LTC3240EDC-3.3#TRMPBF Linear Technology, LTC3240EDC-3.3#TRMPBF Datasheet

IC DC/DC CONV 3.3V 6-DFN

LTC3240EDC-3.3#TRMPBF

Manufacturer Part Number
LTC3240EDC-3.3#TRMPBF
Description
IC DC/DC CONV 3.3V 6-DFN
Manufacturer
Linear Technology
Type
Step-Down (Buck), Step-Up (Boost), Switched Capacitor (Charge Pump)r
Datasheet

Specifications of LTC3240EDC-3.3#TRMPBF

Internal Switch(s)
Yes
Synchronous Rectifier
No
Number Of Outputs
1
Voltage - Output
3.3V
Current - Output
150mA
Frequency - Switching
1.2MHz
Voltage - Input
1.8 ~ 5.5 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
6-DFN
Operating Supply Voltage (min)
1.8V
Operating Supply Voltage (max)
5.5V
Operating Temp Range
-40C to 85C
Operating Temperature Classification
Industrial
Package Type
DFN
Pin Count
6
Mounting
Surface Mount
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Power - Output
-
Lead Free Status / Rohs Status
Compliant
Other names
LTC3240EDC-3.3#TRMPBF
LTC3240EDC-3.3#TRMPBFTR

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
LTC3240EDC-3.3#TRMPBFLTC3240EDC-3.3
Manufacturer:
LT
Quantity:
10 000
Company:
Part Number:
LTC3240EDC-3.3#TRMPBFLTC3240EDC-3.3#PBF
Manufacturer:
LT
Quantity:
599
Company:
Part Number:
LTC3240EDC-3.3#TRMPBFLTC3240EDC-3.3#PBF
Manufacturer:
LINEAR/凌特
Quantity:
20 000
Company:
Part Number:
LTC3240EDC-3.3#TRMPBF
Manufacturer:
LINEAR/凌特
Quantity:
20 000
Company:
Part Number:
LTC3240EDC-3.3#TRMPBFLTC3240EDC-3.3#TRPBF
Manufacturer:
LINEAR/凌特
Quantity:
20 000
APPLICATIO S
FEATURES
TYPICAL APPLICATIO
2.7V TO 4.5V
Step-Up/Step-Down Charge Pumps Generate Fixed
3.3V or 2.5V Outputs
V
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
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
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
3-CELL NiMH
IN
Li-Ion OR
Range: 1.8V to 5.5V
Li-Ion to 3.3V at Up to 150mA
1µF
OFF ON
U
V
GND
SHDN
LTC3240-3.3
IN
C
1µF
V
C
OUT
U
+
Q
3240 TA01a
= 65µA
4.7µF
3.3V
I
OUT
= 150mA
DESCRIPTIO
The LTC
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
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.
All other trademarks are the property of their respective owners.
Protected by U.S. Patents including 6411531.
Step-Down Charge Pump
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
LTC3240-3.3/LTC3240-2.5
®
Output Voltage vs Input Voltage (Full Range)
3240-3.3/LTC3240-2.5 are step-up/step-down
3.50
3.45
3.40
3.35
3.30
3.25
3.20
3.15
3.10
1.7
I
OUT
3.3V/2.5V Step-Up/
2.2
= 30mA
DC/DC Converter
U
2.7
INPUT VOLTAGE (V)
3.2
3.7
4.2
OUT
4.7
to GND.
3240 TA01b
5.2
5.7
3240fb
1

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LTC3240EDC-3.3#TRMPBF Summary of contents

Page 1

... The LTC3240-3.3/LTC3240-2.5 are available in a 6-pin (2mm × 2mm) DFN package. , 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. ...

Page 2

... JMAX EXPOSED PAD (PIN 7) IS GND, MUST BE SOLDERED TO PCB ORDER PART NUMBER LTC3240EDC-3.3 LTC3240EDC-2.5 Order Options Tape and Reel: Add #TR Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF Lead Free Part Marking: Consult LTC Marketing for parts specifi ed with wider operating temperature ranges. ...

Page 3

ELECTRICAL CHARACTERISTICS temperature range, otherwise specifi cations are at T SYMBOL PARAMETER R Effective Open-Loop OL Output Resistance LTC3240-3.3 LTC3240-2.5 (Note 3) Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure ...

Page 4

LTC3240-3.3/LTC3240-2 TYPICAL PERFOR A CE CHARACTERISTICS unless otherwise noted) Effective Open-Loop Resistance vs Temperature (LTC3240-3. 1. OUT –40 – TEMPERATURE (°C) 3240 G07 ...

Page 5

W U TYPICAL PERFOR A CE CHARACTERISTICS unless otherwise noted) Load Transient Response (LTC3240-3.3) V OUT 20mV/DIV LDO MODE AC COUPLED 60mA I LOAD 10mA V = 3.7V 10µs/DIV 10mA TO 60mA LOAD ...

Page 6

LTC3240-3.3/LTC3240-2.5 W BLOCK DIAGRA V 3 OUT SWITCH CONTROL OSCILLATOR – + – 100mV OUT CHARGE PUMP 1, 7 GND SOFT-START 6 SHDN AND 1.2MHz + 4 C – 3204 BD ...

Page 7

U OPERATIO (Refer to the Block Diagram) The LTC3240 is a step-up/step-down charge pump DC/DC converter. For V greater than V IN OUT operates as a low dropout regulator. Once V within 100mV the part automatically switches ...

Page 8

LTC3240-3.3/LTC3240-2 APPLICATIO S I FOR ATIO Power Effi ciency During LDO operation, the power effi ciency (η) of the LTC3240 is given by • OUT OUT OUT OUT η ...

Page 9

U U APPLICATIO S I FOR ATIO In charge pump mode the value of C OUT amount of output ripple for a given load current. Increasing the size of C will reduce the output ripple at the expense OUT of ...

Page 10

LTC3240-3.3/LTC3240-2 APPLICATIO S I FOR ATIO to additional switch resistance. However, for very light load applications, the above expression can be used as a guideline in determining a starting capacitor value. Ceramic Capacitors Ceramic capacitors of different materials ...

Page 11

... SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION ON THE TOP AND BOTTOM OF PACKAGE Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights. LTC3240-3.3/LTC3240-2.5 ...

Page 12

... DC/DC Converter LTC3441 High Current Micropower 1MHz Synchronous Buck-Boost DC/DC Converter LTC3443 High Current Micropower 600kHz Synchronous Buck-Boost DC/DC Converter ThinSOT is a trademark of Linear Technology Coorporation Linear Technology Corporation 12 1630 McCarthy Blvd., Milpitas, CA 95035-7417 ● (408) 432-1900 FAX: (408) 434-0507 2.5V Output from 2-Cell NiMH 1µ ...

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