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Linear Technology Electronic Components Datasheet

LTC1844 Datasheet

150mA/ Micropower/ Low Noise/ VLDO Linear Regulator

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LTC1844 pdf
FEATURES
Very Low Dropout:
90mV at 150mA
30mV at 50mA (LTC1844-3.3)
Wide Input Voltage Range: 1.6V to 6.5V
Low 35µA Supply Current, Even in Dropout
Low Noise: 60µVRMS (10Hz to 100kHz)
±1.75% Voltage Accuracy Over Temperature,
Voltage and Current Ranges
Fast Transient Response
10nA Supply Current in Shutdown
Fixed Output Voltages: 1.5V, 1.8V, 2.5V, 2.8V, 3.3V
Adjustable Output Voltage: 1.25V to 6V
Output Current Limit
Reverse-Battery and Reverse-Current Protection
No Protection Diodes Needed
Stable with 1µF Output Capacitor
Stable with Ceramic Capacitors
Short-Circuit and Thermal Overload Protection
Low Profile (1mm) SOT-23 Package
U
APPLICATIO S
Portable Instruments and Battery-Powered Systems
Bluetooth/802.11 Cards
Cellular Phones
PDAs and Notebook Computers
LTC1844 Series
150mA, Micropower,
Low Noise, VLDO
Linear Regulator
DESCRIPTIO
The LTC®1844 Series are low noise VLDOTM (very low
dropout) linear regulators designed for low power/portable
applications. These regulators can operate from input
voltages as low as 1.6V. Typical output noise is only
30µVRMS and typical dropout for the LTC1844-3.3 is just
90mV at the maximum load current of 150mA, reducing to
30mV at 50mA.
The internal P-channel MOSFET pass transistor requires
no base current, allowing the device to draw only 35µA
during normal operation, independent of the dropout
voltage and load current. The quiescent current falls to a
negligible 10nA during shutdown.
Other features include high output voltage accuracy,
excellent transient response, stability with ultralow ESR
ceramic capacitors as small as 1µF, reverse-battery and
reverse-current protection, short-circuit and thermal
overload protection and output current limiting.
The LTC1844 regulators are available in a low profile
(1mm) SOT-23 (ThinSOTTM) package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
VLDO and ThinSOT are trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATIO
Fixed Voltage Low Noise, VLDO Linear Regulator
VIN
3.3V TO 6.5V
OFF ON
IN OUT
1µF
LTC1844-3.3
SHDN BYP
GND
VOUT
3.3V
1µF
0.1µF
1844 TA01
LTC1844-3.3 Dropout Voltage vs Load Current
120
100
80
60
40
20
0
0 25 50 75 100 125 150
IOUT (mA)
1844 TA02
1844fa
1


Linear Technology Electronic Components Datasheet

LTC1844 Datasheet

150mA/ Micropower/ Low Noise/ VLDO Linear Regulator

No Preview Available !

LTC1844 pdf
LTC1844 Series
ABSOLUTE AXI U RATI GS (Note 1)
Supply Voltage (IN) ....................................... – 7V to 7V
Input Voltage
SHDN, BYP, ADJ .................................... – 0.3V to 7V
Output Voltage
OUT ........................................................ – 0.3V to 7V
OUT to IN .................................................. – 7V to 7V
Output Short-Circuit Duration ......................... Indefinite
Operating Junction Temperature Range
(Notes 2, 10) .....................................–40°C to 125°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
TOP VIEW
IN 1
GND 2
SHDN 3
5 OUT
4 BYP
IN 1
GND 2
SHDN 3
5 OUT
4 ADJ
S5 PACKAGE
5-LEAD PLASTIC TSOT-23
TJMAX = 125°C, θJA = 250°C/ W, θJC = 90°C/ W
SEE THE APPLICATIONS INFORMATION SECTION
S5 PACKAGE
5-LEAD PLASTIC TSOT-23
TJMAX = 125°C, θJA = 250°C/ W, θJC = 90°C/ W
SEE THE APPLICATIONS INFORMATION SECTION
ORDER PART
NUMBER
S5 PART
MARKING
ORDER PART
NUMBER
LTC1844ES5-1.5
LTC1844ES5-1.8
LTC1844ES5-2.5
LTC1844ES5-2.8
LTC1844ES5-3.3
LTF1
LTF2
LTF3
LTQK
LTF4
LTC1844ES5-SD
Order Options Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking: http://www.linear.com/leadfree/
S5 PART
MARKING
LTE8
Consult LTC Marketing for parts specified with wider operating temperature ranges.
TOP VIEW
IN 1
GND 2
BYP 3
5 OUT
4 ADJ
S5 PACKAGE
5-LEAD PLASTIC TSOT-23
TJMAX = 125°C, θJA = 250°C/ W, θJC = 90°C/ W
SEE THE APPLICATIONS INFORMATION SECTION
ORDER PART
NUMBER
LTC1844ES5-BYP
S5 PART
MARKING
LTE9
ELECTRICAL CHARACTERISTICS The denotes specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = VOUT + 0.5V, unless otherwise noted. (Note 2)
SYMBOL
VIN
IIN
PARAMETER
Input Voltage
Quiescent Current
IINSHDN
VOUT%
VIN Shutdown Supply Current
Regulated Output Voltage
(Notes 3, 4, 5)
CONDITIONS
SHDN = VIN
SHDN = 0V
LTC1844-3.3
LTC1844-3.3
LTC1844-2.8
LTC1844-2.8
LTC1844-2.5
LTC1844-2.5
LTC1844-1.8
LTC1844-1.8
VIN = 3.8V to 6.5V, IOUT = 0mA to 150mA
VIN = 3.8V to 6.5V, IOUT = 0mA to 150mA
VIN = 3.3V to 6.5V, IOUT = 0mA to 150mA
VIN = 3.3V to 6.5V, IOUT = 0mA to 150mA
VIN = 3.0V to 6.5V, IOUT = 0mA to 150mA
VIN = 3.0V to 6.5V, IOUT = 0mA to 150mA
VIN = 2.3V to 6.5V, IOUT = 0mA to 150mA
VIN = 2.3V to 6.5V, IOUT = 0mA to 150mA
MIN
1.6
–1.50
–1.75
–1.50
–1.75
–1.50
–1.75
–1.50
–1.75
TYP
35
0.01
MAX
6.5
55
80
1
1.50
1.75
1.50
1.75
1.50
1.75
1.50
1.75
2
UNITS
V
µA
µA
µA
%VOUT
%VOUT
%VOUT
%VOUT
%VOUT
%VOUT
%VOUT
%VOUT
1844fa


Part Number LTC1844
Description 150mA/ Micropower/ Low Noise/ VLDO Linear Regulator
Maker Linear Technology
Total Page 12 Pages
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