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| LT1109A_03 Datasheet, PDF (2/8 Pages) Linear Technology – Micropower DC/DC Converter Flash Memory VPP Generator Adjustable and Fixed 5V, 12V | |||
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LT1109A
ABSOLUTE AXI U RATI GS
(Voltages Referred to GND Pin)
Supply Voltage (VIN) ................................ â 0.4V to 20V
SW Pin Voltage ........................................ â 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 ................ â 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
1109A5
1109A1
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
q
2
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
q
LT1109A-12
q
fOSC
Oscillator Frequency
105
q
95
tON
Switch On Time
4.1
q
3.8
DC
Duty Cycle
Full Load
q
60
VCESAT Switch Saturation Voltage
Switch Leakage Current
VIH
SHUTDOWN Pin High
VIL
SHUTDOWN Pin Low
IIH
SHUTDOWN Pin Input Current
IL
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
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