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LT1109 Datasheet(PDF) 1 Page - Linear Technology

Part No. LT1109
Description  Micropower Low Cost DC/DC Converter Adjustable and Fixed 5V, 12V
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Maker  LINER [Linear Technology]
Homepage  http://www.linear.com
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LT1109 Datasheet(HTML) 1 Page - Linear Technology

   
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LT1109
1
Micropower Low Cost
DC/DC Converter
Adjustable and Fixed 5V, 12V
All Surface Mount
Flash Memory VPP Generator
S
APPLICATI
s
Flash Memory VPP Generators
s
3V to 5V Converters
s
5V to 12V Converters
s
Disk Drives
s
PC Plug-In Cards
s
Peripherals
s
Battery-Powered Equipment
APPLICATI
TYPICAL
s
Uses Off-the-Shelf Inductors
s
Only 33
µH Inductor Required
s
Low Cost
s
3-Lead TO-92, SO8, or 8-Pin DIP
s
Adjustable or Fixed 5V or 12V Output
s
120kHz Oscillator
s
Only Three External Components Required
s
320
µA IQ
s
1.6V Minimum Start-Up Voltage
s
Logic Controlled Shutdown
DESCRIPTIO
S
FEATURE
The LT1109 is a simple step-up DC/DC converter. Avail-
able in 8-pin SO, 3-lead TO-92 (fixed output only) or
miniDIP packages, the devices require only three external
components to construct a complete DC/DC converter.
Current drain is just 320
µA at no load, making the device
ideal for cost-sensitive applications where standby cur-
rent must be kept to a minimum.
The LT1109-5 can deliver 5V at 100mA from a 3V input
and the LT1109-12 can deliver 12V at 60mA from a 5V
input. The 8-pin versions also feature a logic controlled
SHUTDOWN pin that turns off the oscillator when taken
low. The gated-oscillator design requires no frequency
compensation components. The high frequency 120kHz
oscillator permits the use of small surface mount induc-
tors and capacitors. For a 5V to 12V at 120mA converter,
see the LT1109A. Foa a 5V to 12V at 200mA converter
with 20
µA shutdown current, see the LT1301.
SHUTDOWN
5V/DIV
OV
VOUT
5V/DIV
1ms/DIV
LT1109 • TA02
L1
LT1109 • TA01
+
GND
SW
SENSE
LT1109CS8-12
VOUT
12V
80mA
MBRS120T3
VIN
VIN
5V
SHUTDOWN
PROGRAM
SHUTDOWN*
* 8-PIN PACKAGE ONLY
L1 = SUMIDA CD54-330LC (IOUT = 80mA)
COILTRONICS CTX33-1 (80mA)
MURATA-ERIE LQH4N330K (I
OUT = 50mA)
ISI LCS2414-330K (IOUT = 50mA)
**C1 = MATSUO 267M1602226 OR EQUIVALENT
¦
¦
33
µH
1
7
3
8
C1**
22
µF
16V
4
Flash Memory Program Output
OUTPUT CURRENT (mA)
0
0
3
6
9
12
15
10
100
LT1109 • TPC01
20 30 40 50 60 70 80 90
VIN = 5V
Output Voltage


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