Datasheet

LTC3577/LTC3577-1
12
3577fa
TYPICAL PERFORMANCE CHARACTERISTICS
Switching from Suspend Mode to
5x Mode
WALL Connect Waveform WALL Disconnect Waveform
Oscillator Frequency
vs Temperature
Step-Down Switching Regulator 1
3.3V Output Effi ciency vs I
OUT1
Step-Down Switching Regulator 2
1.8V Output Effi ciency vs I
OUT2
T
A
= 25°C unless otherwise specifi ed
ILIM0
5V/DIV
V
OUT
5V/DIV
I
BUS
0.5A/DIV
I
BAT
0.5A/DIV
V
BAT
= 3.75V
I
OUT
= 100mA
R
CLPROG
= 2k
R
PROG
= 2k
ILIM1 = 5V
100µs/DIV
3577 G16
WALL
5V/DIV
V
OUT
5V/DIV
I
WALL
0.5A/DIV
I
BAT
0.5A/DIV
V
BAT
= 3.75V
I
OUT
= 100mA
R
PROG
= 2k
1ms/DIV
3577 G17
WALL
5V/DIV
V
OUT
5V/DIV
I
WALL
0.5A/DIV
I
BAT
0.5A/DIV
V
BAT
= 3.75V
I
OUT
= 100mA
R
PROG
= 2k
1ms/DIV
3577 G18
TEMPERATURE (°C)
–50
1.5
f
OSC
(MHz)
1.6
1.8
1.9
2.0
2.5
2.2
0
50
75
3577 G19
1.7
2.3
2.4
2.1
–25
25
100
125
V
IN
= 5V
V
IN
= 3.8V
V
IN
= 2.7V
V
IN
= 2.9V
I
OUT
(mA)
0.01
40
EFFICIENCY (%)
50
60
70
80
0.1 1 10 100 1000
3577 G20
30
20
10
0
90
100
V
IN12
= 3.8V
V
IN12
= 5V
Burst Mode
OPERATION
PULSE-SKIPPING MODE
V
OUT1
= 3.3V
I
OUT
(mA)
0.01
40
EFFICIENCY (%)
50
60
70
80
0.1 1 10 100 1000
3577 G21
30
20
10
0
90
100
V
IN12
= 3.8V
V
IN12
= 5V
Burst Mode
OPERATION
V
OUT2
= 1.8V
PULSE-SKIPPING MODE
Input Connect Waveform Input Disconnect Waveform Switching from 1x to 5x Mode
V
BUS
5V/DIV
V
OUT
5V/DIV
I
BUS
0.5A/DIV
I
BAT
0.5A/DIV
V
BAT
= 3.75V
I
OUT
= 100mA
R
CLPROG
= 2k
R
PROG
= 2k
1ms/DIV
3577 G13
V
BUS
5V/DIV
V
OUT
5V/DIV
I
BUS
0.5A/DIV
I
BAT
0.5A/DIV
V
BAT
= 3.75V
I
OUT
= 100mA
R
CLPROG
= 2k
R
PROG
= 2k
1ms/DIV
3577 G14
ILIM0/ILIM1
5V/DIV
I
BUS
0.5A/DIV
I
BAT
0.5A/DIV
V
BAT
= 3.75V
I
OUT
= 50mA
R
CLPROG
= 2k
R
PROG
= 2k
1ms/DIV
3577 G15