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LT1304 Datasheet Preview

LT1304 Datasheet

MICROPOWER DC/DC CONVERTERS

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LT1304 pdf
UTC LT1304/LT1304-3.3V/LT1304-5.0V
LINEAR INTEGRATED CIRCUIT
MICROPOWER DC/DC
CONVERTERS WITH
LOW-BATTERY DETECTOR
ACTIVE IN SHUTDOWN
DESCRIPTION
The UTC LT1304 is a micropower step-up DC/DC
converter ideal for use in small, low voltage,
battery-operated systems. The devices operate from a
wide input supply range of 1.5V to 8V.
The UTC LT1304-3.3 and LT1304-5.0 generate
regulated outputs of 3.3V and 5V and the adjustable
LT1304 can deliver output voltages up to
25V.Quiescent current,120 μ A in active mode,
decreases to just 10 μ A in shutdown with the
low-battery detector still active. Peak switch current,
internally set at 1A,can be reduced by adding a single
resistor from the ILIM pin to ground. The high speed
operation of the UTC LT1304 allows the use of small,
surface-mountable inductors and capacitors.
SOP-8
DIP-8
FEATURES
*5V at 200mA from two cells.
*10μA quiescent current in shutdown.
*Operates with VIN as low as1.5V
*Low battery detector active in shutdown
*Low switch VCESAT:370mV at 1A typical.
*120μA quiescent current in active mode.
*Switching frequency up to 300kHz
*Programmable peak current with one resistor.
.
www.DataSheet4AU.cPomPLICATIONS
*2-,3-,or 4-cell to 5V or 3.3V step-up
*Portable instruments
*Bar code scanners
*Palmtop computers
*Diagnostic medical instrumentation.
*Personal data communicators/computers.
PIN CONFIGURATION
LBI 1
LBO 2
VIN 3
SW 4
8 FB(SENSE)*
7 SHDN
6 IL I M
5 GND
UTC
UNISONIC TECHNOLOGIES CO., LTD. 1
QW-R103-018,A



UTC
UTC

LT1304 Datasheet Preview

LT1304 Datasheet

MICROPOWER DC/DC CONVERTERS

No Preview Available !

LT1304 pdf
UTC LT1304/LT1304-3.3V/LT1304-5.0V
LINEAR INTEGRATED CIRCUIT
ABSOLUTE MAXIMUM RATINGS
PARAMETER
SYMBOL
Input Voltage
VIN
SW Voltage
FB Voltage(LT1304)
ILIM Voltage(LT1304-3.3/LT1304-5.0)
SHDN Voltage
LBI Voltage
LBO Voltage
Maximum Power Dissipation
PD
Junction Temperature
Tj
Operating Temperature Range
Topr
Storage Temperature Range
Tstg
Lead Temperature (soldering,10sec)
RATING
8
-0.4 ~ +25
VIN+0.3
5
6
VIN
8
500
125
0 ~ 70
-65 ~ +150
300
UNIT
V
V
V
V
V
V
V
mW
°C
°C
°C
°C
ELECTRICAL CHARACTERISTICS (VIN=2V,VSHDN=2V Unless otherwise noted.)
PARAMETER
TEST CONDITIONS
MIN TYP
Minimum Operating Voltage
*
1.5
Operating Voltage Range
Quiescent Current
Quiescent Current In Shutdown
Comparator Trip Point
FB Pin Bias Current
Sense Pin Leakage in Shutdown
*
* VSHDN=2V,Not switching
* VSHDN=0V,VIN=2V
* VSHDN=0V,VIN=5V
*
*
* VSHDN=0V,Fixed Output Versions
120
7
27
1.22 1.24
10
0.002
Line Regulation
* 1.8VVIN8V
0.04
LBI Input Threshold
* Falling Edge
1.10 1.17
LBI Bias Current
*
6
LBI Input Hysteresis
*
35
LBO Output Voltage Low
* ISINK=500µA
0.2
LBO Output Leakage Current
SHDN Input Voltage High
SHDN Input Voltage Low
SHDN Pin Bias Current
* LBI=1.5V,LBO=5V
*
*
* V SHDN=5V
* V SHDN=0V
0.01
1.4
5
-5 -2
Switching Off Time
*
1 1.5
Switch On Time
* Current Limit Not Asserted
46
Maximum Duty Cycle
* Current Limit Not Asserted
76 80
Peak Switch Current
ILIM Pin Open,VIN=5V
20K from ILIM to GND
0.8 1
500
Switch Saturation Voltage
Isw=1A
* Isw=700mA
0.37
0.26
MAX
1.65
8
200
15
50
1.26
25
1
0.15
1.25
20
65
0.4
0.1
0.4
8
2
8
88
1.2
0.35
UTC UNISONIC TECHNOLOGIES CO., LTD.
UNIT
V
V
µA
µA
µA
V
nA
µA
%/V
V
nA
mV
V
µA
V
V
µA
µA
µs
µs
%
A
mA
V
V
2
QW-R103-018,A


Part Number LT1304
Description MICROPOWER DC/DC CONVERTERS
Maker UTC
Total Page 19 Pages
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LT1304 pdf
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