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LT1109A Datasheet

Micropower DC/DC Converter Flash Memory VPP Generator Adjustable and Fixed 5V/ 12V

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LT1109A
Micropower
DC/DC Converter
Flash Memory VPP Generator
Adjustable and Fixed 5V, 12V
FEATURES
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 360µA Standby Current
s Logic-Controlled Shutdown
APPLICATI S
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
DESCRIPTIO
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.
TYPICAL APPLICATI
All Surface Mount
Flash Memory VPP Generator
+VIN
5V
C1
22µF
10V
L1*
33µH
MBRS130T3
1 VIN
3
SW
8
SENSE
+ LT1109ACS8-12
7 SHUTDOWN
PGND GND
** 4 5
+
VOUT
12V
C2
47µF
20V
* COILTRONICS CTX33-2
SUMIDA CD54-330LC
** 1 = PROGRAM
0 = SHUTDOWN
1109A TA01
Output Current
13.0
12V
12.5
VOUT
VIN = 5V
2V/DIV
12.0
11.5 SHUTDOWN
VIN = 4.5V
5V/DIV
11.0
10.5
10.0
0
50 100 150 200 250 300
OUTPUT CURRENT (mA)
1109A TA02
Output Voltage
500µs/DIV
1109A TA03
1


Linear Technology Electronic Components Datasheet

LT1109A Datasheet

Micropower DC/DC Converter Flash Memory VPP Generator Adjustable and Fixed 5V/ 12V

No Preview Available !

LT1109A
ABSOLUTE AXI U RATI GS
(Voltages Referred to GND Pin)
Supply Voltage (VIN) ................................ – 0.4V to 20V
SW Pin Voltage ........................................ – 0.4V to 50V
Feedback Pin Voltage (LT1109A) ........................... 5.5V
Shutdown Pin Voltage ........................................... 5.5V
Switch Current .......................................................... 2A
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
PACKAGE/ORDER I FOR ATIO
TOP VIEW
VIN 1
NC 2
SW 3
PGND 4
8 FB (SENSE)*
7 SHUTDOWN
6 NC
5 GND
N8 PACKAGE
8-LEAD PLASTIC DIP
*FIXED VERSIONS
TJMAX = 90°C, θJA = 130°C/W
ORDER PART
NUMBER
LT1109ACN8
LT1109ACN8-5
LT1109ACN8-12
TOP VIEW
VIN 1
NC 2
SW 3
PGND 4
8 FB (SENSE)*
7 SHUTDOWN
6 NC
5 GND
S8 PACKAGE
8-LEAD PLASTIC SO
*FIXED VERSIONS
TJMAX = 90°C, θJA = 150°C/ W
ORDER PART
NUMBER
LT1109ACS8
LT1109ACS8-5
LT1109ACS8-12
S8 PART
MARKING
1109A
109A5
109A1
ELECTRICAL CHARACTERISTICS TA = 25°C, VIN = 3V, unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
MIN
IQ Quiescent Current
VIN Input Voltage
Comparator Trip Point Voltage
Switch Off
LT1109A
q
q2
q 1.20
VOUT Output Sense Voltage
Comparator Hysteresis
LT1109A-5; 2V VIN 5V
LT1109A-12; 2V VIN 12V
LT1109A
q 4.75
q 11.52
q
Output Voltage Ripple
LT1109A-5
LT1109A-12
q
q
fOSC Oscillator Frequency
105
q 95
tON Switch On Time
4.1
q 3.8
DC Duty Cycle
Full Load
q 60
VCESAT
VIH
VIL
IIH
IL
Switch Saturation Voltage
Switch Leakage Current
SHUTDOWN Pin High
SHUTDOWN Pin Low
SHUTDOWN Pin Input Current
SHUTDOWN Pin Input Current
VIN = 3V, ISW = 650mA
VIN = 5V, ISW = 1A
VSW = 12V
VSHUTDOWN 2.0V
0V VSHUTDOWN 0.8V
q
q 2.0
q
q
q
The q denotes specifications which apply over the full operating
temperature range.
TYP
360
1.25
5.00
12.00
8
25
60
120
5.5
68
0.5
0.7
1
MAX
500
9
1.30
5.25
12.55
12.5
50
120
135
155
6.9
7.4
77
0.65
1.00
10
0.8
10
20
2
UNITS
µA
V
V
V
V
mV
mV
mV
kHz
kHz
µs
µs
%
V
V
µA
V
V
µA
µA


Part Number LT1109A
Description Micropower DC/DC Converter Flash Memory VPP Generator Adjustable and Fixed 5V/ 12V
Maker Linear Technology
Total Page 8 Pages
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