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參數(shù)資料
| 型號： | LTC3711 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | 4A, High Efficiency, Standalone Li Battery Charger |
| 中文描述： | 第4A，高效，獨(dú)立鋰電池充電器 |
| 文件頁數(shù)： | 1/20頁 |
| 文件大?。?/td> | 241K |
| 代理商： | LTC3711 |
1
LTC4007
4007i
4A, High Efficiency,
Standalone Li Battery Charger
January 2003
I
Complete Charger Controller for 3- or 4-Cell
Lithium-Ion Batteries
I
High Conversion Efficiency: Up to 96%
I
Output Currents Exceeding 4A
I
±
0.8% Charging Voltage Accuracy
I
Built-In Charge Termination for Li-Ion Batteries
I
AC Adapter Current Limiting Maximizes Charge Rate*
I
Thermistor Input for Temperature Qualified Charging
I
Wide Input Voltage Range: 6V to 28V
I
0.5V Dropout Voltage; Maximum Duty Cycle: 98%
I
Programmable Charge Current:
±
5% Accuracy
I
Indicator Outputs for Charging, C/10 Current
Detection, AC Adapter Present, Low Battery, Input
Current Limiting and Faults
I
Charging Current Monitor Output
I
Available in a 24-Pin Narrow SSOP Package
APPLICATIOU
I
Notebook Computers
I
Portable Instruments
I
Battery-Backup Systems
I
Standalone Li-Ion Chargers
, LTC and LT are registered trademarks of Linear Technology Corporation.
*U.S. Patent No. 5,723,970
FEATURES
DESCRIPTIO
N
U
The LTC
4007 is a complete constant-current/constant-
voltage charger controller for 3- or 4-cell lithium-ion
batteries. The PWM controller uses a synchronous, quasi-
constant frequency, constant off-time architecture that
will not generate audible noise even when using ceramic
capacitors. Charging current is programmable to
±
5%
accuracy using a programming resistor. Charging current
can also be monitored as a voltage across the program-
ming resistor.
The output float voltage is pin programmed for cell count
(3 cells or 4 cells) and chemistry (4.2V/4.1V). A timer,
programmed by an external resistor, sets the total charge
time. Charging is automatically restarted when cell voltage
falls below 3.9V/cell.
LTC4007 includes a thermistor input, which suspends
charging if an unsafe temperature condition is detected. If
the cell voltage is less than 2.5V, a low-battery indicator
asserts and can be used to program a trickle charge cur-
rent to safely charge depleted batteries. The FAULT pin is
also asserted and charging terminates if the low-battery
condition persists for more than 1/4 of the total charge time.
Final Electrical Specifications
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
TYPICAL APPLICATIO
U
12.6V, 4A Li-Ion Battery Charger
3C4C
CHEM
LOBAT
I
CL
ACP
SHDN
FAULT
CHG
FLAG
NTC
R
T
LOBAT
I
CL
ACP
SHDN
FAULT
CHG
FLAG
DCIN
INFET
CLP
CLN
TGATE
BGATE
PGND
CSP
BAT
PROG
ITH
GND
LTC4007
32.4k
309k
0.47
μ
F
THERMISTOR
10k
NTC
TIMING RESISTOR
(~2 HOURS)
100k
100k
100k
V
LOGIC
DCIN
0V TO 28V
0.1
μ
F
INPUT SWITCH
15nF
Q1
Q2
20
μ
F
10
μ
H
4.9k
3.01k
3.01k
0.025
0.025
20
μ
F
Li-Ion
BATTERY
CHARGING
CURRENT
MONITOR
Q1: Si4431DY
Q2: FDC6459
SYSTEM
LOAD
0.12
μ
F
6.04k
26.7k
0.0047
μ
F
4007 TA01
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| LTC3711EGN | 功能描述:IC REG CTRLR BUCK PWM CM 24-SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:96% 電源電壓:4 V ~ 36 V 降壓:無 升壓:是 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:24-WQFN 裸露焊盤 包裝:帶卷 (TR) |
| LTC3711EGN#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 24-SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:96% 電源電壓:4 V ~ 36 V 降壓:無 升壓:是 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:24-WQFN 裸露焊盤 包裝:帶卷 (TR) |
| LTC3711EGN#TR | 功能描述:IC REG CTRLR BUCK PWM CM 24-SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:96% 電源電壓:4 V ~ 36 V 降壓:無 升壓:是 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:24-WQFN 裸露焊盤 包裝:帶卷 (TR) |
| LTC3711EGN#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 24-SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:96% 電源電壓:4 V ~ 36 V 降壓:無 升壓:是 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:24-WQFN 裸露焊盤 包裝:帶卷 (TR) |
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