LM3208 DC-DC Converter Datasheet

LM3208 Datasheet, PDF, Equivalent


Part Number

LM3208

Description

Step-Down DC-DC Converter

Manufacture

etcTI

Total Page 25 Pages
Datasheet
Download LM3208 Datasheet


LM3208
LM3208
www.ti.com
SNVS404B – APRIL 2006 – REVISED MARCH 2013
LM3208 650mA Miniature, Adjustable, Step-Down DC-DC Converter for RF Power
Amplifiers
Check for Samples: LM3208
FEATURES
1
2 2 MHz (typ.) PWM Switching Frequency
• Operates from a Single Li-Ion Cell (2.7V to
5.5V)
• Adjustable Output Voltage (0.8V to 3.6V)
• Fast Output Voltage Transient (0.8V to 3.4V in
25µs typ.)
• 650mA Maximum Load Capability
• High Efficiency (95% typ. at 3.9VIN, 3.4VOUT at
400mA)
• 8-pin DSBGA Package
• Current Overload Protection
• Thermal Overload Protection
APPLICATIONS
• Cellular Phones
• Hand-Held Radios
• RF PC Cards
• Battery Powered RF Devices
DESCRIPTION
The LM3208 is a DC-DC converter optimized for
powering RF power amplifiers (PAs) from a single
Lithium-Ion cell. However, it may be used in many
other applications. It steps down an input voltage in
the range from 2.7V to 5.5V to an adjustable output
voltage of 0.8V to 3.6V. Output voltage is set by
using a VCON analog input to control power levels and
efficiency of the RF PA.
The LM3208 offers superior performance for mobile
phones and similar RF PA applications. Fixed-
frequency PWM operation minimizes RF interference.
A shutdown function turns the device off and reduces
battery consumption to 0.01 µA (typ.).
The LM3208 is available in an 8-pin lead-free DSBGA
package. A high switching frequency (2 MHz typ.)
allows use of tiny surface-mount components. Only
three small external surface-mount components, an
inductor and two ceramic capacitors, are required.
TYPICAL APPLICATION
VIN
2.7V to 5.5V
10 PF
PVIN
EN
VDD
SW
LM3208
FB
VCON PGND SGND
3.3 PH
VOUT
0.8V to 3.6V
VOUT = 2.5 x VCON
4.7 PF
Figure 1. LM3208 Typical Application
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 © 2006–2013, Texas Instruments Incorporated

LM3208
LM3208
SNVS404B – APRIL 2006 – REVISED MARCH 2013
CONNECTION DIAGRAMS
PVIN A1
VDD B1
EN C1
SW
A2
C2
VCON
A3 PGND
B3 SGND
C3 FB
PGND A3
SGND B3
FB C3
SW
A2
C2
VCON
A1 PVIN
B1 VDD
C1 EN
Top View
Bottom View
Figure 2. 8-Bump Thin DSBGA Package, Large Bump
Package Number YZR0008GNA
www.ti.com
Pin #
A1
B1
C1
C2
C3
B3
A3
A2
Name
PVIN
VDD
EN
VCON
FB
SGND
PGND
SW
PIN DESCRIPTIONS
Description
Power Supply Voltage Input to the internal PFET switch.
Analog Supply Input.
Enable Input. Set this digital input high for normal operation. For shutdown, set this pin low.
Voltage Control Analog input. VCON controls VOUT in PWM mode.
Feedback Analog Input. Connect to the output at the output filter capacitor.
Analog and Control Ground
Power Ground
Switch node connection to the internal PFET switch and NFET synchronous rectifier.
Connect to an inductor with a saturation current rating that exceeds the maximum Switch Peak Current Limit
specification of the LM3208.
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
2 Submit Documentation Feedback
Product Folder Links: LM3208
Copyright © 2006–2013, Texas Instruments Incorporated


Features LM3208 www.ti.com SNVS404B – APRIL 2 006 – REVISED MARCH 2013 LM3208 650m A Miniature, Adjustable, Step-Down DC-D C Converter for RF Power Amplifiers Che ck for Samples: LM3208 FEATURES 1 •2 2 MHz (typ.) PWM Switching Frequency Operates from a Single Li-Ion Cell ( 2.7V to 5.5V) • Adjustable Output Vol tage (0.8V to 3.6V) • Fast Output Vol tage Transient (0.8V to 3.4V in 25µs t yp.) • 650mA Maximum Load Capability • High Efficiency (95% typ. at 3.9VIN , 3.4VOUT at 400mA) • 8-pin DSBGA Pac kage • Current Overload Protection Thermal Overload Protection APPLICATI ONS • Cellular Phones • Hand-Held R adios • RF PC Cards • Battery Power ed RF Devices DESCRIPTION The LM3208 i s a DC-DC converter optimized for power ing RF power amplifiers (PAs) from a si ngle Lithium-Ion cell. However, it may be used in many other applications. It steps down an input voltage in the rang e from 2.7V to 5.5V to an adjustable ou tput voltage of 0.8V to 3.6V. Output voltage is set by using a VCON analog input to control po.
Keywords LM3208, datasheet, pdf, etcTI, Step-Down, DC-DC, Converter, M3208, 3208, 208, LM320, LM32, LM3, Equivalent, stock, pinout, distributor, price, schematic, inventory, databook, Electronic, Components, Parameters, parts, cross reference, chip, Semiconductor, circuit, Electric, manual, substitute




@ 2014 :: Datasheetspdf.com :: Semiconductors datasheet search & download site (Privacy Policy & Contact)