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Linear Technology Electronic Components Datasheet

LT1111 Datasheet

Micropower DC/DC Converter

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FEATURES
s Operates at Supply Voltages from 2V to 30V
s Works with Surface Mount Inductors
s 72kHz Oscillator
s Only Three External Components Required
s Step-Up or Step-Down Mode
s Low-Battery Detector Comparator On-Chip
s User Adjustable Current Limit
s Internal 1A Power Switch
s Fixed or Adjustable Output Voltage Versions
s Space Saving 8-Pin MiniDIP or SO-8 Package
U
APPLICATIO S
s 3V to 5V, 5V to 12V Converters
s 9V to 5V, 12V to 5V Converters
s Remote Controls
s Peripherals and Add-On Cards
s Battery Backup Supplies
s Uninterruptible Supplies
s Laptop and Palmtop Computers
s Cellular Telephones
s Portable Instruments
s Flash Memory VPP Generators
LT1111
Micropower
DC/DC Converter
Adjustable and Fixed 5V, 12V
DESCRIPTIO
The LT®1111 is a versatile micropower DC/DC converter.
The device requires only three external components to
deliver a fixed output of 5V or 12V. Supply voltage ranges
from 2V to 12V in step-up mode and to 30V in step-down
mode. The LT1111 functions equally well in step-up, step-
down, or inverting applications.
The LT1111 oscillator is set at 72kHz, optimizing the
device to work with off-the-shelf surface mount inductors.
The device can deliver 5V at 100mA from a 3V input in
step-up mode or 5V at 200mA from a 12V input in step-
down mode.
Switch current limit can be programmed with a single
resistor. An auxiliary open-collector gain block can be
configured as a low-battery detector, linear post regulator,
undervoltage lock-out circuit, or error amplifier.
For input sources of less than 2V use the LT1110.
, LTC and LT are registered trademarks of Linear Technology Corporation
TYPICAL APPLICATIO
All Surface Mount 3V to 5V Step-Up Converter
3V INPUT
SUMIDA
CD54-220M
22µH
MBRS120T3
5V
100mA
ILIM V IN
+ SW1
10µF* LT1111CS8-5
SENSE
GND SW2
+
33 µ F
*OPTIONAL
LT1111 • TA01
Typical Load Regulation
6
5
4 VIN = 2V 2.2 2.4 2.6 2.8 3V
3
2
1
0
0 25
50 75 100 125 150 175 200
LOAD CURRENT (mA)
LT1111 • TA02
1111fd
1


Linear Technology Electronic Components Datasheet

LT1111 Datasheet

Micropower DC/DC Converter

No Preview Available !

LT1111
ABSOLUTE AXI U RATI GS (Note 1)
Supply Voltage (VIN) ............................................... 36V
SW1 Pin Voltage (VSW1) ......................................... 50V
SW2 Pin Voltage (VSW2) ............................ – 0.5V to VIN
Feedback Pin Voltage (LT1111) ............................. 5.5V
Switch Current ....................................................... 1.5A
Maximum Power Dissipation ............................ 500mW
Operating Temperature Range
LT1111C ............................................... 0°C to 70°C
LT1111I ......................................... – 40°C to 105°C
LT1111M (OBSOLETE) ............. – 55°C to 125°C
Storage Temperature Range ................ – 65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
PACKAGE/ORDER I FOR ATIO
ILIM 1
VIN 2
SW1 3
SW2 4
TOP VIEW
8 FB (SENSE)*
7 SET
6 A0
5 GND
ORDER PART
NUMBER
LT1111CN8
LT1111CN8-5
LT1111CN8-12
N8 PACKAGE
8-LEAD PLASTIC DIP
*FIXED VERSIONS
TJMAX = 90°C, θJA = 130°C/W (N)
J8 PACKAGE
8-LEAD CERAMIC DIP
TJMAX = 150°C, θJA = 120°C/W (J)
LT1111MJ8
LT1111MJ8-5
LT1111MJ8-12
OBSOLETE PACKAGE
Consider the N8 Package for Alternate Source
Consult LTC Marketing for parts specified with wider operating temperature ranges.
TOP VIEW
ILIM 1
VIN 2
SW1 3
SW2 4
8 FB (SENSE)*
7 SET
6 A0
5 GND
S8 PACKAGE
8-LEAD PLASTIC SO
*FIXED VERSION
TJMAX = 90°C, θJA = 150°C/W
ORDER PART
NUMBER
LT1111CS8
LT1111CS8-5
LT1111CS8-12
LT1111IS8
S8 PART MARKING
1111
11115
11111
1111I
ELECTRICAL CHARACTERISTICS The q denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C.VIN = 3V, Military or Commercial Version
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX
IQ Quiescent Current
VIN Input Voltage
Switch OFF
Step-Up Mode
Step-Down Mode
q 2.0
q
300 400
12.6
30.0
Comparator Trip Point Voltage
LT1111 (Note 2)
q 1.20 1.25 1.30
VOUT Output Sense Voltage
LT1111-5 (Note 3
LT1111-12 (Note 3)
q 4.75 5.00 5.25
q 11.40 12.00 12.60
Comparator Hysteresis
LT1111
q 8 12.5
Output Hysteresis
LT1111-5
LT1111-12
q 32 50
q 75 120
fOSC Oscillator Frequency
DC Duty Cycle: Step-Up Mode
Step-Down Mode
Full Load
54 72 88
43 50 59
24 34 50
tON Switch ON Time: Step-Up Mode
Step-Down Mode
VSAT SW Saturation Voltage, Step-Up Mode
SW Saturation Voltage, Step-Down Mode
ILIM Tied to VIN
VOUT, = 5V, VIN = 12V
VIN = 3.0V, ISW = 650mA
VIN = 5.0V, ISW = 1A
VIN = 12V, ISW = 650mA
579
3.3 5 7.8
0.5 0.65
0.8 1.0
1.1 1.5
UNITS
µA
V
V
V
V
V
mV
mV
mV
kHz
%
%
µs
µs
V
V
V
1111fd
2


Part Number LT1111
Description Micropower DC/DC Converter
Maker Linear Technology
Total Page 16 Pages
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