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CS5203-3 3.0 A, 3.3 V Fixed Linear Regulator
The CS5203-3 linear regulator provides 3.3 V reference at 3.0 A with an output voltage accuracy of 1.5%. This regulator is intended for use as a post regulator and microprocessor supply. The fast loop response and low dropout voltage make this regulator ideal for applications where low voltage operation and good transient response are important. The circuit is designed to provide 3.0 A of output current with dropout voltages of less than 1.15 V. The maximum quiescent current is only 10 mA at full load. Device protection includes over-current and thermal shutdown. The CS5203-3 is pin compatible with the LT1085 family of linear regulators. The regulator is available in a surface mount D2PAK-3 package. Features * Output Current to 3.0 A * Output Accuracy to 1.5% Over Temperature * Dropout Voltage (typical) 1.15 V @ 3.0 A * Fast Transient Response * Fault Protection - Current Limit - Thermal Shutdown
VIN VOUT
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D2PAK-3 DP SUFFIX CASE 418AB
Tab = VOUT Pin 1. GND 2. VOUT 3. VIN
MARKING DIAGRAM
CS5203-3 AWLYWW
1 5.0 V 3.3 V @ 3.0 A A WL, L YY, Y WW, W = Assembly Location = Wafer Lot = Year = Work Week
CS5203-3 GND
100 mF 5.0 V
10 mF 5.0 V
ORDERING INFORMATION
See detailed ordering and shipping information in the package dimensions section on page 5 of this data sheet.
Figure 1. Application Diagram
(c) Semiconductor Components Industries, LLC, 2006
September, 2006 - Rev. 7
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Publication Order Number: CS5203-3/D
CS5203-3
MAXIMUM RATINGS*
Parameter Supply Voltage, VIN Operating Temperature Range Junction Temperature Storage Temperature Range Lead Temperature Soldering: ESD Damage Threshold (Human Body Model) 1. 60 second maximum above 183C *The maximum package power dissipation must be observed. Reflow (SMD styles only) Note 1 Value 7.0 -40 to +70 150 -60 to +150 230 Peak 2.0 Unit V C C C C kV
ELECTRICAL CHARACTERISTICS (CIN = 10 mF, COUT = 22 mF Tantalum, VOUT + VDROPOUT < VIN < 7.0 V, 0C TA 70C, TJ +150C, unless otherwise specified, Ifull load = 3.0 A)
Characteristic Fixed Output Voltage Output Voltage (Notes 2 and 3) Line Regulation Load Regulation (Notes 2 and 3) Dropout Voltage (Note 4) Current Limit Quiescent Current Thermal Regulation (Note 5) Ripple Rejection (Note 5) Thermal Shutdown (Note 6) Thermal Shutdown Hysteresis (Note 6) VIN - VOUT = 1.5 V; 0 IOUT 3.0 A 2.0 V VIN - VOUT 3.7 V; IOUT = 10 mA VIN - VOUT = 2.0 V; 10 mA IOUT 3.0 A IOUT = 3.0 A VIN - VOUT = 3.0 V IOUT = 10 mA 30 ms Pulse, TA = 25C f = 120 Hz; IOUT = 3.0 A; VIN - VOUT = 3.0 V; VRIPPLE = 1.0 VPP - - 3.250 (-1.5%) - - - 3.1 - - - 150 - 3.300 0.02 0.04 1.15 4.6 6.0 0.002 80 180 25 3.350 (+1.5%) 0.20 0.4 1.4 - 10 0.020 - 210 - V % % V A mA %/W dB C C Test Conditions Min Typ Max Unit
2. Load regulation and output voltage are measured at a constant junction temperature by low duty cycle pulse testing. Changes in output voltage due to temperature changes must be taken into account separately. 3. Specifications apply for an external Kelvin sense connection at a point on the output pin 1/4" from the bottom of the package. 4. Dropout voltage is a measurement of the minimum input/output differential at full load. 5. Guaranteed by design, not tested in production. 6. Thermal shutdown is 100% functionally tested in production. PACKAGE PIN DESCRIPTION Package Pin Number D2PAK-3 1 2 3 Pin Symbol GND VOUT VIN Ground connection. Regulated output voltage (case). Input voltage. Function
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CS5203-3
VIN
VOUT
Output Current Limit Thermal Shutdown Bandgap Reference GND -+ Error Amplifier
Figure 2. Block Diagram
TYPICAL PERFORMANCE CHARACTERISTICS
1.20 Reference Voltage Deviation (%) 1.15 Dropout Voltage (V) 1.10 1.05 1.00 0.95 0.90 0.85 0.80 0.75
0 0.30 0.60 0.90 1.20 1.50 1.80 2.10 2.40 2.70 3.00 TCASE = 25C TCASE = 125C TCASE = 0C
+0.3 +0.2 +0.1 0 -0.1 -0.2 -0.3
0
30
60
90
120
Output Current (A)
TJ (C)
Figure 3. Dropout Voltage vs. Output Current
0.16 Output Voltage Deviation (%) 85 75 Ripple Rejection (dB) 0.12 65 55 45 35 25
