Datasheet

LTC3852
7
3852f
TYPICAL PERFORMANCE CHARACTERISTICS
Controller Oscillator Frequency
vs Temperature
Controller Undervoltage Lockout
Threshold (INTV
CC
) vs Temperature
Shutdown Input DC Supply Current
vs Input Voltage Controller Only
Shutdown Input DC Supply Current
vs Temperature Controller Only
Input DC Supply Current
vs Temperature Controller Only
TEMPERATURE (°C)
–50
600
700
900
25 75
3852 G22
500
400
–25 0
50 100 125
300
200
800
FREQUENCY (kHz)
R
FREQ
= 36k
R
FREQ
= 60k
R
FREQ
= 160k
TEMPERATURE (°C)
–50 –25
0
INTV
CC
VOLTAGE AT UVLO THRESHOLD (V)
2
5
0
50
75
3852 G24
1
4
3
25
100
125
INTV
CC
RAMPING UP
INTV
CC
RAMPING DOWN
INPUT VOLTAGE (V)
0 5 10 15 20 25 30 35
SHUTDOWN SUPPLY CURRENT (µA)
20
30
40
3852 G25
10
0
40
15
25
5
35
TEMPERATURE (°C)
–50
SHUTDOWN INPUT DC SUPPLY CURRENT (µA)
35
25
3852 G26
20
10
–25 0 50
5
0
40
30
25
15
75 100 125
TEMPERATURE (°C)
–50
INPUT DC SUPPLY CURRENT (mA)
2.0
2.5
3.0
25 75
3852 G27
1.5
1.0
–25 0
50 100 125
0.5
0
Maximum Current Sense
Threshold vs INTV
CC
Voltage
INTV
CC
VOLTAGE(V)
3.2 3.4 3.6
0
CURRENT SENSE THRESHOLD (mV)
10
30
40
50
4.4 4.6 4.8
90
3852 G28
20
3.8 4.0 4.2 5.0
60
70
80
Charge Pump Oscillator
Frequency vs Supply Voltage
SUPPLY VOLTAGE (V)
1.5
FREQUENCY (MHz)
1.50
1.25
1.00
0.75
0.50
0.25
0
2.0 2.5 3.0 3.5 4.0 4.5
3852 G29
Charge Pump Oscillator
Frequency vs Temperature
TEMPERATURE (oC)
–50
FREQUENCY (MHz)
1.4
1.3
1.2
1.1
1.0
0.9
0.8
–20 10 40 70 100 130
3852 G30
V
IN
= 4.5V
V
IN
= 2.4V
Charge Pump SHDN Threshold
Voltage vs Supply Voltage
THRESHOLD VOLTAGE (V)
0.7
0.8
0.6
0.5
0.9
SUPPLY VOLTAGE (V)
1.5
2.0 2.5 3.0 3.5 4.0 4.5
3852 G31
HIGH-TO-LOW THRESHOLD
LOW-TO-HIGH THRESHOLD