LT1170 View Datasheet(PDF) - Linear Technology
Part Name
Description
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LT1170 Datasheet PDF : 20 Pages
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LT1170/LT1171/LT1172
TYPICAL PERFOR A CE CHARACTERISTICS
Line Regulation
5
4
3
TJ = 150°C
2
1
0 TJ = –55°C
–1
TJ = 25°C
–2
–3
–4
–5
0
10 20 30 40
INPUT VOLTAGE (V)
50 60
1170/1/2 G04
Supply Current vs Supply Voltage
(Shutdown Mode)
160
TJ = 25°C
140
120
100
80
VC = 50mV
60
40
20
0
0
VC = 0V
10 20 30 40
SUPPLY VOLTAGE (V)
50 60
1170/1/2 G07
Shutdown Mode Supply Current
200
180
160
140
120
TJ = 150°C
100
80
60
–55°C ≤ TJ ≤ 125°C
40
20
0
0 10 20 30 40 50 60 70 80 90 100
VC PIN VOLTAGE (mV)
1170/1/2 G10
Reference Voltage vs Temperature
1.250
1.248
1.246
1.244
1.242
1.240
1.238
1.236
1.234
–75 –50 –25 0 25 50 75 100 125 150
TEMPERATURE (°C)
1170/1/2 G05
Feedback Bias Current vs
Temperature
800
700
600
500
400
300
200
100
0
–75 –50 –25 0 25 50 75 100 125 150
TEMPERATURE (°C)
1170/1/2 G06
Driver Current* vs Switch Current
160
140
120
100
TJ = – 55°C
80
60
TJ = ≥ 25°C
40
20
0
0
1
2
3
4
5
SWITCH CURRENT (A)
1170/1/2 G08
* AVERAGE LT1170 POWER SUPPLY CURRENT IS
FOUND BY MULTIPLYING DRIVER CURRENT BY
DUTY CYCLE, THEN ADDING QUIESCENT CURRENT.
Supply Current vs Input Voltage*
15
14 TJ = 25°C
13 NOTE THAT THIS CURRENT DOES NOT
INCLUDE DRIVER CURRENT, WHICH IS
12 A FUNCTION OF LOAD CURRENT AND
DUTY CYCLE.
11
10
90% DUTY CYCLE
9
50% DUTY CYCLE
8
7
10% DUTY CYCLE
6
0% DUTY CYCLE
5
0 10 20 30 40 50 60
INPUT VOLTAGE (V)
1170/1/2 G09
* UNDER VERY LOW OUTPUT CURRENT CONDITIONS,
DUTY CYCLE FOR MOST CIRCUITS WILL APPROACH
10% OR LESS.
Error Amplifier Transconductance
5000
4500
4000
gm
=
∆I
∆V
(VC
(FB
PIN)
PIN)
3500
3000
2500
2000
1500
1000
500
0
–75 –50 –25 0 25 50 75 100 125 150
TEMPERATURE (°C)
1170/1/2 G11
VC Pin Characteristics
300
200 VFB = 1.5V (CURRENT INTO VC PIN)
100
0
–100
TJ = 25°C
–200
–300
VFB = 0.8V (CURRENT OUT OF VC PIN)
–400
0
0.5 1.0 1.5 2.0 2.5
VC PIN VOLTAGE (V)
1170/1/2 G12
5
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