LTC3836 LINER [Linear Technology], LTC3836 Datasheet - Page 4

• Manufacturer Part Number: LTC3836
• Description: Dual 2-Phase, No RSENSETM Low VIN Synchronous Controller
• Manufacturer: LINER [Linear Technology]

LTC3836
TYPICAL PERFORMANCE CHARACTERISTICS
4
AC COUPLED
500mV/DIV
INDUCTOR
20mV/DIV
CURRENT
2V/DIV
5A/DIV
100
V
V
90
80
70
60
50
40
30
20
OUT
SW
1
Light Load
(Pulse-Skipping Mode)
Effi ciency vs Load Current
Tracking Start-Up with External
Soft-Start (C
V
V
CIRCUIT OF FIGURE 15
V
V
I
CIRCUIT OF FIGURE 15
V
R
CIRCUIT OF FIGURE 15
LOAD
IN
OUT
IN
OUT
IN
LOAD1
PULSE-SKIPPING
= 3.3V
= 3.6V
= 3.6V
= 1.5V
= 1.8V
= 300mA
MODE
= R
10
LOAD2
LOAD CURRENT (mA)
RUN/SS
2.50ms/DIV
= 1Ω
2μs/DIV
CONTINUOUS
100
FORCED
MODE
= 0.01μF)
SYNC/FCB = V
SYNC/FCB = 0V
1000
V
1.2V
V
1.8V
3836 G01
OUT2
3836 G04
OUT1
3836 G07
IN
10000
AC COUPLED
AC COUPLED
100mV/DIV
INDUCTOR
INDUCTOR
20mV/DIV
500mV/DIV
CURRENT
CURRENT
5A/DIV
5A/DIV
2V/DIV
V
V
V
OUT
OUT
SW
Load Step
(Forced Continuous Mode)
Light Load
(Forced Continuous Mode)
Sequential Start-Up
V
V
CONTINUOUS MODE: 400mA TO 4A
CIRCUIT OF FIGURE 15
V
V
I
CIRCUIT OF FIGURE 15
V
R
V
V
CIRCUIT OF FIGURE 15
LOAD
IN
OUT
IN
OUT
IN
OUT1
OUT2
LOAD1
= 3.6V
= 3.6V
= 3.3V
= 1.8V
= 1.8V
= 300mA
: INTERNAL SOFT-START
: C
= R
TRACK/SS
LOAD2
100μs/DIV
= 1Ω
= 0.047μF
4ms/DIV
2μs/DIV
T
A
V
1.2V
V
1.8V
3836 G02
OUT2
3836 G10
OUT1
3836 G05
= 25°C unless otherwise noted.
AC COUPLED
100mV/DIV
INDUCTOR
500mV/DIV
CURRENT
5A/DIV
V
OUT
–5
–1
–2
–3
–4
5
4
3
2
1
0
2.5
Load Step
(Pulse-Skipping Mode)
Tracking Start-Up with Internal
Soft-Start (C
Oscillator Frequency
vs Input Voltage
V
V
PULSE-SKIPPING MODE: 400MA TO 4A
CIRCUIT OF FIGURE 15
V
R
CIRCUIT OF FIGURE 15
IN
OUT
IN
LOAD1
= 3.6V
= 3.6V
= 1.8V
= R
3.0
LOAD2
INPUT VOLTAGE (V)
RUN/SS
100μs/DIV
250μs/DIV
= 1Ω
3.5
= 0μF)
4.0
V
1.2V
V
1.8V
3836 G08
3836 G03
OUT2
3836 G06
OUT1
3836fa
4.5