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Linear Technology Electronic Components Datasheet

LT1107 Datasheet

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

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LT1107
Micropower
DC/DC Converter
Adjustable and Fixed 5V, 12V
FEATURES
s Operates at Supply Voltages from 2V to 30V
s Consumes Only 320µA Supply Current
s Works in Step-Up or Step-Down Mode
s Only Three External 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 SO-8 Package
APPLICATI S
s Palmtop Computers
s 3V to 5V, 5V to 12V Converters
s 24V to 5V, 12V to 5V Converters
s LCD Bias Generators
s Peripherals and Add-On Cards
s Battery Backup Supplies
s Cellular Telephones
s Portable Instruments
DESCRIPTIO
The LT1107 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 LT1107 functions equally well in step-up, step-
down, or inverting applications.
The LT1107 is pin-for-pin compatible with the LT1111, but
has a duty cycle of 70%, resulting in increased output
current in many applications. The LT1107 can deliver
150mA at 5V from a 2AA cell input and 5V at 300mA from
24V in step-down mode. Quiescent current is just 320µA,
making the LT1107 ideal for power-conscious battery-
operated systems. The 63kHz oscillator is optimized to
work with surface mount inductors and capacitors.
Switch current limit can be programmed with a single
resistor. An auxiliary gain block can be configured as a
low-battery detector, linear post regulator, undervoltage
lock-out circuit, or error amplifier.
TYPICAL APPLICATI
Palmtop Computer Logic Supply
L1*
33µH MBRS120T3
2 × AA
ALKALINE CELLS
47
ILIM VIN
+ SW1
47µF
LT1107-5
SENSE
GND SW2
5V
150mA
+
100µF
* SUMIDA CD54-330K
COILCRAFT DT3316-473
1107 TA01
Efficiency
82
80 VIN = 3V
78
76 VIN = 2V
VIN = 2.5V
74
72
70
68
66
64
1
10 100 400
LOAD CURRENT (mA)
1107 TA02
1


Linear Technology Electronic Components Datasheet

LT1107 Datasheet

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

No Preview Available !

LT1107
ABSOLUTE AXI U RATI GS
Supply Voltage (VIN) ............................................... 36V
SW1 Pin Voltage (VSW1) ......................................... 50V
SW2 Pin Voltage (VSW2) ............................ – 0.5V to VIN
Feedback Pin Voltage (LT1107) ................................ 5V
Sense Pin Voltage (LT1107-5, LT1107-12) ............ 36V
Maximum Power Dissipation ............................ 500mW
Set Pin Voltage ...................................................... 5.5V
Maximum Switch Current ...................................... 1.5A
Operating Temperature Range
LT1107C ................................................ 0°C to 70°C
LT1107M ........................................ – 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
TOP VIEW
ILIM 1
VIN 2
SW1 3
SW2 4
8 FB (SENSE)*
7 SET
6 AO
5 GND
J8 PACKAGE
N8 PACKAGE
8-LEAD CERAMIC DIP 8-LEAD PLASTIC DIP
* FIXED VERSIONS
TJMAX = 150°C, θJA = 120°C/W (J)
TJMAX = 90°C, θJA = 130°C/W (N)
ORDER PART
NUMBER
LT1107CN8
LT1107CN8-5
LT1107CN8-12
LT1107MJ8
LT1107MJ8-5
LT1107MJ8-12
TOP VIEW
ILIM 1
VIN 2
SW1 3
SW2 4
8 FB(SENSE)*
7 SET
6 AO
5 GND
S8 PACKAGE
8-LEAD PLASTIC SO
*FIXED VERSIONS
TJMAX = 90°C, θJA = 150°C/W
ORDER PART
NUMBER
LT1107CS8
LT1107CS8-5
LT1107CS8-12
S8 PART MARKING
1107
11075
110712
ELECTRICAL CHARACTERISTICS
VIN = 3V, military or commercial version, TA = 25°C, unless otherwise noted.
SYMBOL
IQ
PARAMETER
Quiescent Current
Quiescent Current, Step-Up Mode Configuration
VIN Input Voltage
Comparator Trip Point Voltage
VOUT Output Sense Voltage
Comparator Hysteresis
Output Hysteresis
fOSC Oscillator Frequency
Duty Cycle, Step-Up Mode
tON Switch ON Time, Step-Up Mode
Feedback Pin Bias Current
Set Pin Bias Current
VOL Gain Block Output Low
Reference Line Regulation
CONDITIONS
MIN TYP MAX
Switch OFF
320 450
No Load
LT1107-5
LT1107-12
360
550
Step-Up Mode
Step-Down Mode
q2
q
12.6
30.0
LT1107 (Note 1)
q 1.2 1.25 1.3
LT1107-5 (Note 2)
LT1107-12 (Note 2)
q 4.75 5
5.25
q 11.40 12 12.60
LT1107
q 8 12.5
LT1107-5
LT1107-12
q 32 50
q 75 120
50 63 77
Full Load
64 70 76
ILIM Tied to VIN
LT1107, VFB = 0V
VSET = VREF
ISINK = 300µA, VSET = 1V
5V VIN 30V
8.8 11 12.7
q 70 120
q 70 300
q 0.15 0.4
q 0.02 0.075
UNITS
µA
µA
µA
V
V
V
V
V
mV
mV
mV
kHz
%
µs
nA
nA
V
%/V
2


Part Number LT1107
Description Micropower DC/DC Converter Adjustable and Fixed 5V/ 12V
Maker Linear Technology
Total Page 12 Pages
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