LM3205 DC-DC Converter Datasheet

LM3205 Datasheet, PDF, Equivalent


Part Number

LM3205

Description

Step-Down DC-DC Converter

Manufacture

etcTI

Total Page 28 Pages
Datasheet
Download LM3205 Datasheet


LM3205
LM3205
www.ti.com
SNVS388E – JULY 2005 – REVISED APRIL 2013
LM3205 650mA Miniature, Adjustable, Step-Down DC-DC Converter for RF Power
Amplifiers
Check for Samples: LM3205
FEATURES
1
2 2 MHz (typ.) PWM Switching Frequency
• Operates from a Single Li-Ion Cell (2.7V to
5.5V)
• Variable Output Voltage (0.8V to 3.6V)
• Fast Output Voltage Transient (0.8V to 3.6V in
20µs)
• 650mA Maximum Load Capability
• High Efficiency (96% Typ at 4.2VIN, 3.4VOUT at
400mA) from Internal Synchronous
Rectification
• Current Overload Protection
• Thermal Overload Protection
• Packages
– 8-Pin DSBGA (Lead Free)
• 10-Pin WSON
APPLICATIONS
• Cellular Phones
• Hand-Held Radios
• RF PC Cards
• Battery Powered RF Devices
DESCRIPTION
The LM3205 is a DC-DC converter optimized for
powering RF power amplifiers (PAs) from a single
Lithium-Ion cell, however they may be used in many
other applications. It steps down an input voltage
from 2.7V to 5.5V to a variable output voltage from
0.8V(typ.) to 3.6V(typ.). Output voltage is set using a
VCON analog input for controlling power levels and
efficiency of the RF PA.
The LM3205 offers superior performance for mobile
phones and similar RF PA applications. Fixed-
frequency PWM operation minimizes RF interference.
Shutdown function turns the device off and reduces
battery consumption to 0.01 µA (typ.).
The LM3205 is available in DSBGA package and
WSON package. For all other package options
contact your local TI sales office.
A high switching frequency (2 MHz) 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
LM3205
FB
VCON PGND SGND
3.3 PH
VOUT
0.8V to 3.6V
VOUT = 2.5 x VCON
4.7 PF
Figure 1. LM3205 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 © 2005–2013, Texas Instruments Incorporated

LM3205
LM3205
SNVS388E – JULY 2005 – REVISED APRIL 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
NS Package Number YZR0008GNA
www.ti.com
PGND 1
PGND 2
SGND 3
VCON 4
FB 5
LM3205
10 SW
9 PVin
8 PVin
7 VDD
6 EN
SW 10
PVin 9
PVin 8
VDD 7
EN 6
LM3205
1 PGND
2 PGND
3 SGND
4 VCON
5 FB
Top View
Bottom View
Figure 3. 10–Pin WSON
NS Package Number DSC0010A
Pin #
DSBGA
WSON
A1 8, 9
B1 7
C1 6
C2 4
C3 5
B3 3
A3 1, 2
A2 10
Name
PIN DESCRIPTIONS
Description
PVIN
VDD
EN
VCON
FB
SGND
PGND
SW
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 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 LM3205.
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: LM3205
Copyright © 2005–2013, Texas Instruments Incorporated


Features LM3205 www.ti.com SNVS388E – JULY 20 05 – REVISED APRIL 2013 LM3205 650mA Miniature, Adjustable, Step-Down DC-DC Converter for RF Power Amplifiers Chec k for Samples: LM3205 FEATURES 1 •2 2 MHz (typ.) PWM Switching Frequency Operates from a Single Li-Ion Cell (2 .7V to 5.5V) • Variable Output Voltag e (0.8V to 3.6V) • Fast Output Voltag e Transient (0.8V to 3.6V in 20µs) • 650mA Maximum Load Capability • High Efficiency (96% Typ at 4.2VIN, 3.4VOUT at 400mA) from Internal Synchronous Re ctification • Current Overload Protec tion • Thermal Overload Protection Packages – 8-Pin DSBGA (Lead Free) • 10-Pin WSON APPLICATIONS • Cellul ar Phones • Hand-Held Radios • RF P C Cards • Battery Powered RF Devices DESCRIPTION The LM3205 is a DC-DC conv erter optimized for powering RF power a mplifiers (PAs) from a single Lithium-I on cell, however they may be used in ma ny other applications. It steps down an input voltage from 2.7V to 5.5V to a variable output voltage from 0.8V(typ.) to 3.6V(typ.). Outpu.
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