HMC976LP3E Datasheet, PDF (1/12 Pages) Hittite Microwave Corporation – 400mA LOW NOISE, HIGH PSRR LINEAR VOLTAGE REGULATOR

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Typical Applications
The HMC976LP3E is ideal for:
• Test Instrumentation
• Military Radios, Radar and ECM
• Basestation Infrastructure
• Ultra Low Noise Frequency Generation
• Fractional-N Synthesizer Supply
• Microwave VCO Supply
• Mixed-Signal Circuit Supply
• Low Noise Baseband Circuit Supply
HMC976LP3E
400mA LOW NOISE, HIGH PSRR
LINEAR VOLTAGE REGULATOR
Features
High Output Current: 400mA
Low Dropout: 300mV at 400mA Output and VR>3V
Ultra Low Noise: 3nV/√Hz at 10 kHz, 6nV/√Hz at 1 kHz
High Power Supply Rejection Ratio (PSRR):
<-60 dB at 1 kHz, <-30 dB at 1 MHz
Adjustable Voltage Output: VR 1.8 to 5V at 400mA
Designed to work with low ESR ceramic capacitors
Low Power-Down Current: <1 µA
Thermal Protection
16 Lead 3x3 mm SMT Package: 9mm²
Functional Diagram
General Description
The HMC976LP3E is a BiCMOS ultra low noise
linear voltage regulator. The high Power Supply
Rejection Ratio (PSRR) in the 0.1 MHz to 10 MHz
range provides excellent rejection of any preceding
switching regulator or other power supply noise.
The voltage output is ideal for frequency generation
subsystems including Hittite’s broad line of PLLs with
integrated VCOs.
The output voltage can be adjusted lower than the
default value by using one external resistor. The output
can be set to 5V by grounding the HV pin. The regulator
can be powered down by the TTL-compatible Enable
input. The HMC976LP3E is housed in a 3x3mm QFN
SMT package.
Table 1. Electrical Specifications, TA = +25 °C
Parameter
Output Voltage VR (Default)
Output Voltage VR (5V setting)
Output Voltage Tolerance
Input Voltage Range (Default)
Input Voltage Range
Output Voltage Range VR
Conditions
Min
Typ
Max
Units
Vdd = 5.5V; Maximum load current
4.7
4.8
4.9
V
Vdd = 5.5V; Maximum load current
4.9
5
5.1
V
Vdd = 5.5V; Maximum load current;
Default and 5V setting
2
%
Default output voltage configuration
5.1
5.5
V
For VR>3V^[1] VDD>VR+0.3V
3.3
5.5
V
Set by external resistors.
1.8
5.1
V
[1] See Absolute Maximum Ratings Table “Absolute Maximum Ratings”
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