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v02.1112
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”
For price, delivery and to place orders: Hittite Microwave Corporation, 2 Elizabeth Drive, Chelmsford, MA 01824
1 978-250-3343 tel • 978-250-3373 fax • Order On-line at www.hittite.com
Application Support: apps@hittite.com

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v02.1112
HMC976LP3E
400mA LOW NOISE, HIGH PSRR
LINEAR VOLTAGE REGULATOR
Table 1. Electrical Specifications (Continued)
Parameter
Reference Voltage VREF
Output Current VR [1]
Output Noise Spectral Density
10 Hz
100 Hz
1 kHz
10 kHz
100 kHz
Integrated Output Noise 100 Hz to 100 kHz
Load Regulation, VR
PSRR
1 kHz
10 kHz
100 kHz
1 MHz
10 MHz
50 MHz
Output Voltage Variation vs. Package
Base Temperature
25°C to 85°C
-40°C to 25°C
Current Consumption (IGND)
Power Down Current
Start-Up Transient Time
Enable Input EN High Level
Enable Input EN Low Level
Output Load Capacitance [2]
Conditions
Vdd = 5.5V; REF cannot source/sink
external current
TA = -40°C to +85°C
Vdd = 5.5V; VR = 5.0V
Measured on Application Schematic [3]
Maximum Load Current
Vdd = 5.5V; VR = 5.0V [3]
Vdd = 5.5V; VR=5.0V
Vdd = 5.5V; VR=5.0V
Maximum load current
Vdd = 5.5V; VR=5.0V
Maximum load current
Ven = Vdd = 5.5V;
Maximum Load Current
Vdd = 5.5V; EN = Low; Output is float-
ing (high - impedance) in Power-Down
mode
0 to 90% of final voltage
Vdd = 5.5V[3]
Vdd>=VEN
Vdd>=VEN
To guarantee stability, noise and PSRR
performance [3]
Thermal Protection Threshold Junction
Temperature [4]
Thermal Protection Hysteresis
Junction Temperature Rising
Min
2
0
4.7
115
Typ
1.17
4000
120
6
3
3
1.5
-70
-65
-45
-35
-30
-20
0.005
0.005
1.1
130
10
Max Units
V
400 mA
nV/rtHz
µVrms
0.01 % / mA
dB
0.01 % / °C
0.01 % / °C
1.5 mA
1 µA
200 ms
Vdd V
0.8 V
µF
°C
°C
[1] The regulator does not include short-circuit protection circuitry. The outputs will withstand short-circuit conditions for a duration <10s. The
thermal protection is not intended to be used as a short circuit protection
[2] HMC976LP3E was designed to work with low ESR ceramic capacitors connected to pin 4 VRX.
[3] See HMC976LP3E 5.0V User Application Schematic herein
[4] See figures 14,15, and 16
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
2

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v02.1112
HMC976LP3E
400mA LOW NOISE, HIGH PSRR
LINEAR VOLTAGE REGULATOR
Figure 1. Vout=5V Output Noise
Spectral Density [1]
10-5
C3=1uF
10-6 C2=10uF
C3=1uF
10-7 C2=1uF
10-8
10-9
C3=4.7uF
C2 =4.7uF
10-10
101 102 103 104 105 106 107 108
FREQUENCY (Hz)
Figure 3. Vout 4.8V PSRR vs.
Vin-Vout [3]
-20
-30 VIN-VOUT=0.4V
-40
-50
VIN-VOUT=0.6V
-60
VIN-VOUT=0.8V
-70
-80
102 103 104 105 106 107 108
FREQUENCY (Hz)
Figure 2. Vout=3.3V Output Noise
Spectral Density [2]
10-5
10-6
10-7
C3=4.7uF
C2=4.7uF
10-8
10-9
C3=4.7uF
C2=10uF
10-10
101 102 103 104 105 106 107 108
FREQUENCY (Hz)
Figure 4. Vout=3.3V PSRR vs.
Vin-Vout [2]
-20
VIN-VOUT=0.5V
-30
VIN-VOUT=0.25V
-40
-50
VIN-VOUT=0.8V
-60
-70
-80
VIN-VOUT=1.0V
VIN-VOUT=1.7V
-90
102 103 104 105 106 107 108
FREQUENCY (Hz)
Figure 5. Vout=5V and Vref vs.
Temperature [1,4]
4.975
4.970
VREF
1.175
1.170
4.965
4.960
VR
1.165
1.160
4.955
1.155
4.950
1.150
-40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90
TEMPERATURE (°C)
Figure 6. Vout=5V and Vref vs.
Temperature [1,4]
5.00
4.90
25C
85C
4.80
-40
0.6
0.5
0.4
4.70
0.3
4.60
0.2
4.50
0.1
4.40 4
0
4.2 4.4 4.6 4.8 5 5.2 5.4 5.6
INPUT VOLTAGE (V)
[1] VDD=5.5V,400mA Load see “HMC976LP3E 5V User Application Schematic”
[2] VDD=5.0V,400mA Load see “HMC976LP3E 3.3V User Application Schematic”
[3] VDD=5.5V,400mA Load see “HMC976LP3E 4.8V User Application Schematic”.
[4] Temperature is the ambient temperature of the standard HMC976LP3E evaluation board, still air.
For price, delivery and to place orders: Hittite Microwave Corporation, 2 Elizabeth Drive, Chelmsford, MA 01824
3 978-250-3343 tel • 978-250-3373 fax • Order On-line at www.hittite.com
Application Support: apps@hittite.com

