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POWER CONDITIONING - SMT
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HMC976LP3E
400mA LOW NOISE, HIGH PSRR
LINEAR VOLTAGE REGULATOR
v0 2.1112
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 Specications, 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 conguration 5.1 5.5 V
Input Voltage Range For VR>3V[1] VDD>VR+0.3V 3.3 5.5 V
Output Voltage Range VR Set by external resistors. 1.8 5.1 V
[1] See Absolute Maximum Ratings Table “Absolute Maximum Ratings”
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HMC976LP3E
400mA LOW NOISE, HIGH PSRR
LINEAR VOLTAGE REGULATOR
v0 2.1112
Table 1. Electrical Specications (Continued)
Parameter Conditions Min Typ Max Units
Reference Voltage VREF Vdd = 5.5V; REF cannot source/sink
external current 1.17 V
Output Current VR [1] TA = -40°C to +85°C 400 mA
Output Noise Spectral Density
10 Hz
100 Hz
1 kHz
10 kHz
100 kHz
Vdd = 5.5V; VR = 5.0V
Measured on Application Schematic [3]
Maximum Load Current
4000
120
6
3
3
nV/rtHz
Integrated Output Noise 100 Hz to 100 kHz Vdd = 5.5V; VR = 5.0V [3] 1.5 µVrms
Load Regulation, VR Vdd = 5.5V; VR=5.0V 0.01 % / mA
PSRR
1 kHz
10 kHz
100 kHz
1 MHz
10 MHz
50 MHz
Vdd = 5.5V; VR=5.0V
Maximum load current
-70
-65
-45
-35
-30
-20
dB
Output Voltage Variation vs. Package
Base Temperature
25°C to 85°C
-40°C to 25°C
Vdd = 5.5V; VR=5.0V
Maximum load current 0.005
0.005
0.01
0.01
% / °C
% / °C
Current Consumption (IGND)Ven = Vdd = 5.5V;
Maximum Load Current 1.1 1.5 mA
Power Down Current
Vdd = 5.5V; EN = Low; Output is oat-
ing (high - impedance) in Power-Down
mode
1µA
Start-Up Transient Time 0 to 90% of nal voltage
Vdd = 5.5V[3] 200 ms
Enable Input EN High Level Vdd>=VEN 2 Vdd V
Enable Input EN Low Level Vdd>=VEN 0 0.8 V
Output Load Capacitance [2]
To guarantee stability, noise and PSRR
performance [3]
4.7 µF
Thermal Protection Threshold Junction
Temperature [4] Junction Temperature Rising 115 130 °C
Thermal Protection Hysteresis 10 °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 gures 14,15, and 16
POWER CONDITIONING - SMT
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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
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HMC976LP3E
400mA LOW NOISE, HIGH PSRR
LINEAR VOLTAGE REGULATOR
v0 2.1112
Figure 1. Vout=5V Output Noise
Spectral Density [1]
Figure 2. Vout=3.3V Output Noise
Spectral Density [2]
10-10
10-9
10-8
10-7
10-6
10-5
101102103104105106107108
NOISE VOLTAGE (V/rtHz)
FREQUENCY (Hz)
C3=1uF
C2=1uF
C3=1uF
C2=10uF
C3=4.7uF
C2 =4.7uF
10-10
10-9
10-8
10-7
10-6
10-5
101102103104105106107108
NOISE VOLTAGE (V/rtHz)
FREQUENCY (Hz)
C3=4.7uF
C2=4.7uF
C3=4.7uF
C2=10uF
4.950
4.955
4.960
4.965
4.970
4.975
1.150
1.155
1.160
1.165
1.170
1.175
-40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90
VOUT (V)
VREF (V)
TEMPERATURE (°C)
VREF
VR
4.40
4.50
4.60
4.70
4.80
4.90
5.00
0
0.1
0.2
0.3
0.4
0.5
0.6
4 4.2 4.4 4.6 4.8 5 5.2 5.4 5.6
25C
85C
-40
VIN-VOUT (V)
INPUT VOLTAGE (V)
VOUT (V)
-80
-70
-60
-50
-40
-30
-20
102103104105106107108
PSRR (dB)
FREQUENCY (Hz)
VIN-VOUT=0.4V
VIN-VOUT=0.6V
VIN-VOUT=0.8V
-90
-80
-70
-60
-50
-40
-30
-20
102103104105106107108
PSRR (dB)
FREQUENCY (Hz)
VIN-VOUT=0.25V
VIN-VOUT=0.5V
VIN-VOUT=0.8V
VIN-VOUT=1.0V
VIN-VOUT=1.7V
[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.
DROPOUT VOLTAGE VIN-VOUT (V)
Figure 3. Vout 4.8V PSRR vs.
