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| www.fairchildsemi.com FAN1538 Dual Channel 1A Low Dropout Linear Regulator with UVLO and Soft-start Features * * * * * * Two independent outputs Load regulation: 0.05% typical Under-voltage lockout and softstart Over Temperature protection T0-252 DPAK, 5-lead SPAK packages Fixed 3.3V and adjustable or fixed 2.5V output General Description The FAN1538 provides two output voltages: a fixed 3.3V ouput and either a fixed 2.5V or adjustable output with 1A output current capability. Refer to Ordering Information for details. Current limit protects against short circuit currents and on chip over temperature circuitry limits the maximum die temperature. Under voltage lockout and softstart circuitry protects against unregulated output voltages when the input voltage is below specification. Applications * * * * Hard Disk Drives, CD-Roms Set-top Boxes ADSL line cards Motherboards with multiple supplies Block Diagram FAN1538A V1 VIN = 5V + 22F NC GND VIN V2 + 22F + 22F 2.5V at 1.0A 3.3V at 1.0A FAN1538B V1 VIN = 5V 22 F GND FB V2 R1 250 22F R2 1250 1.5V at 1.0A 22F 3.3V at 1.0A V2 = VREF (1 + R1/R2) REV. 1.0.2 12/17/03 FAN1538 PRODUCT SPECIFICATION Pin Assignments FAN1538PA FRONT VIEW FAN1538PB FRONT VIEW FAN1538DA FRONT VIEW FAN1538DB FRONT VIEW 1 123 45 123 45 2 3 4 5 1 2 3 4 5 V1 V1 V1 FB GND GND NC GND GND V2 V2 V2 V2 NC VIN VIN VIN VIN 5-Lead SPAK JC=2C/W 5-Lead SPAK JC=2C/W 5-Lead Plastic TO-252 DPAK JC=3C/W Tab is GND Pin Descriptions Pin Name VIN NC/FB V1 V2 GND SPAK DPAK 1 2 4/5 5/4 3 Pin Function Input supply voltage For V2 fixed, no connect. For V2 adjustable, feedback voltage. Output #1 Output #2 Ground Absolute Maximum Ratings Parameter VIN Storage Temperature Range Lead Soldering Temperature, 10 seconds Min. -65 Max. 10 150 300 Units V C C Recommended Operating Conditions Parameter VIN Ambient Operating Temperature (TA) Conditions Vin to GND Min. 4.75 0 Typ. 5 Max. 5.25 125 Units V C 2 FB V1 REV. 1.0.2 12/17/03 PRODUCT SPECIFICATION FAN1538 Electrical Specifications (Operating Conditions: VIN = 5V, TJ=25C unless otherwise specified) The * denotes specifications which apply over the full operating temperature range. Parameter V1 Output Voltage V2 Output Voltage (FAN1538A) V2 Minimum Output Voltage (FAN1538B) Reference Voltage (FAN1538B) (FB) FB Pin Bias Current Line Regulation (Both Outputs) Load Regulation (Both Outputs) Current Limit (Both Outputs) Minimum Load Current (Both Outputs) Quiescent Current Ripple Rejection (Both Outputs) VIN Rising threshold VIN Falling threshold V1 & V2 delay start time V1 softstart slew rate V2 softstart slew rate V1 & V2 Thermal Shutdown Shut down Temperature Thermal hysteresis 165 40 C C R1 = 1250 & R2 = 250 ohms VIN < 3.4 * VIN > UVLO Rising Threshold 4.50V VIN 7V Iout = 10mA VIN=5.0V 10mA Iout 1A VIN = 5V 4.50V VIN 7V VIN = 5V F = 60Hz, Cout = 22F VIN = 5V, Iout =100mA * * * * 60 Conditions 10mA Iout 1A 4.50V VIN 7V 10mA Iout 1A 4.50V VIN 7V 10mA Iout 1A 4.50V VIN 7V 10mA Under-Voltage Lockout (See Diagram1) 3.4 3.0 3.8 3.3 150 250 550 0.5 4.2 3.6 V V s s/V s/V V VIN VIN = 3.8V V3.3 Input Voltage V1.5 VIN = 3.3V 150s Time Diagram 1: UVLO and Softstart Timing REV. 1.0.2 12/17/03 3 PRODUCT SPECIFICATION FAN1538 Mechanical Dimensions TO-252 DPAK Package A 6.80 6.35 5.64 5.04 6.00 MIN 1.27 0.50 6.56 MIN 6.30 5.90 1.02 0.60 6.25 3.00 MIN C 1 (0.44) 0.570.07 0.25 M A M C 1.27 LAND PATTERN RECOMMENDATION 5.08 B 2.40 2.18 (5.09) 0.60 0.40 2 3 4 5 1.27 0.690.15 1 1.27 1.00 3.81 (4.05) 10.42 9.20 SEE DETAIL A 3 5 4 2 1 0.10 B GAGE PLANE 0.60 0.40 0.51 (1.54) NOTES: UNLESS OTHERWISE SPECIFIED A) ALL DIMENSIONS ARE IN MILLIMETERS. B) THIS PACKAGE CONFORMS TO JEDEC, TO-252, ISSUE C, VARIATION AA, DATED NOV. 1999. 0.13 MAX SEATING PLANE 10 0 1.78 1.40 (2.90) DETAIL A (ROTATED 90) SCALE: 2X REV. 1.0.2 12/17/03 4 PRODUCT SPECIFICATION FAN1538 Mechanical Dimensions (continued) 5-Lead SPAK Notes: 1. All linear dimensions are in inches (millimeters). 2. This drawing is subject to change without notice. 3. The center lead is in electrical contact with the thermal tab. 4. Dimensions do not include mold protrusions, not to exceed 0.006 (0,15). Symbol A B b1 b2 C c1 c2 D E e L L1 L2 L3 R Inches Min. Max. Millimeters Min. Max. Notes 0.350 0.360 0.220 NOM 0.268 0.025 0.031 0.080 0.070 0.040 0.050 0.010 NOM 0.295 NOM 0.365 0.375 0.067 0.410 0.031 0.350 0.420 0.041 0.360 8.89 9.14 5.59 NOM 6.81 0.63 0.79 2.03 1.78 1.02 1.27 0.25 NOM 7.49 NOM 9.27 9.52 1.72 10.41 0.79 8.89 10.67 1.04 9.14 0.310 0.320 0.010 NOM 0 8 7.87 8.13 0.25 NOM 0 8 E A B C c1 c2 D L L3 L2 Thermal Ta b (See Note 3) 1 e b1 5 b2 0.010 (0,25) M Seating Plane 0.004 (0,10) 0.005 (0.13) 0.001 (0.03) R L1 Gage Plane 3-6 REV. 1.0.2 12/17/03 5 FAN1538 PRODUCT SPECIFICATION Ordering Information Part Number FAN1538DBX FAN1538PBX FAN1538DAX FAN1538PAX Voltage Option V1 = 3.3V, V2 = adj V1 = 3.3V, V2 = adj V1 = 3.3V, V2 = 2.5V V1 = 3.3V, V2 = 2.5V Package 5-Lead DPAK in Tape and Reel 5-Lead SPAK in Tape and Reel 5-Lead DPAK in Tape and Reel 5-Lead SPAK in Tape and Reel DISCLAIMER FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS. LIFE SUPPORT POLICY FAIRCHILD'S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury of the user. www.fairchildsemi.com 12/17/03 0.0m 005 Stock#DS30001538 2003 Fairchild Semiconductor Corporation 2. A critical component in any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. |
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