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LT1317BCS8 Datasheet(PDF) 11 Page - Linear Technology

Part # LT1317BCS8
Description  Micropower, 600kHz PWM DC/DC Converters
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT1317BCS8 Datasheet(HTML) 11 Page - Linear Technology

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11
LT1317/LT1317B
APPLICATIONS INFORMATION
Single Li-Ion Cell to 3.3V SEPIC Converter
TYPICAL APPLICATIO S
LOW-BATTERY DETECTOR
The LT1317’s low-battery detector is a simple PNP input
gain stage with an open collector NPN output. The nega-
tive input of the gain stage is tied internally to a 200mV
±5% reference. The positive input is the LBI pin. Arrange-
ment as a low-battery detector is straightforward.
Figure 11 details hookup. R1 and R2 need only be low
enough in value so that the bias current of the LBI pin
doesn’t cause large errors. For R2, 100k is adequate. The
200mV reference can also be accessed as shown in
Figure 12. The low-battery detector remains active in
shutdown.
Figure 12. Accessing 200mV Reference
VIN
LT1317
LBI
LBO
200k
10
µF
GND
10k
1317 F12
2N3906
VREF
200mV
+
LBO
LBI
TO PROCESSOR
R1
1M
R2
100k
VIN
LT1317
1317 F11
3.3V
GND
200mV
INTERNAL
REFERENCE
–
+
R1 =
VLB – 200mV
2
µA
Figure 11. Setting Low-Battery Detector Trip Point
3.3V SEPIC Efficiency
VIN
SW
FB
LT1317
L1A*
C3
1
µF
L1B*
MBR0520
SHDN
33k
604k
1%
VOUT
3.3V
250mA
1M
1%
3300pF
1317 TA03
C1, C2: AVX TPSC476M010
C3: AVX 1206YC106KAT
* COILTRONICS CTX20-1
VC
GND
SINGLE
Li-ION
CELL
(2.7V TO
4.2V)
C1
47
µF
+
C2
47
µF
+
LOAD CURRENT (mA)
1
80
75
70
65
60
55
50
10
100
1000
1317 TA03a
VIN = 4.2V
VIN = 3.5V
VIN = 2.7V


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