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PDF LT3022-1.8 Data sheet ( Hoja de datos )
| Número de pieza | LT3022-1.8 | |
| Descripción | Very Low Dropout Linear Regulator | |
| Fabricantes | Linear | |
| Logotipo |  |
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FEATURES
n VIN Range: 0.9V to 10V
n Dropout Voltage: 145mV Typical
n Output Current: 1A
n Adjustable Output (VREF = VOUT(MIN) = 200mV)
n Fixed Output Voltages: 1.2V, 1.5V, 1.8V
n Stable with Low ESR, Ceramic Output Capacitors
(10µF Minimum)
n 0.05% Typical Load Regulation from 1mA to 1A
n Quiescent Current: 400µA Typical
n 7.5µA Typical Quiescent Current in Shutdown
n Current Limit Protection
n Reverse-Battery Protection with No Reverse Current
n Thermal Limiting with Hysteresis
n 16-Lead (5mm × 3mm) DFN and MSOP Packages
APPLICATIONS
n High Efficiency Linear Regulators
n Battery-Powered Systems
n Logic Supplies
n Post Regulator for Switching Supplies
n Wireless Modems
n FPGA Core Supplies
LT3022/LT3022-1.2
LT3022-1.5/LT3022-1.8
1A, 0.9V to 10V,
Very Low Dropout
Linear Regulator
DESCRIPTION
The LT®3022 is a very low dropout voltage (VLDO™) linear
regulator that operates from single input supplies down to
0.9V. The device supplies 1A output current with 145mV
typical dropout voltage. The LT3022 is ideal for low input
voltage to low output voltage applications, providing
comparable electrical efficiency to a switching regulator.
The regulator optimizes stability and transient response
with low ESR ceramic output capacitors as small as 10µF.
Other LT3022 features include 0.05% typical line regulation
and 0.05% typical load regulation. In shutdown, quiescent
current typically drops to 7.5µA. Internal protection circuitry
includes reverse-battery protection, current limiting, ther-
mal limiting with hysteresis and reverse-current protection.
The LT3022 is available as an adjustable device with
an output voltage range down to the 200mV reference.
Three fixed output voltages, 1.2V, 1.5V and 1.8V are also
offered. The LT3022 regulator is available in the thermally
enhanced low profile (0.75mm) 16-lead (5mm × 3mm)
DFN and MSOP packages.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. VLDO is a trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
1.2V to 0.9V, 1A VLDO Regulator
VIN
1.2V
IN OUT
10µF LT3022
698Ω
1%
VOUT
0.9V
10µF 1A
SHDN ADJ
GND
200Ω
1%
3022 TA01a
Minimum Input Voltage
1.1
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
–50
–25
IL = 1A
0 25 50 75
TEMPERATURE (°C)
100 125
3022 TA01b
3022fb
1
1 page  
LT3022/LT3022-1.2
LT3022-1.5/LT3022-1.8
E LECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C.
PARAMETER
CONDITIONS
MIN TYP MAX
Ripple Rejection (Note 13)
Current Limit (Note 9)
Input Reverse Leakage Current (Note 14)
Reverse Output Current (Notes 15, 16)
Minimum Required Output Current
LT3022 VIN – VOUT = 1V, VRIPPLE = 0.5VP-P ,
fRIPPLE = 120Hz, ILOAD = 1A
55 70
LT3022-1.2 VIN – VOUT = 1V, VRIPPLE = 0.5VP-P ,
fRIPPLE = 120Hz, ILOAD = 1A
51 66
LT3022-1.5 VIN – VOUT = 1V, VRIPPLE = 0.5VP-P ,
fRIPPLE = 120Hz, ILOAD = 1A
51 66
LT3022-1.8 VIN – VOUT = 1V, VRIPPLE = 0.5VP-P ,
fRIPPLE = 120Hz, ILOAD = 1A
51 66
VIN = 10V, VOUT = 0V
VIN = VOUT(NOMINAL) + 0.5V, ∆VOUT ≤ –5%
l 1.1
2.6
1.7
VIN = –10V, VOUT = 0V
4 40
LT3022 VOUT = 1.2V, VIN = 0V
LT3022-1.2 VOUT = 1.2V, VIN = 0V
LLTT33002222--11..58 VVOOUUTT
=
=
1.5V,
1.8V,
VVIINN
=
=
0V
0V
0.1 5
0.1 5
0.1 5
0.1 5
VIN = 1.6V, VOUT = 1.2V
l1
UNITS
dB
dB
dB
dB
A
A
µA
µA
µA
µA
µA
mA
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: The LT3022 regulator is tested and specified under pulse load
conditions such that TJ ≈ TA. The LT3022 is 100% tested at TA = 25°C.
