HMC976LP3E [ADI]
400 mA Low Noise, High PSRR Linear Voltage Regulator;
| 型号： | HMC976LP3E |
| 厂家： | 
ADI |
| 描述： | 400 mA Low Noise, High PSRR Linear Voltage Regulator PC 信息通信管理 输出元件 调节器 |
| 文件： | 总13页 (文件大小：1103K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
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
For price, delivery, and to place orders: Analog Devices, Inc.,
responsibilityisassumedbyAnalogDevicesforitsuse, nor for anyinfringementsofpatentsor other
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106
rights of third parties that may result from its use. Specifications subject to change without notice. No
Phone: 781-329-4700 • Order online at www.analog.com
Application Support: Phone: 1-800-ANALOG-D
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.
1
HMC976* PRODUCT PAGE QUICK LINKS
Last Content Update: 02/23/2017
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DESIGN RESOURCES
• HMC976 Material Declaration
• PCN-PDN Information
EVALUATION KITS
• HMC976LP3E Evaluation Board
• Quality And Reliability
• Symbols and Footprints
DOCUMENTATION
Data Sheet
DISCUSSIONS
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• HMC976 Data Sheet
SAMPLE AND BUY
REFERENCE MATERIALS
Visit the product page to see pricing options.
Quality Documentation
TECHNICAL SUPPORT
Submit a technical question or find your regional support
number.
• Package/Assembly Qualification Test Report: 16L 3x3mm
QFN Package (QTR: 11003 REV: 02)
• Package/Assembly Qualification Test Report: LP2, LP2C,
LP3, LP3B, LP3C, LP3D, LP3F, LP3G (QTR: 2014-0364)
• Semiconductor Qualification Test Report: BiCMOS-A (QTR:
2013-00235)
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HMC976LP3E
v02.1112
400mA LOW NOISE, HIGH PSRR
LINEAR VOLTAGE REGULATOR
Table 1. Electrical Specifications (Continued)
Parameter
Conditions
Min
Typ
Max
400
Units
V
Vdd = 5.5V; REF cannot source/sink
external current
Reference Voltage VREF
Output Current VR [1]
1.17
TA = -40°C to +85°C
mA
Output Noise Spectral Density
10 Hz
100 Hz
1 kHz
10 kHz
100 kHz
4000
120
6
3
3
Vdd = 5.5V; VR = 5.0V
Measured on Application Schematic [3]
nV/rtHz
Maximum Load Current
Integrated Output Noise 100 Hz to 100 kHz
Load Regulation, VR
Vdd = 5.5V; VR = 5.0V [3]
Vdd = 5.5V; VR=5.0V
1.5
µVrms
0.01
% / mA
PSRR
1 kHz
-70
-65
-45
-35
-30
-20
10 kHz
100 kHz
1 MHz
10 MHz
50 MHz
Vdd = 5.5V; VR=5.0V
Maximum load current
dB
Output Voltage Variation vs. Package
Base Temperature
25°C to 85°C
Vdd = 5.5V; VR=5.0V
Maximum load current
0.005
0.005
0.01
0.01
% / °C
% / °C
-40°C to 25°C
Ven = Vdd = 5.5V;
Maximum Load Current
Current Consumption (IGND
)
1.1
1.5
1
mA
µA
ms
Vdd = 5.5V; EN = Low; Output is float-
ing (high - impedance) in Power-Down
mode
Power Down Current
0 to 90% of final voltage
Vdd = 5.5V[3]
Start-Up Transient Time
200
Enable Input EN High Level
Enable Input EN Low Level
Vdd>=VEN
Vdd>=VEN
2
0
Vdd
0.8
V
V
To guarantee stability, noise and PSRR
performance [3]
Output Load Capacitance [2]
4.7
µF
Thermal Protection Threshold Junction
Temperature [4]
Junction Temperature Rising
115
130
10
°C
°C
Thermal Protection Hysteresis
[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
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
For price, delivery, and to place orders: Analog Devices, Inc.,
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106
rights of third parties that may result from its use. Specifications subject to change without notice. No
Phone: 781-329-4700 • Order online at www.analog.com
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
2
Application Support: Phone: 1-800-ANALOG-D
Trademarks and registered trademarks are the property of their respectiveowners.
