Datasheet

LTC3203/LTC3203-1
LTC3203B/LTC3203B-1
5
32031fa
TYPICAL PERFOR A CE CHARACTERISTICS
UW
V
FB
Set Point vs Supply Voltage
(LTC3203/LTC3203B)
No-Load Input Current vs Supply
Voltage (LTC3203/LTC3203-1)
Extra Input Current vs Load
Current (LTC3203/LTC3203-1)
V
IN
(V)
2.5
I
IN
(µA)
60
80
100
4
5
3203 G10
40
20
0
3 3.5 4.5
120
140
160
5.5
2x MODE
1.5x MODE
Burst Mode Current Threshold
vs Supply Voltage
(LTC3203/LTC3203-1)
V
IN
(V)
2.5
0
I
LOAD
(mA)
100
200
300
3
3.5
4 4.5
3203 G11
5
400
500
50
150
250
350
450
5.5
2x MODE
1.5x MODE
I
LOAD
(mA)
0.01
0.01
EXTRA I
IN
(mA)
1
0.1 1 10 100 1000
3209 G12
0.1
10
100
2x MODE
I
IN
– 2 • I
LOAD
1.5x MODE
I
IN
– 1.5 • I
LOAD
Input and Output Ripple
(2x Mode)
Load Transient (1.5x Mode)
Input and Output Ripple
(1.5x Mode)
V
FB
vs Load Current
(LTC3203/LTC3202B)Load Transient (2x Mode)
V
IN
20mV/DIV
AC-COUPLED
V
OUT
20mV/DIV
AC-COUPLED
V
IN
= 4V
C
IN
= 2.2µF
C
OUT
= 10µF
I
OUT
= 300mA
1.5x MODE
500ns/DIV
3203 G13
V
IN
20mV/DIV
AC-COUPLED
V
OUT
20mV/DIV
AC-COUPLED
V
IN
= 3.6V
C
IN
= 2.2µF
C
OUT
= 10µF
I
OUT
= 300mA
2x MODE
500ns/DIV
3203 G14
V
OUT
100mV/DIV
AC-COUPLED
500mA
I
OUT
100mA
V
IN
= 4V
C
IN
= 2.2µF
C
OUT
= 10µF
1.5x MODE
20µs/DIV
3203 G15
V
OUT
100mV/DIV
AC-COUPLED
500mA
I
OUT
100mA
V
IN
= 3.6V
C
IN
= 2.2µF
C
OUT
= 10µF
2x MODE
20µs/DIV
3203 G16
V
IN
(V)
2.5
0.88
V
FB
(V)
0.89
0.90
0.91
0.92
0.94
3
3.5 4 4.5
3203 G17
5 5.5
0.93
T
A
= 25°CT
A
= –40°C
T
A
= 85°C
I
LOAD
(mA)
0
0.82
V
FB
(V)
0.84
0.88
0.90
0.92
0.96
50
250
350
3203 G18
0.86
0.94
200
450
500
100
150
300 400
V
IN
= 4V
1.5x MODE
V
IN
= 3.6V
2x MODE