LM3673TL-1.5EV National Semiconductor, LM3673TL-1.5EV Datasheet

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LM3673TL-1.5EV

Manufacturer Part Number
LM3673TL-1.5EV
Description
BOARD EVALUATION LM3673TL-1.5
Manufacturer
National Semiconductor
Series
PowerWise®r
Datasheets

Specifications of LM3673TL-1.5EV

Main Purpose
DC/DC, Step Down
Outputs And Type
1, Non-Isolated
Voltage - Output
1.5V
Current - Output
350mA
Voltage - Input
2.7 ~ 5.5V
Regulator Topology
Buck
Frequency - Switching
2MHz
Board Type
Fully Populated
Utilized Ic / Part
LM3673
Lead Free Status / RoHS Status
Not applicable / Not applicable
Power - Output
-
© 2008 National Semiconductor Corporation
LM3673 Evaluation Board
Introduction
The LM3673 evaluation board is a working demonstration of
a step down DC-DC converter. This application note contains
information about the evaluation board. For further informa-
tion on buck converter topology, device electrical character-
istics, and component selection please refer to the datasheet.
General Description
The LM3673, a high efficient step down DC-DC switching
buck converter, steps down a constant voltage for cell
phones, PDA’s, and many other applications from a single Li-
Typical Application
FIGURE 2. Typical Application Circuit: Adjustable Voltage Option
FIGURE 1. Typical Application Circuit: Fixed Voltage Option
201907
National Semiconductor
Application Note 1465
Jose Escobar
October 10, 2008
ion battery ranging from 2.7V to 5.5V. The automatic intelli-
gent switching between PFM and PWM provides high
efficiency throughout the Iout range. The LM3673 is available
in both fixed and adjustable output voltages options ranging
from 1.1V to 3.3V in a 5-bump micro SMD package.
Operating Conditions
V
Recommended load current: 0 mA
Ambient temperature (T
Junction temperature (T
IN
range: 2.7V
V
IN
A
J
5.5V
) range: -30C to +125C
) range: -30C to +85C
20190715
20190716
I
OUT
www.national.com
350mA

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LM3673TL-1.5EV Summary of contents

Page 1

... PDA’s, and many other applications from a single Li- Typical Application FIGURE 1. Typical Application Circuit: Fixed Voltage Option FIGURE 2. Typical Application Circuit: Adjustable Voltage Option © 2008 National Semiconductor Corporation National Semiconductor Application Note 1465 Jose Escobar October 10, 2008 ion battery ranging from 2 ...

Page 2

Output Voltage Selection for LM3673MF-ADJ The output voltage of the adjustable parts can be pro- grammed through the resistor network connected from GND. The resistor from FB to GND (R 200kΩ to keep the current drawn ...

Page 3

Connection Diagram and Package Mark Information FIGURE 3. 5-bump Micro SMD Package Number TLA05CBA Pin Descriptions (5-bump Micro SMD) Pin# Name Description 1 V Power supply input. Connect to the input filter capacitor (Figure GND Ground pin ...

Page 4

Evaluation Board Layout www.national.com FIGURE 4. Top Layer (5-bump Micro SMD) FIGURE 5. Bottom Layer (5-bump Micro SMD) 4 20190721 20190723 ...

Page 5

... BOM For Common Configurations Manufacture LM3673TL - 1.5V FIXED C1 (input C) TDK C2 (output C) TDK L1 (inductor) Coilcraft Vishay OUT GND) None None OUT GND) None FB LM3673TL - 3.3V ADJUSTABLE C1 (input C) TDK C2 (output C) TDK L1 (inductor) Coilcraft Vishay OUT GND) Vishay Vishay OUT GND) Vishay FB COMMON TO ALL V ...

Page 6

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