Performance of the LT3022E over the full –40°C and 125°C operating
junction temperature range is assured by design, characterization and
correlation with statistical process controls. The LT3022I regulators are
guaranteed over the full –40°C to 125°C operating junction temperature
range. High junction temperatures degrade operating lifetime. Operating
lifetime is derated at junction temperatures greater than 125°C.
Note 3: This IC includes overtemperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperature will exceed 125°C when overtemperature protection is active.
Continuous operation above the specified maximum operating junction
temperature may impair device reliability.
Note 4: Minimum input voltage is the voltage required by the LT3022 to
regulate the output voltage and supply the rated 1A output current. This
specification is tested at VOUT = 0.2V. For higher output voltages, the
minimum input voltage required for regulation equals the regulated output
voltage VOUT plus the dropout voltage or 1.1V, whichever is greater.
Note 5: Maximum junction temperature limits operating conditions. The
regulated output voltage specification does not apply for all possible
combinations of input voltage and output current. Limit the output current
range if operating at maximum input voltage. Limit the input-to-output
voltage differential range if operating at maximum output current.
Note 6: The LT3022 typically supplies 1A output current with a 0.9V input
supply. The guaranteed minimum input voltage for 1A output current is
1.10V, especially if cold temperature operation is required.
Note 7: The LT3022 is tested and specified for these conditions with ADJ
tied to OUT. Specifications for fixed output voltage devices are referred to
the output voltage.
Note 8: Dropout voltage is the minimum input to output voltage differential
needed to maintain regulation at a specified output current. In dropout the
output voltage equals: (VIN – VDROPOUT).
Note 9: The LT3022 is tested and specified for these conditions with
an external resistor divider (3.92k and 19.6k) setting VOUT to 1.2V. The
external resistor divider adds 50µA of load current.
Note 10: GND pin current is tested with VIN = VOUT(NOMINAL) + 0.4V and a
current source load. GND pin current increases in dropout. See GND pin
current curves in the Typical Performance Characteristics section.
Note 11: Adjust pin bias current flows out of the ADJ pin.
Note 12: Shutdown pin current flows into the SHDN pin.
Note 13: The LT3022 is tested and specified for this condition with an
external resistor divider (3.92k and 5.9k) setting VOUT to 0.5V. The external
resistor divider adds 50µA of load current. The specification refers to
the change in the 0.2V reference voltage, not the 0.5V output voltage.
Specifications for fixed output voltage devices are referred to the output
voltage.
Note 14: Input reverse leakage current flows out of the IN pin.
Note 15: Reverse output current is tested with IN grounded and OUT
forced to the rated output voltage. This current flows into the OUT pin and
out of the GND pin.
Note 16: Reverse current is higher for the case of (rated_output)
< VOUT < VIN, because the no-load recovery circuitry is active in this region
and is trying to restore the output voltage to its nominal value.
3022fb
5
5 Page 
BLOCK DIAGRAM
LT3022/LT3022-1.2
LT3022-1.5/LT3022-1.8
9 SHDN SHUTDOWN
200mV
BIAS CURRENT
AND
REFERENCE
GENERATOR
213mV
NOTE:
FOR LT3022 ADJ PIN (5) IS
CONNECTED TO THE ADJ PIN,
R1 AND R2 ARE EXTERNAL.
FOR LT3022-1.X PIN (5) IS
CONNECTED TO THE SENSE PIN,
R1 AND R2 ARE INTERNAL.
TIE PGND, AGND AND THE EXPOSED
PAD TOGETHER.
IDEAL
DIODE
THERMAL
SHUTDOWN
–
ERROR
+ AMP
–
NO-LOAD
R+ECOVERY
CURRENT
GAIN
R3
D1
Q1
PGND
10, 11
D2
Q2
25k
FIXED
VOUT
1.2V
1.5V
1.8V
R1 R2
3.92k 19.6k
3.92k 25.5k
3.92k 31.4k
IN
12, 13, 14
Q3
OUT
3, 4
SENSE 5
R2
R1
3022 BD
ADJ 5
AGND
6, 7
3022fb
11
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet LT3022-1.8.PDF ] | |
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