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Linear Technology: UltraFast Digitally Programmable 5A LDO Features Analog Margining, ...
Datum: Dienstag, der 18. Mai 2010 @ 16:53:03 Thema: Deutsche Politik Infos
MILPITAS, CA May 12, 2010 Linear Technology Corporation announces the LT3071, the second in a family of digitally programmable linear regulators with the lowest dropout voltage, lowest noise and fastest transient response of any monolithic 5A LDO currently available. Dropout voltage at 5A is an ultralow 85mV. Output voltage noise at 5A is only 25uVRMS over a 10Hz to 100kHz bandwidth. The LT3071s 1MHz unity gain bandwidth, coupled with its minimum 15uF ceramic output capacitance, provides a mere 30mV of overshoot/undershoot in response to a fast 4.5A output load step, saving significant bulk capacitance, space and cost. The LT3071 is ideal for efficiently powering low voltage, high current devices such as FPGAs, DSPs, ASICs, microprocessors, sensitive communication supplies, server/storage devices, and post-buck regulation applications.
The LT3071s output voltage is digitally programmable from 0.8V to 1.8V in 50mV increments. Accuracy is tightly specified at ±1% over line, load and temperature. An analog output margining feature can adjust system output voltage over a continuous ±10% range, advantageous during system development debug. A PowerGood flag indicates if output voltage is in regulation or if the device is in UVLO, and the flag also provides an early warning indication of a thermal fault. An output current monitor sources a scaled dynamic representation of output current (IOUT/2500) that can be measured directly or terminated with a resistor and converted to voltage, allowing load conditions or power to be calculated. The LT3071s input supply voltage range is 0.95V to 3.0V and its bias supply voltage ranges from 2.2V to 3.6V. The bias supply provides gate drive to the internal NMOS pass device.
Multiple LT3071 devices can be easily paralleled for higher output current and to spread heat across a circuit board. A tracking feature can control a buck regulator powering the LT3071s input. This tracking function drives the upstream buck regulator to maintain the LT3071s input voltage at VOUT + 300mV, minimizing power dissipation. If output voltage is dynamically changed, the tracking function automatically adjusts the output voltage of the buck regulator to maintain efficiency. Internal protection circuitry includes UVLO, reverse-current protection, precision current limiting with power foldback and thermal shutdown with hysteresis.
The LT3071 is offered in a thermally enhanced, low profile (0.75mm) 28-lead
4mm x 5mm QFN package, and both E and I grades operate from -40°C to +125°C junction temperature range. For more information, visit www.linear.com
Summary of Features: LT3071
Output Current: 5A
Dropout Voltage: 85mV Typical
Digitally Programmable VOUT : 0.8V to 1.8V in 50mV Increments
Analog Output Margining: ±10% Range
Output Current Monitor: Sources IOUT/2500, 2mA at IOUT = 5A
Low Output Noise: 25uVRMS (10Hz to 100kHz)
Parallelable: Use Two for a 10A Output
Precision Current Limit: ±20%
±1% Accuracy Over Line, Load and Temperature
Stable with Low ESR Ceramic Output Capacitors (15uF Minimum)
High Frequency PSRR: 30dB at 1MHz
Enable Function Turns Output On/Off
VIOC Pin Controls Buck Converter to Maintain Low Power Dissipation & Optimize Efficiency
PWRGD/UVLO/Thermal Shutdown Flag
Current Limit with Foldback Protection
Thermal Shutdown
Low Profile (0.75mm) Thermally Enhanced 28-Lead 4mm x 5mm QFN Package
MILPITAS, CA May 12, 2010 Linear Technology Corporation announces the LT3071, the second in a family of digitally programmable linear regulators with the lowest dropout voltage, lowest noise and fastest transient response of any monolithic 5A LDO currently available. Dropout voltage at 5A is an ultralow 85mV. Output voltage noise at 5A is only 25uVRMS over a 10Hz to 100kHz bandwidth. The LT3071s 1MHz unity gain bandwidth, coupled with its minimum 15uF ceramic output capacitance, provides a mere 30mV of overshoot/undershoot in response to a fast 4.5A output load step, saving significant bulk capacitance, space and cost. The LT3071 is ideal for efficiently powering low voltage, high current devices such as FPGAs, DSPs, ASICs, microprocessors, sensitive communication supplies, server/storage devices, and post-buck regulation applications.
The LT3071s output voltage is digitally programmable from 0.8V to 1.8V in 50mV increments. Accuracy is tightly specified at ±1% over line, load and temperature. An analog output margining feature can adjust system output voltage over a continuous ±10% range, advantageous during system development debug. A PowerGood flag indicates if output voltage is in regulation or if the device is in UVLO, and the flag also provides an early warning indication of a thermal fault. An output current monitor sources a scaled dynamic representation of output current (IOUT/2500) that can be measured directly or terminated with a resistor and converted to voltage, allowing load conditions or power to be calculated. The LT3071s input supply voltage range is 0.95V to 3.0V and its bias supply voltage ranges from 2.2V to 3.6V. The bias supply provides gate drive to the internal NMOS pass device.
Multiple LT3071 devices can be easily paralleled for higher output current and to spread heat across a circuit board. A tracking feature can control a buck regulator powering the LT3071s input. This tracking function drives the upstream buck regulator to maintain the LT3071s input voltage at VOUT + 300mV, minimizing power dissipation. If output voltage is dynamically changed, the tracking function automatically adjusts the output voltage of the buck regulator to maintain efficiency. Internal protection circuitry includes UVLO, reverse-current protection, precision current limiting with power foldback and thermal shutdown with hysteresis.
The LT3071 is offered in a thermally enhanced, low profile (0.75mm) 28-lead
4mm x 5mm QFN package, and both E and I grades operate from -40°C to +125°C junction temperature range. For more information, visit www.linear.com
Summary of Features: LT3071
Output Current: 5A
Dropout Voltage: 85mV Typical
Digitally Programmable VOUT : 0.8V to 1.8V in 50mV Increments
Analog Output Margining: ±10% Range
Output Current Monitor: Sources IOUT/2500, 2mA at IOUT = 5A
Low Output Noise: 25uVRMS (10Hz to 100kHz)
Parallelable: Use Two for a 10A Output
Precision Current Limit: ±20%
±1% Accuracy Over Line, Load and Temperature
Stable with Low ESR Ceramic Output Capacitors (15uF Minimum)
High Frequency PSRR: 30dB at 1MHz
Enable Function Turns Output On/Off
VIOC Pin Controls Buck Converter to Maintain Low Power Dissipation & Optimize Efficiency
PWRGD/UVLO/Thermal Shutdown Flag
Current Limit with Foldback Protection
Thermal Shutdown
Low Profile (0.75mm) Thermally Enhanced 28-Lead 4mm x 5mm QFN Package
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