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Linear Technology Electronic Components Datasheet

LT1110 Datasheet

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

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FEATURES
s Operates at Supply Voltages From 1.0V to 30V
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 MiniDIP or S8 Package
APPLICATI 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 Laser Diode Drivers
s Hand-Held Inventory Computers
LT1110
Micropower
DC-DC Converter
Adjustable and Fixed 5V, 12V
DESCRIPTIO
The LT1110 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 1.0V allows the use of the LT1110 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.
The 70kHz oscillator allows the use of surface mount
inductors and capacitors in many applications. Quiescent
current is just 300µA, making the device ideal in remote or
battery powered applications where current consumption
must be kept to a minimum.
The device can easily be configured as a step-up or
step-down converter, although for most step-down
applications or input sources greater than 3V, the LT1111
is recommended. Switch current limiting is user-adjustable
by adding a single external resistor. Unique reverse battery
protection circuitry limits reverse current to safe, non-
destructive levels at reverse supply voltages up to 1.6V.
TYPICAL APPLICATI
All Surface Mount
Single Cell to 5V Converter
SUMIDA
CD54-470K
47µH
MBRS120T3
1.5V
AA CELL*
12
ILIM V IN
SW1
3
LT1110-5
SENSE
GND SW2 8
54
+
5V
15µF
TANTALUM
OPERATES WITH CELL VOLTAGE 1.0V
*ADD 10µF DECOUPLING CAPACITOR IF BATTERY
IS MORE THAN 2" AWAY FROM LT1110.
LT1110 • TA01
Efficiency
90
85
80 VIN = 1.50V
75 VIN = 1.25V
70 VIN = 1.00V
65
60
55
50
0 5 10 15 20 25 30 35 40
LOAD CURRENT (mA)
LT1110 • TA02
1


Linear Technology Electronic Components Datasheet

LT1110 Datasheet

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

No Preview Available !

LT1110
ABSOLUTE AXI U RATI GS
Supply Voltage, Step-Up Mode ................................ 15V
Supply Voltage, Step-Down Mode ........................... 36V
SW1 Pin Voltage ...................................................... 50V
SW2 Pin Voltage ......................................... – 0.5V to VIN
Feedback Pin Voltage (LT1110) .............................. 5.5V
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
PACKAGE/ORDER I FOR ATIO
TOP VIEW
ILIM 1
VIN 2
SW1 3
SW2 4
8 FB (SENSE)*
7 SET
6 A0
5 GND
N8 PACKAGE
8-LEAD PLASTIC DIP
*FIXED VERSIONS
TJMAX = 90°C, θJA = 130°C/W
ORDER PART
NUMBER
LT1110CN8
LT1110CN8-5
LT1110CN8-12
ILIM 1
VIN 2
SW1 3
SW2 4
TOP VIEW
LT1110CS8
8 FB (SENSE)* LT1110CS8-5
7 SET
LT1110CS8-12
6 A0
5 GND
S8 PART MARKING
S8 PACKAGE
8-LEAD PLASTIC SOIC
*FIXED VERSIONS
TJMAX = 90°C, θJA = 150°C/W
1110
11105
11012
Consult factory for Industrial and Military grade parts.
ELECTRICAL CHARACTERISTICS TA = 25°C, VIN = 1.5V, unless otherwise noted.
SYMBOL
IQ
VIN
VOUT
fOSC
DC
tON
IFB
ISET
VAO
PARAMETER
CONDITIONS
MIN
Quiescent Current
Switch Off
q
Input Voltage
Step-Up Mode
q 1.15
1.0
Step-Down Mode
q
Comparator Trip Point Voltage
LT1110 (Note 1)
q 210
Output Sense Voltage
LT1110-5 (Note 2)
q 4.75
LT1110-12 (Note 2)
q 11.4
Comparator Hysteresis
LT1110
q
Output Hysteresis
LT1110-5
q
LT1110-12
q
Oscillator Frequency
q 52
Duty Cycle
Switch ON Time
Full Load (VFB < VREF)
q 62
q 7.5
Feedback Pin Bias Current
Set Pin Bias Current
AO Output Low
Reference Line Regulation
LT1110, VFB = 0V
VSET = VREF
IAO = –300µA, VSET = 150mV
1.0V VIN 1.5V
1.5V VIN 12V
q
q
q
q
q
TYP
300
220
5.00
12.00
4
90
200
70
69
10
70
100
0.15
0.35
0.05
MAX
12.6
12.6
30
230
5.25
12.6
8
180
400
90
78
12.5
150
300
0.4
1.0
0.1
UNITS
µA
V
V
V
mV
V
V
mV
mV
mV
kHz
%
µs
nA
nA
V
%/V
%/V
2


Part Number LT1110
Description Micropower DC-DC Converter Adjustable and Fixed 5V/ 12V
Maker Linear Technology
Total Page 16 Pages
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