TCASE = 0C 0 1.5 3
Figure 4. Output Voltage Deviation vs. Temperature
0.08
TCASE = 25C
0.04
TCASE = 125C
IOUT = 1.0 A (VIN - VOUT) = 3.0 V VRIPPLE = 1.0 VPP
TCASE = 25C
0.00
15
101
102
103
104
105
106
Output Current (A)
Frequency (Hz)
Figure 5. Load Regulation vs. Output Current
Figure 6. Ripple Rejection vs. Frequency
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CS5203-3
6 DVOUT (mV) +200 0 -200
VIN = 5.0 V
5 4 ISC (A) VOUT = 3.3 V CIN = 100 mF COUT = 10 mF Tantalum 3 2 1 0
3 I (A) 2 1 0
0
5
10
1.0
1.5
2.0
2.5
3.0
3.5
Time (ms)
VIN - VOUT (V)
Figure 7. Transient Response
Figure 8. Short Circuit Current vs. VIN - VOUT
APPLICATIONS INFORMATION The CS5203-3 linear regulator provides a fixed 3.3 V output voltage at currents up to 3.0 A. The regulator is protected against overcurrent conditions and includes thermal shutdown. The CS5203-3 has a composite PNP-NPN output transistor and requires an output capacitor for stability.
Stability Considerations
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.
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 mF tantalum capacitor will work for most applications, but with high current regulators such as the CS5203-3 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 CS5203-3 linear 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 9 is recommended.
IN4002 (Optional) VIN C1 VOUT
VIN
VOUT
CS5203-3 GND
C2
Figure 9. Protection Diode Scheme for Large Output Capacitors
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CS5203-3
Output Voltage Sensing
Since the CS5203-3 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. For best results the regulator should be connected as shown in Figure 10.
RC Conductor Parasitic Resistance
The maximum power dissipation for a regulator is:
PD(max) + {VIN(max) * VOUT(min)}IOUT(max) ) VIN(max)IQ (2)
VIN
VIN
VOUT CS5203-3
RLOAD
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). 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 RqJA, the total thermal resistance between the junction and the surrounding air. 1. Thermal Resistance of the junction to case, RqJC (C/W) 2. Thermal Resistance of the case to Heat Sink, RqCS (C/W) 3. Thermal Resistance of the Heat Sink to the ambient air, RqSA (C/W) These are connected by the equation:
RQJA + RQJC ) RQCS ) RQSA
(3)
Figure 10. Conductor Parasitic Resistance Effects Can Be Minimized With the Above Grounding Scheme For Fixed Output Regulators Calculating Power Dissipation and Heat Sink Requirements
The CS5203-3 linear regulator includes thermal shutdown and current limit 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 CS5203-3, 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 RqJA (C/W) These four are related by the equation
TJ + TA ) PD RQJA
(1)
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 value for RqJA is calculated using equation (3) and the result can be substituted in equation (1). The value for RqJC is 3.5C/W for a given package type based on an average die size. For a high current regulator such as the CS5203-3 the majority of the heat is generated in the power transistor section. The value for RqSA depends on the heat sink type, while RqCS 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 RqJA 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.
ORDERING INFORMATION Orderable Part Number CS5203-3GDP3 CS5203-3GDPR3 Type* 3.0 A, 3.3 V Output 3.0 A, 3.3 V Output Package D2PAK-3 D2PAK-3 Shipping 50 Units / Rail 750 / Tape & Reel
*Consult your local sales representative for other package options. 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.
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CS5203-3
PACKAGE DIMENSIONS
D2PAK-3 DP SUFFIX CASE 418AB-01 ISSUE O
For D2PAK Outline and Dimensions - Contact Factory
PACKAGE THERMAL DATA Parameter RqJC RqJA Typical Typical D2PAK-3 3.5 10-50* Unit C/W C/W
* Depending on thermal properties of substrate. RqJA = RqJC + RqCA
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.
PUBLICATION ORDERING INFORMATION
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CS5203-3/D

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