LT1959IS8 Linear Technology, LT1959IS8 Datasheet - Page 4
LT1959IS8
Manufacturer Part Number
LT1959IS8
Description
IC REG SW 4.5A 500KHZ STDN 8SOIC
Manufacturer
Linear Technology
Type
Step-Down (Buck)r
Datasheet
1.LT1959CS8PBF.pdf
(24 pages)
Specifications of LT1959IS8
Internal Switch(s)
Yes
Synchronous Rectifier
No
Number Of Outputs
1
Voltage - Output
1.21 ~ 38 V
Current - Output
4.5A
Frequency - Switching
500kHz
Voltage - Input
4.3 ~ 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
-
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
LT1959IS8
Manufacturer:
LINEAR/凌特
Quantity:
20 000
Company:
Part Number:
LT1959IS8#TRPBF
Manufacturer:
LINEAR
Quantity:
5 956
LT1959
TYPICAL PERFORMANCE CHARACTERISTICS
4
– 400
– 300
– 200
–500
4.7
4.5
4.3
4.1
3.9
3.7
3.5
3.3
– 8
– 4
70
60
50
40
30
20
10
0
0
–50
0
1
Shutdown Supply Current
Minimum Input Voltage
with 3.3V Output
Shutdown Pin Bias Current
V
IN
–25
= 10V
AT 0.37V SHUTDOWN THRESHOLD.
AT 2.38V LOCKOUT THRESHOLD
AFTER SHUTDOWN, CURRENT
0.1
SHUTDOWN VOLTAGE (V)
LOAD CURRENT (mA)
DROPS TO A FEW A
0
TEMPERATURE ( C)
10
25
0.2
50
100
75
0.3
W
100
1959 G01
1959 G04
1959 G07
1000
U
125
0.4
2500
2000
1500
1000
500
2.40
2.36
2.32
0
0.8
0.4
6.5
6.0
5.5
5.0
4.5
4.0
3.5
3.0
–50
0
Error Amplifier Transconductance
–50
0
Switch Peak Current Limit
Lockout and Shutdown
Thresholds
–25
–25
JUNCTION TEMPERATURE ( C)
20
JUNCTION TEMPERATURE ( C)
0
0
MINIMUM
DUTY CYCLE (%)
SHUTDOWN
25
40
25
START-UP
50
50
LOCKOUT
60
75
75
TYPICAL
100
80
100
1959 G08
1959 G05
1959 G02
125
125
100
3000
2500
2000
1500
1000
500
100
1.215
1.210
1.205
Error Amplifier Transconductance
25
20
15
10
ERROR AMPLIFIER EQUIVALENT CIRCUIT
V
R
5
0
– 50
FB 2 10
LOAD
0
Feedback Pin Voltage
Shutdown Supply Current
V
1k
SHDN
= 50
–25
–3
GAIN
= 0V
FREQUENCY (Hz)
PHASE
10k
0
INPUT VOLTAGE (V)
TEMPERATURE ( C)
5
25
R
200k
OUT
100k
50
10
1M
C
12pF
75
OUT
V
1959 G09
C
100
10M
1959 G03
1959 G06
200
150
100
50
0
–50
125
15