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Linear Technology Electronic Components Datasheet

LT1073 Datasheet

Micropower DC-DC Converter Ajustable and Fixed 5V / 12V

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FEATURES
s No Design Required
s Operates at Supply Voltages from 1V to 30V
s Consumes Only 95µA Supply Current
s Works in Step-Up or Step-Down Mode
s Only Three External Off-the-Shelf Components
Required
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 PDIP or SO-8 Package
U
APPLICATIO S
s Pagers
s Cameras
s Single-Cell to 5V Converters
s Battery Backup Supplies
s Laptop and Palmtop Computers
s Cellular Telephones
s Portable Instruments
s 4mA to 20mA Loop Powered Instruments
s Hand-Held Inventory Computers
s Battery-Powered α, β, and γ Particle Detectors
LT1073
Micropower
DC/DC Converter
Adjustable and Fixed 5V, 12V
DESCRIPTIO
The LT®1073 is a versatile micropower DC/DC converter.
The device requires only three external components to
deliver a fixed output of 5V or 12V. The very low minimum
supply voltage of 1V allows the use of the LT1073 in
applications where the primary power source is a single
cell. An on-chip auxiliary gain block can function as a low-
battery detector or linear post-regulator.
Average current drain of the LT1073-5 used as shown in
the Typical Application circuit below is just 135µA un-
loaded, making it ideal for applications where long battery
life is important. The circuit shown can deliver 5V at 40mA
from an input as low as 1.25V and 5V at 10mA from a 1V
input.
The device can easily be configured as a step-up or step-
down converter, although for most step-down applica-
tions or input sources greater than 3V, the LT1173 is
recommended. Switch current limiting is user-adjustable
by adding a single external resistor. Unique reverse-
battery protection circuitry limits reverse current to safe,
nondestructive levels at reverse supply voltages up to
1.6V.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATION
Single-Cell to 5V Converter
CADDELL-BURNS
7300-12
82µH 1N5818
5V
40mA
12
ILIM VIN
1.5V SW1 3
AA CELL* LT1073-5
SENSE 8
GND SW2
54
+ 100µF
SANYO
0S-CON
OPERATES WITH CELL VOLTAGE 1V
*ADD 10µF DECOUPLING CAPACITOR IF
BATTERY IS MORE THAN 2" AWAY FROM LT1073
1073 TA01
Single Alkaline “AA” Cell Operating
Hours vs DC Load Current
1000
100
10
1
1
L = 180µH
L = 82µH
10
LOAD CURRENT (mA)
100
LT1073 TA02
1


Linear Technology Electronic Components Datasheet

LT1073 Datasheet

Micropower DC-DC Converter Ajustable and Fixed 5V / 12V

No Preview Available !

LT1073
ABSOLUTE AXI U RATI GS
(Note 1)
Supply Voltage, Step-Up Mode ................................ 15V
Supply Voltage, Step-Down Mode ........................... 36V
SW1 Pin Voltage ...................................................... 50V
SW2 Pin Voltage ........................................... –0.4 to VIN
Feedback Pin Voltage (LT1073) ................................. 5V
Switch Current ........................................................ 1.5A
Maximum Power Dissipation ............................. 500mW
Operating Temperature Range ..................... 0°C to 70°C
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
UW U
PACKAGE/ORDER I FOR ATIO
TOP VIEW
ORDER PART
NUMBER
ILIM 1
VIN 2
SW1 3
SW2 4
8 FB (SENSE)*
7 SET
6 A0
5 GND
N8 PACKAGE
8-LEAD PDIP
S8 PACKAGE
8-LEAD PLASTIC SO
*FIXED VERSIONS
TJMAX = 125°C, θJA = 100°C/W (N8)
TJMAX = 125°C, θJA = 120°C/W (S8)
LT1073CN8
LT1073CN8-5
LT1073CN8-12
LT1073CS8
LT1073CS8-5
LT1073CS8-12
S8 PART MARKING
1073
10735
107312
Consult factory for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS The q denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 1.5V unless otherwise specified.
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
IQ Quiescent Current
Switch Off
q
95 130
µA
IQ
Quiescent Current, Step-Up
No Load
LT1073-5
Mode Configuration
LT1073-12
135 µA
250 µA
VIN Input Voltage
Step-Up Mode
q 1.15
1.0
12.6 V
12.6 V
Step-Down Mode
q 30 V
Comparator Trip Point Voltage
LT1073 (Note 2)
q 202 212 222
mV
VOUT Output Sense Voltage
LT1073-5 (Note 3)
LT1073-12 (Note 3)
q 4.75 5 5.25
q 11.4 12 12.6
V
V
Comparator Hysteresis
LT1073
q
5 10
mV
Output Hysteresis
LT1073-5
LT1073-12
q
125 250
mV
q
300 600
mV
fOSC
DC
tON
IFB
ISET
VAO
VCESAT
Oscillator Frequency
Duty Cycle
Switch ON Time
Feedback Pin Bias Current
Set Pin Bias Current
AO Output Low
Reference Line Regulation
Switch Saturation Voltage
Set-Up Mode
Full Load (VFB = VREF)
LT1073, VFB = 0V
VSET = VREF
IAO = –100µA
1V VIN 1.5V
1.5V VIN 12V
VIN = 1.5V, ISW = 400mA
q 15
q 65
q 30
q
q
q
q
q
q
19 23
72 80
38 50
10 50
60 120
0.15 0.4
0.35 1.0
0.05 0.1
300 400
600
kHz
%
µs
nA
nA
V
%V
%V
mV
mV
VIN = 1.5V, ISW = 500mA
400 550
mV
q 750 mV
VIN = 5V, ISW = 1A
700 1000
mV
q 1500 mV
AV A2 Error Amp Gain
RL = 100k(Note 4)
q 400 1000
V/V
2


Part Number LT1073
Description Micropower DC-DC Converter Ajustable and Fixed 5V / 12V
Maker Linear Technology
Total Page 16 Pages
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