5
LTC3736
3736fa
Maximum Current Sense Voltage
vs I
TH
Pin Voltage
I
TH
VOLTAGE (V)
0.5
–20
CURRENT LIMIT (%)
0
20
40
60
100
1
1.5
3736 G09
2
80
Burst Mode OPERATION
(I
TH
RISING)
Burst Mode OPERATION
(I
TH
FALLING)
FORCED CONTINUOUS
MODE
PULSE SKIPPING
MODE
LOAD CURRENT (mA)
65
EFFICIENCY (%)
95
100
60
55
90
75
85
80
70
1
100
1000
10000
3736 G10
50
10
PULSE SKIPPING
MODE
(SYNC/FCB = 550kHz)
FIGURE 15 CIRCUIT
V
IN
= 5V
V
OUT
= 2.5V
Burst Mode
OPERATION
(SYNC/FCB = V
IN
)
FORCED
CONTINUOUS
(SYNC/FCB = 0V)
TEMPERATURE (
°
C)
–60
FEEDBACK VOLTAGE (V)
0.601
0.603
0.605
100
3736 G11
0.599
0.597
0.591
–20
20
60
–40
0
40
80
0.595
0.593
0.609
0.607
Efficiency vs Load Current
Regulated Feedback Voltage
vs Temperature
Shutdown (RUN) Threshold
vs Temperature
RUN/SS Pull-Up Current
vs Temperature
Maximum Current Sense Threshold
vs Temperature
TEMPERATURE (
°
C)
–60
0
RUN/SS VOLTAGE (V)
0.1
0.3
0.4
0.5
1.0
0.7
–20
20
40
3736 G12
0.2
0.8
0.9
0.6
–40
0
60
80
100
TEMPERATURE (
°
C)
–60
0.4
RUN/SS PULL-UP CURRENT (
µ
A)
0.5
0.6
0.7
0.8
–20
20
60
100
3736 G13
0.9
1.0
–40
0
40
80
TEMPERATURE (
°
C)
–60
115
MAXIMUM CURRENT SENSE THRESHOLD (mV)
120
125
130
135
–40 –20
0
20
3736 G14
40
60
80
100
I
PRG
= FLOAT
Oscillator Frequency
vs Temperature
TEMPERATURE (
°
C)
–60
–10
NROMALIZED FREQUENCY (%)
–8
–4
–2
0
10
4
–20
20
40
3736 G15
–6
6
8
2
–40
0
60
80
100
TEMPERATURE (
°
C)
–60
INPUT (V
IN
) VOLTAGE (V) 2.30
2.40
100
3736 G16
2.20
2.10
–20
20
60
–40
0
40
80
2.50
2.25
2.35
2.15
2.45
V
IN
RISING
V
IN
FALLING
Undervoltage Lockout Threshold
vs Temperature
TYPICAL PERFOR A CE CHARACTERISTICS
U
W
T
A
= 25
°
C unless otherwise noted.
