LM3224 DC/DC Converter Datasheet

LM3224 Datasheet, PDF, Equivalent


Part Number

LM3224

Description

615kHz/1.25MHz Step-up PWM DC/DC Converter

Manufacture

etcTI

Total Page 28 Pages
Datasheet
Download LM3224 Datasheet


LM3224
LM3224
www.ti.com
SNVS277C – DECEMBER 2004 – REVISED MARCH 2013
LM3224 615kHz/1.25MHz Step-up PWM DC/DC Converter
Check for Samples: LM3224
FEATURES
1
2 Operating Voltage Range of 2.7V to 7V
• 615kHz/1.25MHz Pin Selectable Frequency
Operation
• Over Temperature Protection
• Optional Soft-Start Function
• 8-Lead VSSOP Package
APPLICATIONS
• TFT Bias Supplies
• Handheld Devices
• Portable Applications
• GSM/CDMA Phones
• Digital Cameras
• White LED Flash/Torch Applications
DESCRIPTION
The LM3224 is a step-up DC/DC converter with a
0.15Ω (typ.), 2.45A (typ.) internal switch and pin
selectable operating frequency. With the ability to
convert 3.3V to multiple outputs of 8V, -8V, and 23V,
the LM3224 is an ideal part for biasing TFT displays.
With the high current switch it is also ideal for driving
high current white LEDs for flash applications. The
LM3224 can be operated at switching frequencies of
615kHz and 1.25MHz allowing for easy filtering and
low noise. An external compensation pin gives the
user flexibility in setting frequency compensation,
which makes possible the use of small, low ESR
ceramic capacitors at the output. An external soft-
start pin allows the user to control the amount of
inrush current during start up. The LM3224 is
available in a low profile 8-lead VSSOP package.
Typical Application Circuit
VIN L
D
Battery or
Power Source
5
6 VIN
SW 7
FSLCT
3 SHDN LM3224
2
CIN
8
SS VC
FB
GND
14
Optional
RC
CSS
CC
RFB1
VOUT
RFB2
COUT
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
All trademarks are the property of their respective owners.
2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2004–2013, Texas Instruments Incorporated

LM3224
LM3224
SNVS277C – DECEMBER 2004 – REVISED MARCH 2013
Connection Diagram
1
VC
2
FB
3
SHDN
4
GND
8
SS
7
FSLCT
6
VIN
5
SW
Figure 1. 8-Lead Plastic VSSOP
Top View
Package Number DGK0008A
www.ti.com
PIN DESCRIPTIONS
Pin Name
Function
1 VC Compensation network connection. Connected to the output of the voltage error amplifier.
2 FB Output voltage feedback input.
3
SHDN
Shutdown control input, active low. This pin has an internal pulldown resistor so the default condition
is off. The pin must be pulled high to turn on the device.
4
GND
Analog and power ground.
5 SW Power switch input. Switch connected between SW pin and GND pin.
6 VIN Analog power input.
7
FSLCT
Switching frequency select input. VIN = 1.25MHz. Ground = 615kHz.
8 SS Soft-start Pin.
2 Submit Documentation Feedback
Product Folder Links: LM3224
Copyright © 2004–2013, Texas Instruments Incorporated


Features LM3224 www.ti.com SNVS277C – DECEMBE R 2004 – REVISED MARCH 2013 LM3224 6 15kHz/1.25MHz Step-up PWM DC/DC Convert er Check for Samples: LM3224 FEATURES 1 •2 Operating Voltage Range of 2.7V to 7V • 615kHz/1.25MHz Pin Selectable Frequency Operation • Over Temperatu re Protection • Optional Soft-Start F unction • 8-Lead VSSOP Package APPLIC ATIONS • TFT Bias Supplies • Handhe ld Devices • Portable Applications GSM/CDMA Phones • Digital Cameras White LED Flash/Torch Applications DESCRIPTION The LM3224 is a step-up DC/ DC converter with a 0.15Ω (typ.), 2.45 A (typ.) internal switch and pin select able operating frequency. With the abil ity to convert 3.3V to multiple outputs of 8V, -8V, and 23V, the LM3224 is an ideal part for biasing TFT displays. Wi th the high current switch it is also i deal for driving high current white LED s for flash applications. The LM3224 ca n be operated at switching frequencies of 615kHz and 1.25MHz allowing for easy filtering and low noise. An external compensation .
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