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LTC3240EDC-3.3#TRMPBF

P1-P3P4-P6P7-P9P10-P12
LTC3240-3.3/LTC3240-2.5
1
3240fb
■
Step-Up/Step-Down Charge Pumps Generate Fixed
3.3V or 2.5V Outputs
■
V
IN
Range: 1.8V to 5.5V
■
Output Current up to 150mA
■
Automatic Mode Switching
■
Constant Frequency (1.2MHz) Operation in
Step-Up Mode
■
Low Dropout Regulator Operation in
Step-Down Mode
■
Low No-Load Quiescent Current: I
Q
= 65µA
■
Built-In Soft-Start Reduces Inrush Current
■
Shutdown Disconnects Load from Input
■
Shutdown Current < 1µA
■
Short-Circuit/Thermal Protection
■
Available in a 6-Lead (2mm × 2mm) DFN Package
3.3V/2.5V Step-Up/
Step-Down Charge Pump
DC/DC Converter
The LTC
®
3240-3.3/LTC3240-2.5 are step-up/step-down
charge pump DC/DC converters that produce a fi xed
regulated output voltage of 3.3V or 2.5V over a wide input
voltage range (1.8V to 5.5V).
With input voltages greater than the regulated output
voltage the LTC3240 operates as a low dropout regulator.
Once the input voltage drops within 100mV of the regulated
output voltage the part automatically switches to step-up
mode. In step-up mode the LTC3240 operates as a constant
frequency (1.2MHz) doubling charge pump.
The LTC3240-3.3/LTC3240-2.5 feature low no load operat-
ing current (65µA typical) and ultralow operating current
in shutdown (<1µA). Built-in soft-start circuitry prevents
excessive inrush current during start-up. Thermal shut-
down and current-limit circuitry allow the parts to survive
a continuous short-circuit from V
OUT
to GND.
The LTC3240-3.3/LTC3240-2.5 require only three tiny
external ceramic capacitors for an ultrasmall application
footprint. The LTC3240-3.3/LTC3240-2.5 are available in a
6-pin (2mm × 2mm) DFN package.
■
2 AA to 2.5V
■
2-3 AA/Li-Ion to 3.3V
■
Low Power Supplies for Cameras, I/O Supplies,
Audio, PC Cards, Misc. Logic, etc., in a Wide Variety
of Handheld Products
Output Voltage vs Input Voltage (Full Range)
APPLICATIO S
U
FEATURES
DESCRIPTIO
U
TYPICAL APPLICATIO
U
OFF ON
V
IN
GND
SHDN
V
OUT
C
–
C
+
LTC3240-3.3
1µF
4.7µF
1µF
3.3V
I
OUT
= 150mA
2.7V TO 4.5V
3240 TA01a
Li-Ion OR
3-CELL NiMH
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Protected by U.S. Patents including 6411531.
