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LTC1514CS8-3.3#PBF

P1-P3P4-P6P7-P8
7
LTC1514-3.3/LTC1514-5
APPLICATIONS INFORMATION
WUU
U
resistor divider (see Figure 2). Since the low-battery
comparator is kept alive in shutdown, it may be used to
protect batteries against deep discharge by shutting
down the power supply when the battery voltage gets too
low. The open-drain comparator output allows for flex-
ible interfacing between the LBO output and external
logic. LBO pull-up resistors in the 50k to 1M range are
recommended.
TYPICAL APPLICATIONS N
U
3.3V Step-Up/Step-Down Supply with Power Good Output
1
2
3
4
8
7
6
5
SHDN
LBO
LBI
GND
V
OUT
V
IN
C1
+
C1
–
LTC1514-3.3
V
OUT
=
3.3V ±4%
I
OUT
=
15mA, V
IN
> 2V
I
OUT
=
50mA, V
IN
> 3V
V
IN
2V TO 8V
0.22µF
499k
1%
10µF
10µF
806k
1%
100k
1514 TA05
ON OFF
POWER GOOD
3V V
TRIP
+
+
Low Power Battery Backup Supply with Autoswitchover and No Reverse Current
1
2
3
4
8
7
6
5
SHDN
LBO
LBI
GND
V
OUT
V
IN
C1
+
C1
–
LTC1514-5
5V BACKUP SUPPLY
I
OUT
= 15mA
0.1µF
499k
MAIN
5V SUPPLY
10µF
10µF
3-CELL 
NiCd BATTERY
TRICKLE CHARGE
AND LTC1514 I
DD
499k
1%
1.5M
1%
499k
1514 TA03
4.6V V
TRIP
TP0610T
+
+
BACKED-UP
CIRCUITRY
BAT54
1
2
3
4
8
7
6
5
SHDN
LBO
LBI
GND
V
OUT
V
IN
C1
+
C1
–
LTC1514-5
MBR0520L
0.22µF
CHARGE PATH
499k
1%
3-CELL
NiCd
BATTERY
499k
1M
1%
6V
WALL
ADAPTER
INPUT
1514 TA06
EXTERNAL 
POWER GOOD
5V
ON OFF
10µF
+
22µF
+
Battery/External Power Autoswitch Regulator
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
8
LTC1514-3.3/LTC1514-5
151435f LT/TP 0298 4K • PRINTED IN USA
LINEAR TECHNOLOGY CORPORATION 1997
TYPICAL APPLICATIONS N
U
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
●
(408) 432-1900
FAX: (408) 434-0507
●
TELEX: 499-3977
●
www.linear-tech.com
PART NUMBER DESCRIPTION COMMENTS
LTC1515 Series Step-Up/Step-Down Switched Capacitor DC/DC Converters with Reset V
IN
2V to 10V, 3.3V, 5V and ADJ Versions, I
OUT
to 50mA
LTC1516 Micropower, Regulated 5V Charge Pump DC/DC Converter I
OUT
= 20mA (V
IN
≥ 2V), I
OUT
= 50mA (V
IN
≥ 3V)
LTC1517-5 Micropower, Regulated 5V Charge Pump DC/DC Converter LTC1522 Without Shutdown and Packaged in SOT-23
LTC1522 Micropower, Regulated 5V Charge Pump DC/DC Converter Available in 8-Pin MSOP, 6µA Quiescent Current, I
OUT
= 20mA
LTC1555/LTC1556 SIM Power Supply and Level Translators Step-Up/Step-Down SIM Power Supply and Level Translators
LTC660 100mA CMOS Voltage Converter 5V to –5V Conversion with Low Voltage Loss
RELATED PARTS
1
2
3
4
0.150 – 0.157**
(3.810 – 3.988)
8
7
6
5
0.189 – 0.197*
(4.801 – 5.004)
0.228 – 0.244
(5.791 – 6.197)
0.016 – 0.050
0.406 – 1.270
0.010 – 0.020
(0.254 – 0.508)
× 45°
0°– 8° TYP
0.008 – 0.010
(0.203 – 0.254)
SO8 0996
0.053 – 0.069
(1.346 – 1.752)
0.014 – 0.019
(0.355 – 0.483)
0.004 – 0.010
(0.101 – 0.254)
0.050
(1.270)
TYP
DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH 
SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD 
FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
*
**
Low Power Dual Output Supply (Maximum Combined I
OUT
= 50mA)
1514 TA04
1
ON OFF
2
3
V
OUT
3.3V 
±4%
V
OUT
5V ±4%
V
IN
2.7V TO 10V
4
8
7
47k
220k
10Ω
750k
1%
402k
1%
2.2nF
Q1: TP0610T
Q2: MMBT3906LT1
Q2
Q1
6
5
0.22µF
10µF
22µF10µF
+
++
SHDN
LBO
LBI
GND
V
OUT
V
IN
C1
+
C1
–
LTC1514-5
Step-Up/Step-Down Power Supply with Input Autoswitching
S8 Package
8-Lead Plastic Small Outline (Narrow 0.150)
(LTC DWG # 05-08-1610)
Dimensions in inches (millimeters) unless otherwise noted.
PACKAGE DESCRIPTION
U
1
3
2
7
4
8
6
5
SHDN
LBI
LBO
V
OUT
C1
+
C1
–
LTC1514-5
0.22µF
10k
MMBT
3904LT1
MMBT
3904LT1
2N7002
22µF
10V
4 × AAA
ALKALINE
CELLS
10k
470k
CENTRAL SEMI
CMPD6263C
1M
1514 TA07
+
10µF
25V
+
EXT_PWR_GOOD
V
OUT
5V
50mA
V
IN
GND
ON OFF
100k
2.4k
Si6943DQ
Si6943DQ
Si6943DQ
1k
MMBD
914LT1
MMBZ
5235BLT1
(6.8V)
+6VDC
WALL
ADAPTER
P1-P3P4-P6P7-P8

LTC1514CS8-3.3#PBF

Mfr. #:
Buy LTC1514CS8-3.3#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators Boost/Buck Switched Cap DC/DC Convs w/ L
Lifecycle:
New from this manufacturer.
Delivery:
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