FAN1537 FAIRCHILD | Alldatasheet

Document overview

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Technical content

Features

  • Low dropout voltage
  • Load regulation: 0.05% typical
  • On-chip thermal limiting
  • SO-8 and 5-lead SPAK and TO-252 DPAK packages
  • Fixed 3.3V , and adjustable or 2.5V or 1.8V fixed
  • Stable with low ESR output capacitors

Applications

  • Hard Disk Drives, CD-ROMs, DVDs
  • High efficiency linear regulators
  • Post regulators for switching supplies
  • ADSL and Cable Modems
  • 5V to 3.3V and 2.5V linear regulators
  • Motherboard with multiple supplies

Description

The FAN1537 provides 2 output voltages: 3.3V , and either adjustable or 2.5V or 1.8V fixed with 1.0A each output current capability. These devices have been optimized for low voltage where transient response and minimum input voltage are critical. Current limit features protect the outputs against short circuit currents. On-chip thermal limiting provides protection against any combination of overload and ambient tempera- ture that would create excessive junction temperatures. The FAN1537 series regulators are available in SO-8 and 5-lead SPAK and TO-252 DPAK power packages. Typical Applications V2 = V REF (1 + R1/R2) 22µF 2.5V at 1.0A 3.3V at 1.0A 22µF VIN = 5V VIN NC GND V2 FAN1537A 22µF 22µF 2.5V at 1.0A 3.3V at 1.0A 22µF 22µF 3.3V at 1.0A 22µF VIN = 5V + + VIN GND FB FAN1537B 22µF 22µFR1 54.9Ω 124Ω 1.8V at 1.0A 3.3V at 1.0A 22µF FAN1537 Dual 1A Adjustable/Fixed Low Dropout Linear Regulators

FAN1537 PRODUCT SPECIFICATION REV. 1.1.1 3/20/02 Pin Assignments Pin Descriptions Absolute Maximum Ratings Pin Name SO-8 SPAK DPAK Pin Function V IN 1 1 Input supply voltage NC/FB 2 2 For V2 fixed, no connect. For V2 adjustable, feedback voltage. V1 3 4/5 Output #1 V2 4 5/4 Output #2 GND 5, 6, 7, 8 3 Ground Parameter Min. Max. Unit V IN 10 V Operating Junction Temperature Range 0 150 °C Storage Temperature Range -65 150 °C Lead Temperature (Soldering, 10 sec.) 300 °C TOP VIEW GND GND GND GND 12345 VIN NC 8-Lead Plastic SO-8 ΘJC=25°C/W FAN1537PB FRONT VIEW FB GND VIN 5-Lead SPAK ΘJC=2°C/W FAN1537PA FAN1537PC FRONT VIEW NC GND VIN NC GND VIN FB GND VIN 5-Lead SPAK ΘJC=2°C/W 12345 FRONT VIEW FAN1537DA FAN1537DC FRONT VIEW FAN1537DB 5-Lead Plastic TO-252 DPAK ΘJC=3°C/W Tab is GND 1234 5 1234 5

PRODUCT SPECIFICATION FAN1537 REV. 1.1.1 3/20/02

Electrical Characteristics

(Operating Conditions: V IN 7V, T J =25°C unless otherwise specified.) The • denotes specifications which apply over the specified operating temperature range of 0°C to 125°C junction temperature. Notes: 1. See thermal regulation specifications for changes in output voltage due to heating effects. Load and line regulation are measured at a constant junction temperature by low duty cycle pulse testing. 2. Power dissipation is determined by input/output differential and the output current. Guaranteed maximum output power will not be available over the full input/output voltage range. 3. ESR = 0.2 Ω 4. For adjust only, V OUT = V REF (1 + R1/R2) Parameter Conditions Min. Typ. Max. Units Output Voltages 10mA I OUT 4.75V V IN 1.764 1.742 2.450 2.420 3.234 3.200 1.8 1.8 2.500 2.500 3.300 3.300 1.836 1.858 2.550 2.580 3.366 3.400 V Output Voltage 3.3V Output, V IN = 4.5V, I OUT = 1A 3.2 V Time to Output Voltages Valid From V IN 4.75V 5 msec Reference Voltage, V REF 10mA I OUT 4.75V V IN 1.225 1.210 1.250 1.250 1.275 1.290 V Line Regulation 1,2 (both outputs) 4.75V V IN 7V, I OUT = 10mA 0.005 0.5 % Load Regulation 1,2 (both outputs) V IN = 4.75V, 10mA I OUT 0.05 0.5 % Dropout Voltage (3.3V output) V OUT = 1%, I OUT = 1A 1.100 1.300 V Current Limit (both outputs) V IN = 5V 1.3 1.5 A Minimum Load Current (both outputs) 4.75V V IN 10 mA Quiescent Current V IN = 7V 61 5 m A Ripple Rejection (both outputs) f = 120Hz, C OUT = 22µF Tantalum, V IN = 5V, I OUT = 1A 60 dB Long-Term Stability T A = 125°C, 1000 hrs. 0.03 1.0 % RMS Output Noise (% of V OUT A = 25°C, 10Hz f 10kHz 0.003 % Thermal Resistance, Junction to Case SO-8 50 °C/W TO-252 DPAK 3 °C/W SPAK 2 °C/W Thermal Shutdown 155 °C Thermal Shutdown Hysteresis Junction Temperature 10 °C

