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LT1931 数据表(PDF) 3 Page - Linear Technology

部件名 LT1931
功能描述  1.2MHz/2.2MHz Inverting DC/DC Converters in ThinSOT
Download  12 Pages
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制造商  LINER [Linear Technology]
网页  http://www.linear.com
标志 LINER - Linear Technology

LT1931 数据表(HTML) 3 Page - Linear Technology

  LT1931 Datasheet HTML 1Page - Linear Technology LT1931 Datasheet HTML 2Page - Linear Technology LT1931 Datasheet HTML 3Page - Linear Technology LT1931 Datasheet HTML 4Page - Linear Technology LT1931 Datasheet HTML 5Page - Linear Technology LT1931 Datasheet HTML 6Page - Linear Technology LT1931 Datasheet HTML 7Page - Linear Technology LT1931 Datasheet HTML 8Page - Linear Technology LT1931 Datasheet HTML 9Page - Linear Technology Next Button
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3
LT1931/LT1931A
1931fa
TYPICAL PERFOR A CE CHARACTERISTICS
Quiescent Current
TEMPERATURE (
°C)
–50
4.5
5.0
5.5
25
75
1931 G01
4.0
3.5
3.0
–25
0
50
6.0
6.5
7.0
100
NOT SWITCHING
LT1931A
LT1931
TEMPERATURE (
°C)
–50
–1.28
–1.27
–1.26
–1.25
–1.24
–1.22
–25
025
50
1931 G02
75
100
–1.23
SHDN PIN VOLTAGE (V)
0
–10
10
30
50
1
2
34
1931 G03
5
70
90
0
20
40
60
80
6
LT1931A
TA = 25°C
LT1931
Feedback Pin Voltage
Shutdown Pin Current
Current Limit
Switch Saturation Voltage
Oscillator Frequency
DUTY CYCLE (%)
10
0.8
1.2
90
1931 G04
0.4
0
30
50
70
20
40
60
80
1.6
0.6
1.0
0.2
1.4
TA = 25°C
SWITCH CURRENT (A)
0
0
0.05
0.15
0.20
0.25
0.8
0.45
1931 G05
0.10
0.4
0.2
1.0
0.6
1.2
0.30
0.35
0.40
TA = 25°C
TEMPERATURE (
°C)
–50
0.5
0.9
1.3
1.7
–25
0
25
50
1931 G06
75
2.1
2.5
0.7
1.1
1.5
1.9
2.3
100
LT1931A
LT1931
PI FU CTIO S
SW (Pin 1): Switch Pin. Connect inductor/diode here.
Minimize trace area at this pin to keep EMI down.
GND (Pin 2): Ground. Tie directly to local ground plane.
NFB (Pin 3): Feedback Pin. Reference voltage is –1.255V.
Connect resistive divider tap here. Minimize trace area.
The NFB bias current flows out of the pin. Set R1 and R2
according to:
For LT
R
V
R
OUT
1931 1
1 255
1 255
2
410 6
:
|| – .
.
=
+
()
For LT
A R
V
R
OUT
1931
1
1 255
1 255
2
810 6
:
|| – .
.
=
+
()
SHDN (Pin 4): Shutdown Pin. Tie to 2.4V or more to enable
device. Ground to shut down.
VIN (Pin 5): Input Supply Pin. Must be locally bypassed.


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