LTC3838-1_15 Datasheet, PDF (9/52 Pages) Linear Technology – Dual, Fast, Accurate Step-Down DC/DC Controller with Dual Differential Output Sensing

TYPICAL PERFORMANCE CHARACTERISTICS
LTC3838-1
Current Sense Voltage
vs ITH Voltage
120
FORCED CONTINUOUS MODE
100
80
60
40
20
0
–20
–40
–60
0
V_RNG = INTV_CC
V_RNG = SGND
0.4 0.8 1.2 1.6 2 2.4
ITH VOLTAGE (V)
38381 G28
RUN Pin Thresholds
vs Temperature
1.6
1.4
SWITCHING REGION
1.2
1.0
STAND-BY REGION
0.8
0.6
SHUTDOWN REGION
0.4
0.2
0
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
38381 G30
INTV_CC Undervoltage Lockout
Thresholds vs Temperature
4.5
UVLO RELEASE
4.3
(INTV_CC RISING)
4.1
3.9
3.7
UVLO LOCK
(INTV_CC FALLING)
3.5
3.3
–50 –25 0 25 50 75 100 125 150
TEMPERATURE (°C)
38381 G33
Maximum Current Sense Voltage
vs Temperature
120
100
80
60
V_RNG = INTV_CC
40
V_RNG = SGND
20
0
–50 –25 0 25 50 75 100 125 150
TEMPERATURE (°C)
38381 G29
RUN Pull-Up Currents
vs Temperature
8
7
6
RUN PIN ABOVE 1.2V
SWITCHING THRESHOLD
5
4
3
RUN PIN BELOW 1.2V
2
SWITCHING THRESHOLD
1
0
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
38381 G31
Shutdown Current Into V_IN Pin
vs Voltage on V_IN Pin
40
35
30
25
20
15
10
130°C
5
25°C
–45°C
0
0 5 10 15 20 25 30 35 40
V_IN (V)
38381 G34
For more information www.linear.com3838-1
Maximum Current Sense Voltage
vs Voltage on SENSE^– Pin
120
100
80
V_RNG = INTV_CC
60
40
V_RNG = SGND
20
0
–0.5
0.5 1.5 2.5 3.5 4.5 5.5
SENSE^– PIN VOLTAGE (V)
38381 G22
TRACK/SS Pull-Up Currents
vs Temperature
1.20
1.15
1.10
1.05
1.00
0.95
0.90
0.85
0.80
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
38381 G32
Quiescent Current Into V_IN Pin
vs Temperature
3.5
3.0
BOTH CHANNELS ON
2.5
CHANNEL 1 ON ONLY OR
CHANNEL 2 ON ONLY
2.0
1.5
1.0
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
38381 G35
38381f
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