Vin-Vout [3]
Figure 4. Vout=3.3V PSRR vs.
Vin-Vout [2]
Figure 5. Vout=5V and Vref vs.
Temperature [1,4]
Figure 6. Vout=5V and Vref vs.
Temperature [1,4]
POWER CONDITIONING - SMT
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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
v0 2.1112
4.88
4.92
4.96
5.00
5.04
5.08
0
100
200
300
400
500
-5 0 5 10 15 20 25 30 35 40 45
OUTPUT (V)
CURRENT (mA)
TIME (ms)
CURRENT
VR Output
4.88
4.92
4.96
5.00
5.04
5.08
0
100
200
300
400
500
-5 0 5 10 15 20 25 30 35 40 45
OUTPUT (V)
CURRENT (mA)
TIME (ms)
CURRENT
VR Output
0.00
0.500
1.00
1.50
2.00
2.50
3.00
3.50
4.00
0.00
0.500
1.00
1.50
2.00
2.50
3.00
3.50
4.00
-50 0 50 100 150 200 250 300 350 400 450
OUTPUT (V)
ENA (V)
TIME (ms)
VR Output
ENA
0.00
0.500
1.00
1.50
2.00
2.50
3.00
3.50
4.00
0.00
0.500
1.00
1.50
2.00
2.50
3.00
3.50
4.00
-0.200 0.00 0.200 0.400 0.600 0.800
OUTPUT (V)
ENA (V)
TIME (s)
VR Output
ENA
10-10
10-9
10-8
10-7
10-6
10-5
101102103104105106107108
NOISE VOLTAGE (V/rtHz)
FREQUENCY (Hz)
Commercial PSU Output
Input to regulator
HMC976LP3E Output
4.950
4.970
4.990
5.010
5.030
5.050
0 50 100 150 200 250 300 350 400
VOUT (V)
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”
Figure 7. Output Load Switched
OFF to ON [1]
Figure 8. Output Load Switched
ON to OFF [1]
Figure 9. Supply Turn-On Transient [2] Figure 10. Supply Turn-Off Transient [2]
Figure 11. HMC976LP3E Output Noise
Spectral Density vs. Commercial PSU [1] Figure 12. Vout vs. Load current [1]
POWER CONDITIONING - SMT
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For price, delivery and to place orders: Hittite Microwave Corporation, 2 Elizabeth Drive, Chelmsford, MA 01824
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HMC976LP3E
400mA LOW NOISE, HIGH PSRR
LINEAR VOLTAGE REGULATOR
v0 2.1112
Outline Drawing
Part Number Package Body Material Lead Finish MSL Rating Package Marking [1]
HMC976LP3E RoHS-compliant Low Stress Injection Molded Plastic 100% matte Sn MSL1 [2] 976
XXX
X
[1] 4-Digit lot number XXXX
[2] Max peak reow temperature of 260 °C
[3] For standard HMC976LP3E evaluation board, no heat sink (HS) and no air ow, see gures 14, 15, and 16
Table 2. Absolute Maximum Ratings
ELECTROSTATIC SENSITIVE DEVICE
OBSERVE HANDLING PRECAUTIONS
Table 3. Recommended Operating Condition
Vdd to GND Voltage +5.8V / -0.3V
EN to GND Voltage +5.8V /-0.3V
RDx / HVx to GND Voltage +5.8V / -0.3V
Maximum Dissipation 780mW
Thermal Resistance
(Junction to Ambient) 51.5 °C/W [3]
Thermal Resistance (Junction to
Case, Ground Paddle) 18 °C/W
Maximum Junction Temperature +150 °C
Max Output Current 420 mA
Storage Temperature -65 to +150 °C
ESD Sensitivity (HBM) 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 specication 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.
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.
Table 4. Package Information
Parameter Condition Min. Typ. Max. Units
Junction Temperature 115 °C
Ambient Temperature -40 85 °C
POWER CONDITIONING - SMT
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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
v0 2.1112
Pin Number Function Description Interface Schematic
1EN Enable Input, TTL Logic Level. The VR and VRX outputs
are oating (high impedance) when EN = Low.
2RD Resistive feedback for VR,
see “Output Voltage Adjust” section.
