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LTC1844ES5-2.5#TRMPBF

P1-P3P4-P6P7-P9P10-P12
1
LTC1844 Series
1844fa
150mA, Micropower,
Low Noise, VLDO
Linear Regulator
■
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: 60µV
RMS
(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
Fixed Voltage Low Noise, VLDO Linear Regulator
■
Portable Instruments and Battery-Powered Systems
■
Bluetooth/802.11 Cards
■
Cellular Phones
■
PDAs and Notebook Computers
The LTC
®
1844 Series are low noise VLDO
TM
(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
30µV
RMS
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 (ThinSOT
TM
) package.
IN
SHDN
1844 TA01
1µF
LTC1844-3.3
OUT
V
OUT
3.3V
V
IN
3.3V TO 6.5V
BYP
GND
0.1µF
1µF
OFF ON
LTC1844-3.3 Dropout Voltage vs Load Current
I
OUT
(mA)
0
0
DROPOUT VOLTAGE (mV)
20
40
60
80
120
100
25
50 75 100
1844 TA02
125 150
DESCRIPTIO
U
FEATURES
APPLICATIO S
U
TYPICAL APPLICATIO
U
, 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.
2
LTC1844 Series
1844fa
(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
ABSOLUTE AXI U RATI GS
WWWU
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
IN
Input Voltage ● 1.6 6.5 V
I
IN
Quiescent Current SHDN = V
IN
35 55 µA
● 80 µA
I
INSHDN
V
IN
Shutdown Supply Current SHDN = 0V ● 0.01 1 µA
V
OUT%
Regulated Output Voltage LTC1844-3.3 V
IN
= 3.8V to 6.5V, I
OUT
= 0mA to 150mA –1.50 1.50 %V
OUT
(Notes 3, 4, 5) LTC1844-3.3 V
IN
= 3.8V to 6.5V, I
OUT
= 0mA to 150mA ● –1.75 1.75 %V
OUT
LTC1844-2.8 V
IN
= 3.3V to 6.5V, I
OUT
= 0mA to 150mA –1.50 1.50 %V
OUT
LTC1844-2.8 V
IN
= 3.3V to 6.5V, I
OUT
= 0mA to 150mA ● –1.75 1.75 %V
OUT
LTC1844-2.5 V
IN
= 3.0V to 6.5V, I
OUT
= 0mA to 150mA –1.50 1.50 %V
OUT
LTC1844-2.5 V
IN
= 3.0V to 6.5V, I
OUT
= 0mA to 150mA ● –1.75 1.75 %V
OUT
LTC1844-1.8 V
IN
= 2.3V to 6.5V, I
OUT
= 0mA to 150mA –1.50 1.50 %V
OUT
LTC1844-1.8 V
IN
= 2.3V to 6.5V, I
OUT
= 0mA to 150mA ● –1.75 1.75 %V
OUT
The ● denotes specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= V
OUT
+ 0.5V, unless otherwise noted. (Note 2)
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
PACKAGE/ORDER I FOR ATIO
UU
W
LTC1844ES5-1.5
LTC1844ES5-1.8
LTC1844ES5-2.5
LTC1844ES5-2.8
LTC1844ES5-3.3
ORDER PART
NUMBER
T
JMAX
= 125°C, θ
JA
= 250°C/ W, θ
JC
= 90°C/ W
SEE THE APPLICATIONS INFORMATION SECTION
S5 PART
MARKING
LTF1
LTF2
LTF3
LTQK
LTF4
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/
Consult LTC Marketing for parts specified with wider operating temperature ranges.
T
JMAX
= 125°C, θ
JA
= 250°C/ W, θ
JC
= 90°C/ W
SEE THE APPLICATIONS INFORMATION SECTION
T
JMAX
= 125°C, θ
JA
= 250°C/ W, θ
JC
= 90°C/ W
SEE THE APPLICATIONS INFORMATION SECTION
LTC1844ES5-SD
ORDER PART
NUMBER
S5 PART
MARKING
LTE8
LTC1844ES5-BYP
ORDER PART
NUMBER
S5 PART
MARKING
LTE9
5 OUT
4 ADJ
IN 1
GND 2
TOP VIEW
S5 PACKAGE
5-LEAD PLASTIC TSOT-23
SHDN 3
5 OUT
4 ADJ
IN 1
GND 2
TOP VIEW
S5 PACKAGE
5-LEAD PLASTIC TSOT-23
BYP 3
5 OUT
4 BYP
IN 1
GND 2
TOP VIEW
S5 PACKAGE
5-LEAD PLASTIC TSOT-23
SHDN 3
3
LTC1844 Series
1844fa
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
LTC1844-1.5 V
IN
