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LT1109CZ-12#PBF

P1-P3P4-P6P7-P8
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
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LT1109CZ-12#PBF

Mfr. #:
Buy LT1109CZ-12#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators Micropower Low Cost DC/DC Converter Adjustable and Fixed 5V, 12V
Lifecycle:
New from this manufacturer.
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