LM3677TL-1.8EV National Semiconductor, LM3677TL-1.8EV Datasheet

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LM3677TL-1.8EV

Manufacturer Part Number
LM3677TL-1.8EV
Description
BOARD EVALUATION LM3677TL-1.8
Manufacturer
National Semiconductor
Series
PowerWise®r

Specifications of LM3677TL-1.8EV

Main Purpose
DC/DC, Step Down
Outputs And Type
1, Non-Isolated
Voltage - Output
1.8V
Current - Output
600mA
Voltage - Input
2.7 ~ 5.5V
Regulator Topology
Buck
Frequency - Switching
3MHz
Board Type
Fully Populated
Utilized Ic / Part
LM3677
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Power - Output
-
© 2008 National Semiconductor Corporation
LM3677 Evaluation Board
Introduction
The LM3677 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 LM3677 converts high input voltages to lower output volt-
ages with high efficiency through an inductor based switching
topology. Automatic intelligent switching between PWM low-
noise and PFM low-current mode offers improved system
control. LM3677 is available in both fixed output voltage op-
tions and adjustable voltage options range from 1.2V to 3.3V
in a micro SMD-5 package. The fixed output voltage options
Typical Application
FIGURE 2. Adjustable Output Voltage—Typical Application Circuit
FIGURE 1. Fixed Output Voltage--Typical Application Circuit
300120
National Semiconductor
Application Note 1595
Jingdong Chen
October 14, 2008
available in a micro SMD-5 package are 1.2V, 1.3V, 1.5V,
1.6V, 1.8V, 2.5V, 2.8V, and 3.3V. The LM3677 is also avail-
able in a 6–pin LLP package with fixed voltage options 1.2V,
1.5V, 1.8V, and 1.82V.
Operating Conditions
Recommended input voltage range:
V
V
V
where V
Recommended load current: 0 mA
Ambient temperature (T
Junction temperature (T
IN
IN
IN
= 2.7V to 4.5V for 1.1V
= 2.7V to 5.5V for 1.5V
= (V
OUT
DROPOUT
+ V
DROPOUT
= I
LOAD
) to 5.5V for 1.8V
A
* (R
J
) range: -30°C to +125°C
) range: -30°C to +85°C
30012025
30012026
DSON, PFET
V
V
OUT
OUT
< 1.5V
< 1.8V
I
OUT
+ R
INDUCTOR
www.national.com
V
600 mA
OUT
)
3.3V

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LM3677TL-1.8EV Summary of contents

Page 1

... SMD-5 package. The fixed output voltage options Typical Application FIGURE 1. Fixed Output Voltage--Typical Application Circuit FIGURE 2. Adjustable Output Voltage—Typical Application Circuit © 2008 National Semiconductor Corporation National Semiconductor Application Note 1595 Jingdong Chen October 14, 2008 available in a micro SMD-5 package are 1 ...

Page 2

... Output Voltage Selection for LM3677TL-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 200 kΩ to keep the current drawn through this network well below 16 µA quiescent current level (PFM mode) but large enough that it is not susceptible to noise ...

Page 3

Connection Diagrams and Package Mark Information Pin Descriptions Pin# Name GND 2,5 SW FIGURE 3. 5-bump micro SMD Package FIGURE 4. 6–pin LLP Package Description Power supply ...

Page 4

Evaluation Board Layout www.national.com FIGURE 5. Top Layer (5-bump micro SMD) FIGURE 6. Bottom Layer (5-bump micro SMD) 4 30012024 30012023 ...

Page 5

FIGURE 7. Top Layer (6–pin LLP) FIGURE 8. Bottom Layer (6–pin LLP) 5 30012008 30012009 www.national.com ...

Page 6

... BOM For Common Configurations LM3677TL - 1.8V FIXED C1 (input C) C2 (output C) L1 (inductor OUT GND OUT GND banana jack - red IN V banana jack - yellow OUT GND banana jack - black LM3677LE - 1.8V FIXED C1 (input C) C2 (output C) L1 (inductor GND OUT GND OUT FB V banana jack - red ...

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7 www.national.com ...

Page 8

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