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参数资料
| 型号： | LTC4012IUF-2#PBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, 633 kHz SWITCHING FREQ-MAX, PQCC20 |
| 封装： | 4 X 4 MM, 0.75 MM HEIGHT, LEAD FREE, PLASTIC, MO-220WGGD-1, QFN-20 |
| 文件页数： | 26/28页 |
| 文件大小： | 381K |
| 代理商： | LTC4012IUF-2#PBF |
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4012fa
LTC4012/
LTC4012-1/LTC4012-2
typical perForMance characteristics
PWM Frequency vs Duty Cycle
Gate Drive Non-Overlap
Battery Shutdown Current
Charge Current Line Regulation
Input Current Limit
DCIN PIN VOLTAGE (V)
5
–0.5
CHARGE
CURRENT
ERROR
(%)
–0.4
–0.2
–0.1
0
0.5
0.2
10
15
4012 G08
–0.3
0.3
0.4
0.1
20
25
ICHG = 1A
ICHG = 2A
ICHG = 3A
BAT = 6V
RSENSE = 33m
RIN = 3.01k
Charge Current Load Regulation
BATTERY VOLTAGE (V)
11.0
CHARGE
CURRENT
(A)
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
–0.5
12.6
4012 G09
11.4
11.8
12.2
13.0
ICHG = 3A
ICHG = 2A
ICHG = 1A
DCIN = 20V
RSENSE = 33m
RIN = 3.01k
SYSTEM LOAD (A)
0
CURRENT
(A)
0.5
1.0
1.5
2.5
4012 G10
0
–0.5
–1.0
0.5
1.0
2.0
2.5
3.0
IIN
ICHG
ICL STATE
2.5A BULK CHARGE
2.1A INPUT CURRENT LIMIT
PWM Soft-Start
ICHG
2A/DIV
TIME (500s/DIV)
4012 G11
ITH
1V/DIV
PROG
1V/DIV
SHDN
5V/DIV
TIME (80ns/DIV)
EXTERNAL
FET
DRIVE
(1V
/DIV)
4012 G12
TGATE
BGATE
DUTY CYCLE (%)
0
PWM
FREQUENCY
(kHz)
100
200
300
400
500
600
20
40
60
80
4012 G13
100
CLP = 6V
CLP = 12V
CLP = 20V
CLP = 25V
ICHG = 750mA
PWM Frequency
vs Charge Current
CHARGE CURRENT (A)
0
PWM
FREQUENCY
(kHz)
100
200
300
400
600
0.5
1.0
1.5
2.0
4012 G14
2.5
3.0
500
BAT = 14.5V
BAT = 12V
BAT = 5V
CLP = 15V
RSENSE = 33m
RIN = 3.01k
BATTERY VOLTAGE (V)
0
BATTERY
CURRENT
(A)
5
10
15
25
5
10
15
4012 G15
20
25
20
DC1256-CLASS
APPLICATION
DCIN = 0V
LTC4012,
ALL PINS
DCIN = 0V
LTC4012,
BAT PINS
DCIN = 20V
(TA = 25°C unless otherwise noted. L = IHLP-2525 6.8H)
INFET Response Time to
DCIN Short to Ground
0A
VGS = 0V
TIME (1s/DIV)
DCIN = 15V
INFET = Si7423DN
IOUT = <50mA
VOUT = 12.3V
COUT = 0.27F
4012 G16
PFET VGS (1V/DIV)
IDCIN, REVERSE
(5A/DIV)
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