LM3676SD-ADJEV National Semiconductor, LM3676SD-ADJEV Datasheet

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LM3676SD-ADJEV

Manufacturer Part Number
LM3676SD-ADJEV
Description
BOARD EVALUATION LM3676SD-ADJ
Manufacturer
National Semiconductor
Datasheets

Specifications of LM3676SD-ADJEV

Main Purpose
DC/DC, Step Down
Outputs And Type
1, Non-Isolated
Voltage - Output
1 ~ 3.3V
Current - Output
600mA
Voltage - Input
2.9 ~ 5.5V
Regulator Topology
Buck
Frequency - Switching
2MHz
Board Type
Fully Populated
Utilized Ic / Part
LM3676
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Power - Output
-
Lead Free Status / Rohs Status
Not Compliant
© 2008 National Semiconductor Corporation
LM3676 Evaluation Board
Introduction
The LM3676 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 LM3676
datasheet.
General Description
The LM3676 converts high input voltages to lower output volt-
ages with high efficiency through an inductor based switching
topology. The LM3676 has a mode-control pin that allows the
user to select continuous Forced PWM mode over the com-
plete load range or an intelligent Auto, PFM-PWM, mode that
changes modes depending on the load. Setting the Mode pin
Typical Application
FIGURE 2. Typical Application Circuit: Adjustable Voltage
FIGURE 1. Typical Application Circuit: Fixed Voltage
202127
National Semiconductor
Application Note 1536
Jose Escobar
October 14, 2008
low (<0.4V) places the LM3676 in Auto mode were hysteretic
PFM extends the battery life through reduction of the quies-
cent current to 16µA (typ.) during light loads and system
standby. When the Mode pin is high (>1.0V) the part offers
superior efficiency under high load conditions (>100mA) and
the lowest output noise performance during Forced PWM.
The LM3676 is available in both fixed and adjustable output
voltage options ranging from 1.0V to 3.3V in a 8-lead non-
pullback LLP package (3mm X 3mm).
Operating Conditions
V
Recommended load current: 0 mA
Ambient temperature (T
Junction temperature (T
IN
range: 2.9V
V
IN
A
J
5.5V
) range: -30C to +125C
) range: -30C to +85C
20212715
20212716
I
OUT
www.national.com
600 mA

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LM3676SD-ADJEV Summary of contents

Page 1

... Auto, PFM-PWM, mode that changes modes depending on the load. Setting the Mode pin Typical Application FIGURE 1. Typical Application Circuit: Fixed Voltage FIGURE 2. Typical Application Circuit: Adjustable Voltage © 2008 National Semiconductor Corporation National Semiconductor Application Note 1536 Jose Escobar October 14, 2008 low (< ...

Page 2

... Output Voltage Selection for LM3676SD-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 throught this network small, but large enough that it is not susceptible to noise 200kΩ ...

Page 3

Connection Diagram and Package Mark Information Pin Descriptions (8-lead Non-Pullback LLP Package) Pin # Name 1 PGND MODE SGND 8 VIN 20212703 FIGURE 3. LLP, Top View Description Power supply ...

Page 4

Evaluation Board Layout www.national.com FIGURE 4. Top Layer (LLP-8 pin) 4 20212717 ...

Page 5

... BOM For Common Configurations Manufacture LM3676SD - 3.3V ADJUSTABLE C1 (input C) TDK C2 (output C) TDK L1 (inductor) Coilcraft Vishay OUT GND) Vishay Vishay OUT GND) Vishay FB V banana jack - red Johnson IN Components V banana jack - yellow Johnson OUT Components GND banana jack - black Johnson Components Post for EN ...

Page 6

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