HMC976LP3E
v02.1112
400mA LOW NOISE, HIGH PSRR
LINEAR VOLTAGE REGULATOR
Figure 1. Vout=5V Output Noise
Spectral Density
Figure 2. Vout=3.3V Output Noise
Spectral Density
[1]
[2]
10-5
10-6
10-7
10-8
10-9
10-10
10-5
C3=1uF
C2=10uF
10-6
C3=1uF
C2=1uF
C3=4.7uF
C2=4.7uF
10-7
10-8
10-9
C3=4.7uF
C2 =4.7uF
C3=4.7uF
C2=10uF
10-10
101
102
103
104
105
106
107
108
101
102
103
104
105
106
107
108
FREQUENCY (Hz)
FREQUENCY (Hz)
Figure 3. Vout 4.8V PSRR vs.
Vin-Vout
Figure 4. Vout=3.3V PSRR vs.
Vin-Vout
[3]
[2]
-20
-20
-30
-40
-50
-60
-70
-80
-90
VIN-VOUT=0.5V
VIN-VOUT=0.25V
-30
-40
-50
-60
-70
-80
VIN-VOUT=0.4V
VIN-VOUT=0.8V
VIN-VOUT=0.6V
VIN-VOUT=0.8V
VIN-VOUT=1.0V
VIN-VOUT=1.7V
102
103
104
105
106
107
108
102
103
104
105
106
107
108
FREQUENCY (Hz)
FREQUENCY (Hz)
Figure 6. Vout=5V and Vref vs.
Temperature
Figure 5. Vout=5V and Vref vs.
Temperature
[1,4]
[1,4]
4.975
0.6
1.175
1.170
1.165
1.160
1.155
1.150
5.00
4.90
4.80
4.70
4.60
4.50
4.40
25C
85C
-40
VREF
0.5
0.4
0.3
0.2
0.1
0
4.970
4.965
4.960
VR
4.955
4.950
4
4.2
4.4
4.6
4.8
5
5.2
5.4
5.6
-40 -30 -20 -10
0
10 20 30 40 50 60 70 80 90
TEMPERATURE (°C)
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.
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
For price, delivery, and to place orders: Analog Devices, Inc.,
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106
rights of third parties that may result from its use. Specifications subject to change without notice. No
Phone: 781-329-4700 • Order online at www.analog.com
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
3
Application Support: Phone: 1-800-ANALOG-D
Trademarks and registered trademarks are the property of their respectiveowners.
HMC976LP3E
v02.1112
400mA LOW NOISE, HIGH PSRR
LINEAR VOLTAGE REGULATOR
Figure 8. Output Load Switched
ON to OFF [1]
Figure 7. Output Load Switched
OFF to ON [1]
500
400
300
200
100
0
500
5.08
5.04
5.08
VR Output
400
300
200
100
0
5.04
5.00
4.96
4.92
5.00
4.96
VR Output
CURRENT
4.92
4.88
CURRENT
4.88
-5
0
5
10
15
20
25
30
35
40
45
-5
0
5
10
15
20
25
30
35
40
45
TIME (ms)
TIME (ms)
Figure 10. Supply Turn-Off Transient [2]
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
4.00
4.00
3.50
3.00
2.50
2.00
1.50
1.00
0.500
0.00
4.00
ENA
3.50
3.50
3.00
2.50
2.00
1.50
3.00
ENA
2.50
2.00
VR Output
1.50
1.00
VR Output
1.00
0.500
0.00
0.500
0.00
450
-0.200
0.00
0.200
0.400
TIME (s)
0.600
0.800
-50
0
50
100
150
200
250
300
350
400
TIME (ms)
Figure 11. HMC976LP3E Output Noise
Spectral Density vs. Commercial PSU [1]
Figure 12. Vout vs. Load current [1]
10-5
10-6
10-7
10-8
10-9
10-10
5.050
5.030
5.010
4.990
4.970
4.950
Commercial PSU Output
Input to regulator
HMC976LP3E Output
0
50
100
150
200
250
300
350
400
101
102
103
104
105
106
107
108
LOAD CURRENT mA
FREQUENCY (Hz)
[1] VDD=5.5V, 400mA Load ““HMC976LP3E 5V User Application Schematic”.
[2] VDD=5.0V, 400mA Load “HMC976LP3E 3.3V User Application Schematic”
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
For price, delivery, and to place orders: Analog Devices, Inc.,
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106
rights of third parties that may result from its use. Specifications subject to change without notice. No
Phone: 781-329-4700 • Order online at www.analog.com
Application Support: Phone: 1-800-ANALOG-D
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
4
Trademarks and registered trademarks are the property of their respectiveowners.
HMC976LP3E
v02.1112
400mA LOW NOISE, HIGH PSRR
LINEAR VOLTAGE REGULATOR
Table 2. Absolute Maximum Ratings
Vdd to GND Voltage
EN to GND Voltage
+5.8V / -0.3V
+5.8V /-0.3V
+5.8V / -0.3V
780mW
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.
