LT3070 Datasheet, PDF (1/24 Pages) Linear Technology – 5A, Low Noise, Programmable Output, 85mV Dropout Linear Regulator

FEATURES
n _{Output Current: 5A}
n _{Dropout Voltage: 85mV Typical}
n _{Digitally Programmable VOUT: 0.8V to 1.8V}
n _{Digital Output Margining: ±1%, ±3% or ±5%}
n _{Low Output Noise: 25μVRMS (10Hz to 100kHz)}
n _{Parallelable: Use Two for a 10A Output}
n _{Precision Current Limit: ±10%}
n _{±1% Accuracy Over Line, Load and Temperature}
n _{Stable with Low ESR Ceramic Output Capacitors}
(15μF Minimum)
n _{High Frequency PSRR: 35dB at 1MHz}
n _{Enable Function Turns Output On/Off}
n _{VIOC Pin Controls Buck Converter to Maintain Low}
Power Dissipation and Optimize Efficiency
n _{PWRGD/UVLO Flag}
n _{Current Limit Foldback Protection}
n _{Thermal Shutdown}
n _{28-Lead (4mm × 5mm) QFN Package}
APPLICATIONS
n _{FPGA and DSP Supplies}
n _{ASIC and Microprocessor Supplies}
n _{Servers and Storage Devices}
n _{Post Buck Regulation and Supply Isolation}
Electrical Specifications Subject to Change
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 tolerance 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 of Linear
Technology Corporation. UltraFast is a trade mark of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
0.9V, 5A Regulator
V_BIAS
2.2V TO 3.6V
50k
2.2μF
PWRGD
V_IN
1.2V
BIAS
IN
PWRGD
330μF
EN
SENSE
V_O0 LT3070 OUT
V_O1
V_O2
MARGSEL
2.2μF
4.7μF
V_OUT
0.9V
10μF 5A
MARGTOL
VIOC
REF/BYP
1nF
GND
0.01μF
3070 TA01a
Dropout Voltage
4
3
2
PLACE HOLDER
1
0
0
10
20
30
40
XXX
LTXXXX • TPCXX
3070p
1