HMC976LP3E
v02.1112
400mA LOW NOISE, HIGH PSRR
LINEAR VOLTAGE REGULATOR
Typical Applications
Features
The HMC976LP3E is ideal for:
• Test Instrumentation
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
• Military Radios, Radar and ECM
• Basestation Infrastructure
• Ultra Low Noise Frequency Generation
• Fractional-N Synthesizer Supply
• Microwave VCO Supply
Adjustable Voltage Output: VR 1.8 to 5V at 400mA
Designed to work with low ESR ceramic capacitors
Low Power-Down Current: <1 µA
• Mixed-Signal Circuit Supply
• Low Noise Baseband Circuit Supply
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, T = +25 °C
A
Parameter
Conditions
Min
4.7
4.9
Typ
4.8
5
Max
4.9
Units
V
Output Voltage VR (Default)
Output Voltage VR (5V setting)
Vdd = 5.5V; Maximum load current
Vdd = 5.5V; Maximum load current
5.1
V
Vdd = 5.5V; Maximum load current;
Default and 5V setting
Output Voltage Tolerance
2
%
Input Voltage Range (Default)
Input Voltage Range
Default output voltage configuration
For VR>3V[1] VDD>VR+0.3V
Set by external resistors.
5.1
3.3
1.8
5.5
5.5
5.1
V
V
V
Output Voltage Range VR
[1] See Absolute Maximum Ratings Table “Absolute Maximum Ratings”
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
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rights of third parties that may result from its use. Specifications subject to change without notice. No
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Phone: 781-329-4700 • Order online at www.analog.com
Application Support: Phone: 1-800-ANALOG-D
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