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LT1109A Datasheet(PDF) 2 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) 2 Page - Linear Technology

   
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LT1109A
A
G
A
U
A
R
BSOLUTEXI
TI
S
(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
TJMAX = 90°C, θJA = 150°C/W
1
2
3
4
8
7
6
5
TOP VIEW
S8 PACKAGE
8-LEAD PLASTIC SO
*FIXED VERSIONS
VIN
NC
SW
PGND
FB (SENSE)*
SHUTDOWN
NC
GND
LT1109ACS8
LT1109ACS8-5
LT1109ACS8-12
1109A
109A5
109A1
LT1109ACN8
LT1109ACN8-5
LT1109ACN8-12
PACKAGE/ORDER I FOR ATIO
ORDER PART
NUMBER
1
2
3
4
8
7
6
5
TOP VIEW
VIN
NC
SW
PGND
N8 PACKAGE
8-LEAD PLASTIC DIP
*FIXED VERSIONS
FB (SENSE)*
SHUTDOWN
NC
GND
ORDER PART
NUMBER
S8 PART
MARKING
ELECTRICAL C
C
HARA TERISTICS T
A = 25°C, VIN = 3V, unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
IQ
Quiescent Current
Switch Off
q
360
500
µA
VIN
Input Voltage
q
29
V
Comparator Trip Point Voltage
LT1109A
q
1.20
1.25
1.30
V
VOUT
Output Sense Voltage
LT1109A-5; 2V
≤ VIN ≤ 5V
q
4.75
5.00
5.25
V
LT1109A-12; 2V
≤ VIN ≤ 12V
q
11.52
12.00
12.55
V
Comparator Hysteresis
LT1109A
q
8
12.5
mV
Output Voltage Ripple
LT1109A-5
q
25
50
mV
LT1109A-12
q
60
120
mV
fOSC
Oscillator Frequency
105
120
135
kHz
q
95
155
kHz
tON
Switch On Time
4.1
5.5
6.9
µs
q
3.8
7.4
µs
DC
Duty Cycle
Full Load
q
60
68
77
%
VCESAT
Switch Saturation Voltage
VIN = 3V, ISW = 650mA
q
0.5
0.65
V
VIN = 5V, ISW = 1A
0.7
1.00
V
Switch Leakage Current
VSW = 12V
1
10
µA
VIH
SHUTDOWN Pin High
q
2.0
V
VIL
SHUTDOWN Pin Low
q
0.8
V
IIH
SHUTDOWN Pin Input Current
VSHUTDOWN ≥ 2.0V
q
10
µA
IL
SHUTDOWN Pin Input Current
0V
≤ VSHUTDOWN ≤ 0.8V
q
20
µA
The q denotes specifications which apply over the full operating
temperature range.
TJMAX = 90°C, θJA = 130°C/W


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