LT1578 데이터 시트보기 (PDF) - Linear Technology
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LT1578 Datasheet PDF : 28 Pages
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LT1578/LT1578-2.5
ABSOLUTE MAXIMUM RATINGS
(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
PACKAGE/ORDER INFORMATION
TOP VIEW
VSW 1
VIN 2
BOOST 3
GND 4
8 SYNC
7 SHDN
6 FB/SENSE
5 VC
S8 PACKAGE
8-LEAD PLASTIC SO
θJA = 80°C/ W WITH FUSED GROUND PIN
CONNECTED TO GROUND PLANE OR
LARGE LANDS
Consult factory for Military grade parts.
ORDER PART
NUMBER
LT1578CS8
LT1578IS8
LT1578CS8-2.5
LT1578IS8-2.5
S8 PART MARKING
1578 157825
1578I 578I25
ELECTRICAL CHARACTERISTICS 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.
PARAMETER
Feedback Voltage
Sense Voltage (Fixed 2.5)
Sense Pin Resistance
Reference Voltage Line Regulation
Feedback Input Bias Current
Error Amplifier Voltage Gain (Notes 2, 10)
Error Amplifier Transconductance (Note 10)
CONDITIONS
All Conditions
All Conditions
4.3V ≤ VIN ≤ 15V
∆I (VC) = ±10µA
VC Pin to Switch Current Transconductance
Error Amplifier Source Current
Error Amplifier Sink Current
VC Pin Switching Threshold
VC Pin High Clamp
Switch Current Limit
Slope Compensation (Note 8)
Switch On Resistance (Note 7)
VFB = 1.1V
VFB = 1.4V
Duty Cycle = 0
VC Open, VFB = 1.1V, DC ≤ 50%
DC = 80%
ISW = 1.5A
Maximum Switch Duty Cycle
VFB = 1.1V
Minimum Switch Duty Cycle (Note 9)
Switch Frequency
VC Set to Give 50% Duty Cycle
Switch Frequency Line Regulation
Frequency Shifting Threshold on FB Pin
Minimum Input Voltage (Note 3)
Minimum Boost Voltage (Note 4)
4.3V ≤ VIN ≤ 15V
∆f = 10kHz
ISW ≤ 1.5A
MIN TYP MAX
1.195 1.21 1.225
q 1.18
1.24
2.46 2.5 2.54
q 2.44
2.56
5.7 9.5 13.7
q
0.01 0.03
q
0.5 2
200 400
800 1050 1300
q 400
1700
1.5
q 40 110 190
q 50 130 200
0.8
2.1
q 1.5
2
3.5
0.3
0.2 0.35
q
0.45
90 94
q 86 94
8
180 200 220
q 160
240
q
0 0.15
q 0.4 0.74 1.0
q
4.0 4.3
q
2.3 3.0
UNITS
V
V
V
V
kΩ
%/V
µA
µMho
µMho
A/ V
µA
µA
V
V
A
A
Ω
Ω
%
%
%
kHz
kHz
%/ V
V
V
V
2
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