FAN1537 PRODUCT SPECIFICATION REV. 1.1.1 3/20/02 Application Hints External Capacitors Like any low-dropout regulator, the FAN1537 requires external capacitors for stability. Input Capacitor A Tantalum input capacitor of 22µF is recommended. This capacitor must be located at a distance of no more than 0.5" from the input pin of the device and returned to a clean ana- log ground. Output Capacitor The FAN1537 is designed to work with Ceramic or Tantalum load capacitors. A value of 22µF is recommended on each output, but the value can be reduced to 10µF to save space. Additional capacitance can be added without limit for better performance, e.g. improved transient response and lower noise. When a Ceramic multilayer capacitor is used, the X7R dielectric is recommended which holds the capacitance within ±15%. The output capacitor should be located not more than 0.5" from the output pins of the device and returned to a clean analog ground.

PRODUCT SPECIFICATION FAN1537 REV. 1.1.1 3/20/02 Mechanical Dimensions 8-Lead SOIC Package D A – C – ccc C LEAD COPLANARITY SEATING PLANEe B L h x 45° C α EH A .053 .069 1.35 1.75 Symbol Inches Min. Max. Min. Max. Millimeters Notes A1 .004 .010 0.10 0.25 .020 0.51B .013 0.33 C .0075 .010 0.20 0.25 E .150 .158 3.81 4.01 e .228 .244 5.79 6.20 .010 .020 0.25 0.50 H .050 BSC 1.27 BSC h L .016 .050 0.40 1.27 0° 8° 0° 8° N8 8 α ccc .004 0.10—— D .189 .197 4.80 5.00 Notes: Dimensioning and tolerancing per ANSI Y14.5M-1982. "D" and "E" do not include mold flash. Mold flash or protrusions shall not exceed .010 inch (0.25mm). "L" is the length of terminal for soldering to a substrate. Terminal numbers are shown for reference only. "C" dimension does not include solder finish thickness. Symbol "N" is the maximum number of terminals.

FAN1537 PRODUCT SPECIFICATION REV. 1.1.1 3/20/02 Mechanical Dimensions 5-Lead SPAK C Seating Plane 0.005 (0.13) 0.001 (0.03) R Gage Plane B A L D M0.010 (0,25) 0.004 (0,10) 3°–6° Thermal Ta b (See Note 3) E 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). A 0.3600.350 Symbol Inches Min. Max. Min. Max. Millimeters Notes B 0.220 NOM 0.268 0.070C 0.080 c1 0.0500.040 D E L 0.4200.410 0.067

0.295 NOM

0° 8° e α c2 0.010 NOM 9.148.89 0.3750.365 9.52 9.27

5.59 NOM

6.81b1 b2 0.0310.025 0.790.63 1.78 2.03 1.271.02 10.6710.41 0.0410.031 1.04 0.79 1.72

7.49 NOM

0.25 NOM

0° 8° L2 0.3600.350 9.14 8.89 L3 0.3200.310 8.13 7.87 R 0.010 NOM 0.25 NOM e

FAN1537 PRODUCT SPECIFICATION REV. 1.1.1 3/20/02 Mechanical Dimensions 5-Lead TO-252 Package (2.90) 10° 1.78 1.40 GAGE PLANE 0.60 0.40 SEATING PLANE

0.13 MAX

(1.54) 0.51 (5.09) (4.05) SEE DETAIL A 0.25 M C MCA 1.27 0.50 1.02 0.60 5.64 5.04 6.25 A 2.40 2.18 B0.10 10.42 9.20 0.60 0.40

3.00 MIN

B

6.56 MIN

6.00 MIN

1.27 5.08 5 4 6.80 6.35 6.30 5.90 3.81 1.00(0.44) 1.27 1.27 LAND PATTERN RECOMMENDATION 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. (ROTATED 90°) SCALE: 2X DETAIL A

FAN1537 PRODUCT SPECIFICATION 3/20/02 0.0m 004 Stock#DS30001537

2001 Fairchild Semiconductor Corporation

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. 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. www.fairchildsemi.com 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.

Ordering Information

Table 1. SuffixV 1 V 2 A 3.3V 2.5V B 3.3V ADJ C 3.3V 1.8V Example: FAN1537PA FAN1537 A P Table 1M = SO-8 P = SPAK D = TO-252 DPAK