LTC3864 Datasheet, PDF (7/28 Pages) Linear Technology – 60V Low IQ Step-Down DC/DC Controller with 100% Duty Cycle Capability

LTC3864
TYPICAL PERFORMANCE CHARACTERISTICS T_A = 25°C, unless otherwise noted.
Free Running Frequency Over
Input Voltage
600
550
FREQ = OPEN
500
450
400
FREQ = 0V
350
300
0
10 20 30 40 50 60
V_IN (V)
3864 G19
GATE Bias LDO (V_IN - V_CAP) Load
Regulation
0.5
0.0
–0.5
–1.0
–1.5
–2.0
–2.5
–3.0
–3.5
0
5
10
15
20
I_GATE (mA)
3864 G22
Current Sense Voltage Over
Temperature
100
Free Running Frequency Over
Temperature
600
550
FREQ = OPEN
500
450
400
FREQ = 0V
350
300
–75
–25
25
75 125 175
TEMPERATURE (°C)
3864 G20
GATE Bias LDO (V_IN - V_CAP)
Dropout Behavior
0.1
V_IN = 5V
0.0
–0.1
–0.2
–0.3
–0.4
–0.5
0
5
10
15
20
I_GATE (mA)
3864 G23
SS Pin Pull-Up Current Over
Temperature
14
Frequency Foldback % Over
Feedback Voltage
120
100
80
60
40
20
0
0
200
400
600
800
V_FB (mV)
3864 G21
Current Sense Voltage Over ITH
Voltage
100
Burst Mode OPERATION
90
PULSE-SKIPPING
80
70
60
50
40
30
20
10
0
–10
0
0.4 0.8
1.2
1.6
2
ITH VOLTAGE (V)
3864 G24
RUN Pin Pull-Up Current Over
Temperature
0.65
98
96
94
92
90
–75
–25 25
75 125 175
TEMPERATURE (°C)
3864 G25
12
0.55
10
0.45
8
0.35
6
–75 –25 25
75 125 175
TEMPERATURE (°C)
3864 G26
0.25
–75
–25 25
75 125 175
TEMPERATURE (°C)
3864 G27
3864f
7