ltc3240-3.3 Linear Technology Corporation, ltc3240-3.3 Datasheet - Page 4

• Manufacturer Part Number: ltc3240-3.3
• Description: 3.3v/2.5v Step-up/ Step-down Charge Pump Dc/dc Converter
• Manufacturer: Linear Technology Corporation

LTC3240-3.3/LTC3240-2.5
TYPICAL PERFOR A CE CHARACTERISTICS
unless otherwise noted)
4
3.80
3.75
3.70
3.65
3.60
3.55
3.50
3.45
3.40
10
9
7
6
5
8
–40
0
Mode Switch Threshold
vs Load Current (LTC3240-3.3)
Effective Open-Loop Resistance
vs Temperature (LTC3240-3.3)
V
V
IN
OUT
20
= 1.8V
= 3V
–15
DOUBLER MODE
40
(V
DOUBLER TO
(V
LDO MODE
IN
TEMPERATURE (°C)
IN
2V/DIV
2V/DIV
LDO TO
SHDN
FALLING)
V
RISING)
60
OUT
10
I
LOAD
80
V
V
R
IN
LOAD
(mA)
OUT
= 2.4V
35
100
= 66Ω
Soft-Start (LTC3240-3.3)
120
W
60
140
3240 G10
200µs/DIV
3240 G07
U
160
85
2.95
2.85
2.80
2.70
2.65
2.90
2.75
100
90
80
70
60
50
40
30
20
10
0
1.7
0
No-Load Input Current
vs Supply Voltage (LTC3240-3.3)
Mode Switch Threshold
vs Load Current (LTC3240-2.5)
3240 G13
2.2
MODE (V
20
LDO TO DOUBLER
2.7
40
SUPPLY VOLTAGE (V)
IN
3.2
60
FALLING)
I
LOAD
MODE (V
DOUBLER TO LDO
3.7
80
(mA)
AC COUPLED
100
4.2
IN
20mV/DIV
RISING)
120
4.7
V
OUT
5.2
140
Output Noise/Ripple
(LTC3240-3.3)
V
I
3240 G08
3240 G11
LOAD
(T
IN
A
= 2.4V
160
5.7
= 25°C, C
= 100mA
100
100
90
80
70
60
50
40
30
20
500ns/DIV
FLY
10
60
90
80
70
50
40
30
20
10
0
0
1.80
1.7
No-Load Input Current
vs Supply Voltage (LTC3240-2.5)
Effi ciency vs Supply Voltage
(LTC3240-3.3)
= C
2.30
2.2
IN
= 1µF, C
2.80
2.7
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
3.30
3.2
3240 G14
OUT
3.80 4.30
3.7
= 4.7µF
DOUBLER TO LDO
MODE (V
LDO TO DOUBLER
MODE (V
I
LOAD
4.2
= 1mA
I
LOAD
4.80 5.30 5.80
4.7
IN
IN
RISING)
FALLING)
= 40mA
5.2
3240 G09
3240 G12
3240fb
5.7