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LT1109CN8-12

Part # LT1109CN8-12
Description IC REG BOOST 12V 2A 8DIP
Category IC
Availability Out of Stock
Qty 0
Qty Price
1 + $5.14588

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Technical Document


DISCLAIMER: The information provided herein is solely for informational purposes. Customers must be aware of the suitability of this product for their application, and consider that variable factors such as Manufacturer, Product Category, Date Codes, Pictures and Descriptions may differ from available inventory.

LT1109
1
Micropower Low Cost
DC/DC Converter
Adjustable and Fixed 5V, 12V
All Surface Mount
Flash Memory VPP Generator
U
S
A
O
PP
L
IC
AT
I
■
Flash Memory VPP Generators
■
3V to 5V Converters
■
5V to 12V Converters
■
Disk Drives
■
PC Plug-In Cards
■
Peripherals
■
Battery-Powered Equipment
U
A
O
PP
L
IC
AT
ITY
P
I
CA
L
■
Uses Off-the-Shelf Inductors
■
Only 33µH Inductor Required
■
Low Cost
■
3-Lead TO-92, SO8, or 8-Pin DIP
■
Adjustable or Fixed 5V or 12V Output
■
120kHz Oscillator
■
Only Three External Components Required
■
320µA I
Q
■
1.6V Minimum Start-Up Voltage
■
Logic Controlled Shutdown
D
U
ESCRIPTIO
S
F
EA
T
U
RE
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.
SHUTDOWN
5V/DIV
OV
V
OUT
5V/DIV
1ms/DIV
LT1109 • TA02
L1
LT1109 • TA01
+
GND
SW
SENSE
LT1109CS8-12
V
OUT
12V
80mA
MBRS120T3
V
IN
V
IN
5V
SHUTDOWN PROGRAM
SHUTDOWN*
* 8-PIN PACKAGE ONLY
L1 = SUMIDA CD54-330LC (I
OUT
= 80mA)
COILTRONICS CTX33-1 (80mA)
MURATA-ERIE LQH4N330K (I
OUT
= 50mA)
ISI LCS2414-330K (I
OUT
= 50mA)
**C1 = MATSUO 267M1602226 OR EQUIVALENT
✝
✝
33µH
1
7
3
8
C1**
22µF
16V
4
Flash Memory Program Output
OUTPUT CURRENT (mA)
0
0
OUTPUT VOLTAGE (V)
3
6
9
12
15
10 100
LT1109 • TPC01
20 30 40 50 60 70 80 90
V
IN
= 5V
Output Voltage
LT1109
2
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
I
Q
Quiescent Current Switch Off ● 320 550 µA
Minimum Start-Up Voltage 1.6 V
at V
OUT
Pin (Z Package)
V
IN
Input Voltage (N8, S8 Package) ● 3V
Comparative Trip Point Voltage LT1109 ● 1.20 1.25 1.30 V
V
OUT
Output Voltage LT1109-5; 3V ≤ V
IN
≤ 5V ● 4.75 5.00 5.25 V
LT1109-12; 3V ≤ V
IN
≤ 12V ● 11.52 12.00 12.55 V
Comparator Hysteresis LT1109 ● 8 12.5 mV
Output Voltage Ripple LT1109-5 ● 25 50 mV
LT1109-12
● 60 120 mV
f
OSC
Oscillator Frequency 100 120 140 kHz
● 90 150 kHz
t
ON
Switch ON Time 3.3 4.2 5.3 µs
● 3.0 5.5 µs
DC Duty Cycle Full Load ● 45 50 60 %
V
CESAT
Switch Saturation Voltage I
SW
= 500mA 0.4 0.7 V
LT1109-5: V
IN
= 3V; LT1109-12: V
IN
= 5V ● 0.5 0.8 V
T
A
= 25°C, V
IN
= 3V (LT1109CN8, LT1109CS8), unless otherwise specified.
E
LECTR
IC
AL C CHARA TERIST
ICS
WU
U
PACKAGE
/
O
RDER I FOR ATIO
1
2
3
4
8
7
6
5
TOP VIEW
VIN
NC
SW
GND
SENSE
SHUTDOWN
NC
NC
N8 PACKAGE
8-LEAD PLASTIC DIP
LT1109 • PO102
1
2
3
4
8
7
6
5
TOP VIEW
SENSE
SHUTDOWN
NC
NC
V
IN
NC
SW
GND
S8 PACKAGE
8-LEAD PLASTIC SOIC
LT1109 • PO103
T
JMAX
= 100°C, θ
JA
= 130°C/W
T
JMAX
= 100°C, θ
JA
= 150°C/W
T
JMAX
= 100°C, θ
JA
= 160°C/W
GND
2
SW
3 1
Z PACKAGE
3-LEAD TO-92 PLASTIC
BOTTOM VIEW
OUT
V
LT1109 • POI01
LT1109CZ-5
LT1109CZ-12
ORDER PART
NUMBER
ORDER PART
NUMBER
S8 PART
MARKING
ORDER PART
NUMBER
LT1109CS8
LT1109CS8-5
LT1109CS8-12
LT1109CN8
LT1109CN8-5
LT1109CN8-12
1109
10905
10912
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
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
OUT
) .............................. –0.4V to 20V
SW Pin Voltage..........................................–0.4V to 50V
SHUTDOWN Pin Voltage......................................... 6.0V
Maximum Power Dissipation ............................. 300mW
LT1109
3
CCHARA TERIST
ICS
UW
AT
Y
P
I
CA
LPER
F
O
R
C
E
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Switch Leakage Current V
SW
= 12V 1 10 µA
V
IH
SHUTDOWN Pin High N8, S8 Package ● 2.0 V
V
IL
SHUTDOWN Pin Low N8, S8 Package ● 0.8 V
I
IH
SHUTDOWN Pin Input Current N8, S8 Package, V
SHUTDOWN
= 4V ● 10 µA
I
IL
SHUTDOWN Pin Input Current N8, S8 Package, V
SHUTDOWN
= 0V ● 20 µA
The ● denotes the specifications which apply over the full operating
temperature range.
E
LECTR
IC
AL C CHARA TERIST
ICS
T
A
= 25°C, V
IN
= 3V (LT1109CN8, LT1109CS8), unless otherwise specified.
INPUT VOLTAGE (V)
0
110
OSCILLATOR FREQUENCY (kHz)
114
118
122
128
130
220
LT1109 • TPC03
46810
126
124
120
116
112
12 14 16 18
TEMPERATURE (°C)
–50
60
FREQUENCY (kHz)
80
100
120
140
160
–25 100
LT1109 • TPC02
0 255075
Oscillator Frequency Oscillator Frequency Switch ON Time
TEMPERATURE (°C)
–50
3
SWITCH ON TIME (µs)
4
7
100
LT1109 • TPC04
–25 0 25
6
5
50 75
TEMPERATURE (°C)
–50
0
V
CESAT
(mV)
200
700
100
LT1109 • TPC06
–25 0 25
500
400
50 75
600
300
100
I
SW
= 500mA
SWITCH CURRENT (A)
0
0
V
CESAT
(V)
0.4
1.2
1.0
LT1109 • TPC07
0.1 0.3 0.5
0.8
0.6
0.7 0.9
1.0
0.2
V
IN
= 5V
T
A
= 25°C
0.2 0.4 0.6 0.8
Duty Cycle Switch Saturation Voltage Switch Saturation Voltage
TEMPERATURE (°C)
–50
30
DUTY CYCLE (%)
40
70
100
LT1109 • TPC05
–25 0 25
60
50
50 75
65
55
45
35
123NEXT
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