3REF Reference voltage (bandgap) output. Cannot be used to
source/sink current to/from external circuits
4VRX For Decoupling Capacitor
Cannot be used to source current to external circuits
11 VR Regulator Output VR 400mA
5HV Sets VR to 5V output when grounded
6 - 10, 12 - 14,16 N/C These pins can be left unconnected or connected to GND
with no change in performance
15 VDD Unregulated power supply input 5.5V max
Package Base GND Must contact PCB ground
Table 5. Pin Descriptions
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For price, delivery and to place orders: Hittite Microwave Corporation, 2 Elizabeth Drive, Chelmsford, MA 01824
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HMC976LP3E
400mA LOW NOISE, HIGH PSRR
LINEAR VOLTAGE REGULATOR
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Evaluation PCB
Item Contents Part Number
Evaluation PCB HM976LP3E Evaluation PCB 131671-HMC976LP3E
Table 6. Ordering Information
Item Contents
J1 PCB Mount SMA connector
J3 3 Pin Header
JP4, JP6, JP7, JP8, 2 Pin Header and Jumper
C10, C12, C21 4.7µF Capacitor 0603 Pkg.
C11 0.1µF Capacitor 0402 Pkg.
R13 0.2 Ohm Resistor 0402 Pkg.
R3 1 Ohm Resistor 0402 Pkg.
R8 100 kOhm Resistor 0402 Pkg.
TP1, TP3 Test Point PC Compact Red
TP2 Test Point PC Compact Black
U1 HMC976LP3E 400mA Low Noise, High PSRR
Linear Voltage Regulator
PCB 131669 Eval Board
Table 7. List of Materials for Evaluation PCB 131671
POWER CONDITIONING - SMT
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For price, delivery and to place orders: Hittite Microwave Corporation, 2 Elizabeth Drive, Chelmsford, MA 01824
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HMC976LP3E
400mA LOW NOISE, HIGH PSRR
LINEAR VOLTAGE REGULATOR
v0 2.1112
Operational Features
The recommended conguration is “HMC976LP3E 4.8V User Application Schematic”. This is for the default output
voltage of 4.8V nominal. The values shown are those recommended for optimum Noise Spectral density. For users
requiring extremely low noise in the 1 MHz to 10 MHz range the largest output capacitor should be used: a 68uF takes
the noise between 100 kHz and 1 MHz to below 2.5nV/√Hz.
Load Capacitor Characteristics
The HMC976LP3E was designed to work with a low ESR ceramic load capacitor on the VRX pin (C21 in the
schematic above). Low ESR ceramic capacitors are very small and best for eliminating high frequency noise. Ceramic
capacitors can vary as much as 50% versus temperature and 60% versus voltage, dependant on the ceramic type
e.g. Z5U, Y5V, X7R or X5R. There are no restrictions on ceramic type or minimum ESR, only that the user must
guarantee that the minimum output capacitance over operating conditions is 4.7μF, smaller values can result in noise
peaking or lower stability.
Figure 13. Evaluation PCB Schematic
POWER CONDITIONING - SMT
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For price, delivery and to place orders: Hittite Microwave Corporation, 2 Elizabeth Drive, Chelmsford, MA 01824
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HMC976LP3E
400mA LOW NOISE, HIGH PSRR
LINEAR VOLTAGE REGULATOR
v0 2.1112
Output Voltage Adjustment
The default output voltage is 4.8V this conguration “HMC976LP3E 4.8V User Application Schematic”.
The output voltage can be set to 5V by a ground on HV pin 5 “HMC976LP3E 5V User Application Schematic”.
The output voltage can be set from 1.8V to <4.8V by a resistor from pin 2 to the output pin 11 shown in
“HMC976LP3E 3.3V User Application Schematic”. The value of the resistor is given by the equation below.
If the temperature stability performance similar to that shown in the plot “Vout=5V and Vref vs. Temperature” is
required, then any external resistor temperature coefficient is a critical parameter and should be better than 50ppm
and 1% tolerance. Please note that the temperature coefficient of the internal resistor feedback divider is 270ppm/°C.
Layout of PCB
The layout of the PCB should follow these guide lines, the PADDLE should be connected to ground with at least 5 vias
directly under the paddle to the bottom side ground plane. To ensure the noise and PSRR specications are met,
the capacitors connecting to Pins 15, 11, 3 (see user application schematics), should be placed as close as possible
to the relevant pin and the ground connection should be as short as possible. Trace widths and via sizes should be
scaled to match the current drawn. The use of a large ground plane is recommended with a large number of ground
vias near the device to carry the ground.
Thermal Protection
The HMC976LP3E includes an integrated thermal protection circuit. If the junction temperature of the HMC976LP3E
reaches the maximum operating junction temperature (115°C max, 130°C typical) then the thermal protection circuit
temporarily disables the HMC976LP3E outputs (with ~500uA output current) until the junction temperature cools down
by approximately 10°C.
A typical reason for the increase of the junction temperature is an unexpected increase in current draw. By disabling
the outputs, the HMC976LP3E is in this case protecting the other devices on the PCB that it is supplying with current.
