIDA CDRH125
鈥?/div>
SEE APPLICATIONS INFORMATION FOR
INPUT CURRENT LIMIT AND UNDERVOLTAGE LOCKOUT
鈥犫€?/div>
GENERAL SEMICONDUCTOR. FOR T
J
LESS THEN 100擄C
MBRS130LT3 CAN BE USED
R
S3
200鈩?/div>
1%
R
S1
0.05鈩?/div>
BATTERY CURRENT
SENSE
Figure 1. 2A Lithium-Ion Battery Charger
U
U
U
D3
鈥犫€?/div>
SS24
R
S4
鈥?/div>
ADAPTER
CURRENT SENSE
V
IN
(ADAPTER INPUT)
11V TO 28V
TO MAIN
SYSTEM LOAD
R5
鈥?/div>
UNDERVOLTAGE
LOCKOUT
R6
5k
R
PROG
4.93k
1%
1
LT1769IGN 產(chǎn)品屬性
LT1769
49
集成電路 (IC)
PMIC - 電池管理
-
充電管理
鉛酸，鋰離子，鎳鎘，鎳氫
8 V ~ 25 V
-40°C ~ 85°C
表面貼裝
28-SSOP（0.154"，3.90mm 寬）
28-SSOP
管件
LT1769IGN相關(guān)型號PDF文件下載
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