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CS5207-3 7.0 A, 3.3 V Fixed Linear Regulator
The CS5207-3 linear regulator provides 7.0 A @ 3.3 V with an accuracy of 2.0 %. The regulator is intended for use as post regulator and microprocessor supply. The fast loop response and low dropout voltage make these regulators ideal for applications where low voltage operation and good transient response are important. The circuit is designed to operate with dropout voltages as low as 1.0 V depending on the output current level. The maximum quiescent current is only 10 mA at full load. The regulator is fully protected against overload conditions with protection circuitry for Safe Operating Area (SOA), overcurrent and thermal shutdown. The CS5207-3 is available in TO-220-3 and surface mount D2PAK-3 packages.
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TO-220-3 T SUFFIX CASE 221A 1
2
3 D2PAK-3 DP SUFFIX CASE 418AB
Tab = VOUT Pin 1. GND 2. VOUT 3. VIN
* * * * *
Output Current to 7.0 A Output Voltage Trimmed to 2.0% Dropout Voltage 1.4 V @ 7.0 A Fast Transient Response Fault Protection Circuitry - Thermal Shutdown - Overcurrent Protection - Safe Area Protection
12
3
MARKING DIAGRAMS
TO-220-3 D2PAK-3
CS5207-3 AWLYWW
CS5207-3 AWLYWW
VOUT VIN 1 A WL, L YY, Y WW, W
1
Output Current Limit Thermal Shutdown - + Error Amplifier
= Assembly Location = Wafer Lot = Year = Work Week
ORDERING INFORMATION
Device CS5207-3GT3 GND CS5207-3GDP3 CS5207-3GDPR3 Package TO-220-3 D2PAK-3 D2PAK-3 Shipping 50 Units/Rail 50 Units/Rail 750 Tape & Reel
Bandgap
Figure 1. Block Diagram
For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specifications Brochure, BRD8011/D.
(c) Semiconductor Components Industries, LLC, 2004
1
January, 2004 - Rev. 6
Publication Order Number: CS5207-3/D
CS5207-3
MAXIMUM RATINGS*
Parameter Supply Voltage, VCC Operating Temperature Range Junction Temperature Storage Temperature Range Lead Temperature Soldering: 1. 10 second maximum. 2. 60 second maximum above 183C *The maximum package power dissipation must be observed. Wave Solder (through hole styles only) Note 1 Reflow (SMD styles only) Note 2 Value 17 -40 to +70 150 -60 to +150 260 Peak 230 Peak Unit V C C C C C
ELECTRICAL CHARACTERISTICS (CIN = 10 F, COUT = 22 F Tantalum, VIN - VOUT = 3.0 V, VIN 15 V, 0C TA 70C,
TJ +150C, unless otherwise specified, Ifull load = 7.0 A) Characteristic 3.3 V Fixed Output Voltage Output Voltage (Notes 3 and 4) Line Regulation Load Regulation (Notes 3 and 4) Dropout Voltage (Note 5) Current Limit Quiescent Current Thermal Regulation Ripple Rejection Temperature Stability RMS Output Noise (%VOUT) Thermal Shutdown Thermal Shutdown Hysteresis VIN - VOUT = 1.6 V; 10 mA IOUT 7.0 A 1.6 V VIN - VOUT 6.0 V; IOUT = 10 mA VIN - VOUT = 1.6 V; 10 mA IOUT 7.0 A IOUT = 7.0 A VIN - VOUT = 3.0 V; TJ 25C VIN - VOUT = 9.0 V VIN 9.0 V; IOUT = 10 mA 30 ms Pulse, TA = 25C f = 120 Hz; IOUT = 7.0 A - 10 Hz f 10 kHz; TA = 25C - - 3.234 (-2.0%) - - - 7.1 - - - - - - 150 - 3.300 0.04 0.13 1.4 8.5 1.0 5.0 0.003 80 0.5 0.003 180 25 3.366 (+2.0%) 0.20 0.5 1.55 - - 10 - - - - - - V % % V A A mA %W dB % %VOUT C C Test Conditions Min Typ Max Unit
3. Load regulation and output voltage are measured at a constant junction temperature by low duty cycle pulse testing. Changes in output voltage due to thermal gradients or temperature changes must be taken into account seperately. 4. Specifications apply for an external Kelvin sense connection at a point on the output pin 1/4" from the bottom of the package. 5. Dropout voltage is a measurement of the minimum input/output differential at full load. PACKAGE PIN DESCRIPTION Package Pin Number TO-220-3 1 2 3 D2PAK-3 1 2 3 Pin Symbol GND VOUT VIN Ground connection. Regulated output voltage (case). Input voltage. Function
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CS5207-3
TYPICAL PERFORMANCE CHARACTERISTICS
1.55 1.50 1.45 1.40 1.35 1.30 1.25 1.20 1.15 1.10 1.05 1.00 0.95 0.90 0.85 0.80 0.75 0.70
0
