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LT1577CS-3.3/2.8 Datasheet(PDF) 3 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) 3 Page - Linear Technology

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LT1575/LT1577
ELECTRICAL CHARACTERISTICS
TA = 25°C, VIN = 12V, GATE = 6V, IPOS = INEG = 5V, SHDN = 0.75V unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
IQ
Supply Current
q
512
19
mA
VFB
LT1575 Reference Voltage
– 0.6
1.210
0.6
%
q
– 1.0
1.210
1.0
%
VOUT
LT1575-1.5 Output Voltage
– 0.6
1.500
0.6
%
q
– 1.0
1.500
1.0
%
LT1575-2.8 Output Voltage
– 0.6
2.800
0.6
%
q
– 1.0
2.800
1.0
%
LT1575-3.3 Output Voltage
– 0.6
3.300
0.6
%
q
– 1.0
3.300
1.0
%
LT1575-3.5 Output Voltage
– 0.6
3.500
0.6
%
q
– 1.0
3.500
1.0
%
LT1575-5 Output Voltage
– 0.6
5.000
0.6
%
q
– 1.0
5.000
1.0
%
Line Regulation
10V
≤ VIN ≤ 20V
q
0.01
0.03
%/V
IFB
FB Input Bias Current
FB = VFB
q
– 0.6
– 4.0
µA
IOUT
OUT Divider Current
OUT = VOUT
q
0.5
1.0
1.5
mA
AVOL
LT1575 Large-Signal Voltage Gain
VGATE = 3V to 10V
q
69
84
dB
LT1575-1.5 Large-Signal Voltage Gain
VGATE = 3V to 10V
q
67
82
dB
LT1575-2.8 Large-Signal Voltage Gain
VGATE = 3V to 10V
q
60
76
dB
LT1575-3.3 Large-Signal Voltage Gain
VGATE = 3V to 10V
q
60
75
dB
LT1575-3.5 Large-Signal Voltage Gain
VGATE = 3V to 10V
q
60
74
dB
LT1575-5 Large-Signal Voltage Gain
VGATE = 3V to 10V
q
56
71
dB
VOL
GATE Output Swing Low (Note 3)
IGATE = 0mA
q
2.5
3.0
V
VOH
GATE Output Swing High
IGATE = 0mA
q
VIN – 1.6
VIN – 1
V
IPOS + INEG Supply Current
3V
≤ IPOS ≤ 20V
q
0.3
0.625
1.0
mA
Current Limit Threshold Voltage
42
50
58
mV
q
37
50
63
mV
Current Limit Threshold Voltage
3V
≤ IPOS ≤ 20V
q
– 0.20
– 0.50
%/V
Line Regulation
SHDN Sink Current
Current Flows Into Pin
q
2.5
5.0
8.0
µA
SHDN Source Current
Current Flows Out of Pin
q
–8
– 15
– 23
µA
SHDN Low Clamp Voltage
q
0.1
0.25
V
SHDN High Clamp Voltage
q
1.50
1.85
2.20
V
SHDN Threshold Voltage
q
1.18
1.21
1.240
V
SHDN Threshold Hysteresis
q
50
100
150
mV
The q denotes specifications which apply over the full operating
temperature range.
Note 1: Absolute Maximum Ratings are those values beyond which the life
of the device may be impaired.
Note 2: TJ is calculated from the ambient temperature TA and power
dissipation PD according to the following formulas:
LT1575CN8: TJ = TA + (PD • 100°CW)
LT1575CS8: TJ = TA + (PD • 130°CW)
LT1577CS: TJ = TA + (PD • 100°CW)
Because the LT1577 consists of two regulators in the package, the total
LT1577 power dissipation must be used for its junction temperature
calculation. The total LT1577 PD = PD (Regulator 1) + PD (Regulator 2).
Note 3: The VGS(th) of the external MOSFET must be greater than
3V – VOUT.



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