LT1109CZ-12 Linear Technology, LT1109CZ-12 Datasheet

IC DC/DC CONV 12V TO-92-3

LT1109CZ-12

Manufacturer Part Number
LT1109CZ-12
Description
IC DC/DC CONV 12V TO-92-3
Manufacturer
Linear Technology
Type
Step-Up (Boost)r
Datasheet

Specifications of LT1109CZ-12

Internal Switch(s)
Yes
Synchronous Rectifier
No
Number Of Outputs
1
Voltage - Output
12V
Current - Output
100mA
Frequency - Switching
120kHz
Voltage - Input
3V, 5V
Operating Temperature
0°C ~ 70°C
Mounting Type
Through Hole
Package / Case
TO-92-3 (Standard Body), TO-226
Power - Output
300mW
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
* 8-PIN PACKAGE ONLY
MURATA-ERIE LQH4N330K (I
**C1 = MATSUO 267M1602226 OR EQUIVALENT
A
SHUTDOWN
FEATURE
TYPICAL
L1 = SUMIDA CD54-330LC (I
PPLICATI
Flash Memory VPP Generators
3V to 5V Converters
5V to 12V Converters
Disk Drives
PC Plug-In Cards
Peripherals
Battery-Powered Equipment
Uses Off-the-Shelf Inductors
Only 33 H 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
320 A I
1.6V Minimum Start-Up Voltage
Logic Controlled Shutdown
V
5V
IN
COILTRONICS CTX33-1 (80mA)
ISI LCS2414-330K (I
Flash Memory VPP Generator
PROGRAM
Q
All Surface Mount
1
7
33 H
L1
S
A
V
SHUTDOWN*
IN
LT1109CS8-12
O
PPLICATI
OUT
GND
OUT
U
SW
= 50mA)
3
4
S
= 80mA)
SENSE
MBRS120T3
OUT
= 50mA)
8
+
O
LT1109 • TA01
U
C1**
22 F
16V
V
12V
80mA
OUT
15
12
9
6
3
0
0
10
20 30 40 50 60 70 80 90
Adjustable and Fixed 5V, 12V
OUTPUT CURRENT (mA)
Output Voltage
D
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 320 A 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 20 A shutdown current, see the LT1301.
ESCRIPTIO
V
IN
Micropower Low Cost
= 5V
LT1109 • TPC01
100
DC/DC Converter
U
SHUTDOWN
5V/DIV
5V/DIV
V
OUT
OV
Flash Memory Program Output
1ms/DIV
LT1109
LT1109 • TA02
1

Related parts for LT1109CZ-12

LT1109CZ-12 Summary of contents

Page 1

FEATURE S Uses Off-the-Shelf Inductors Only 33 H 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 320 1.6V Minimum Start-Up Voltage ...

Page 2

... LT1109- 3V; LT1109-12 BOTTOM VIEW GND OUT Z PACKAGE 3-LEAD TO-92 PLASTIC LT1109 • POI01 T = 100 C, = 160 C/W JMAX JA ORDER PART NUMBER LT1109CZ-5 LT1109CZ-12 MIN TYP MAX 320 550 1.6 3 1.20 1.25 1.30 4.75 5.00 5.25 11.52 12.00 12. 120 100 120 ...

Page 3

ELECTRICAL C HARA TERISTICS C SYMBOL PARAMETER Switch Leakage Current V SHUTDOWN Pin High IH V SHUTDOWN Pin Low IL I SHUTDOWN Pin Input Current IH I SHUTDOWN Pin Input Current IL The denotes the specifications which apply over the ...

Page 4

LT1109 W U TYPICAL PERFOR A Minimum/Maximum Oscillator Frequency 160 150 140 130 120 110 100 90 80 2.5 4.0 5.5 6.0 2.0 3.0 3.5 4.5 ...

Page 5

U U LT1109 OPER The 8-pin versions of the LT1109 have separate pins for V and SENSE or FB and also have a SHUTDOWN pin. IN Separating the device V pin from the SENSE pin allows ...

Page 6

LT1109 PPLICATI FOR ATIO kept to 600mA or less. Higher switch currents will cause excessive drop across the switch resulting in reduced efficiency. In general, switch current should be held to as low a ...

Page 7

... SW V OUT 2 CELLS LT1109CZ-12 + GND Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights. ...

Page 8

... NOM Z3 1191 LT/GP 1093 5K REV B • PRINTED IN USA LINEAR TECHNOLOGY CORPORATION 1993 N8 0392 0.150 – 0.157 (3.810 – 3.988) SO8 0392 ...

Related keywords