The thermal protection circuitry will also indirectly protect against a short circuit at the output. After the overload or the
fault condition is removed or changed, the regulator output returns to the nominal operation
For reliable long term operation the “Recommended Operating Condition” must be followed and the maximum junc-
tion temperature must not be exceeded. The junction temperature for a given dissipation can be calculated from the
equation below:
Where Tj=Junction Temperature (°C), Ta=Ambient Temperature (°C), Pd=Dissipated Power (W) =Thermal
Resistivity Junction to Ambient (°C/W). Please refer to Table 2 for thermal resistance values.
⎟
⎠
⎞
⎜
⎝
⎛
−
⎟
⎠
⎞
⎜
⎝
⎛
−
⎟
⎠
⎞
⎜
⎝
⎛
−
⎟
⎠
⎞
⎜
⎝
⎛
=
1
17.1
*32.01
9.18*1
17.1
1
Vout
Vout
R
(Kohms)
TT P
jadja
=+ ×
θ
θ
ja
POWER CONDITIONING - SMT
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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
v0 2.1112
Thermal dissipation should be taken into account at all times especially with large dropout voltages VDD-VR, i.e.
if 1.8V output is required from 5.5V input voltage, then the output current must be restricted to <210mA , or VDD
restricted to <3.75V for a 400mA load.
The exact maximum operating temperature before the thermal protection circuit activates is largely dependent on
the customer PCB design. Below is an example for maximum ambient temperature calculation for the standard
HMC976LP3E evaluation PCB with no heat sink and no air ow (fans). Customers should perform this calculation for
their PCB layout and operating conditions.
VIN=5.5V, Vout=5.0V, Iout=400mA
Vdropout=VIN-VOUT=0.5V
Dissipated power on regulator Pd=0.5Vx0.4A=0.2W
=51.5°C/ W
Junction temperature increase using standard HMC976 board: DTj=Pd x =10.3°C. Thermal shutdown
junction temperature of regulator (absolute min) Tsdwn=+115°C. Maximum corresponding ambient temperature
Ta_max = Tsdwn - DTj = +104.7°C
The plots below show how the PCB ground copper area affects the HMC976LP3E junction temperature for different
HMC976LP3E power dissipation conditions. The following cases are included in the plots:
1. 100 mm2 Copper Area
2. 1000 mm2 Copper Area
3. 2580 mm2 Copper Area HMC976LP3E Evaluation PCB No Heat Sink (HS)
4. 2580 mm2 Copper Area HMC976LP3E Evaluation PCB with Heat Sink (HS)
5. JEDEC Board as per JESD51-3
The typical corresponding is shown in Table 8:
25
50
75
100
125
150
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1
JUNCTION TEMPERATURE Tj (°C)
POWER DISSIPATION (W)
Tjmax
JEDEC no HS
2580mm2 with HS
2580mm2 no HS
1000mm2 no HS
100mm2 no HS
115°C WORST CASE
THERMAL SHUTDOWN
25
50
75
100
125
150
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1
JUNCTION TEMPERATURE Tj (°C)
POWER DISSIPATION (W)
100mm2 no HS
2580mm2 with HS
2580mm2 no HS
1000mm2 no HS
Tjmax
JEDEC no HS
115°C WORST CASE
THERMAL SHUTDOWN
Table 8. Typical for specied PCB Copper Sizes
Copper size (mm2) (°C/W)
100 173.5
1000 57. 3
2580 no HS 51.5
2580 with HS 44
θ
ja
θ
ja
θ
ja
θ
ja
Figure 14. HMC976LP3E JUNCTION TEMPERATURE
°C vs. TOTAL POWER DISSIPATION 25°C AMBIENT
Figure 15. HMC976LP3E JUNCTION TEMPERATURE
°C vs. TOTAL POWER DISSIPATION 50°C AMBIENT
θ
ja
POWER CONDITIONING - SMT
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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
v0 2.1112
25
50
75
100
125
150
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1
JUNCTION TEMPERATURE Tj (°C)
POWER DISSIPATION (W)
Tjmax
1000mm2 no HS
2580mm2 no HS
2580mm2 with HS
100 mm2 no HS
JEDEC no HS
115°C WORST CASE
THERMAL SHUTDOWN
Figure 16. HMC976LP3E JUNCTION TEMPERATURE
°C vs. TOTAL POWER DISSIPATION 85°C AMBIENT
Figure 17. HMC976LP3E 3.3V User Application Schematic
POWER CONDITIONING - SMT
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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
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HMC976LP3E
400mA LOW NOISE, HIGH PSRR
LINEAR VOLTAGE REGULATOR
v0 2.1112
Figure 18. HMC976LP3E 4.8V User Application Schematic
Figure 19. HMC976LP3E 5V User Application Schematic
