Datasheet

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