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DC1926A

Description
board eval for ltc4353
CategoryDevelopment board/suite/development tools   
File Size125KB,6 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
Environmental Compliance  
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DC1926A Overview

board eval for ltc4353

DEMO MANUAL DC1926A
Dual Ideal Diode Controller
DESCRIPTION
Demonstration circuit 1926A features the LTC4353, a
dual low voltage ideal diode controller, in a typical 12A
application. The LTC4353 creates two near-ideal diodes
using external N-channel MOSFETs thereby replacing high
power Schottky diodes and their associated heat sinks.
Ideal diodes enable low loss power ORing and supply
holdup applications.
Design files for this circuit board are available at
http://www.linear.com/demo
L,
LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
PERFORMANCE SUMMARY
SYMBOL
V
IN
V
CC(EXT)
V
CC(REG)
V
CC(UVLO)
V
FR
ΔV
GATE
I
GATE
PARAMETER
V
IN1
and V
IN2
Input Voltage
Operating Range
V
CC
External Supply Operating Range
V
CC
Regulated Voltage
V
CC
Undervoltage Lockout Threshold
Forward Regulation Voltage (V
IN
– V
OUT
)
MOSFET Gate Drive (GATE-V
IN
)
GATE1, GATE2 Fast Pull-Up Current
GATE1, GATE2 Fast Pull-Down Current
GATE1, GATE2 Off Pull-Down Current
EN1, EN2
Threshold Voltage
MOSFET On-Detect Threshold (GATE-V
IN
)
Maximum Continuous Load Current for
Si4126DY
Specifications are at T
A
= 25°C
CONDITIONS
With External V
CC
Supply
V
IN1
, V
IN2
≤ V
CC
V
CC
Rising
V
IN
=1.2V, V
CC
= 5V
V
IN
=12V
V
FWD
= 0.2V; I = 0, –1μA; Highest V
IN
= 12V
V
FWD
= 0.2V; I = 0, –1μA; Highest V
IN
= 2.9V
V
FWD
= 0.4V, ΔV
GATE
= 0, CPO=17V
V
FWD
= –0.8V, ΔV
GATE
= 5V,
Corresponding
EN
= 1V, ΔV
GATE
= 2.5V
EN
Falling
ONST
Pulls Low
Limited by 0.6W power dissipation with
maximum voltage regulation 50mV
MIN
2.9
0
2.9
4.5
2.3
2
2
10
4.5
–0.9
0.9
65
580
0.28
5
2.55
12
25
12
7
–1.4
1.4
110
600
0.7
TYP
MAX
18
V
CC
6.0
5.5
2.7
25
50
14
9
–1.9
1.9
160
620
1.1
12
UNITS
V
V
V
V
mV
mV
V
V
A
A
μA
mV
V
A
V
EN(TH)
ΔV
GATE(ON)
I
OUT
OPERATING PRINCIPLES
The LTC4353 regulates the forward voltage drop across
the external MOSFETs to ensure smooth current transfer
in diode-OR applications. A fast turn-on reduces the load
voltage droop during supply switchover. If the input supply
fails or is shorted, a fast turn-off minimizes reverse cur-
rent transients. The controller operates with rail voltages
from 2.9V to 18V. Operation with rail voltages below 2.9V
requires an additional supply of 2.9V to 6.0V at the V
CC
pin.
The LTC4353 indicates the on state of each MOSFET with
the
ONST1
and
ONST2
pin signals, when the gate voltage
is at least 0.7V higher than V
IN
. Two enable pins (EN1,
EN2)
allow activating or blocking each MOSFET channel
individually.
Green LEDs ON1 and ON2 indicate the state of the as-
sociated MOSFET.
dc1926af
1

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