LM3204 DC-DC Converter Datasheet

LM3204 Datasheet, PDF, Equivalent


Part Number

LM3204

Description

Step-Down DC-DC Converter

Manufacture

etcTI

Total Page 23 Pages
Datasheet
Download LM3204 Datasheet


LM3204
LM3204
www.ti.com
SNVS351B – JUNE 2005 – REVISED NOVEMBER 2005
LM3204 Miniature, Adjustable, Step-Down DC-DC Converter with Bypass Mode for RF
Power Amplifiers
Check for Samples: LM3204
FEATURES
1
2 2MHz (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 Turn on time when Enabled (50µs Typ.),
3GPP Compliant
• 300mA Maximum load capability (PWM mode)
• 500mA Maximum load capability (Bypass
mode)
• PWM, Forced and Automatic Bypass Mode
• High Efficiency (96% Typ. at 3.6VIN, 3.2VOUT at
120mA)
• 10-pin micro SMD Package
• Current Overload Protection
• Thermal Overload Protection
APPLICATIONS
• Cellular Phones
• Hand-Held Radios
• RF PC Cards
• Battery Powered RF Devices
DESCRIPTION
The LM3204 is a DC-DC converter optimized for powering RF power amplifiers (PAs) from a single Lithium-Ion
cell. It steps down an input voltage of 2.7V to 5.5V to an adjustable output voltage of 0.8V to 3.6V. The output
voltage is set using an analog input ( VCON) for optimizing efficiency of the RF PA at various power levels.
The LM3204 offers superior features and performance for mobile phones and similar RF PA applications. Fixed-
frequency PWM mode minimizes RF interference. Bypass mode turns on an internal bypass switch to power the
PA directly from the battery. LM3204 has both forced and automatic bypass modes. Shutdown mode turns the
device off and reduces battery consumption to 0.1µA (typ.).
The LM3204 is available in a 10-pin lead free micro SMD package. A high switching frequency (2MHz) 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
C1
10 PF
C4
0.1 PF
VCON
0.267V to 1.20V
PVIN VDD
BYPOUT
EN
BYP LM3204
SW
FB
VCON
PGND SGND
L1
2.2 PH
VOUT
0.8V to 3.6V
VOUT = 3 x VCON
C2
4.7 PF
Connection Diagrams
10–Bump Thin Micro SMD Package, Large Bump. See NS Package Number TLP10NHA.
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, Texas Instruments Incorporated

LM3204
LM3204
SNVS351B – JUNE 2005 – REVISED NOVEMBER 2005
www.ti.com
VDD A1
VCON B1
FB C1
SGND
A2
A3 BYPOUT
B3 PVIN
C3 SW
BYP D1
D3 PGND
D2
EN
Figure 1. Top View
BYPOUT A3
PVIN B3
SW C3
SGND
A2
A1 VDD
B1 VCON
C1 FB
PGND D3
D1 BYP
D2
EN
Figure 2. Bottom View
Pin #
A1
B1
C1
D1
D2
D3
C3
B3
A3
A2
Name
VDD
VCON
FB
BYP
EN
PGND
SW
PVIN
BYPOUT
SGND
Table 1. Pin Description
Description
Analog Supply Input. A 0.1µF ceramic capacitor is recommended to be placed as close to this pin as possible.
(Figure 3)
Voltage Control Analog input. VCON controls VOUT in PWM mode. Set: VOUT = 3 x VCON. Do not leave floating.
Feedback Analog Input. Connect to the output at the output filter capacitor. (Figure 3)
Bypass. Use this digital input to command operation in Bypass mode. Set BYP low (<0.4V) for normal
operation.
Enable Input. Set this digital input high (>1.2V) after Vin >2.7V for normal operation. For shutdown, set low
(<0.4V).
Power Ground
Switching 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 LM3204.
Power Supply Voltage Input to the internal PFET switch and Bypass FET. (Figure 3)
Bypass FET Drain. Connect to the output capacitor. (Figure 3) Do not leave floating.
Analog and Control Ground
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: LM3204
Copyright © 2005, Texas Instruments Incorporated


Features LM3204 www.ti.com SNVS351B – JUNE 20 05 – REVISED NOVEMBER 2005 LM3204 Mi niature, Adjustable, Step-Down DC-DC Co nverter with Bypass Mode for RF Power A mplifiers Check for Samples: LM3204 FE ATURES 1 •2 2MHz (typ.) PWM Switching Frequency • Operates from a single L i-Ion cell (2.7V to 5.5V) • Adjustabl e Output Voltage (0.8V to 3.6V) • Fas t Turn on time when Enabled (50µs Typ. ), 3GPP Compliant • 300mA Maximum loa d capability (PWM mode) • 500mA Maxim um load capability (Bypass mode) • PW M, Forced and Automatic Bypass Mode High Efficiency (96% Typ. at 3.6VIN, 3.2VOUT at 120mA) • 10-pin micro SMD Package • Current Overload Protection • Thermal Overload Protection APPLIC ATIONS • Cellular Phones • Hand-Hel d Radios • RF PC Cards • Battery Po wered RF Devices DESCRIPTION The LM320 4 is a DC-DC converter optimized for po wering RF power amplifiers (PAs) from a single Lithium-Ion cell. It steps down an input voltage of 2.7V to 5.5V to an adjustable output voltage of 0.8V to 3.6V. The output volt.
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