Datasheet

6
LTC1735
1735fc
TYPICAL PERFOR A CE CHARACTERISTICS
UW
Oscillator Frequency
vs Temperature
TEMPERATURE (°C)
–40 –15
250
FREQUENCY (kHz)
270
300
10
60
85
1735 G19
260
290
280
35
110
135
C
OSC
= 47pF
RUN/SS Pin Current
vs Temperature
TEMPERATURE (°C)
–40 –15
–5
RUN/SS CURRENT (µA)
–3
0
10
60
85
1735 G20
–4
–1
–2
35
110
135
V
RUN/SS
= 0V
TEMPERATURE (°C)
–40 –15
–1.0
FCB CURRENT (µA)
–0.6
0
10
60
85
1735 G21
–0.8
–0.2
–0.4
35
110
135
V
FCB
= 0.85V
FCB Pin Current vs Temperature
Output Current vs Duty Cycle
SENSE Pins Total Source Current I
TH
Voltage vs Load Current
DUTY CYCLE (%)
0
0
AVERAGE OUTPUT CURRENT I
OUT
/I
MAX
(%)
20
40
60
80
100
20
40 60 80
1735 G14
100
f
SYNC
= f
O
I
OUT
/I
MAX
(SYNC)
I
OUT
/I
MAX
(FREE RUN)
V
SENSE
COMMON MODE VOLTAGE (V)
0
I
SENSE
(µA)
0
1735 G16
–50
–100
24
50
100
6
LOAD CURRENT (A)
0
0
I
TH
VOLTAGE (V)
0.5
1.0
1.5
2.0
2.5
1
234
1735 G17
56
V
IN
= 10V
V
OUT
= 3.3V
R
SENSE
= 0.01Ω
f
O
= 300kHz
CONTINUOUS
MODE
Burst Mode
OPERATION
SYNCHRONIZED f = f
O
Supply Current in Shutdown
vs V
RUN/SS
V
RUN/SS
0
0
SUPPLY CURRENT (µA)
10
30
40
50
100
70
0.5
1
1735 G28
20
80
90
60
1.5
2
TEMPERATURE (°C)
–50
0
SUPPLY CURRENT (µA)
5
10
15
20
25
30
0 50 100 150
1735 G29
Supply Current in Shutdown
vs Temperature