參數(shù)資料
型號(hào): LT1173CS8-5
廠商: LINEAR TECHNOLOGY CORP
元件分類: 穩(wěn)壓器
英文描述: Micropower DC/DC Converter Adjustable and Fixed 5V, 12V
中文描述: 1.5 A SWITCHING REGULATOR, 23 kHz SWITCHING FREQ-MAX, PDSO8
封裝: PLASTIC, SOIC-8
文件頁(yè)數(shù): 4/16頁(yè)
文件大小: 322K
代理商: LT1173CS8-5
LT1173
4
C
HARA TERISTICS
Supply Current vs Switch Current
50
U
A
TYPICAL PERFOR
Quiescent Current vs Temperature
120
CE
LT1173 BD02
IN
V
GND
SET
AO
A2
1.245V
REFERENCE
A1
OSCILLATOR
DRIVER
R1
SW1
SW2
LIM
I
R2
753k
SENSE
LT1173-5:
LT1173-12:
R1 = 250k
R1 = 87.4k
GAIN BLOCK/
ERROR AMP
COMPARATOR
LT1173 BD01
IN
V
GND
SET
AO
1.245V
REFERENCE
A1
A2
DRIVER
FB
SW1
SW2
LIM
I
OSCILLATOR
GAIN BLOCK/
ERROR AMP
COMPARATOR
LT1173
LT1173-5, -12
W
IAGRA
BLOCK
S
I
LIM
(Pin 1):
Connect this pin to V
IN
for normal use. Where
lower current limit is desired, connect a resistor between
I
LIM
and V
IN
. A 220
resistor will limit the switch current
to approximately 400mA.
V
IN
(Pin 2):
Input supply voltage.
SW1 (Pin 3):
Collector of power transistor. For step-up
mode connect to inductor/diode. For step-down mode
connect to V
IN
.
SW2 (Pin 4):
Emitter of power transistor. For step-up
mode connect to ground. For step-down mode connect to
inductor/diode. This pin must never be allowed to go more
than a Schottky diode drop below ground.
GND (Pin 5):
Ground.
AO (Pin 6):
Auxiliary Gain Block (GB) output. Open collec-
tor, can sink 100
μ
A.
SET (Pin 7):
GB input. GB is an op amp with positive input
connected to SET pin and negative input connected to
1.245V reference.
FB/SENSE (Pin 8):
On the LT1173 (adjustable) this pin
goes to the comparator input. On the LT1173-5 and
LT1173-12, this pin goes to the internal application resis-
tor that sets output voltage.
PIU
FU
U
C
U
S
O
TI
Oscillator Frequency
SWITCH CURRENT (mA)
0
S
30
40
400
600
800
LT1173 TPC07
1000
V = 5V
20
10
0
V = 2V
200
TEMPERATURE (°C)
–50
I
100
110
–25
0
25
50
LT1173 TPC06
75
100
125
V = 3V
I
μ
90
V
IN
(V)
0
22.0
F
O
22.5
23.0
23.5
24.5
25.0
5
10
15
20
LT1173 TPC08
24.0
25
30
25.5
26.0
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