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For price, delivery and to place orders: Hittite Microwave Corporation, 2 Elizabeth Drive, Chelmsford, MA 01824

978-250-3343 tel • 978-250-3373 fax • Order On-line at www.hittite.com

Application Support: apps@hittite.com

HMC976LP3E

400mA LOW NOISE, HIGH PSRR

LINEAR VOLTAGE REGULATOR

v02.1112

General Description

Features

Functional Diagram

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.

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

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

Table 1. Electrical Specifications, TA = +25 °C

Parameter

Conditions

Min

Typ

Max

Units

Output Voltage VR (Default)

Vdd = 5.5V; Maximum load current

4.7

4.8

4.9

V

Output Voltage VR (5V setting)

Vdd = 5.5V; Maximum load current

4.9

5

5.1

V

Output Voltage Tolerance

Vdd = 5.5V; Maximum load current;

Default and 5V setting

2

%

Input Voltage Range (Default)

Default output voltage configuration

5.1

5.5

V

Input Voltage Range

3.3

5.5

V

Output Voltage Range VR

Set by external resistors.

1.8

5.1

V

Information furnished by Analog Devices is believed to be accurate and reliable. However, no

responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other

rights of third parties that may result from its use. Specifications subject to change without notice. No

license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

Trademarks and registered trademarks are the property of their respective owners.

For price, delivery, and to place orders: Analog Devices, Inc.,

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106

Phone: 781-329-4700 • Order online at www.analog.com

Application Support: Phone: 1-800-ANALOG-D