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LT1577CS-3.3/2.8 Datasheet(PDF) 14 Page - Linear Technology

Part # LT1577CS-3.3/2.8
Description  Ultrafast Transient Response, Low Dropout Regulators Adjustable and Fixed
PDF  20 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT1577CS-3.3/2.8 Datasheet(HTML) 14 Page - Linear Technology

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LT1575/LT1577
TYPICAL APPLICATIONS N
Setting Output Voltage with the Adjustable LT1575
FB
1575 TA03
R2
VOUT = 1.21V(1 + R2/R1)
VOUT
R1
Using “Sense-Less” Current Limit
C1
10
µF
CT
R3
10
Ω
IPOS
SHDN
VCC
1575 TA04
VOUT
Q1
INEG
GATE
Shutdown Time-Out with Reset
Overvoltage Protection
R3
100k
R2
100k
C2*
1575 TA09
*C2 = 15
µA(t)/1.11V
t = SHUTDOWN LATCH-OFF TIME
SHDN
Q2
2N3904
RESET
0V TO 5V
SHDN
1575 TA10
VOUT
R5
R6
VOUT(uth) = 1.21(R6/R5) + 5µA(R6)
VOUT(lth) = 1.11(R6/R5) – 15µA(R6)
Shutdown Time-Out with Reset
Basic Thermal Shutdown
R1
100k
C1*
1575 TA07
*C1 = 15
µA(t)/1.11V
t = SHUTDOWN LATCHOFF TIME
SHDN
Q1
VN2222L
RESET
0V TO 5V
SHDN
1575 TA08
RT1
10k
NTC
5V
R4
549
Ω
RT1 = DALE NTHS-1206N02
THERMALLY MOUNT RT1
IN CLOSE PROXIMITY
TO THE EXTERNAL
N-CHANNEL MOSFET
Setting Current Limit
IPOS
VCC
RSENSE*
*ILIM = 50mV/RSENSE
RSENSE = DISCRETE SHUNT RESISTOR OR
RSENSE = KELVIN-SENSED PC BOARD TRACE
ACTIVATING CURRENT LIMIT ALSO ACTIVATES
THE SHDN PIN TIMER
1575 TA05
VOUT
Q2
INEG
GATE
Setting Current Limit with Foldback Limiting
IPOS
VCC
R4
D1
1N4148
D2
1N4148
R5
10
Ω
1575 TA06
VOUT
Q3
INEG
GATE
R6
1.2k



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