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LT1578CS8-2.5 Datasheet(PDF) 2 Page - Linear Technology

Part # LT1578CS8-2.5
Description  1.5A, 200kHz Step-Down Switching Regulator
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT1578CS8-2.5 Datasheet(HTML) 2 Page - Linear Technology

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LT1578/LT1578-2.5
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Feedback Voltage
1.195
1.21
1.225
V
All Conditions
q
1.18
1.24
V
Sense Voltage (Fixed 2.5)
2.46
2.5
2.54
V
All Conditions
q
2.44
2.56
V
Sense Pin Resistance
5.7
9.5
13.7
k
Reference Voltage Line Regulation
4.3V
≤ VIN ≤ 15V
q
0.01
0.03
%/V
Feedback Input Bias Current
q
0.5
2
µA
Error Amplifier Voltage Gain (Notes 2, 10)
200
400
Error Amplifier Transconductance (Note 10)
∆I (VC) = ±10µA
800
1050
1300
µMho
q
400
1700
µMho
VC Pin to Switch Current Transconductance
1.5
A/ V
Error Amplifier Source Current
VFB = 1.1V
q
40
110
190
µA
Error Amplifier Sink Current
VFB = 1.4V
q
50
130
200
µA
VC Pin Switching Threshold
Duty Cycle = 0
0.8
V
VC Pin High Clamp
2.1
V
Switch Current Limit
VC Open, VFB = 1.1V, DC ≤ 50%
q
1.5
2
3.5
A
Slope Compensation (Note 8)
DC = 80%
0.3
A
Switch On Resistance (Note 7)
ISW = 1.5A
0.2
0.35
q
0.45
Maximum Switch Duty Cycle
VFB = 1.1V
90
94
%
q
86
94
%
Minimum Switch Duty Cycle (Note 9)
8%
Switch Frequency
VC Set to Give 50% Duty Cycle
180
200
220
kHz
q
160
240
kHz
Switch Frequency Line Regulation
4.3V
≤ VIN ≤ 15V
q
0
0.15
%/ V
Frequency Shifting Threshold on FB Pin
∆f = 10kHz
q
0.4
0.74
1.0
V
Minimum Input Voltage (Note 3)
q
4.0
4.3
V
Minimum Boost Voltage (Note 4)
ISW ≤ 1.5A
q
2.3
3.0
V
ABSOLUTE MAXIMUM RATINGS
PACKAGE/ORDER INFORMATION
(Note 1)
Input Voltage .......................................................... 16V
BOOST Pin Above Input Voltage ............................. 10V
SHDN Pin Voltage ..................................................... 7V
SENSE Pin Voltage .................................................... 4V
FB Pin Voltage (Adjustable Part) ............................ 3.5V
FB Pin Current (Adjustable Part) ............................ 1mA
SYNC Pin Voltage ..................................................... 7V
Operating Junction Temperature Range
LT1578C ............................................... 0
°C to 125° C
LT1578I ........................................... – 40
°C to 125°C
Storage Temperature Range ................ – 65
°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300
°C
The q denotes specifications which apply over the full operating tempera-
ture range, otherwise specifications are at TJ = 25°C. VIN = 5V, VC = 1.5V, Boost = VIN + 5V, switch open, unless otherwise noted.
ELECTRICAL CHARACTERISTICS
Consult factory for Military grade parts.
ORDER PART
NUMBER
LT1578CS8
LT1578IS8
LT1578CS8-2.5
LT1578IS8-2.5
S8 PART MARKING
1578
1578I
1
2
3
4
8
7
6
5
TOP VIEW
S8 PACKAGE
8-LEAD PLASTIC SO
VSW
VIN
BOOST
GND
SHDN
FB/SENSE
VC
SYNC
θJA =80°C/ W WITH FUSED GROUND PIN
CONNECTED TO GROUND PLANE OR
LARGE LANDS
157825
578I25


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