= 2.0V to 6.5V, I
OUT
= 0mA to 150mA –1.50 1.50 %V
OUT
LTC1844-1.5 V
IN
= 2.2V to 6.5V, I
OUT
= 0mA to 150mA ● –2.00 2.00 %V
OUT
LTC1844-1.5 V
IN
= 2.0V to 6.5V, I
OUT
= 0mA to 100mA ● –2.50 2.00 %V
OUT
LTC1844-BYP V
IN
= 1.75V to 6.5V, I
OUT
= 0mA to 150mA –1.50 1.50 %V
OUT
LTC1844-BYP V
IN
= 2.2V to 6.5V, I
OUT
= 0mA to 150mA ● –1.75 1.75 %V
OUT
LTC1844-BYP V
IN
= 1.75V to 6.5V, I
OUT
= 0mA to 100mA ● –3.50 1.75 %V
OUT
LTC1844-SD V
IN
= 1.75V to 6.5V, I
OUT
= 0mA to 150mA –1.50 1.50 %V
OUT
LTC1844-SD V
IN
= 2.2V to 6.5V, I
OUT
= 0mA to 150mA ● –1.75 1.75 %V
OUT
LTC1844-SD V
IN
= 1.75V to 6.5V, I
OUT
= 0mA to 100mA ● –3.50 1.75 %V
OUT
V
ADJ
ADJ Pin Voltage (Notes 3, 5) LTC1844-BYP V
IN
= 1.75V to 6.5V, I
OUT
= 0mA to 150mA 1.233 1.25 1.271 V
LTC1844-BYP V
IN
= 2.2V to 6.5V, I
OUT
= 0mA to 150mA ● 1.230 1.274 V
LTC1844-BYP V
IN
= 1.75V to 6.5V, I
OUT
= 0mA to 100mA ● 1.208 1.274 V
LTC1844-SD V
IN
= 1.75V to 6.5V, I
OUT
= 0mA to 150mA 1.233 1.25 1.271 V
LTC1844-SD V
IN
= 2.2V to 6.5V, I
OUT
= 0mA to 150mA ● 1.230 1.274 V
LTC1844-SD V
IN
= 1.75V to 6.5V, I
OUT
= 0mA to 100mA ● 1.208 1.274 V
∆V
LNR
Line Regulation (Notes 3, 5) LTC1844-3.3 V
IN
= 3.4V to 6.5V, I
L
= 1mA ● 420 mV
LTC1844-2.8 V
IN
= 2.9V to 6.5V, I
L
= 1mA ● 420 mV
LTC1844-2.5 V
IN
= 2.6V to 6.5V, I
L
= 1mA ● 420 mV
LTC1844-1.8 V
IN
= 2.2V to 6.5V, I
L
= 1mA ● 420 mV
V
IN
= 1.9V to 6.5V, I
L
= 1mA 4 20 mV
V
IN
= 1.9V to 6.5V, I
L
= 1mA ● 430 mV
LTC1844-1.5 V
IN
= 2.2V to 6.5V, I
L
= 1mA ● 420 mV
V
IN
= 1.6V to 6.5V, I
L
= 1mA 4 20 mV
V
IN
= 1.6V to 6.5V, I
L
= 1mA ● 480 mV
LTC1844-BYP V
IN
= 2.2V to 6.5V, I
L
= 1mA ● 420 mV
V
IN
= 1.6V to 6.5V, I
L
= 1mA 4 20 mV
V
IN
= 1.6V to 6.5V, I
L
= 1mA ● 480 mV
LTC1844-SD V
IN
= 2.2V to 6.5V, I
L
= 1mA ● 420 mV
V
IN
= 1.6V to 6.5V, I
L
= 1mA 4 20 mV
V
IN
= 1.6V to 6.5V, I
L
= 1mA ● 480 mV
∆V
LDR
Load Regulation (Notes 3, 5) LTC1844-3.3 V
IN
= 3.8V, I
OUT
= 0mA to 150mA ● 920 mV
LTC1844-2.8 V
IN
= 3.3V, I
OUT
= 0mA to 150mA ● 920 mV
LTC1844-2.5 V
IN
= 3.0V, I
OUT
= 0mA to 150mA ● 920 mV
LTC1844-1.8 V
IN
= 2.3V, I
OUT
= 0mA to 150mA ● 920 mV
LTC1844-1.5 V
IN
= 2.2V, I
OUT
= 0mA to 150mA ● 920 mV
V
IN
= 2.0V, I
OUT
= 0mA to 100mA ● 940 mV
LTC1844-BYP V
IN
= 2.2V, I
OUT
= 0mA to 150mA ● 920 mV
V
IN
= 1.75V, I
OUT
= 0mA to 100mA ● 950 mV
LTC1844-SD V
IN
= 2.2V, I
OUT
= 0mA to 150mA ● 920 mV
V
IN
= 1.75V, I
OUT
= 0mA to 100mA ● 950 mV
∆V
DO
Dropout Voltage (Notes 6, 7) LTC1844-3.3 I
OUT
= 50mA ● 30 55 mV
I
OUT
= 150mA ● 90 150 mV
LTC1844-2.8 I
OUT
= 50mA ● 35 60 mV
I
OUT
= 150mA ● 105 165 mV
LTC1844-2.5 I
OUT
= 50mA ● 45 75 mV
I
OUT
= 150mA ● 135 200 mV
LTC1844-1.8 I
OUT
= 50mA ● 85 120 mV
I
OUT
= 150mA ● 230 300 mV
ELECTRICAL CHARACTERISTICS
The ● denotes specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= V
OUT
+ 0.5V, unless otherwise noted. (Note 2)
P1-P3P4-P6P7-P9P10-P12

LTC1844ES5-2.5#TRMPBF

Mfr. #:
Buy LTC1844ES5-2.5#TRMPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
LDO Voltage Regulators 2.5V, Micropower, Low Noise VLDO Regulator
Lifecycle:
New from this manufacturer.
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