CS5203-3 CHERRY

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Technical content

Features

3.3V @ 3A 10mF VOUT CS5203-3 VIN GND n Output Current to 3A n Output Accuracy to ±1.5% Over Temperature n Dropout Voltage (typical) 1.15V @ 3A n Fast Transient Response n Fault Protection Current Limit Thermal Shutdown Package Options CS5203-3 3A, 3.3V Fixed Linear Regulator CS5203-3 Application Diagram CS5203 -3

1 Gnd

OUT (Tab) 3V IN

Description

Tab (VOUT) Consult factory for other package options. The CS5203-3 linear regulator provides a 3.3V reference at 3A 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 impor- tant. The circuit is designed to pro- vide 3A of output current with dropout voltages of less than 1.15V . The maximum quiescent current is only 10mA at full load. Device protection includes overcurrent and thermal shut- down. The CS5203-3 is pin compatible with the LT1085 family of linear regulators. The regulator is available in a surface mount D 2 package. Rev. 6/3/98 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 A Company ¨

1 Gnd Ground connection. OUT Regulated output voltage (case). 3V IN Input voltage. CS5203-3 Package Pin Description PACKAGE PIN # PIN SYMBOL FUNCTION PARAMETER TEST CONDITIONS MIN TYP MAX UNIT Electrical Characteristics: CIN = 10µF, COUT = 22µF Tantalum, VOUT + VDROPOUT < VIN < 7V, 0¡C ² TA ² 70¡C, TJ ² +150¡C, unless otherwise specified, Ifull load = 3A. Absolute Maximum Ratings Lead Temperature Soldering n Fixed Output Voltage Output Voltage V INÐVOUT=1.5V; 3.250 3.300 3.350 V (Notes 1 and 2) 0²I OUT²3A (-1.5%) (+1.5%) Line Regulation 2V²V INÐVOUT²3.7V; IOUT=10mA 0.02 0.20 % Load Regulation V INÐVOUT=2V; 10mA²IOUT²3A 0.04 0.4 % (Notes 1 and 2) Dropout Voltage (Note 3) I OUT=3A 1.15 1.4 V Current Limit V INÐVOUT=3V 3.1 4.6 A Quiescent Current I OUT=10mA 6.0 10.0 mA Thermal Regulation (Note 4) 30ms pulse; T A=25¡C 0.002 0.020 %/W Ripple Rejection (Note 4) f=120Hz; I OUT=3A; VINÐVOUT=3V; 80 dB VRIPPLE=1VPP Thermal Shutdown (Note 5) 150 180 210 ¡C Thermal Shutdown Hysteresis 25 ¡C (Note 5) Note 1: 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. 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. Note 4: Guaranteed by design, not tested in production. Note 5: Thermal shutdown is 100% functionally tested in production.

Typical Performance Characteristics Dropout Voltage (V) Output Current (A) 0.90 0.75 0.85 0.95 1.00 1.05 1.10 1.15 1.20 0.80 TCASE = 25°C TCASE = 0°C TCASE = 125°C 03 0 -0.3 +0.3 Reference Voltage Deviation (%) TJ (°C) 60 90 120 +0.2 +0.1 -0.1 -0.2 0.04 0.000 0.08 0.12 0.16 0 1.5 3 Output Current (A) Output Voltage Deviation (%) TCASE = 0°C TCASE = 125°C TCASE = 25°C Dropout Voltage vs. Output Current Output Voltage Deviation vs Temperature Load Regulation vs. Output Current Block Diagram Error Amplifier Output Current Limit VIN VOUT Thermal Shutdown Bandgap Reference Gnd 101 Frequency (Hz) Ripple Rejection (dB) 102 103 104 105 106 TCASE = 25°C IOUT = 1A (VIN Ð VOUT) = 3V VRIPPLE = 1.0VPP Ripple Rejection vs Frequency

and requires an output capacitor for stability. delay, load transient response and loop stability. put capacitor must supply the instantaneous load current. capacitor will discharge into the output of the regulator. a diode connected as shown in Figure 1 is recommended. Figure 1. Protection diode scheme for large output capacitors. 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. ensure that an adequate heat sink is used. cal isolation may be required for some applications. rent regulators such as these.

  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.

6 © 1999 Cherry Semiconductor Corporation Cherry Semiconductor Corporation reserves the right to make changes to the specifications without notice. Please contact Cherry Semiconductor Corporation for the latest available information. Part Number Type Description CS5203-3GDP3 3A, 3.3V output 3 L D 2PAK CS5203-3GDPR3 3A, 3.3V output 3 L D 2PAK (tape & reel) CS5203-3

Ordering Information

Rev. 6/3/98 Package Specification PACKAGE DIMENSIONS IN mm(INCHES) Thermal Data D 2PAK RQJC typ 3.5 ûC/W RQJA typ 10 - 50* ûC/W *Depending on thermal properties of substrate.RQJA = RQJC + RQCA PACKAGE THERMAL DATA

3 Lead D2PAK (DP)

2.54 (.100) REF 10.31 (.406) 10.05 (.396) 8.53 (.336) 8.28 (.326) 0.91 (.036) 0.66 (.026) 1.40 (.055) 1.14 (.045) 4.57 (.180) 4.31 (.170) 1.68 (.066) 1.40 (.055) 2.74(.108) 2.49(.098) 1.40 (.055) 1.14 (.045) 0.10 (.004) 0.00 (.000) .254 (.010) REF 15.75 (.620) 14.73 (.580) 2.79 (.110) 2.29 (.090)