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LT1173CS8 Datasheet(PDF) 11 Page - Linear Technology

Part # LT1173CS8
Description  Micropower DC/DC Converter Adjustable and Fixed 5V, 12V
PDF  16 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT1173CS8 Datasheet(HTML) 11 Page - Linear Technology

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LT1173
11
S
APPLICATI
I FOR ATIO
Using the Gain Block
The gain block (GB) on the LT1173 can be used as an error
amplifier, low battery detector or linear post regulator. The
gain block itself is a very simple PNP input op amp with an
open collector NPN output. The negative input of the gain
block is tied internally to the 1.245V reference. The posi-
tive input comes out on the SET pin.
Arrangement of the gain block as a low battery detector is
straightforward. Figure 12 shows hookup. R1 and R2 need
only be low enough in value so that the bias current of the
SET input does not cause large errors. 100k
Ω for R2 is
adequate. R3 can be added to introduce a small amount of
hysteresis. This will cause the gain block to “snap” when
the trip point is reached. Values in the 1M-10M range are
optimal. The addition of R3 will change the trip point,
however.
Table 1. Component Selection for Common Converters
INPUT
OUTPUT
OUTPUT
CIRCUIT
INDUCTOR
INDUCTOR
CAPACITOR
VOLTAGE
VOLTAGE
CURRENT (MIN)
FIGURE
VALUE
PART NUMBER
VALUE
NOTES
2.0-3.1
5
90mA
5
47
µH
G GA10-472K, C CTX50-1
100
µF*
2.0-3.1
5
10mA
5
220
µH
G GA10-223K, C CTX
22
µF
2.0-3.1
12
50mA
5
47
µH
G GA10-472K, C CTX50-1
47
µF*
2.0-3.1
12
10mA
5
150
µH
G GA10-153K
22
µF
5
12
90mA
5
120
µH
G GA10-123K
100
µF
5
12
30mA
5
150
µH
G GA10-153K
47
µF**
5
15
50mA
5
120
µH
G GA10-123K C CTX100-4
47
µF
5
30
25mA
5
100
µH
G GA10-103K, C CTX100-4
10
µF, 50V
6.5-9.5
5
50mA
6
47
µH
G GA10-472K, C CTX50-1
100
µF**
12-20
5
300mA
6
220
µH
G GA20-223K
220
µF**
20-30
5
300mA
6
470
µH
G GA20-473K
470
µF**
5
–5
75mA
7
100
µH
G GA10-103K, C CTX100-4
100
µF**
12
–5
250mA
7
470
µH
G GA40-473K
220
µF**
–5
5
150mA
8
100
µH
G GA10-103K, C CTX100-4
220
µF
–5
12
75mA
8
100
µH
G GA10-103K, C CTX100-4
47
µF
G = Gowanda
C = Coiltronics
* Add 68
Ω from ILIM to VIN
** Add 100
Ω from ILIM to VIN
LT1173 • TA16
VBAT
R1
R2
1.245V
REF
SET
GND
IN
V
LT1173
100k
+5V
TO
PROCESSOR
R1 =
VLB – 1.245V
11.7
µA
VLB
+
–
AO
R3
= BATTERY TRIP POINT
R2 = 100k
Ω
R3 = 4.7M
Ω
Figure 12. Setting Low Battery Detector Trip Point



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