Datasheet

5
LTC3736-1
37361f
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
37361 G09
2
80
LOAD CURRENT (mA)
POWER LOST (W)
1
10
0.01
0.1
1 100 1000 10000
37361 G10
0.001
65
EFFICIENCY (%)
95
100
60
55
90
75
85
80
70
50
10
FIGURE 13 CIRCUIT
V
OUT
= 2.5V
V
IN
= 5V
V
IN
= 3.3V
V
IN
= 4.2V
V
IN
= 7.2V
Efficiency and Power Lost vs
Load Current
Shutdown (RUN) Threshold
vs Temperature
RUN/SS Pull-Up Current
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
37361 G12
0.2
0.8
0.9
0.6
–40 0
60
80
100
TEMPERATURE (°C)
–60
0.4
RUN/SS PULL-UP CURRENT (µA)
0.5
0.6
0.7
0.8
–20 20
60
100
37361 G13
0.9
1.0
–40 0
40
80
Oscillator Frequency
vs Temperature
TEMPERATURE (°C)
–60
–10
NORMALIZED FREQUENCY (%)
–8
–4
–2
0
10
4
–20
20
40
37361 G15
–6
6
8
2
–40 0
60
80
100
SSDIS = V
IN
TEMPERATURE (°C)
–60
INPUT (V
IN
) VOLTAGE (V)
2.30
2.40
100
37361 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
UW
T
A
= 25°C unless otherwise noted.
Maximum Current Sense Threshold
vs Temperature
TEMPERATURE (°C)
–60
115
MAXIMUM CURRENT SENSE THRESHOLD (mV)
120
125
130
135
–40 –20 0 20
37361 G14
40 60 80 100
I
PRG
= FLOAT
TEMPERATURE (°C)
–60
FEEDBACK VOLTAGE (V)
0.601
0.603
0.605
100
37361 G11
0.599
0.597
0.591
–20
20
60
–40
0
40
80
0.595
0.593
0.609
0.607
Regulated Feedback Voltage
vs Temperature
LOAD CURRENT (mA)
65
EFFICIENCY (%)
95
100
60
55
90
75
85
80
70
1 100 1000 10000
37361 G19
50
10
SPREAD SPECTRUM
CONSTANT 550kHz
FIGURE 13 CIRCUIT
V
OUT
= 2.5V
V
IN
= 5V
Efficiency vs Load Current