RDx / HVx to GND Voltage
Maximum Dissipation
Thermal Resistance
(Junction to Ambient)
51.5 °C/W [3]
18 °C/W
Thermal Resistance (Junction to
Case, Ground Paddle)
Maximum Junction Temperature
Max Output Current
+150 °C
420 mA
ELECTROSTATIC SENSITIVE DEVICE
OBSERVE HANDLING PRECAUTIONS
Storage Temperature
-65 to +150 °C
Class 1C
ESD Sensitivity (HBM)
Table 3. Recommended Operating Condition
Parameter
Condition
Min.
Typ.
Max.
115
85
Units
Junction Temperature
Ambient Temperature
°C
-40
°C
Outline Drawing
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
Part Number
Package Body Material
Lead Finish
MSL Rating
MSL1 [2]
Package Marking [1]
976
XXX
X
HMC976LP3E
RoHS-compliant Low Stress Injection Molded Plastic
100% matte Sn
[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
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
For price, delivery, and to place orders: Analog Devices, Inc.,
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106
rights of third parties that may result from its use. Specifications subject to change without notice. No
Phone: 781-329-4700 • Order online at www.analog.com
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
5
Application Support: Phone: 1-800-ANALOG-D
Trademarks and registered trademarks are the property of their respectiveowners.
HMC976LP3E
v02.1112
400mA LOW NOISE, HIGH PSRR
LINEAR VOLTAGE REGULATOR
Table 5. Pin Descriptions
Pin Number
Function
Description
Interface Schematic
Enable Input, TTL Logic Level. The VR and VRX outputs
are floating (high impedance) when EN = Low.
1
EN
Resistive feedback for VR,
see “Output Voltage Adjust” section.
2
RD
Reference voltage (bandgap) output. Cannot be used to
source/sink current to/from external circuits
3
REF
For Decoupling Capacitor
Cannot be used to source current to external circuits
4
VRX
VR
11
Regulator Output VR 400mA
5
HV
Sets VR to 5V output when grounded
These pins can be left unconnected or connected to GND
with no change in performance
6 - 10, 12 - 14,16
N/C
15
VDD
Unregulated power supply input 5.5V max
Package Base
GND
Must contact PCB ground
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
For price, delivery, and to place orders: Analog Devices, Inc.,
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106
rights of third parties that may result from its use. Specifications subject to change without notice. No
Phone: 781-329-4700 • Order online at www.analog.com
Application Support: Phone: 1-800-ANALOG-D
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
6
Trademarks and registered trademarks are the property of their respectiveowners.
HMC976LP3E
v02.1112
400mA LOW NOISE, HIGH PSRR
LINEAR VOLTAGE REGULATOR
Evaluation PCB
Table 6. Ordering Information
Item
Contents
Part Number
Evaluation PCB
HM976LP3E Evaluation PCB
131671-HMC976LP3E
Table 7. List of Materials for Evaluation PCB 131671
Item
Contents
J1
PCB Mount SMA connector
3 Pin Header
J3
JP4, JP6, JP7, JP8,
2 Pin Header and Jumper
C10, C12, C21
4.7µF Capacitor 0603 Pkg.
0.1µF Capacitor 0402 Pkg.
0.2 Ohm Resistor 0402 Pkg.
1 Ohm Resistor 0402 Pkg.
100 kOhm Resistor 0402 Pkg.
Test Point PC Compact Red
Test Point PC Compact Black
C11
R13
R3
R8
TP1, TP3
TP2
U1
HMC976LP3E 400mA Low Noise, High PSRR
Linear Voltage Regulator
PCB
131669 Eval Board
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
For price, delivery, and to place orders: Analog Devices, Inc.,
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106
rights of third parties that may result from its use. Specifications subject to change without notice. No
Phone: 781-329-4700 • Order online at www.analog.com
Application Support: Phone: 1-800-ANALOG-D
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
7
Trademarks and registered trademarks are the property of their respectiveowners.
HMC976LP3E
v02.1112
400mA LOW NOISE, HIGH PSRR
LINEAR VOLTAGE REGULATOR
Figure 13. Evaluation PCB Schematic
Operational Features
The recommended configuration 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.
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
For price, delivery, and to place orders: Analog Devices, Inc.,
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106
rights of third parties that may result from its use. Specifications subject to change without notice. No
Phone: 781-329-4700 • Order online at www.analog.com
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
8
Application Support: Phone: 1-800-ANALOG-D
Trademarks and registered trademarks are the property of their respectiveowners.