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v02.1112
Figure 7. Output Load Switched
OFF to ON [1]
5.08 500
5.04 400
5.00 300
4.96
VR Output
200
4.92
4.88
-5
CURRENT
100
0
0 5 10 15 20 25 30 35 40 45
TIME (ms)
HMC976LP3E
400mA LOW NOISE, HIGH PSRR
LINEAR VOLTAGE REGULATOR
Figure 8. Output Load Switched
ON to OFF [1]
5.08 500
5.04
VR Output
400
5.00 300
4.96 200
4.92 CURRENT
100
4.88
-5
0
0
5 10 15 20 25 30 35 40 45
TIME (ms)
Figure 9. Supply Turn-On Transient [2]
4.00
3.50
3.00
2.50
2.00
1.50
1.00
0.500
0.00
-50
4.00
3.50
ENA
3.00
2.50
VR Output
2.00
1.50
1.00
0.500
0.00
0 50 100 150 200 250 300 350 400 450
TIME (ms)
Figure 10. Supply Turn-Off Transient [2]
4.00
3.50
3.00
2.50
2.00
1.50
1.00
0.500
0.00
-0.200
ENA
VR Output
0.00
0.200
0.400
TIME (s)
0.600
4.00
3.50
3.00
2.50
2.00
1.50
1.00
0.500
0.00
0.800
Figure 11. HMC976LP3E Output Noise
Spectral Density vs. Commercial PSU [1]
10-5
10-6
Commercial PSU Output
Input to regulator
Figure 12. Vout vs. Load current [1]
5.050
5.030
10-7 5.010
10-8 4.990
10-9
HMC976LP3E Output
10-10
101 102 103 104 105 106 107 108
FREQUENCY (Hz)
4.970
4.950
0
50 100 150 200 250 300 350 400
LOAD CURRENT mA
[1] VDD=5.5V, 400mA Load ““HMC976LP3E 5V User Application Schematic”.
[2] VDD=5.0V, 400mA Load “HMC976LP3E 3.3V User Application Schematic”
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
4

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v02.1112
HMC976LP3E
400mA LOW NOISE, HIGH PSRR
LINEAR VOLTAGE REGULATOR
Table 2. Absolute Maximum Ratings
Vdd to GND Voltage
EN to GND Voltage
RDx / HVx to GND Voltage
Maximum Dissipation
Thermal Resistance
(Junction to Ambient)
Thermal Resistance (Junction to
Case, Ground Paddle)
Maximum Junction Temperature
Max Output Current
Storage Temperature
ESD Sensitivity (HBM)
+5.8V / -0.3V
+5.8V /-0.3V
+5.8V / -0.3V
780mW
51.5 °C/W [3]
18 °C/W
+150 °C
420 mA
-65 to +150 °C
Class 1C
Stresses above those listed under Absolute Maximum
Ratings may cause permanent damage to the device. This
is a stress rating only; functional operation of the device
at these or any other conditions above those indicated in
the operational section of this specification is not implied.
Exposure to absolute maximum rating conditions for
extended periods may affect device reliability. The absolute
maximum ratings apply individually only, not in combination.
ELECTROSTATIC SENSITIVE DEVICE
OBSERVE HANDLING PRECAUTIONS
Table 3. Recommended Operating Condition
Parameter
Condition Min. Typ. Max. Units
Junction Temperature
115 °C
Ambient Temperature
-40 85 °C
Outline Drawing
Table 4. Package Information
NOTES:
[1] PACKAGE BODY MATERIAL: LOW STRESS INJECTION MOLDED PLASTIC
SILICA AND SILICON IMPREGNATED.
[2] LEAD AND GROUND PADDLE MATERIAL: COPPER ALLOY.
[3] LEAD AND GROUND PADDLE PLATING: 100% MATTE TIN.
[4] DIMENSIONS ARE IN INCHES [MILLIMETERS].
[5] LEAD SPACING TOLERANCE IS NON-CUMULATIVE.
[6] PAD BURR LENGTH SHALL BE 0.15mm MAX. PAD BURR HEIGHT SHALL
BE 0.25m MAX.
[7] PACKAGE WARP SHALL NOT EXCEED 0.05mm
[8] ALL GROUND LEADS AND GROUND PADDLE MUST BE SOLDERED TO
PCB GROUND.
[9] REFER TO HITTITE APPLICATION NOTE FOR SUGGESTED PCB LAND
PATTERN.
Part Number
HMC976LP3E
Package Body Material
Lead Finish
RoHS-compliant Low Stress Injection Molded Plastic 100% matte Sn
MSL Rating
MSL1 [2]
[1] 4-Digit lot number XXXX
[2] Max peak reflow temperature of 260 °C
[3] For standard HMC976LP3E evaluation board, no heat sink (HS) and no air flow, see figures 14, 15, and 16
Package Marking [1]
976
XXX
X
For price, delivery and to place orders: Hittite Microwave Corporation, 2 Elizabeth Drive, Chelmsford, MA 01824
5 978-250-3343 tel • 978-250-3373 fax • Order On-line at www.hittite.com
Application Support: apps@hittite.com