LT1578IS8 Linear Technology, LT1578IS8 Datasheet - Page 4

• Manufacturer Part Number: LT1578IS8
• Description: IC BUCK SYNC ADJ 1.5A 8SOIC
• Manufacturer: Linear Technology
• Type: Step-Down (Buck)r

Specifications of LT1578IS8

• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: Adj to 1.21V
• Current - Output: 1.5A
• Frequency - Switching: 200kHz
• Voltage - Input: 4 ~ 15 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Power - Output: -

LT1578/LT1578-2.5
TYPICAL PERFORMANCE CHARACTERISTICS
4
–500
2000
1500
1000
2.46
2.45
2.44
2.43
2.42
2.41
2.40
500
0
4
3
2
1
0
–50
–50
10
Error Amplifier Transconductance
Shutdown Pin Bias Current
(V
Standby Thresholds
ERROR AMPLIFIER EQUIVALENT CIRCUIT
V
R
AT 2.44V STANDBY THRESHOLD
(CURRENT FLOWS OUT OF PIN)
FB 1 10
SHDN
LOAD
–25
–25
100
JUNCTION TEMPERATURE ( C)
JUNCTION TEMPERATURE ( C)
= 50
= Lockout Threshold)
–3
GAIN
0
0
FREQUENCY (Hz)
PHASE
1k
STANDBY
25
25
ON
R
570k
50
50
OUT
10k
75
75
W
100k
C
2.4pF
OUT
100
100
V
1576 G09
C
1576 G04
1576 G07
U
1M
125
125
200
150
100
50
0
–50
180
160
140
120
100
25
20
15
10
80
60
40
20
1600
1400
1200
1000
5
0
0
800
600
400
200
–50
0
Shutdown Supply Current
Shutdown Pin Bias Current
(V
0
–50
CURRENT REQUIRED TO FORCE
SHUTDOWN (FLOWS OUT OF PIN).
AFTER SHUTDOWN, CURRENT
DROPS TO A FEW A
Error Amplifier Transconductance
SHDN
–25
–25
JUNCTION TEMPERATURE ( C)
= Shutdown Threshold)
JUNCTION TEMPERATURE ( C)
0
INPUT VOLTAGE (V)
5
0
25
25
50
50
10
75
V
SHDN
75
100
= 0V
1576 G08
100
1576 G05
1576 G11
125
15
125
250
200
150
100
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
50
30
25
20
15
10
0
0
5
0
–50
0
0
Shutdown Thresholds
Shutdown Supply Current
Frequency Foldback
–25
JUNCTION TEMPERATURE ( C)
0.1
0.5
SHUTDOWN VOLTAGE (V)
SHUTDOWN
FEEDBACK VOLTAGE (V)
0
25
SWITCHING FREQUENCY
FEEDBACK PIN CURRENT
1.0
0.2
V
50
IN
START-UP
= 10V
75
0.3
1.5
100
1576 G010
1576 G12
1576 G06
125
0.4
2.0