LM26420YMHEVAL/NOPB National Semiconductor, LM26420YMHEVAL/NOPB Datasheet

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LM26420YMHEVAL/NOPB

Manufacturer Part Number
LM26420YMHEVAL/NOPB
Description
BOARD EVAL SYNC BUCK 550KHZ
Manufacturer
National Semiconductor
Series
PowerWise®r
Datasheets
1.LM26420XSQNOPB.pdf (28 pages)
2.LM26420XMHEVALNOPB.pdf (10 pages)

Specifications of LM26420YMHEVAL/NOPB

Main Purpose
DC/DC, Step Down
Outputs And Type
2, Non-Isolated
Voltage - Output
1.2V, 2.5V
Current - Output
2A, 2A
Voltage - Input
3 ~ 5.5V
Regulator Topology
Buck
Frequency - Switching
550kHz
Board Type
Fully Populated
Utilized Ic / Part
LM26420
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Power - Output
-
Other names
LM26420YMHEVAL
© 2009 National Semiconductor Corporation
LM26420 Evaluation Board
Introduction
The LM26420 Evaluation board was designed to provide two
2A outputs, V
eTSSOP package option of the LM26420 for easier probing
or the LLP version for evaluating the smaller package. The
design emphasizes on the compactness of the LM26420 PCB
layout and is thermally optimized. The total solution size is
less than 35mm by 40mm. The board supports the conversion
from an input voltage ranging from 3V to 5.5V down to output
voltages of 0.8V for each channel. V
to 1.2V and 2.5V respectively. The feedback resistor can be
changed to support output voltages as low as 0.8V or as high
at 4.5V, assuming V
pins are pulled up to V
can also be easily controlled by external logic.
The board’s specifications are:
•
•
•
•
•
Typical Application Circuit
Input Voltage: 3V to 5.5V
Output Voltages: 1.2V
Maximum load current: 2A/output
Minimum load current: 0A
Size: 1.35 in. x 1.6 in.
OUT1
and V
IN
is high enough to support it. The EN
IN
by jumpers for easy evaluation but
OUT1
OUT2
and 2.5V
. It is available in either the
OUT1
OUT2
300697
and V
LM26420 Demo Board Schematic
OUT2
are set
National Semiconductor
Application Note 1870
Francis Houde
April 14, 2009
•
•
Powering Up The Board
Since the EN pins are directly tied to the input voltage via
jumpers J
necting a voltage supply from 3V to 5.5V between the V
GND terminals. There should be 1.2V on V
V
channel. Great care should be taken in powering up the sup-
plies such that the input voltage, V
Absolute Maximum Rating of 7V. If the part experiences volt-
ages greater than 7V for a prolonged period of time, then
damage to the part can occur and then the evaluation board
may cease working.
The linear soft-start ramps for the two output voltages and
should last about 600 µs. Load can be applied prior to power-
up. If an output is shorted either before or after start-up,
removal of the short-circuit condition should bring the corre-
sponding output back to normal voltage.
OUT2
Peak Current Limit:
Nominal Switching Frequency: 550 kHz or 2.2MHz
, assuming the jumpers connect V
1
and J
2
, starting up the board is as simple as con-
≊
3.2A at 25°C
IN
, does not exceed the
IN
30069713
OUT1
to EN for each
www.national.com
and 2.5V on
IN
and

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LM26420YMHEVAL/NOPB Summary of contents

Page 1

... OUT1 • Maximum load current: 2A/output • Minimum load current: 0A • Size: 1.35 in. x 1.6 in. Typical Application Circuit © 2009 National Semiconductor Corporation National Semiconductor Application Note 1870 Francis Houde April 14, 2009 • Peak Current Limit: • Nominal Switching Frequency: 550 kHz or 2.2MHz ...

Page 2

LLP Board Schematic Connection Diagram Pin Descriptions 16-Pin LLP Pin Name 1,2 VIND 1 11, 12 VIND 2 15 VINC 4 PGND 1 9 PGND 2 14 AGND ...

Page 3

Board Schematic Connection Diagram Pin Descriptions 20-Pin eTSSOP Pin Name Function 3, 4 VIND Power Input supply for Buck1. 1 17, 18 VIND Power Input supply for Buck2 VINC Power Input supply for control circuitry. 6,7 PGND ...

Page 4

Bill of Materials - X Version Item Designator Description 1 C1, C2, C3, C4, C6, C7 22µF, 6.3V, X5R, 1206 2 C5 0.47µF, 16V, X7R, 0603 3 L1, L2 1µH, 6. 5.1k, 1%, 603 5 R2 21.3k, 1%, ...

Page 5

Bill of Materials - Y Version Item Designator Description 1 C1, C2, C3, C4, C6, C7 22µF, 6.3V, X5R, 1206 2 C5 0.47µF, 16V, X7R, 0603 3 L1, L2 3.3µH, 6. 5.1k, 1%, 603 5 R2 21.3k, 1%, ...

Page 6

PCB Layout eTSSOP - Top Layer eTSSOP - Layer 3 www.national.com eTSSOP - Layer 2 30069725 eTSSOP - Bottom Layer 30069727 6 30069726 30069728 ...

Page 7

LLP-16 PCB Layout LLP - Top Layer LLP - Layer 3 LLP - Layer 2 30069729 LLP - Bottom Layer 30069731 7 30069730 30069732 www.national.com ...

Page 8

Typical Performance Characteristics Efficiency - 1.2V OUT Efficiency - 1.2V OUT Load Step Response - X Version www.national.com - X Version 30069704 - Y Version 30069706 30069708 8 Efficiency - 2. Version OUT 30069705 Efficiency - 2.5V - ...

Page 9

Typical Performance Characteristics Steady State Operation - Y Version Start- Applied IN 30069710 30069712 9 Enable 30069711 www.national.com ...

Page 10

... For more National Semiconductor product information and proven design tools, visit the following Web sites at: Products Amplifiers www.national.com/amplifiers Audio www.national.com/audio Clock and Timing www.national.com/timing Data Converters www.national.com/adc Interface www.national.com/interface LVDS www.national.com/lvds Power Management www.national.com/power Switching Regulators www.national.com/switchers LDOs www.national.com/ldo LED Lighting www ...

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