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Linear Technology Electronic Components Datasheet

LT1109 Datasheet

Micropower Low Cost DC/DC Converter Adjustable and Fixed 5V/ 12V

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FEATURES
s Uses Off-the-Shelf Inductors
s Only 33µH 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 320µA IQ
s 1.6V Minimum Start-Up Voltage
s Logic Controlled Shutdown
APPLICATI S
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
LT110 9
Micropower Low Cost
DC/DC Converter
Adjustable and Fixed 5V, 12V
DESCRIPTIO
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 320µA 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 20µA shutdown current, see the LT1301.
TYPICAL APPLICATI
All Surface Mount
Flash Memory VPP Generator
L1¦
33µH
MBRS120T3
VIN
5V
SHUTDOWN
1
VIN
3
SW 8
SENSE
LT1109CS8-12
7
SHUTDOWN*
GND
4
+
PROGRAM
VOUT
12V
80mA
C1**
22µF
16V
* 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
LT1109 • TA01
Output Voltage
15
VIN = 5V
12
Flash Memory Program Output
VOUT
5V/DIV
OV
9
SHUTDOWN
5V/DIV
6 1ms/DIV
LT1109 • TA02
3
0
0 10 20 30 40 50 60 70 80 90 100
OUTPUT CURRENT (mA)
LT1109 • TPC01
1


Linear Technology Electronic Components Datasheet

LT1109 Datasheet

Micropower Low Cost DC/DC Converter Adjustable and Fixed 5V/ 12V

No Preview Available !

LT110 9
ABSOLUTE AXI U RATI GS
(Voltages Referred to GND Pin)
Supply Voltage (VOUT) .............................. – 0.4V to 20V
SW Pin Voltage .......................................... – 0.4V to 50V
SHUTDOWN Pin Voltage......................................... 6.0V
Maximum Power Dissipation ............................. 300mW
Operating Temperature Range ..................... 0°C to 70°C
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec.)................. 300°C
Switch Current ........................................................ 1.2A
PACKAGE/ORDER I FOR ATIO
VIN 1
NC 2
SW 3
GND 4
TOP VIEW
8 SENSE
7 SHUTDOWN
6 NC
5 NC
N8 PACKAGE
8-LEAD PLASTIC DIP
LT1109 • PO102
TJMAX = 100°C, θJA = 130°C/W
ORDER PART
NUMBER
LT1109CN8
LT1109CN8-5
LT1109CN8-12
VIN 1
NC 2
SW 3
GND 4
TOP VIEW
8 SENSE
7 SHUTDOWN
6 NC
5 NC
S8 PACKAGE
8-LEAD PLASTIC SOIC
LT1109 • PO103
TJMAX = 100°C, θJA = 150°C/W
ORDER PART
NUMBER
S8 PART
MARKING
LT1109CS8
LT1109CS8-5
LT1109CS8-12
1109
10905
10912
BOTTOM VIEW
321
VOUT SW GND
Z PACKAGE
3-LEAD TO-92 PLASTIC LT1109 • POI01
TJMAX = 100°C, θJA = 160°C/W
ORDER PART
NUMBER
LT1109CZ-5
LT1109CZ-12
ELECTRICAL CHARACTERISTICS TA = 25°C, VIN = 3V (LT1109CN8, LT1109CS8), unless otherwise specified.
SYMBOL
IQ
VIN
VOUT
fOSC
tON
DC
VCESAT
PARAMETER
Quiescent Current
Minimum Start-Up Voltage
at VOUT Pin (Z Package)
Input Voltage (N8, S8 Package)
Comparative Trip Point Voltage
Output Voltage
Comparator Hysteresis
Output Voltage Ripple
Oscillator Frequency
Switch ON Time
Duty Cycle
Switch Saturation Voltage
CONDITIONS
Switch Off
q
LT1109
LT1109-5; 3V VIN 5V
LT1109-12; 3V VIN 12V
LT1109
LT1109-5
LT1109-12
q
q
q
q
q
q
q
q
q
Full Load
q
ISW = 500mA
LT1109-5: VIN = 3V; LT1109-12: VIN = 5V q
MIN
1.6
3
1.20
4.75
11.52
100
90
3.3
3.0
45
TYP
320
1.25
5.00
12.00
8
25
60
120
4.2
50
0.4
0.5
MAX
550
1.30
5.25
12.55
12.5
50
120
140
150
5.3
5.5
60
0.7
0.8
UNITS
µA
V
V
V
V
V
mV
mV
mV
kHz
kHz
µs
µs
%
V
V
2


Part Number LT1109
Description Micropower Low Cost DC/DC Converter Adjustable and Fixed 5V/ 12V
Maker Linear Technology
Total Page 8 Pages
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