0.10 0.08 Output Voltage Deviation (%)
6 7
0.06 0.04 0.02 0.00 -0.02 -0.04 -0.06 -0.08 -0.10 -0.12
Dropout Voltage (V)
TCASE = 0C TCASE = 25C
TCASE = 125C
1
2
3
4
5
0
10 20 30 40 50 60 70 80 90 100 110 120 130
Output Current (A)
TJ (C)
Figure 2. Dropout Voltage vs. Output Current
0.200 Output Voltage Deviation (%) 0.175 0.150 0.125 0.100 0.075 0.050
TCASE = 0C TCASE = 25C TCASE = 125C
Figure 3. Output Voltage vs. Temperature
100 90 80 Ripple Rejection (dB) 70 60 50 40 30 20 10
0 1 2 3 4 5 6 7 TCASE = 25C
IOUT = 7.0 A (VIN - VOUT) = 3.0 V VRIPPLE = 1.6 VPP
0.025 0.000 Output Current (A)
0
101
102
103
104
105
Frequency (Hz)
Figure 4. Load Regulation vs. Output Current
Figure 5. Ripple Rejection vs. Frequency
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CS5207-3
APPLICATIONS INFORMATION The CS5207-3 linear regulator provides a fixed 3.3 V output currents up to 7.0 A. The regulator is protected against short circuit, and includes thermal shutdown and safe area protection (SOA) circuitry. The SOA protection circuitry decreases the maximum available output current as the input-output differential voltage increase. The CS5207-3 has a composite PNP-NPN output transistor and requires an output capacitor for stability. A detailed procedure for selecting this capacitor is included in the Stability Considerations section.
Stability Considerations Protection Diodes
The output or compensation capacitor helps determine three main characteristics of a linear regulator: start-up delay, load transient response, and loop stability. The capacitor value and type is based on cost, availability, size and temperature constraints. A tantalum or aluminum electrolytic capacitor is best, since a film or ceramic capacitor with almost zero ESR can cause instability. The aluminum electrolytic capacitor is the least expensive solution. However, when the circuit operates at low temperatures, both the value and ESR of the capacitor will vary considerably. The capacitor manufacturer's data sheet provides this information. A 22 F tantalum capacitor will work for most applications, but with high current regulators such as the CS5207-3 the transient response and stability improve with higher values of capacitance. The majority of applications for this regulator involve large changes in load current so the output capacitor must supply the instantaneous load current. The ESR of the output capacitor causes an immediate drop in output voltage given by:
DV + DI ESR
When large external capacitors are used with a linear regulator it is sometimes necessary to add protection diodes. If the input voltage of the regulator gets shorted, the output capacitor will discharge into the output of the regulator. The discharge current depends on the value of the capacitor, the output voltage and the rate at which VIN drops. In the CS5207-3 regulator, the discharge path is through a large junction and protection diodes are not usually needed. If the regulator is used with large values of output capacitance and the input voltage is instantaneously shorted to ground, damage can occur. In this case, a diode connected as shown in Figure 6 is recommended.
IN4002 (Optional) VIN VIN C1 GND VOUT C2 CS5207-3 VOUT
Figure 6. Protection Diode Scheme for Fixed Output Regulator Output Voltage Sensing
Since the CS5207-3 is a three terminal regulator, it is not possible to provide true remote load sensing. Load regulation is limited by the resistance of the conductors connecting the regulator to the load. Best load regulation occurs when the regulator is connected to the load as shown in Figure 7.
Conductor Parasitic Resistance
For microprocessor applications it is customary to use an output capacitor network consisting of several tantalum and ceramic capacitors in parallel. This reduces the overall ESR and reduces the instantaneous output voltage drop under transient load conditions. The output capacitor network should be as close to the load as possible for the best results.