Li-Ion to 3.3V at Up to 150mA
INPUT VOLTAGE (V)
1.7
OUTPUT VOLTAGE (V)
3.30
3.40
5.7
3240 TA01b
3.20
3.10
2.7
3.7
4.7
2.2
3.2
4.2
5.2
3.50
3.25
3.35
3.15
3.45
I
OUT
= 30mA
LTC3240-3.3/LTC3240-2.5
2
3240fb
V
IN
to GND ...................................................–0.3V to 6V
V
OUT
to GND .............................................–0.3V to 5.5V
⎯
S
⎯
H
⎯
D
⎯
N to GND ................................ –0.3V to (V
IN
+ 0.3V)
V
OUT
Short-Circuit Duration ............................. Indefi nite
Operating Temperature Range (Note 2) ...–40°C to 85°C
Storage Temperature Range ...................–65°C to 125°C
Maximum Junction Temperature .......................... 125°C
ORDER PART NUMBER
T
JMAX
= 125°C, θ
JA
= 80°C/W (NOTE 4)
EXPOSED PAD (PIN 7) IS GND, MUST BE SOLDERED TO PCB
LTC3240EDC-3.3
LTC3240EDC-2.5
(Note 1)
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
ABSOLUTE AXI U RATI GS
W
WW
U
PACKAGE/ORDER I FOR ATIO
UUW
TOP
VIEW
DC PACKAGE
6-LEAD (2mm × 2mm) PLASTIC DFN
4
57
6
3
2
1GND
V
IN
V
OUT
SHDN
C
–
C
+
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
IN
Input Voltage Range ● 1.8 5.5 V
V
OUT
Output Voltage Range 1.8V ≤ V
IN
≤ 2.5V, I
OUT
< 40mA ● 3.168 3.3 3.432 V
LTC3240-3.3 2.5V ≤ V
IN
≤ 5.5V, I
OUT
< 150mA ● 3.168 3.3 3.432 V
LTC3240-2.5 1.8V ≤ V
IN
≤ 5.5V, I
OUT
< 60mA ● 2.4 2.5 2.6 V
I
IN
No Load Input Current I
OUT
= 0, 1.8V ≤ V
IN
≤ 5.5V 65 100 µA
I
⎯
S
⎯
H
⎯
D
⎯
N
Shutdown Current
⎯
S
⎯
H
⎯
D
⎯
N = 0V, V
OUT
= 0V 0.1 1 µA
η Effi ciency V
IN
= 2.5V, I
OUT
= 100mA 64 %
LTC3240-3.3 V
IN
= 3.7V, I
OUT
= 100mA 87 %
LTC3240-2.5 V
IN
= 2V, I
OUT
= 50mA 63 %
V
IN
= 3V, I
OUT
= 50mA 83 %
V
IH
⎯
S
⎯
H
⎯
D
⎯
N Input High Voltage 1.8V ≤ V
IN
≤ 5.5V ● 1.2 V
V
IL
⎯
S
⎯
H
⎯
D
⎯
N Input Low Voltage 1.8V ≤ V
IN
≤ 5.5V ● 0.4 V
I
IH
⎯
S
⎯
H
⎯
D
⎯
N Input Current V
⎯
S
⎯
H
⎯
D
⎯
N
= V
IN
= 5.5V ● –1 1 µA
I
IL
⎯
S
⎯
H
⎯
D
⎯
N Input Current V
⎯
S
⎯
H
⎯
D
⎯
N
= 0V ● –1 1 µA
I
LIM
Output Current Limit V
IN
= 3.7V, V
OUT
= 0V Step-Down Mode 450 mA
V
IN
= 2.4V, V
OUT
= 0V Step-Up Mode 270 mA
t
ON
V
OUT
Turn-On Time From the Rising Edge of
⎯
S
⎯
H
⎯
D
⎯
N to 90% of V
OUT
V
IN
= 2.5V, R
LOAD
= 66Ω 0.5 ms
V
IN
= 3.7V, R
LOAD
= 66Ω 0.4 ms
Step-Up Mode
I
BURST
Burst Mode Threshold V
IN
= 2.4V 15 mA
V
RIPPLE
Output Ripple I
OUT
= 100mA, V
OUT
= 2.5V or 3.3V 20 mV
P-P
f
OSC
Switching Frequency V
IN
= 2.4V ● 0.6 1.2 1.8 MHz
V
RIPPLE(BURST)
Burst Mode
®
Output Ripple V
IN
= 2.4V 20 mV
P-P
Burst Mode is a registered trademark of Linear Technology Corporation.
DC PART MARKING
Order Options Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking: http://www.linear.com/leadfree/
LBXJ
LCBP
Consult LTC Marketing for parts specifi ed with wider operating temperature ranges.
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
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LTC3240EDC-3.3#TRMPBF

Mfr. #:
Buy LTC3240EDC-3.3#TRMPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators 3.3V Step-Up/Step-Down Charge Pump DC/DC Converter
Lifecycle:
New from this manufacturer.
Delivery:
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