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參數(shù)資料
| 型號(hào)： | LTC1505 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Constant-Current/Voltage High Efficiency Battery Charger(恒定電流/電壓,高效率電池電荷控制器) |
| 中文描述： | Constant-Current/Voltage高效電池充電器（恒定電流/電壓，高效率電池電荷控制器） |
| 文件頁(yè)數(shù)： | 1/16頁(yè) |
| 文件大?。?/td> | 197K |
| 代理商： | LTC1505 |
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1
LT1505
TYPICAL APPLICATIO
N
U
DESCRIPTIOU
The LT
1505 PWM battery charger controller fast charges
multiple battery chemistries including lithium-ion (Li-Ion),
nickel-metal-hydride (NiMH) and nickel-cadmium (NiCd)
using constant-current or constant-voltage control. Maxi-
mum current can be easily programmed by resistors or a
DAC. The constant-voltage output can be selected for 3 or 4
series Li-Ion cells with 0.5% accuracy.
A third control loop limits the current drawn from the AC
adapter during charging*. This allows simultaneous opera-
tion of the equipment and fast battery charging without over-
loading the AC adapter.
The LT1505 can charge batteries ranging from 2.5V to 20V
with dropout voltage as low as 0.5V. Synchronous
N-channel FETs switching at 200kHz give high efficiency
and allow small inductor size. A diode is not required in
series with the battery because the charger automatically
enters a 10
μ
A sleep mode when the wall adapter is un-
plugged. A logic output indicates Li-Ion full charge when
current drops to 20% of the programmed value.
The LT1505 is available in a 28-pin SSOP package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
*US Patent No. 5,723,970
FEATURES
APPLICATIU
Constant-Current/Voltage
High Efficiency Battery Charger
Figure 1. Low Dropout 4A Lithium-Ion Battery Charger
I
Simple Charging of Li-Ion, NiMH and NiCd Batteries
I
Very High Efficiency: Up to 97%
I
Precision 0.5% Charging Voltage Accuracy
I
Preset Battery Voltages: 12.3V, 12.6V,
16.4V and 16.8V
I
5% Charging Current Accuracy
I
Charging Current Programmed by Resistor or DAC
I
0.5V Dropout Voltage, Duty Cycle > 99.5%
I
AC Adapter Current Limit* Maximizes Charging Rate
I
Flag Indicates Li-Ion Charge Completion
I
Auto Shutdown with Adapter Removal
I
Only 10
μ
A Battery Drain When Idle
I
Synchronizable Up to 280kHz
I
Notebook Computers
I
Portable Instruments
I
Chargers for Li-Ion, NiMH, NiCd and Lead Acid
Rechargeable Batteries
5
C
PROG
μ
F
R
4.93k
1%
300
C7
0.68
μ
F
C6
0.1
μ
F
C3
2.2
μ
F
C
OUT
22
μ
F
25V
×
2
C2
0.68
μ
F
L1
15
μ
H
V
BAT
12.6V
BATTERY
NOTE: DBODY IS THE BODY DIODE OF M3
C
: SANYO OS-CON
L1: SUMIDA CDRH127-150
(CAN BE FROM 10
μ
H TO 30
μ
H)
M1
Si4412
M2
Si4412
D4
MBRS140
D2
MMSD4148T1
D3
MMSD4148T1
R7
500
100k
R5
4k
R1
1k
R6
4k
*BODY DIODE
POLARITY MUST
BE AS SHOWN
R
S4
0.025
M3
Si4435
DBODY*
TO
V
IN
(FROM
ADAPTER)
R
S1
0.025
1505 F01
0.33
μ
F
R
X4
3k
R
S2
200
1%
R
S3
200
1%
C
IN
47
μ
F
35V
C1
1
μ
F
C4
0.1
μ
F
BAT2 BAT
SENSE
LT1505
V
CC
BOOST
BOOSTC
SPIN
PGND
AGND
4.1V
4.2V
V
FB
3 CELL
PROG
V
C
BGATE
COMP1
CAP
FLAG
SHDN
SYNC
UV
INFET
SW
TGATE
GBIAS
CLP
CLN
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