HMC976LP3E
v02.1112
400mA LOW NOISE, HIGH PSRR
LINEAR VOLTAGE REGULATOR
Output Voltage Adjustment
The default output voltage is 4.8V this configuration “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.
⎛ Vout
⎞
⎛
⎞
⎟
⎠
−1 *18.9
⎜
⎝
⎟
⎜
⎝
1.17
⎠
R1=
(Kohms)
⎛ Vout
⎞
⎟
⎛
⎞
⎟
⎠
1− 0.32*
−1
⎜
⎝
⎜
⎝
1.17
⎠
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 specifications 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:
T =T +P ×θ
a
j
d
ja
Where Tj=Junction Temperature (°C), Ta=Ambient Temperature (°C), Pd=Dissipated Power (W)
Resistivity Junction to Ambient (°C/W). Please refer to Table 2 for thermal resistance values.
=Thermal
θja
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
For price, delivery, and to place orders: Analog Devices, Inc.,
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106
rights of third parties that may result from its use. Specifications subject to change without notice. No
Phone: 781-329-4700 • Order online at www.analog.com
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
9
Application Support: Phone: 1-800-ANALOG-D
Trademarks and registered trademarks are the property of their respectiveowners.
HMC976LP3E
v02.1112
400mA LOW NOISE, HIGH PSRR
LINEAR VOLTAGE REGULATOR
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 flow (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
θja
θja
Junction temperature increase using standard HMC976 board: DTj=Pd x
junction temperature of regulator (absolute min) Tsdwn=+115°C. Maximum corresponding ambient temperature
Ta_max = Tsdwn - DTj = +104.7°C
=10.3°C. Thermal shutdown
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 correspondingθja is shown in Table 8:
Table 8. Typical θja for specified PCB Copper Sizes
Copper size (mm2)
(°C/W)
θja
100
173.5
57.3
51.5
44
1000
2580 no HS
2580 with HS
Figure 15. HMC976LP3E JUNCTION TEMPERATURE
Figure 14. HMC976LP3E JUNCTION TEMPERATURE
°C vs. TOTAL POWER DISSIPATION 50°C AMBIENT
°C vs. TOTAL POWER DISSIPATION 25°C AMBIENT
150
150
115°C WORST CASE
115°C WORST CASE
THERMAL SHUTDOWN
THERMAL SHUTDOWN
125
125
Tjmax
Tjmax
1000mm2 no HS
2580mm2 no HS
100mm2 no HS
100mm2 no HS
100
100
75
1000mm2 no HS
2580mm2 with HS
2580mm2 no HS
75
2580mm2 with HS
JEDEC no HS
50
50
JEDEC no HS
0.8 0.9 1
25
25
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
POWER DISSIPATION (W)
POWER DISSIPATION (W)
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
For price, delivery, and to place orders: Analog Devices, Inc.,
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106
rights of third parties that may result from its use. Specifications subject to change without notice. No
Phone: 781-329-4700 • Order online at www.analog.com
Application Support: Phone: 1-800-ANALOG-D
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
10
Trademarks and registered trademarks are the property of their respectiveowners.
HMC976LP3E
v02.1112
400mA LOW NOISE, HIGH PSRR
LINEAR VOLTAGE REGULATOR
Figure 16. HMC976LP3E JUNCTION TEMPERATURE
°C vs. TOTAL POWER DISSIPATION 85°C AMBIENT
150
115°C WORST CASE
THERMAL SHUTDOWN
125
Tjmax
100
1000mm2 no HS
2580mm2 no HS
2580mm2 with HS
75
100 mm2 no HS
JEDEC no HS
50
25
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
POWER DISSIPATION (W)
Figure 17. HMC976LP3E 3.3V User Application Schematic
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
For price, delivery, and to place orders: Analog Devices, Inc.,
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106
rights of third parties that may result from its use. Specifications subject to change without notice. No
Phone: 781-329-4700 • Order online at www.analog.com
Application Support: Phone: 1-800-ANALOG-D
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
11
Trademarks and registered trademarks are the property of their respectiveowners.
HMC976LP3E
v02.1112
400mA LOW NOISE, HIGH PSRR
LINEAR VOLTAGE REGULATOR
Figure 18. HMC976LP3E 4.8V User Application Schematic
Figure 19. HMC976LP3E 5V User Application Schematic
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
For price, delivery, and to place orders: Analog Devices, Inc.,
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106
rights of third parties that may result from its use. Specifications subject to change without notice. No
Phone: 781-329-4700 • Order online at www.analog.com
Application Support: Phone: 1-800-ANALOG-D
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
12
Trademarks and registered trademarks are the property of their respectiveowners.
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