LTC4012-3_15 Datasheet, PDF (7/28 Pages) Linear Technology – High Efficiency, Multi-Chemistry Battery Charger with PowerPath Control

LTC4012-3
Typical Performance Characteristics
(T_A = 25°C unless otherwise noted. L = IHLP-2525 6.8µH)
PWM Frequency vs Duty Cycle
600
I_CHG = 750mA
500
400
300
200
100
0
0
CLP = 6V
CLP = 12V
CLP = 20V
CLP = 25V
20
40
60
80 100
DUTY CYCLE (%)
4012-3 G13
PWM Frequency
vs Charge Current
600
500
400
CLP = 15V
300 ^RSENSE ^{= 33mΩ}
R_IN = 3.01k
200
BAT = 5V
BAT = 12V
100
BAT = 14.5V
0
0 0.5 1.0 1.5 2.0 2.5 3.0
CHARGE CURRENT (A)
4012-3 G14
Battery Shutdown Current
25
20
DC1256-CLASS
APPLICATION
DCIN = 0V
15
LTC4012-3,
ALL PINS
10
DCIN = 0V
5
LTC4012-3,
BAT PINS
DCIN = 20V
0
0
5
10
15
20
25
BATTERY VOLTAGE (V)
4012-3 G15
INFET Response Time to
DCIN Short to Ground
V_GS = 0V PFET V_GS (1V/DIV)
I_DCIN, REVERSE
(5A/DIV)
0A
TIME (1µs/DIV)
DCIN = 15V
INFET = Si7423DN
I_OUT = <50mA
V_OUT = 12.3V
C_OUT = 0.27F
4012-3 G16
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