CS5207-2 CHERRY

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Technical content

Features

to ±2% n Dropout Voltage 1.45V @ 7A n Fast Transient Response n Fault Protection Circuitry Thermal Shutdown Overcurrent Protection Safe Area Protection Package Options 3L TO-220 Tab (VOUT) CS5207-2 7A, 1.5V Fixed Linear Regulator CS5207-2 The CS5207-2 provides 7A at 1.5V with an accuracy of ± 2%. The regulator is intended for use as an active termination for the GTL bus on Intel based motherboards. The fast loop response and low dropout voltage make these regula- tors 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 1V depending on the output current level. The maximum quiescent cur- rent is only 10mA at full load. The regulators are fully protected against overload conditions with protection circuitry for Safe Operating Area (SOA), overcurrent and thermal shutdown. The CS5207-2 is available in TO-220 packages. Block Diagram

1 Gnd

2V OUT (Tab) 3V IN

Description

Lead Temperature Soldering A Company ¨ Rev. 6/12/98 Cherry Semiconductor Corporation

2000 South County Trail, East Greenwich, RI 02818

Tel: (401)885-3600 Fax: (401)885-5786 Email: info@cherry-semi.com Web Site: www.cherry-semi.com

Typical Performance Characteristics Dropout Voltage vs. Output Current Output Voltage vs. Temperature Electrical Characteristics: CIN = 10µF, COUT = 22µF Tantalum, VIN Ð VOUT=3V, VIN ² 10V, 0¡C ² TA ² 70¡C, TJ ² +150¡C, unless otherwise specified, Ifull load = 7A. PARAMETER TEST CONDITIONS MIN TYP MAX UNIT Package Pin Description PACKAGE PIN # PIN SYMBOL FUNCTION n Fixed Output Voltage CS5207-2 V IN Ð VOUT = 1.65V; 1.47 1.50 1.53 V (Notes 1 and 2) 0² I OU T ² 7A (-2%) (+2%) Line Regulation 1.65V ² V INÐVOUT ² 6V; IOUT = 10mA 0.04 0.20 % Load Regulation (Notes 1 and 2) V IN Ð VOUT = 1.65V; 10mA ² IOUT ² 7A 0.08 0.40 % Dropout Voltage (Note 3) I OUT = 7A 1.42 1.65 V Current Limit V IN Ð VOUT = 3V; TJ ³ 25¡C 7.1 8.5 A VIN Ð VOUT = 12V 1.0 A Quiescent Current V IN ² 9V; IOUT = 10mA 5.0 10.0 mA Thermal Regulation 30ms pulse; T A = 25¡C 0.003 %/W Ripple Rejection f = 120Hz; I OUT = 7A 80 dB Temperature Stability 0.5 % RMS Output Noise (%V OUT) 10Hz ² f ² 10kHz 0.003 %V OUT Thermal Shutdown 150 180 ¡C Thermal Shutdown Hysteresis 25 ¡C Note 1: Load regulation and output voltage are measured at a constant junction temperature by low duty cycle pulse testing. Changes in out- put voltage due to thermal gradients or temperature changes must be taken into account separately. Note 2: Specifications apply for an external Kelvin sense connection at a point on the output pin 1/4Ó from the bottom of the package. Note 3: Dropout voltage is a measurement of the minimum input/output differential at full load. 012 34 56 Dropout Voltage (V) Output Current (A) 0.85 0.70 0.80 0.90 0.95 1.00 1.05 1.10 1.15 1.20 1.25 1.30 1.35 TCASE = 0°C TCASE = 125°C 0.75 1.40 1.45 1.50 1.55 TCASE = 25°C 0 10 130 -0.12 0.10 Output Voltage Deviation (%) TJ (°C) 20 30 40 50 60 70 80 90 100 110 120 0.08 0.06 0.04 0.02 0.00 -0.02 -0.04 -0.06 -0.08 -0.10 3L TO-220 1 Gnd Ground connection. OUT Regulated output voltage (case). 3V IN Input voltage.

as the input-output differential voltage increases. Stability Considerations section. delay, load transient response and loop stability. capacitor must supply the instantaneous load current. should be as close as possible to the load for the best results. capacitor will discharge into the output of the regulator. as shown in Figure 1 is recommended. Figure 1. Protection diode scheme for fixed output regulators.

ulators should be connected as shown in Figure 2. Figure 2. Conductor parasitic resistance effects can be minimized with the above grounding scheme for fixed output regulators.

  1. Maximum Ambient Temperature T
  2. Power dissipation PD (Watts)
  3. Maximum junction temperature TJ (¡C)
  4. Thermal resistance junction to ambient RQJA (C/W)

on the manufacturer and the package type. IQ is the maximum quiescent current at IOUT(max). 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,

result can be substituted in equation (1). QJA can be calculated and the proper heat sink selected.

Part Number Type Description CS5207-2GT3 7A, 1.5V output 3 L TO-220 Straight

Ordering Information

Rev. 6/12/98 Package Specification PACKAGE DIMENSIONS IN mm(INCHES) Thermal Data TO-220 RQJC typ 1.6 ûC/W RQJA typ 50 ûC/W PACKAGE THERMAL DATA Cherry Semiconductor Corporation reserves the right to make changes to the specifications without notice. Please contact Cherry Semiconductor Corporation for the latest available information. © 1999 Cherry Semiconductor Corporation

3 Lead TO-220 (T) Straight

5.33 (.210) 4.83 (.190) 2.79 (.110) 2.29 (.090) 1.02 (.040) 0.63 (.025) 0.56 (.022) 0.38 (.014) 1.40 (.055) 1.14 (.045) 4.83 (.190) 4.06 (.160) 6.17 (.243) REF 1.14 (.045) 1.52 (.060) 1.14 (.045) 1.40 (.055) 2.87 (.113) 5.94 (.234) 14.22 (.560) 13.72 (.540) 2.92 (.115) 2.29 (.090) 9.78 (.385) 10.54 (.415) 3.71 (.146) 3.96 (.156) 14.99 (.590) 14.22 (.560) CS5207-2