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LT1109ACN8-12#PBF

P1-P3P4-P6P7-P8
1
LT1109A
Micropower
DC/DC Converter
Flash Memory VPP Generator
Adjustable and Fixed 5V, 12V
U
A
O
PP
L
IC
AT
ITY
P
I
CA
L
Output Voltage
V
OUT
2V/DIV
SHUTDOWN
5V/DIV
500µs/DIV
1109A TA03
12V
Output Current
OUTPUT CURRENT (mA)
0
OUTPUT VOLTAGE (V)
13.0
12.5
12.0
11.5
11.0
10.5
10.0
50
100 150 200
1109A TA02
250 300
V
IN
= 4.5V
V
IN
= 5V
S
F
EA
T
U
RE
■
Uses Off-the-Shelf Inductors
■
Low Cost
■
8-Pin DIP or SO Package
■
Fixed 5V or 12V Output or Adjustable Version
■
Only Four External Components Required
■
360µA Standby Current
■
Logic-Controlled Shutdown
U
S
A
O
PP
L
IC
AT
I
■
Flash Memory VPP
Generators
■
5V to 12V Converters
■
3.3V to 12V Converters
■
Disk Drives
■
PC Plug-In Cards
■
Peripherals
■
Battery-Powered Equipment
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.
D
U
ESCRIPTIO
All Surface Mount
Flash Memory VPP
Generator
+
SENSE
V
IN
PGND GND
LT1109ACS8-12
SHUTDOWN
SW
MBRS130T3
8
3
1
7
45
C2
47µF
20V
V
OUT
12V
L1*
33µH
COILTRONICS CTX33-2
SUMIDA CD54-330LC
1 = PROGRAM
0 = SHUTDOWN
+
+V
IN
5V
C1
22µF
10V
1109A TA01
**
*
**
2
LT1109A
A
U
G
W
A
W
U
W
ARB
S
O
LU
T
EXI T
I
S
(Voltages Referred to GND Pin)
Supply Voltage (V
IN
) ................................ – 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
T
JMAX
= 90°C, θ
JA
= 150°C/W
1
2
3
4
8
7
6
5
TOP VIEW
S8 PACKAGE
8-LEAD PLASTIC SO
*FIXED VERSIONS
V
IN
NC
SW
PGND
FB (SENSE)*
SHUTDOWN
NC
GND
LT1109ACS8
LT1109ACS8-5
LT1109ACS8-12
1109A
1109A5
1109A1
LT1109ACN8
LT1109ACN8-5
LT1109ACN8-12
WU
U
PACKAGE
/
O
RDER I FOR ATIO
ORDER PART
NUMBER
1
2
3
4
8
7
6
5
TOP VIEW
V
IN
NC
SW
PGND
N8 PACKAGE
8-LEAD PLASTIC DIP
*FIXED VERSIONS
FB (SENSE)*
SHUTDOWN
NC
GND
ORDER PART
NUMBER
S8 PART
MARKING
E
LECTR
IC
AL C CHARA TERIST
ICS
T
A
= 25°C, V
IN
= 3V, unless otherwise noted.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
I
Q
Quiescent Current Switch Off ● 360 500 µA
V
IN
Input Voltage ● 29V
Comparator Trip Point Voltage LT1109A ● 1.20 1.25 1.30 V
V
OUT
Output Sense Voltage LT1109A-5; 2V ≤ V
IN
≤ 5V ● 4.75 5.00 5.25 V
LT1109A-12; 2V ≤ V
IN
≤ 12V ● 11.52 12.00 12.55 V
Comparator Hysteresis LT1109A ● 8 12.5 mV
Output Voltage Ripple LT1109A-5
● 25 50 mV
LT1109A-12 ● 60 120 mV
f
OSC
Oscillator Frequency 105 120 135 kHz
● 95 155 kHz
t
ON
Switch On Time 4.1 5.5 6.9 µs
● 3.8 7.4 µs
DC Duty Cycle Full Load ● 60 68 77 %
V
CESAT
Switch Saturation Voltage V
IN
= 3V, I
SW
= 650mA ● 0.5 0.65 V
V
IN
= 5V, I
SW
= 1A 0.7 1.00 V
Switch Leakage Current V
SW
= 12V 1 10 µA
V
IH
SHUTDOWN Pin High ● 2.0 V
V
IL
SHUTDOWN Pin Low ● 0.8 V
I
IH
SHUTDOWN Pin Input Current V
SHUTDOWN
≥ 2.0V ● 10 µA
I
L
SHUTDOWN Pin Input Current 0V ≤ V
SHUTDOWN
≤ 0.8V ● 20 µA
The ● denotes specifications which apply over the full operating
temperature range.
T
JMAX
= 90°C, θ
JA
= 130°C/W
3
LT1109A
CCHARA TERIST
ICS
UW
AT
Y
P
I
CA
LPER
F
O
R
C
E
TEMPERATURE (°C)
–50
FREQUENCY (kHz)
160
140
120
100
80
60
–25
02550
1109A G02
75 100
Efficiency
Oscillator Frequency Duty Cycle
Switch Saturation Voltage
Switch Saturation Voltage
TEMPERATURE (°C)
DUTY CYCLE (%)
80
75
70
65
60
55
50
1109A G03
–50
–25
0 25 50 75 100
INPUT VOLTAGE (V)
4.2
EFFICIENCY (%)
5.8
1109A G01
4.6
5.0
5.4
90
85
80
75
70
4.4 4.8 5.2
5.6
V
IN
= 5V
V
OUT
= 12V
LOAD = 120mA
L = 29µH
I
SWITCH
(A)
0
V
CESAT
(V)
1.2
1109A G04
0.4 0.8 1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
0.2 0.6 1.0 1.4
V
IN
= 3V
V
IN
= 2V
V
IN
= 5V
TEMPERATURE (°C)
V
CESAT
(V)
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
1109A G05
–50
–25
0 25 50 75 100
I
SW
= 650mA
Switch On Time
TEMPERATURE (°C)
SWITCH ON TIME (µs)
8
7
6
5
4
3
1109A G06
–50
–25
0 25 50 75 100
Quiescent Current
TEMPERATURE (°C)
QUIESCENT CURRENT (µA)
500
450
400
350
300
250
200
1109A G07
–50
–25
0 25 50 75 100
Quiescent Current
INPUT VOLTAGE (V)
0
QUIESCENT CURRENT (µA)
500
450
400
350
300
250
16
1109A G08
4
8
12
20
26
10
14 18
T
A
= 25°C
P1-P3P4-P6P7-P8

LT1109ACN8-12#PBF

Mfr. #:
Buy LT1109ACN8-12#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators Micropower DC/DC Converter Flash Memory VPP Generator Adjustable and Fixed 5V, 12V
Lifecycle:
New from this manufacturer.
Delivery:
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