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LTC3240-3.3 数据表(PDF) 1 Page - Linear Technology

部件名 LTC3240-3.3
功能描述  3.3V/2.5V Step-Up/ Step-Down Charge Pump DC/DC Converter
Download  12 Pages
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制造商  LINER [Linear Technology]
网页  http://www.linear.com
标志 LINER - Linear Technology

LTC3240-3.3 数据表(HTML) 1 Page - Linear Technology

  LTC3240-3.3_15 Datasheet HTML 1Page - Linear Technology LTC3240-3.3_15 Datasheet HTML 2Page - Linear Technology LTC3240-3.3_15 Datasheet HTML 3Page - Linear Technology LTC3240-3.3_15 Datasheet HTML 4Page - Linear Technology LTC3240-3.3_15 Datasheet HTML 5Page - Linear Technology LTC3240-3.3_15 Datasheet HTML 6Page - Linear Technology LTC3240-3.3_15 Datasheet HTML 7Page - Linear Technology LTC3240-3.3_15 Datasheet HTML 8Page - Linear Technology LTC3240-3.3_15 Datasheet HTML 9Page - Linear Technology Next Button
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LTC3240-3.3/LTC3240-2.5
1
3240fb
Step-Up/Step-Down Charge Pumps Generate Fixed
3.3V or 2.5V Outputs
VIN 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: IQ = 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 fixed
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 VOUT 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
FEATURES
DESCRIPTIO
TYPICAL APPLICATIO
OFF ON
VIN
GND
SHDN
VOUT
C
C+
LTC3240-3.3
1
µF
4.7
µF
1
µF
3.3V
IOUT = 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
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
IOUT = 30mA


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