Datasheet
LTC3240-3.3/LTC3240-2.5
3
3240fb
Oscillator Frequency vs Supply
Voltage (Doubler Mode)
⎯
S
⎯
H
⎯
D
⎯
N Threshold Voltage
vs Supply Voltage
Short-Circuit Current
vs Supply Voltage
Start-Up Time vs Supply Voltage Load Regulation (LTC3240-3.3)
Load Regulation (LTC3240-2.5)
TYPICAL PERFOR A CE CHARACTERISTICS
UW
(T
A
= 25°C, C
FLY
= C
IN
= 1µF, C
OUT
= 4.7µF
unless otherwise noted)
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: The LTC3240-3.3/LTC3240-2.5 are guaranteed to meet
performance specifi cations from 0°C to 85°C. Specifi cations over the
–40°C to 85°C operating temperature range are assured by design,
characterization and correlation with statistical process controls.
Note 3: R
OL
≡ (2V
IN
– V
OUT
)/I
OUT
Note 4: Failure to solder the exposed backside of the package to a PCB
ground plane will result in a thermal resistance much higher than 80°C/W.
The ● denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C,
⎯
S
⎯
H
⎯
D
⎯
N = V
IN
, C
FLY
= 1µF, C
IN
= 1µF, C
OUT
= 4.7µF unless otherwise noted.
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
R
OL
Effective Open-Loop
Output Resistance Doubler Mode
LTC3240-3.3 V
IN
= 1.8V, V
OUT
= 3V 7.5 Ω
LTC3240-2.5 V
IN
= 1.8V, V
OUT
= 2.25V 8.0 Ω
(Note 3)
SUPPLY VOLTAGE (V)
1.7
SHORT-CIRCUIT CURRENT (mA)
400
500
600
4.7
3240 G03
300
200
2.7 3.7
2.2 5.2
3.2 4.2 5.7
100
0
700
V
IN
(V)
400
START-UP TIME (µs)
600
800
1000
500
700
900
2 2.4 2.8 3.2
3240 G04
3.61.81.6 2.2 2.6 3 3.4
I
LOAD
= 50mA
SUPPLY VOLTAGE (V)
1.8
0.6
OSCILLATOR FREQUENCY (MHz)
0.8
1.0
1.2
1.4
1.6
1.8
2.2 2.6 3.0 3.4
3240 G01
3.8
–40°C
85°C
25°C
SUPPLY VOLTAGE (V)
1.80
SHUTDOWN VOLTAGE (V)
0.6
0.8
1.0
3.30 4.30 5.80
3240 G02
0.4
0.2
0
2.30 2.80
3.80
4.80 5.30
–40°C
SHUTDOWN
HYSTERESIS
85°C
25°C
LOAD CURRENT (mA)
0
OUTPUT VOLTAGE (V)
3.30
3.35
120
3240 G05
3.25
3.20
30
60
90
150
3.40
V
IN
= 3.7V
V
IN
= 2.5V
V
IN
= 1.8V
LOAD CURRENT (mA)
0
OUTPUT VOLTAGE (V)
2.50
2.55
120
3240 G06
2.45
2.40
30
60
90
150
2.60
V
IN
= 2.4V
V
IN
= 2.8V
V
IN
= 1.8V