參數(shù)資料
型號(hào)： LT1769IGN
廠商： LINEAR TECHNOLOGY CORP
元件分類： 電源管理
英文描述： Constant-Current/ Constant-Voltage 2A Battery Charger with Input Current Limiting
中文描述： 2-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO28
封裝： 0.150 INCH, PLASTIC, SSOP-28
文件頁(yè)數(shù)： 1/16頁(yè)
文件大?。?/td> 214K
代理商： LT1769IGN
1
LT1769
Constant-Current/
Constant-Voltage 2A Battery
Charger with Input Current Limiting
DESCRIPTIOU
I
Simple Solution to Charge NiCd, NiMH and Lithium
Rechargeable Batteries—Charging Current
Programmed by Resistors or DAC
I
Adapter Current Limit Allows Maximum Possible
Charging Current During System Use*
I
Precision 0.5% Accuracy for Voltage Mode Charging
I
High Efficiency Current Mode PWM with 3A Internal
Switch
I
5% Charge Current Accuracy
I
Adjustable Undervoltage Lockout
I
Automatic Shutdown When AC Adapter is Removed
I
Low Reverse Battery Drain Current: 3
μ
A
I
Current Sensing Can Be at Either Terminal of the Battery
I
Charging Current Soft Start
I
Shutdown Control
I
Available in 28-Lead Narrow SSOP Package
The LT
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’s
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
μ
A when the
wall adapter is unplugged.
Figure 1. 2A Lithium-Ion Battery Charger
I
Chargers for NiCd, NiMH, Lead-Acid, Lithium
Rechargeable Batteries
I
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
FEATURES
APPLICATIU
TYPICAL APPLICATIO
U
SW
BOOST
COMP1
CLN
V
CC
UV
OVP SENSE
BAT
C1
1
μ
F
R
ADAPTER
CURRENT SENSE
R7
500
R5
UNDERVOLTAGE
LOCKOUT
R6
5k
V
(ADAPTER INPUT)
11V TO 28V
V
BAT
C
PROG
1
μ
C
IN
*
15
μ
F
300
R
4.93k
1%
0.33
μ
F
C2
0.47
μ
F
R
S3
200
1%
R
S2
200
1%
L1**
22
μ
H
D2
1N4148
2nF
10k
R
S1
0.05
BATTERY CURRENT
SENSE
R3
390k
0.25%
BATTERY
VOLTAGE SENSE
R4
162k
0.25%
C
OUT
22
μ
F
TANT
8.4V
Li-Ion
LT1769
NOTE: COMPLETE LITHIUM-ION CHARGER,
NO TERMINATION REQUIRED. R
, R7
AND C1 ARE OPTIONAL FOR I
LIMITING
*TOKIN OR UNITED CHEMI-CON/MARCON
CERAMIC SURFACE MOUNT
**22
μ
H SUMIDA CDRH125
SEE APPLICATIONS INFORMATION FOR
GENERAL SEMICONDUCTOR. FOR T
J
LESS THEN 100
°
C
MBRS130LT3 CAN BE USED
TO MAIN
SYSTEM LOAD
SPIN
D1
SS24
GND
CLP
D3
SS24
1511 F01
PROG
V
C
+
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