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DC2422A-A

Description
EVAL BOARD FOR LTC7812
CategoryDevelopment board/suite/development tools   
File Size418KB,14 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
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DC2422A-A Overview

EVAL BOARD FOR LTC7812

DC2422A-A Parametric

Parameter NameAttribute value
The main purposeDC/DC, step up/step down
Output and type1. Non-isolation
Voltage - Output12V
Current - Output8A
Voltage - input4 V ~ 36 V
Regulator topologyBoost, step down
Frequency - Switch-
Board typecompletely filled
What's includedplate
IC/parts usedLTC7812
DEMO MANUAL DC2422A-A,
DC2422A-B, DC2422A-C
LTC7812EUH
Wide V
IN
, Step-Up + Step-Down
DC/DC Converter
DESCRIPTION
Demonstration circuit DC2422A is a step-up + step-down
DC/DC converter featuring the
LTC
®
7812EUH,
a high per-
formance dual output (Boost + Buck) synchronous DC/
DC switching regulator controller. This board has three
different configurations:
n
n
DC2422A-A:
Regulated V
OUT
to 12V
DC2422A-B:
Quasi regulated V
OUT
between 10V and
16V
DC2422A-C:
Dual outputs: 12V (boost channel)
5V (buck channel)
The LTC7812 buck input is supplied from the boost output
for the DC2422A-A and DC2422A-B only. With this boost-
then-buck topology, the buck output maintains regulation
over the entire input range. The wide input voltage range
of 4V to 36V is suitable for automotive or other battery
fed applications where low quiescent current is important.
The DC2422A-B is designed such that V
OUT
is partially
regulated between 10V and 16V for higher efficiency
(Figure 4a), reduced power loss, and switching noise.
When V
IN
is between 10V and 16V, it operates in pass-
thru mode with the boost synchronous FET fully on and
the buck in drop-out with >99% duty cycle. When V
IN
is
below 10V, the boost is activated and when V
IN
is above
16V, the buck is activated as shown in Figure 4b.
The LT7812 data sheet gives a complete description of
the part, operation and application information and must
be read in conjunction with this quick start guide.
Design files for this circuit board are available at
http://www.linear.com/demo/DC2422A
L,
LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks
of Linear Technology Corporation. All other trademarks are the property of their respective
owners.
n
This circuit enables a drop-in layout where the total circuit
area is only 1½" by 1". The LTC7812EUH is in a 32-lead
exposed pad QFN package.
The main features of the board include rail tracking (buck
channel only), an internal 5V linear regulator for bias,
separate RUN pins for each output and a Mode selector
that allows the converter to run in CCM, pulse skip or
Burst Mode
®
operation. Synchronization to an external
clock is also possible.
PERFORMANCE SUMMARY
SYMBOL PARAMETER
V
IN
V
OUT1
Input Supply Range
Output1 Voltage Range
Specifications are at T
A
= 25°C
M
IN
4
11.7
9.7
4.9
11.7
5**
12
350
93
95.4
95
94.8
97.2
95.8
95.8
94
91.9
TYP
12
MAX
36
12.3
16.3
5.1
12.3
UNITS
V
V
V
V
V
kHz
%
%
%
%
%
%
%
%
%
dc2422af
CONDITIONS
DC2422A-A: V
IN
= 4V* – 36V, I
OUT1
= 0A to 8A
DC2422A-B: V
IN
= 4V* – 36V, I
OUT1
= 0A to 8A
DC2422A-C: V
IN
= 4V* – 36V, I
OUT1
= 0A to 8A
V
BUS
f
SW
V
BUS
Voltage Range (DC2422A-C only)
Typical Free Running Switching Frequency
Efficiency
See Figures 3, 4, 5 and 6 for Efficiency
Curves
DC2422A-A: V
IN
= 8V, V
OUT1
= 12V, I
OUT1
= 8A
V
IN
= 12V, V
OUT1
= 12V, I
OUT1
= 8A
V
IN
= 36V, V
OUT1
= 12V, I
OUT1
= 8A
DC2422A-B: V
IN
= 8V, V
OUT1
= 10V, I
OUT1
= 8A
V
IN
= 12V, V
OUT1
= 12V, I
OUT1
= 8A
V
IN
= 36V, V
OUT1
= 16V, I
OUT1
= 6A
DC2422A-C: V
IN
= 8V, V
BUS
= 12V, Ibus = 8A
V
IN
= 12V, V
OUT1
= 5V, I
OUT1
= 8A
V
IN
= 36V, V
OUT1
= 5V, I
OUT1
= 8A
I
OUT1
starts to derate when V
IN
< 8V, *V
IN
needs to be >4.5V to start up, **V
OUT1
follows V
IN
when V
IN
< 5V.
1

DC2422A-A Related Products

DC2422A-A DC2422A-C DC2422A-B
Description EVAL BOARD FOR LTC7812 EVAL BOARD FOR LTC7812 EVAL BOARD FOR LTC7812
The main purpose DC/DC, step up/step down DC/DC, step up/step down DC/DC, step up/step down
Output and type 1. Non-isolation 1. Non-isolation 1. Non-isolation
Voltage - Output 12V 5V 10 V ~ 16 V
Current - Output 8A 8A 8A
Voltage - input 4 V ~ 36 V 4 V ~ 36 V 4 V ~ 36 V
Regulator topology Boost, step down Boost, step down Boost, step down
Board type completely filled completely filled completely filled
What's included plate plate plate
IC/parts used LTC7812 LTC7812 LTC7812
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