LT3072
Dual, Low Noise, 2.5A
Programmable Output, 80mV
Low Dropout Linear Regulator
FEATURES
DESCRIPTION
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Dual, Independent 2.5A Outputs
The LT®3072 is a low voltage, UltraFast™ transient
response, dual channel linear regulator. The device
supplies up to 2.5A per channel with a typical dropout
voltage of 80mV. A 0.1µF reference bypass capacitor
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Dropout Voltage: 80mV
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Low Output Noise: 12µV
(10Hz to 100kHz)
RMS
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Digitally Programmable V : 0.6V to 2.5V
OUT
Output Tolerance: 1.25ꢀ% 1.5ꢀ Over Load, Line and
decreases output voltage noise to 12µV
. The wide
RMS
Temperature
bandwidth and high PSRR permit the use of small ceramic
capacitors, saving bulk capacitance and cost. The LT3072
is ideal for high performance FPGAs, microprocessors
and sensitive RF communication supply applications.
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Analog Output Margining: 10ꢀ Range
Parallel Multiple Devices for Higher Current
Programmable Precision Current Limit: 7ꢀ
Output Current Monitor: I
= I %3000
MON
OUT
Independent output voltages are digitally selectable
in 50mV increments from 0.6V to 1.2V and in 100mV
increments from 1.2V to 2.5V. Output current monitors
provide diagnostics and program the precision current
limit. The LT3072 incorporates a unique tracking fea-
ture (VIOC) to control the upstream buck regulator(s)
powering the inputs. VIOC adaptively servos the buck
regulator to maintain the LT3072 input-to-output voltage
differential to 300mV at maximum load and 450mV at
light load, minimizing power dissipation with less input
capacitance. Internal protection circuitry includes UVLO,
OVLO, reverse-current protection, current limiting and
thermal shutdown. The LT3072 is available in a low profile
(0.75mm) 36-lead 4mm × 7mm QFN package.
High Frequency PSRR: 30dB at 1MHz
Stable with Ceramic Output Capacitors (10µF Minimum)
VIOC Pin Controls Buck Converter to Maintain Low
Power Dissipation and Optimize Efficiency
PWRGD%UVLO Flags
Current Limit and Thermal Shutdown Protection
Temperature Monitor
36-Lead 4mm × 7mm QFN Package
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APPLICATIONS
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FPGA, DSP and Microprocessor Power Supplies
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Low Noise RF Power Supplies
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High-Speed Servers and Storage Devices
Post Buck Regulation and Supply Isolation
All registered trademarks and trademarks are the property of their respective owners.
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TYPICAL APPLICATION
Dropout Voltage vs Load Current
2.5V/0.6V, 2.5A Regulators
ꢇ
ꢀꢁꢂꢃ
ꢛꢇ
ꢀ00
ꢍꢑRꢏꢒ
ꢀ
ꢀ
ꢀ
ꢀ ꢁ
ꢀꢁꢂꢃꢄꢀꢅꢆꢄꢇꢈꢉ
ꢖ.ꢞꢡꢊ
ꢖꢞꢡꢊ
0.ꢆꢡꢊ
ꢀꢁ
ꢖꢗ.ꢗꢘ
ꢀꢁꢂꢃ
ꢀꢁꢂꢃ
ꢀ 0.ꢁꢂ ꢃ ꢄ.ꢅꢂ
ꢀꢁꢂ
ꢀꢁꢂꢃ
ꢇ
ꢉ.ꢛꢇ
ꢉ.ꢛꢂ
ꢄꢅꢆ
ꢁꢅꢆ
ꢇ
ꢍꢑRꢏꢒꢆ
ꢈꢓꢔꢆ
ꢃꢄꢅꢃꢄꢆ
ꢈꢓꢔꢆ
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ꢇ
ꢁꢅꢆ
ꢀ0
ꢀ0
ꢀ0
ꢀ0
0
ꢉ.ꢞꢇ ꢔꢈ
ꢝ.ꢖꢛꢇ
ꢈꢆꢀꢉ
ꢆ0ꢡꢊꢢ
ꢆꢘ
ꢇ
ꢇ
ꢈꢆꢀꢆ
ꢈꢆꢀ0
Rꢄꢊꢋꢀꢌꢍꢆ
ꢎꢂRꢏꢂꢆ
ꢇꢁꢈꢐꢆ
ꢇ
ꢎꢈꢅꢆ
ꢁ
ꢠꢝꢝ.ꢝꢙꢇ ꢂꢔ ꢉ.ꢛꢂ ꢊꢓꢕꢕꢥꢃꢐꢂꢕꢄ
ꢆꢇ ꢂꢔ ꢝꢂ ꢐꢓRRꢄꢅꢔ ꢕꢁꢎꢁꢔ
ꢎꢈꢅꢋꢕꢁꢎꢆ
ꢅꢐ
ꢕꢔꢝ0ꢞꢉ
ꢆꢟꢊ
ꢄꢅꢉ
ꢁꢅꢉ
ꢇ
ꢍꢑRꢏꢒꢉ
ꢇ
0.ꢤꢇ
ꢉ.ꢛꢂ
ꢈꢓꢔꢉ
ꢇ
ꢁꢅꢉ
ꢈꢓꢔꢉ
0.ꢠꢇ ꢔꢈ
ꢝ.ꢖꢛꢇ
ꢃꢄꢅꢃꢄꢉ
ꢖꢞꢡꢊ
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ꢆ0ꢡꢊꢢ
ꢇ
ꢇ
ꢈꢉꢀꢆ
ꢈꢉꢀ0
Rꢄꢊꢋꢀꢌꢍꢉ
ꢎꢂRꢏꢂꢉ
ꢇꢁꢈꢐꢉ
ꢇ
ꢎꢈꢅꢉ
ꢠꢝꢝ.ꢝꢙꢇ ꢂꢔ ꢉ.ꢛꢂ ꢊꢓꢕꢕꢥꢃꢐꢂꢕꢄ
ꢆꢇ ꢂꢔ ꢝꢂ ꢐꢓRRꢄꢅꢔ ꢕꢁꢎꢁꢔ
ꢁ
ꢎꢈꢅꢋꢕꢁꢎꢉ
ꢅꢐ
0.ꢆꢡꢊ
ꢆꢘ
ꢆꢟꢊ
ꢏꢅꢒ
ꢔꢄꢎꢍ
ꢇ
ꢔꢄꢎꢍ
ꢆ0ꢙꢇꢋꢚꢐ
ꢉꢛꢚꢐ ꢜ ꢉꢛ0ꢙꢇ ꢢꢦꢛR ꢈR ꢦꢞR ꢐꢂꢍꢂꢐꢁꢔꢈRꢃ
0
0.ꢀ
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ꢀꢁꢂꢃꢁꢂ ꢄꢁRRꢅꢆꢂ ꢇꢈꢉ
ꢝ0ꢞꢉ ꢔꢂ0ꢆꢣ
ꢀ0ꢁꢂ ꢃꢄ0ꢅꢆ
Rev. 0
1
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