LT3070_15 Datasheet, PDF (1/30 Pages) Linear Technology – 5A, Low Noise, Programmable Output, 85mV Dropout Linear Regulator

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 25µV_RMS. 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 V_OUT + 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
V_BIAS
2.2V TO 3.6V
V_IN
1.2V
2.2µF
330µF
1nF
0.9V, 5A Regulator
50k
PWRGD
BIAS
IN
PWRGD
EN
SENSE
V_O0 LT3070 OUT
V_O1
V_O2
MARGSEL
MARGTOL
VIOC
REF/BYP
GND
2.2µF*
4.7µF*
V_OUT
0.9V
10µF* ^5A
*X5R OR X7R CAPACITORS
0.01µF
3070 TA01a
For more information www.linear.com/LT3070
Dropout Voltage
150
V_IN = V_OUT(NOMINAL)
120
90
V_OUT = 1.8V
V_BIAS = 3.3V
60
V_OUT = 0.8V
V_BIAS = 2.5V
30
0
0
1
2
3
4
5
OUTPUT CURRENT (A)
3070 TA01b
3070fc
1