LT1109ACN8-12 Linear Technology, LT1109ACN8-12 Datasheet

IC DC/DC CONV FIXED OUT 12V 8DIP

LT1109ACN8-12

Manufacturer Part Number
LT1109ACN8-12
Description
IC DC/DC CONV FIXED OUT 12V 8DIP
Manufacturer
Linear Technology
Type
Step-Up (Boost)r
Datasheet

Specifications of LT1109ACN8-12

Internal Switch(s)
Yes
Synchronous Rectifier
No
Number Of Outputs
1
Voltage - Output
12V
Current - Output
150mA
Frequency - Switching
120kHz
Voltage - Input
2 ~ 9 V
Operating Temperature
0°C ~ 70°C
Mounting Type
Through Hole
Package / Case
8-DIP (0.300", 7.62mm)
Power - Output
300mW
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant

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FEATURE
A
TYPICAL
+V
22 F
5V
IN
10V
**
PPLICATI
C1
Uses Off-the-Shelf Inductors
Low Cost
8-Pin DIP or SO Package
Fixed 5V or 12V Output or Adjustable Version
Only Four External Components Required
360 A Standby Current
Logic-Controlled Shutdown
Flash Memory VPP Generators
5V to 12V Converters
3.3V to 12V Converters
Disk Drives
PC Plug-In Cards
Peripherals
Battery-Powered Equipment
*
Flash Memory VPP Generator
COILTRONICS CTX33-2
SUMIDA CD54-330LC
1 = PROGRAM
0 = SHUTDOWN
+
**
All Surface Mount
1
7
33 H
L1*
SHUTDOWN
V
LT1109ACS8-12
PGND
IN
A
S
4
PPLICATI
SW
O
3
MBRS130T3
SENSE
GND
U
5
S
8
+
1109A TA01
C2
47 F
20V
V
12V
O
OUT
U
13.0
12.5
12.0
11.5
11.0
10.5
10.0
0
50
OUTPUT CURRENT (mA)
Output Current
100
Flash Memory VPP Generator
Adjustable and Fixed 5V, 12V
V
IN
150
= 4.5V
D
The LT1109A is a simple step-up DC/DC converter. The 8-
pin DIP or SOIC devices require only four external compo-
nents to construct a complete DC/DC converter. Current
drain is just 360 A at no load, making the device ideal for
cost-sensitive applications where standby current must
be kept to a minimum.
The LT1109A-12 can deliver 12V at over 150mA from a 5V
supply, enough power to program four flash memory
chips simultaneously. The LT1109A-5 can deliver 5V at up
to 110mA from a 2V input. The devices feature a shutdown
pin that turns off the oscillator when taken low. The gated-
oscillator design requires no frequency compensation
components. High frequency 120kHz operation permits
the use of small surface mount inductors and capacitors.
ESCRIPTIO
200
V
250
IN
1109A TA02
= 5V
300
SHUTDOWN
DC/DC Converter
U
2V/DIV
5V/DIV
V
12V
OUT
Micropower
Output Voltage
500 s/DIV
LT1109A
1109A TA03
1

Related parts for LT1109ACN8-12

LT1109ACN8-12 Summary of contents

Page 1

FEATURE S Uses Off-the-Shelf Inductors Low Cost 8-Pin DIP or SO Package Fixed 5V or 12V Output or Adjustable Version Only Four External Components Required 360 A Standby Current Logic-Controlled Shutdown O U PPLICATI A S Flash Memory VPP Generators ...

Page 2

... Shutdown Pin Voltage ........................................... 5.5V U PACKAGE/ORDER I FOR ATIO TOP VIEW (SENSE SHUTDOWN 2 7 LT1109ACN8 LT1109ACN8-5 PGND GND 4 5 LT1109ACN8-12 N8 PACKAGE 8-LEAD PLASTIC DIP *FIXED VERSIONS 130 C/W JMAX JA ELECTRICAL C HARA TERISTICS C SYMBOL PARAMETER I Quiescent Current Q V Input Voltage IN Comparator Trip Point Voltage V Output Sense Voltage ...

Page 3

W U TYPICAL PERFOR A Efficiency 12V OUT LOAD = 120mA 4.2 4.4 4.6 4.8 5.0 5.2 5.4 5.6 5.8 INPUT VOLTAGE (V) 1109A G01 ...

Page 4

LT1109A W U TYPICAL PERFOR A LT1109A-12 Output Voltage 12.3 12.2 12.1 12.0 11.9 11.8 11.7 –50 – TEMPERATURE (°C) W BLOCK I D AGRA S LT1109A-5, LT1109A-12 V SENSE IN R2 250k 1.25V + REF COMP 120kHz ...

Page 5

... A1, the oscillator is turned off. A low signal on the shutdown pin gates off the oscillator, overriding A1. With SHUTDOWN low, quiescent current remains at 360 A. TM Burst Mode is a trademark of Linear Technology Corporation W U are unsuitable for use in any switching regulator applica- tion. Although they are rated at 1A, the switching time of a 1N4001 is in the range. At best, efficiency will be severely compromised if this diode is used ...

Page 6

LT1109A O U TYPICAL A PPLICATI 6 S 3.3V Powered Flash Memory VPP Generator MBRS130T3 3. SENSE IN LT1109A-12 7 SHUTDOWN GND PGND 5 4 SHUTDOWN * COILTRONICS ...

Page 7

... SUMIDA CD54-330LC ** AVX TPS SERIES 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 Converter ...

Page 8

... MAX 0.250 ± 0.010 (6.350 ± 0.254 0392 0.189 – 0.197 (4.801 – 5.004 0.228 – 0.244 0.150 – 0.157 (5.791 – 6.197) (3.810 – 3.988 SO8 0392 sn1109A 1109afs LT/GP 0493 10K REV 0 LINEAR TECHNOLOGY CORPORATION 1993 ...

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