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LM3203 Datasheet Preview

LM3203 Datasheet

Step-Down DC-DC Converter

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LM3203
www.ti.com
SNVS355D – MAY 2005 – REVISED APRIL 2013
LM3203 Step-Down DC-DC Converter with Bypass Mode for CDMA / WCDMA RF Power
Amplifiers
Check for Samples: LM3203
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)
• 500mA Maximum Load Capability (PWM and
Bypass Mode)
• PWM / Forced Bypass Mode
• Low RDSON Bypass FET: 85m(Typ.)
• High Efficiency (96% typ. at 3.6VIN, 3.2VOUT at
150mA)
• Fast Turn-On Time When Enabled (50µs typ.),
3GPP Compliant
• 10-Pin DSBGA Package
• Current Overload Protection
• Thermal Overload Protection
DESCRIPTION
The LM3203 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 of
2.7V to 5.5V to an adjustable output voltage of 0.8V
to 3.6V. The output voltage is set using a VCON
analog input and external resistor dividers for
optimizing efficiency of the RF PA at various power
levels.
The LM3203 offers 3 modes 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. Shutdown mode turns the device off
and reduces battery consumption to 0.1µA (typ.).
The LM3203 is available in a 10-pin lead free DSBGA
package. A high switching frequency (2MHz) allows
use of tiny surface-mount components.
APPLICATIONS
• Cellular Phones
• Hand-Held Radios
• RF PC Cards
• Battery Powered RF Devices
TYPICAL APPLICATION
VIN
2.7V to 5.5V
C1
10 PF
C5
0.1 PF
VCON
0.267V to 1.20V
VDD PVIN BYPOUT
SW
LM3203
EN
BYP
FB
VCON
SGND
PGND
L1
3.3 PH
C3
10 pF
R1
267k
R2
133k
VOUT
0.8V to 3.6V
C2
4.7 PF
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




etcTI

LM3203 Datasheet Preview

LM3203 Datasheet

Step-Down DC-DC Converter

No Preview Available !

LM3203
SNVS355D – MAY 2005 – REVISED APRIL 2013
CONNECTION DIAGRAMS
www.ti.com
SGND
A2
VDD A1
VCON B1
FB C1
A3 BYPOUT
B3 PVIN
C3 SW
BYP D1
D3 PGND
D2
EN
Figure 1. Top View
SGND
A2
BYPOUT A3
A1 VDD
PVIN B3
B1 VCON
SW C3
C1 FB
PGND D3
D1 BYP
D2
EN
Figure 2. Bottom View
10–Bump Thin DSBGA Package, Large Bump.
See NS Package Number YPA0010NHA.
Pin #
A1
B1
C1
D1
D2
D3
C3
B3
A3
A2
Name
VDD
VCON
FB
BYP
EN
PGND
SW
PVIN
BYPOUT
SGND
PIN DESCRIPTION
Description
Analog Supply Input. A 0.1 µF ceramic capacitor is recommended to be placed as close to this pin as
possible. (Figure 31)
Voltage Control Analog input. VCON controls VOUT in PWM mode. (Refer to Setting the Output Voltage) Do not
leave floating.
Feedback Analog Input. Connect to the external resistor divider. (Figure 31)
Bypass. Use this digital input to command operation in Bypass mode. Set BYP low for PWM 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 LM3203.
Power Supply Voltage Input to the internal PFET switch and Bypass FET. (Figure 31)
Bypass FET Drain. Connect to the output capacitor. (Figure 31) Connect this pin to VDD when Bypass mode is
NOT required. 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: LM3203
Copyright © 2005–2013, Texas Instruments Incorporated


Part Number LM3203
Description Step-Down DC-DC Converter
Maker etcTI
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