Datasheet

LTC3736-2
5
37362fb
TYPICAL PERFORMANCE CHARACTERISTICS
Effi ciency 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
Oscillator Frequency
vs Temperature
Tracking Start-Up with External
Soft-Start (C
SS
= 0.10μF)
Oscillator Frequency
vs Input Voltage
Maximum Current Sense Voltage
vs I
TH
Pin Voltage
T
A
= 25°C, unless otherwise noted.
V
IN
= 5V
R
LOAD1
= R
LOAD2
= 1Ω
FIGURE 15 CIRCUIT
40ms/DIV
37362 G07
500mV/
DIV
V
OUT1
2.5V
V
OUT2
1.8V
INPUT VOLTAGE (V)
2
–5
NORMALIZED FREQUENCY SHIFT (%)
–4
–2
–1
0
5
2
4
6
7
37368 G08
–3
3
4
1
35
8
9
10
I
TH
VOLTAGE (V)
0.5
–20
CURRENT LIMIT (%)
0
20
40
60
100
1 1.5
37362 G09
2
80
FORCED CONTINUOUS
MODE
PULSE-SKIPPING
MODE
LOAD CURRENT (mA)
65
EFFICIENCY (%)
95
100
60
55
90
75
85
80
70
1 100 1000 10000
37362 G10
50
10
FIGURE 15 CIRCUIT
V
IN
= 3.3V
V
OUT
= 2.5V
PULSE-SKIPPING
MODE
(SYNC/FCB = V
IN
)
FORCED
CONTINUOUS
(SYNC/FCB = 0V)
TEMPERATURE (°C)
–60
FEEDBACK VOLTAGE (V)
0.600
0.603
0.604
100
37362 G11
0.599
0.598
0.594
–20
20
60
–40
0
40
80
0.596
0.606
0.605
0.602
0.601
0.597
0.595
TEMPERATURE (°C)
–60
0
RUN/SS VOLTAGE (V)
0.1
0.3
0.4
0.5
1.0
0.7
–20
20
40
37362 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
37362 G13
0.9
1.0
–40 0
40
80
TEMPERATURE (°C)
–60
150
MAXIMUM CURRENT SENSE THRESHOLD (mV)
155
160
165
170
–20 20
60
100
37362 G14
175
180
–40 0
40
80
I
PRG
= GND
TEMPERATURE (°C)
–60
–10
NROMALIZED FREQUENCY (%)
–8
–4
–2
0
10
4
–20
20
40
37362 G15
–6
6
8
2
–40 0
60
80
100