LTC3829_15 Datasheet, PDF (6/40 Pages) Linear Technology – 3-Phase, Single Output Synchronous Step-Down DC/DC Controller with Diffamp

LTC3829
TYPICAL PERFORMANCE CHARACTERISTICS
Phase Shedding Transition
Phase Shedding Transition
V_SW1
10V/DIV
V_SW2
10V/DIV
V_SW3
10V/DIV
V_OUT
50mV/DIV
AC-COUPLED
V_IN = 12V
4µs/DIV
V_OUT = 1.5V
TRANSITION LOAD CURRENT = 18.6A
3829 G03
Prebiased Output at 2V
V_SW1
10V/DIV
V_SW2
10V/DIV
V_SW3
10V/DIV
V_OUT
50mV/DIV
AC-COUPLED
V_IN = 12V
4µs/DIV
VOUT = 1.5V
TRANSITION LOAD CURRENT = 5.3A
3829 G04
Coincident Tracking
V_OUT
1V/DIV
V_FB
500mV/DIV
TK/SS
500mV/DIV
V_IN = 12V
V_OUT = 3.3V
2ms/DIV
3829 G05
RUN
2V/DIV
V_OUT1 = 3.3V
V_OUT2 = 1.5V
1V/DIV
V_OUT1
V_OUT2
V_IN = 12V
NO LOAD
2ms/DIV
3829 G06
Quiescent Current vs Input
Voltage without EXTV_CC
5.5
5.3
5.1
4.9
4.7
4.5
4.3
4.1
3.9
3.7
3.5
4
14
24
INPUT VOLTAGE (V)
34 40
3829 G08
INTV_CC Line Regulation
5.25
5.00
4.75
4.50
4.25
4.00
3.75
3.50
3.25
3.00
2.75
2.50
2.25
2.00
0 5 10 15 20 25 30
INPUT VOLTAGE (V)
35 40
3829 G09
Current Sense Threshold
vs I_TH Voltage
80
I_LIM = INTV_CC
60
I_LIM = FLOAT
40
20
I_LIM = GND
0
–20
–40
0
0.5
1
1.5
2
V_ITH (V)
3829 G10
3829fc
6
For more information www.linear.com/LTC3829