Power Amplifiers. LM3200 Datasheet

LM3200 Datasheet PDF, Equivalent


Part Number

LM3200

Description

Step-Down DC-DC Converter with Bypass Mode for RF Power Amplifiers

Manufacture

National Semiconductor

Total Page 15 Pages
PDF Download
Download LM3200 Datasheet PDF


LM3200 Datasheet
November 2004
LM3200
Miniature, Adjustable, Step-Down DC-DC Converter with
Bypass Mode for RF Power Amplifiers
General Description
The LM3200 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 a variable
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 LM3200 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. LM3200 has both forced and auto-
matic bypass modes. Shutdown mode turns the device off
and reduces battery consumption to 0.1 µA (typ.). The
LM3200 is available in a 10-pin lead free micro SMD pack-
age. 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.
Features
n 2 MHz (typ.) PWM Switching Frequency
n Operates from a single Li-Ion cell (2.7V to 5.5V)
n Variable Output Voltage (0.8V to 3.6V)
n 300 mA Maximum load capability (PWM mode)
n 500 mA Maximum load capability (Bypass mode)
n PWM, Forced and Automatic Bypass Mode
n High Efficiency (96% Typ at 3.6VIN, 3.2VOUT at 120 mA)
from internal synchronous rectification
n 10-pin micro SMD Package
n Current Overload Protection
n Thermal Overload Protection
Applications
n Cellular Phones
n Hand-Held Radios
n RF PC Cards
n Battery Powered RF Devices
Typical Application
20126101
© 2004 National Semiconductor Corporation DS201261
www.national.com

LM3200 Datasheet
Connection Diagrams
Top View
20126102
Bottom View
20126103
10–Bump Thin Micro SMD Package, Large Bump
See NS Package Number TLP10NHA
Order Information
Order Number Package Marking (Note)
Supplied As
LM3200TL
XYTT SCUB
250 Units, Tape and Reel
LM3200TLX
XYTT SCUB
3000 Units, Tape and Reel
Note: The package marking “XY” designates the date code. “TT” is a NSC internal code for die traceability.
Pin Description
Pin #
A1
Name
VDD
B1 VCON
C1 FB
D1 BYP
D2 EN
D3 PGND
C3 SW
B3 PVIN
A3 BYPOUT
A2 SGND
Description
Analog Supply Input. A 0.1 µF ceramic capacitor is recommended to be placed as close to this
pin as possible. (Figure 1)
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 1)
Bypass. Use this digital input to command operation in Bypass mode. Set BYP low for normal
operation.
Enable Input. Set this digital input high after Vin >2.7V for normal operation. For shutdown, set
low.
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 LM3200.
Power Supply Voltage Input to the internal PFET switch and Bypass FET. (Figure 1)
Bypass FET Drain. Connect to the output capacitor. (Figure 1) Do not leave floating.
Analog and Control Ground
www.national.com
2


Features Datasheet pdf LM3200 Miniature, Adjustable, Step-Down DC-DC Converter with Bypass Mode for RF Power Amplifiers November 2004 LM320 0 Miniature, Adjustable, Step-Down DC-D C Converter with Bypass Mode for RF Pow er Amplifiers General Description The L M3200 is a DC-DC converter optimized fo r powering RF power amplifiers (PAs) fr om a single Lithium-Ion cell. It steps down an input voltage of 2.7V to 5.5V t o a variable output voltage of 0.8V to 3.6V. The output voltage is set using a n analog input ( VCON) for optimizing e fficiency of the RF PA at various power levels. The LM3200 offers superior fea tures and performance for mobile phones and similar RF PA applications. Fixedf requency PWM mode minimizes RF interfer ence. Bypass mode turns on an internal bypass switch to power the PA directly from the battery. LM3200 has both force d and automatic bypass modes. Shutdown mode turns the device off and reduces b attery consumption to 0.1 µA (typ.). T he LM3200 is available in a 10-pin lead free micro SMD package. .
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