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LT1109A Datasheet(PDF) 1 Page - Linear Technology

Part No. LT1109A
Description  Micropower DC/DC Converter Flash Memory VPP Generator Adjustable and Fixed 5V, 12V
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Maker  LINER [Linear Technology]
Homepage  http://www.linear.com
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LT1109A Datasheet(HTML) 1 Page - Linear Technology

   
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LT1109A
Micropower
DC/DC Converter
Flash Memory VPP Generator
Adjustable and Fixed 5V, 12V
APPLICATI
TYPICAL
Output Voltage
VOUT
2V/DIV
SHUTDOWN
5V/DIV
500
µs/DIV
1109A TA03
12V
Output Current
OUTPUT CURRENT (mA)
0
13.0
12.5
12.0
11.5
11.0
10.5
10.0
50
100
150
200
1109A TA02
250
300
VIN = 4.5V
VIN = 5V
S
FEATURE
s
Uses Off-the-Shelf Inductors
s
Low Cost
s
8-Pin DIP or SO Package
s
Fixed 5V or 12V Output or Adjustable Version
s
Only Four External Components Required
s
360
µA Standby Current
s
Logic-Controlled Shutdown
S
APPLICATI
s
Flash Memory VPP Generators
s
5V to 12V Converters
s
3.3V to 12V Converters
s
Disk Drives
s
PC Plug-In Cards
s
Peripherals
s
Battery-Powered Equipment
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
µA 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.
DESCRIPTIO
All Surface Mount
Flash Memory VPP Generator
+
SENSE
VIN
PGND
GND
LT1109ACS8-12
SHUTDOWN
SW
MBRS130T3
8
3
1
7
45
C2
47
µF
20V
VOUT
12V
L1*
33
µH
COILTRONICS CTX33-2
SUMIDA CD54-330LC
1 = PROGRAM
0 = SHUTDOWN
+
+VIN
5V
C1
22
µF
10V
1109A TA01
**
*
**


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