Linear Regulator. LT3070 Datasheet

LT3070 Regulator. Datasheet pdf. Equivalent

Part LT3070
Description 85mV Dropout Linear Regulator
Feature FEATURES nn Output Current: 5A nn Dropout Voltage: 85mV Typical nn Digitally Programmable VOUT : 0.8.
Manufacture Linear Technology
Datasheet
Download LT3070 Datasheet




LT3070
FEATURES
nn Output Current: 5A
nn Dropout Voltage: 85mV Typical
nn Digitally Programmable VOUT : 0.8V to 1.8V
nn Digital Output Margining: ±1%, ±3% or ±5%
nn Low Output Noise: 25µVRMS (10Hz to 100kHz)
nn Parallel Multiple Devices for 10A or More
nn Precision Current Limit: ±20%
nn ±1% Accuracy Over Line, Load and Temperature
nn Stable with Low ESR Ceramic Output Capacitors
(15µF Minimum)
nn High Frequency PSRR: 30dB at 1MHz
nn Enable Function Turns Output On/Off
nn VIOC Pin Controls Buck Converter to Maintain Low
Power Dissipation and Optimize Efficiency
nn PWRGD/UVLO/Thermal Shutdown Flag
nn Current Limit with Foldback Protection
nn Thermal Shutdown
nn 28-Lead (4mm × 5mm × 0.75mm) QFN Package
APPLICATIONS
nn FPGA and DSP Supplies
nn ASIC and Microprocessor Supplies
nn Servers and Storage Devices
nn Post Buck Regulation and Supply Isolation
LT3070
5A, Low Noise,
Programmable Output,
85mV Dropout
Linear Regulator
DESCRIPTION
The LT®3070 is a low voltage, UltraFast™ transient re-
sponse linear regulator. The device supplies up to 5A of
output current with a typical dropout voltage of 85mV.
A 0.01µF reference bypass capacitor decreases output
voltage noise to 25µVRMS. The LT3070’s high bandwidth
permits the use of low ESR ceramic capacitors, saving
bulk capacitance and cost. The LT3070’s features make
it ideal for high performance FPGAs, microprocessors or
sensitive communication supply applications.
Output voltage is digitally selectable in 50mV increments
over a 0.8V to 1.8V range. A margining function allows
the user to adjust system output voltage in increments of
±1%, ±3% or ±5%. The IC incorporates a unique tracking
function to control a buck regulator powering the LT3070’s
input. This tracking function drives the buck regulator to
maintain the LT3070’s input voltage to VOUT + 300mV,
minimizing power dissipation.
Internal protection includes UVLO, reverse-current protec-
tion, precision current limiting with power foldback and
thermal shutdown. The LT3070 regulator is available in a
thermally enhanced 28-lead, 4mm × 5mm QFN package.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
UltraFast and VLDO are trademarks of Linear Technology Corporation. All other trademarks are
the property of their respective owners. Patents pending.
TYPICAL APPLICATION
VBIAS
2.2V TO 3.6V
VIN
1.2V
2.2µF
330µF
1nF
0.9V, 5A Regulator
50k
PWRGD
BIAS
IN PWRGD
EN SENSE
VO0 LT3070
VO1
VO2
MARGSEL
OUT
MARGTOL
VIOC
REF/BYP
GND
2.2µF*
4.7µF*
VOUT
0.9V
10µF* 5A
*X5R OR X7R CAPACITORS
0.01µF
3070 TA01a
For more information www.linear.com/LT3070
Dropout Voltage
150 VIN = VOUT(NOMINAL)
120
90
VOUT = 1.8V
VBIAS = 3.3V
60
VOUT = 0.8V
VBIAS = 2.5V
30
0
01 2 345
OUTPUT CURRENT (A)
3070 TA01b
3070fc
1



LT3070
LT3070
ABSOLUTE MAXIMUM RATINGS
(Note 1)
IN, OUT...................................................... –0.3V to 3.3V
BIAS.............................................................. –0.3V to 4V
VO2, VO1, VO0 Inputs..................................... –0.3V to 4V
MARGSEL, MARGTOL Input......................... –0.3V to 4V
EN Input........................................................ –0.3V to 4V
SENSE Input.................................................. –0.3V to 4V
VIOC, PWRGD Outputs................................. –0.3V to 4V
REF/BYP Output............................................ –0.3V to 4V
Output Short-Circuit Duration……...................Indefinite
Operating Junction Temperature (Note 2)
LT3070E/LT3070I.............................. –40°C to 125°C
LT3070MP.......................................... –55°C to 125°C
Storage Temperature Range................... –65°C to 150°C
PIN CONFIGURATION
TOP VIEW
28 27 26 25 24 23
VIOC 1
22 MARGTOL
PWRGD 2
21 MARGSEL
REF/BYP 3
20 GND
GND 4
IN 5
29 19 SENSE
GND 18 OUT
IN 6
17 OUT
IN 7
16 OUT
IN 8
15 OUT
9 10 11 12 13 14
UFD PACKAGE
28-LEAD (4mm × 5mm) PLASTIC QFN
TJMAX = 125°C, θJA = 30°C/W TO 35°C/W
EXPOSED PAD (PIN 29) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LT3070EUFD#PBF
LT3070EUFD#TRPBF
3070
28-Lead (4mm × 5mm) Plastic QFN
–40°C to 125°C
LT3070IUFD#PBF
LT3070IUFD#TRPBF
3070
28-Lead (4mm × 5mm) Plastic QFN
–40°C to 125°C
LT3070MPUFD#PBF
LT3070MPUFD#TRPBF 3070
28-Lead (4mm × 5mm) Plastic QFN
–55°C to 125°C
LEAD BASED FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LT3070EUFD
LT3070EUFD#TR
3070
28-Lead (4mm × 5mm) Plastic QFN
–40°C to 125°C
LT3070IUFD
LT3070IUFD#TR
3070
28-Lead (4mm × 5mm) Plastic QFN
–40°C to 125°C
LT3070MPUFD
LT3070MPUFD#TR
3070
28-Lead (4mm × 5mm) Plastic QFN
–55°C to 125°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
3070fc
2 For more information www.linear.com/LT3070







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