LT1172CSW Linear Technology, LT1172CSW Datasheet - Page 6

• Manufacturer Part Number: LT1172CSW
• Description: IC SWTCHNG REG HI-EFF 16-SOIC
• Manufacturer: Linear Technology
• Type: Step-Down (Buck), Step-Up (Boost), Inverting, Cuk, Flyback, Forward Converterr

Specifications of LT1172CSW

• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: 1.25 ~ 40 V
• Current - Output: 1.25A
• Frequency - Switching: 100kHz
• Voltage - Input: 3 ~ 40 V
• Operating Temperature: 0°C ~ 100°C
• Mounting Type: Surface Mount
• Package / Case: 16-SOIC (0.300", 7.5mm Width)
• Power - Output: 100W
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

LT1170/LT1171/LT1172
TYPICAL PERFORMANCE CHARACTERISTICS
6
160
140
120
100
80
60
40
20
16
12
–1
–2
–3
–4
–5
8
4
0
0
5
4
3
2
1
0
0
0
Switch Current Limit vs Duty Cycle*
Line Regulation
0
Supply Current vs Supply Voltage
(Shutdown Mode)
* DIVIDE VERTICAL SCALE BY TWO FOR
T
10
T
J
LT1171, BY FOUR FOR LT1172.
J
= 25°C
= –55°C
10
10
20 30
–55°C
125°C
SUPPLY VOLTAGE (V)
INPUT VOLTAGE (V)
20
DUTY CYCLE (%)
20
40
V
C
V
C
= 50mV
50 60 70 80 90 100
30
30
= 0V
25°C
40
40
T
J
T
= 150°C
J
= 25°C
50
50
1170/1/2 G07
1170/1/2 G01
1170/1/2 G04
60
60
1.250
1.248
1.246
1.244
1.242
1.240
1.238
1.236
1.234
160
140
120
100
* AVERAGE LT1170 POWER SUPPLY CURRENT IS
2.9
2.8
2.7
2.6
2.5
2.4
2.3
80
60
40
20
FOUND BY MULTIPLYING DRIVER CURRENT BY
DUTY CYCLE, THEN ADDING QUIESCENT CURRENT.
0
–75
–75
0
Minimum Input Voltage
Reference Voltage vs Temperature
Driver Current* vs Switch Current
–50
–50
SWITCH CURRENT = 0A
–25
–25
1
SWITCH CURRENT (A)
TEMPERATURE (°C)
TEMPERATURE (°C)
SWITCH CURRENT = I
0
0
2
25
25
T
J
= –55°C
50
50
3
75 100 125
75 100 125
T
J
= ≥ 25°C
MAX
4
1170/1/2 G05
1170/1/2 G02
1170/1/2 G08
150
150
5
* UNDER VERY LOW OUTPUT CURRENT CONDITIONS,
800
700
600
500
400
300
200
100
DUTY CYCLE FOR MOST CIRCUITS WILL APPROACH
10% OR LESS.
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
15
14
13
12
11
10
0
0
9
8
7
6
5
–75
0
Feedback Bias Current
vs Temperature
0
Switch Saturation Voltage
Supply Current vs Input Voltage*
T
NOTE THAT THIS CURRENT DOES NOT
INCLUDE DRIVER CURRENT, WHICH IS
A FUNCTION OF LOAD CURRENT AND
DUTY CYCLE.
–50
J
1
= 25°C
10
–25
* DIVIDE CURRENT BY TWO FOR
2
SWITCH CURRENT (A)*
LT1171, BY FOUR FOR LT1172.
TEMPERATURE (°C)
INPUT VOLTAGE (V)
20
0
3
25
4
30
50
90% DUTY CYCLE
10% DUTY CYCLE
50% DUTY CYCLE
0% DUTY CYCLE
5
100°C
75 100 125
40
6
150°C
–55°C
50
1170/1/2 G06
1170/1/2 G03
25°C
7
117012fg
1170/1/2 G09
150
8
60