LTC3826-1 Datasheet, PDF (5/32 Pages) Linear Technology – 30μA IQ, Dual, 2-Phase Synchronous Step-Down Controller

TYPICAL PERFORMANCE CHARACTERISTICS
Inductor Current at Light Load
FORCED
CONTINUOUS
MODE
2A/DIV
Burst Mode
OPERATION
PULSE
SKIPPING
MODE
2μs/DIV
FIGURE 13 CIRCUIT
V_OUT = 3.3V
I_LOAD = 100μA
38261 G07
Soft Start-Up
V_OUT2
2V/DIV
V_OUT1
2V/DIV
20ms/DIV
FIGURE 13 CIRCUIT
38261 G08
LTC3826-1
Tracking Start-Up
V_OUT2
2V/DIV
V_OUT1
2V/DIV
20ms/DIV
FIGURE 13 CIRCUIT
38261 G09
Total Input Supply Current
vs Input Voltage
350
300
250
200
150
300μA LOAD
100
50
NO LOAD
0
5 10 15 20 25
INPUT VOLTAGE (V)
FIGURE 13 CIRCUIT
30 35
38261 G10
Maximum Current Sense Voltage
vs I_TH Voltage
100
PULSE SKIPPING
FORCED CONTINUOUS
80
Burst Mode OPERATION
(RISING)
60
Burst Mode OPERATION
(FALLING)
40
20
0
–20
10% DUTY CYCLE
–40
0 0.2 0.4 0.6 0.8 1.0 1.2 1.4
I_TH PIN VOLTAGE (V)
38261 G13
EXTV_CC Switchover and INTV_CC
Voltages vs Temperature
6.0
5.8
5.6
5.4
INTV_CC
5.2
5.0
4.8
EXTV_CC RISING
4.6
4.4
EXTV_CC FALLING
4.2
4.0
–45 –25 –5 15 35 55 75 95
TEMPERATURE (°C)
38261 G11
Sense Pins Total Input
Bias Current
60
30
0
–30
–60
–90
–120
–150
–180
–210
–240
–270
–300
0 1 2 3 4 5 6 7 8 9 10
V_SENSE COMMON MODE VOLTAGE (V)
38261 G14
INTV_CC Line Regulation
5.5
5.4
5.3
5.2
5.1
5.0
0 5 10 15 20 25 30 35 40
INPUT VOLTAGE (V)
38261 G12
Maximum Current Sense
Threshold vs Duty Cycle
120
100
80
60
40
20
0
0 10 20 30 40 50 60 70 80 90 100
DUTY CYCLE (%)
38261 G15
38261fb
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