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LT1109ACS8-12 Datasheet Download

Part No.:
LT1109ACS8-12
Download:
Download Datasheet
Description:
[Micropower DC/DC Converter Flash Memory VPP Generator Adjustable and Fixed 5V, 12V]
File Size:
153 K
Page:
8 Pages
Logo:
Manufacturer:
LINER [ LINEAR TECHNOLOGY ]
PCB Prototype
 LT1109ACS8-12 Datasheet Page:2LT1109ACS8-12 Datasheet Page:3LT1109ACS8-12 Datasheet Page:4LT1109ACS8-12 Datasheet Page:5LT1109ACS8-12 Datasheet Page:6LT1109ACS8-12 Datasheet Page:7LT1109ACS8-12 Datasheet Page:8 
LT1109A
Micropower
DC/DC Converter
Flash Memory VPP Generator
Adjustable and Fixed 5V, 12V
FEATURES
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DESCRIPTIO
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
360µA Standby Current
Logic-Controlled Shutdown
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 360µA 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.
APPLICATI
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Flash Memory VPP Generators
5V to 12V Converters
3.3V to 12V Converters
Disk Drives
PC Plug-In Cards
Peripherals
Battery-Powered Equipment
TYPICAL APPLICATI
All Surface Mount
Flash Memory VPP Generator
L1*
33µH
MBRS130T3
3
SW
V
IN
SENSE
Output Current
13.0
12V
12.5
OUTPUT VOLTAGE (V)
+V
IN
5V
C1
22µF
10V
1
8
V
OUT
12V
C2
47µF
20V
12.0
11.5
11.0
10.5
V
IN
= 5V
+
7
LT1109ACS8-12
SHUTDOWN
PGND
GND
4
5
+
V
IN
= 4.5V
SHUTDOWN
5V/DIV
500µs/DIV
1109A TA03
**
* COILTRONICS CTX33-2
SUMIDA CD54-330LC
** 1 = PROGRAM
0 = SHUTDOWN
10.0
1109A TA01
0
50
250
100
150
200
OUTPUT CURRENT (mA)
300
1109A TA02
U
Output Voltage
V
OUT
2V/DIV
UO
UO
1