VIN
VIN
VOUT CS5207-3
RC
RLOAD
Figure 7. Grounding Scheme for the Output Regulator to Minimize Parasitics
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CS5207-3
Calculating Power Dissipation and Heat Sink Requirements
The CS5207-3 linear regulator includes thermal shutdown and safe operating area circuitry to protect the device. High power regulators such as these usually operate at high junction temperatures so it is important to calculate the power dissipation and junction temperatures accurately to ensure that an adequate heat sink is used. The case is connected to VOUT on the CS5207-3, electrical isolation may be required for some applications. Thermal compound should always be used with high current regulators such as these. The thermal characteristics of an IC depend on the following four factors: 1. 2. 3. 4. Maximum Ambient Temperature TA (C) Power dissipation PD (Watts) Maximum junction temperature TJ (C) Thermal resistance junction to ambient RJA (C/W) These four are related by the equation
TJ + TA ) PD RQJA
(1)
A heat sink effectively increases the surface area of the package to improve the flow of heat away from the IC and into the surrounding air. Each material in the heat flow path between the IC and the outside environment has a thermal resistance. Like series electrical resistances, these resistances are summed to determine RJA, the total thermal resistance between the junction and the surrounding air. 1. Thermal Resistance of the junction to case, RJC (C/W) 2. Thermal Resistance of the case to Heat Sink, RCS (C/W) 3. Thermal Resistance of the Heat Sink to the ambient air, RSA (C/W) These are connected by the equation:
RQJA + RQJC ) RQCS ) RQSA
(3)
The maximum ambient temperature and the power dissipation are determined by the design while the maximum junction temperature and the thermal resistance depend on the manufacturer and the package type. The maximum power dissipation for a regulator is:
PD(max) + {VIN(max) * VOUT(min)}IOUT(max) ) VIN(max)IQ (2)
where: VIN(max) is the maximum input voltage, VOUT(min) is the minimum output voltage, IOUT(max) is the maximum output current, for the application IQ is the maximum quiescent current at IOUT(max).
The value for RJA is calculated using equation (3) and the result can be substituted in equation (1). RJC is 1.6C/Watt for the CS5207-3. For a high current regulator such as the CS5207-3 the majority of the heat is generated in the power transistor section. The value for RSA depends on the heat sink type, while RCS depends on factors such as package type, heat sink interface (is an insulator and thermal grease used?), and the contact area between the heat sink and the package. Once these calculations are complete, the maximum permissible value of RJA can be calculated and the proper heat sink selected. For further discussion on heat sink selection, see application note "Thermal Management," document number AND8036/D, available through the Literature Distribution Center or via our website at http://onsemi.com.
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CS5207-3
PACKAGE DIMENSIONS
TO-220-3 T SUFFIX CASE 221A-08 ISSUE AA
-T- -B- F C S
SEATING PLANE NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: INCH. DIM A B C D F G H J K L N Q R S T U V INCHES MIN MAX 0.560 0.625 0.380 0.420 0.140 0.190 0.025 0.035 0.139 0.155 0.100 BSC --- 0.280 0.012 0.045 0.500 0.580 0.045 0.060 0.200 BSC 0.100 0.135 0.080 0.115 0.020 0.055 0.235 0.255 0.000 0.050 0.045 --- MILLIMETERS MIN MAX 14.23 15.87 9.66 10.66 3.56 4.82 0.64 0.89 3.53 3.93 2.54 BSC --- 7.11 0.31 1.14 12.70 14.73 1.15 1.52 5.08 BSC 2.54 3.42 2.04 2.92 0.51 1.39 5.97 6.47 0.00 1.27 1.15 ---
T
4
Q
123
A U K H
-Y-
L V G D 3 PL 0.25 (0.010) N
M
R J B
M
Y
D2PAK-3 DP SUFFIX CASE 418AB-01 ISSUE O
For D2PAK Outline and Dimensions - Contact Factory
PACKAGE THERMAL DATA Parameter RJC RJA Typical Typical TO-220-3 1.6 50 D2PAK-3 1.6 10-50* Unit C/W C/W
* Depending on thermal properties of substrate. RJA = RJC + RCA
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CS5207-3
Notes
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CS5207-3
ON Semiconductor and are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. "Typical" parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including "Typicals" must be validated for each customer application by customer's technical experts. SCILLC does not convey any license under its patent rights nor the rights of others. SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur. Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner.
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CS5207-3/D

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