H1084U HSMC | Alldatasheet

Document overview

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Technical content

Features

  • Low Dropout Voltage 1.2V at 5A
  • Adjustable or Fixed Voltage.
  • Line Regulation Typically 0.015%.
  • Load Regulation Typically 0.05%.
  • Adjust Pin Current Less Than 90 uA.
  • Over Current Protection.
  • Thermal Protection.

Applications

  • High Efficiency Linear Regulators.
  • Post Regulators For Switching Supplies.
  • 5V to 3.3V Voltage Converter.
  • Battery Charger. General Description The H1084U is a 5A low-dropout positive voltage regulator. It is available in fixed and adjustable output voltage versions. Over Current and thermal protection are integrated onto the chip. Output current will decrease while it reaches the pre-set current or temperature limit. The dropout voltage is specified at 1.2V Maximum at full rated output current. H1084U Series provides excellent regulation over variations due to changes in line, load and temperature. H1084U is three terminal regulator and available in popular packages. Device Selection Guide Device Output Voltage Package H1084U 1.3V to 4V H1084-3.3U 3.3 TO-263 Absolute Maximum Ratings Parameter Symbol Maximum Units Input Voltage V IN 7V Power Dissipation P D Internally Limited W Thermal Resistance Junction To Case TO-263 θJC 3 °C/W Thermal Resistance Junction To Ambient TO-263 θJA 50 °C/W Operating Junction Temperature Range T j 0 To 125 °C Storage Temperature Range T STG -65 To 150 °C Lead Temperature (Soldering) 10 Sec T LEAD 260 °C Typical Application H1084-3.3U 10uF TAN 10uF TAN 4.75V to 5.25V DC GND Load

MICROELECTRONICS CORP. Spec. No. : Preliminary Data Issued Date : 1998.06.01 Revised Date : 1999.08.01 Page No. : 2/5 HSMC Product Specification Block Diagram

Electrical Characteristics

H1084U (adj version) Parameter Symbol Test Conditions Min Typ Max Units VIN=5V, IO=10mA, Tj=25°C 1.238 1.250 1.262Reference Voltage Adj Voltage VREF VIN=5V, IO=10mA, Over Temp. 1.225 1.250 1.275 V -1-Dropout Voltage ∆VOUT, ∆ VREF=1% VD VIN=2.75~7V, IO=10mA~5A -1 1 . 2 V Current Limit I S VIN=2.75~7V, Over Temp. 5 - - A Temperature Coeff. T C VIN=2.75~7V, IO=10mA~5A - 0.005 - %/°C VIN=2.75~7V, IO=10mA~5A,Tj=25°C -5 5-Adjust Pin Current I adj VIN=2.75~7V, IO=10mA~5A, Over Temp. - - 90 Adjust Pin Current Change ∆Iadj VIN=2.75~7V, IO=10mA~5A, Over Temp. - 0.2 5 uA Temperature Stability T S VIN=5V, IO=500mA, Over Temp. - 0.5 - % Minimum Load Current I O VIN=5V - 5 10 mA RMS Output Noise V N Tj=25°C -0 . 0 0 3-% V O Ripple Rejection Ratio R A VIN=5V, IO=5A, Over Temp. 60 72 - dB H1084-3.3U Parameter Symbol Test Conditions Min Typ Max Units VIN=5V, IO=0A,Tj=25°C 3.267 3.3 3.333Output Voltage Fixed Voltage VO VIN=5V, IO=0A, Over Temp. 3.234 3.3 3.366 V VIN=4.5~7V, IO=0A~5A, Tj=25°C -1-Dropout Voltage ∆VOUT, ∆ VREF=1% VD VIN=4.5~7V, IO=0A~5A, Over Temp. - 1 1.2 V Current Limit I S VIN=4.5~7V, Over Temp. 5 7.5 - A Quiescent Current Fixed Model IQ VIN=5V, IO=0A~5A,Over Temp. - 12 13 mA Temperature Coeff. T C VIN=4.5~7V, IO=0A~5A - 0.005 - %/°C Temperature Stability T S VIN=5V, IO=500mA, Over Temp. - 0.5 - % RMS Output Noise V N Tj=25°C -0 . 0 0 3-% V O Ripple Rejection Ratio R A VIN=5V, IO=5A, Over Temp. - 72 - dB Current Limiting Amplifier Thermal Protection Error AMP Input Output ADJ/COM Bandcap Reference

MICROELECTRONICS CORP. Spec. No. : Preliminary Data Issued Date : 1998.06.01 Revised Date : 1999.08.01 Page No. : 3/5 HSMC Product Specification Applications Description

  • Output Voltage Adjustment Like most regulators, the H1084U regulates the output by comparing the output voltage to an internally generated reference voltage. On the adjustable version, the V REF is available externally as 1.25V between VOUT and ADJ. The voltage ratio formed by R1 and R2 should be set to conduct 10mA (minimum output load). The output voltage is given by the following equation : VOUT =VREF (1+R2/R1) + IADJ R2 On fixed versions of H1084U, the voltage divider is provided internally.
  • Thermal Protection H1084U has thermal protection which limits junction temperature to 150°C. However, device functionality is only guaranteed to a maximum junction temperature of +125°C. The power dissipation and junction temperature for H1084U in TO-263 package given by PD=(VIN - VOUT) IOUT, TJUNCTION=TAMBIENT+(PDxθJA), Note : TJUNCTION must not exceed 125°C
  • Current Limit Protection H1084U is protected against overload conditions. Current protection is triggered at typically 7.5A.
  • Stability And Load Regulation H1084U requires a capacitor from VOUT to GND to provide compensation feedback to the internal gain stage. This is to ensure stability at the output terminal. Typically, a 10uF tantalum or 50uF aluminum electrolytic is sufficient. Note : It is important that the ESR for this capacitor does not exceed 0.5Ω . The output capacitor does not have a theoretical upper limit and increasing its value will increase stability. C OUT = 100 uF or more is typical for high current regulator design. H1084U load regulation is limited by the resistance of the wire connecting it to the load(RP). For the adjustable version, the best load regulation is accomplished when the top of the resistor divider(R 1) is connected directly to the output pin of the H1084U. When so connected, RP is not multiplied by the divider ratio. For fixed output versions, the top of R 1 is internally connected to the output and ground pin can be connected to low side of the load as a negative side sense if, so desired.
  • Thermal Consideration The H1084U series contain thermal limiting circuitry designed to protect itself for over-temperature conditions. Even for normal load conditions, maximum junction temperature ratings must not be exceeded. As mention in thermal protection section, we need to consider all sources of thermal resistance between junction and ambient. It contains junction-to-case, case-to-heat-sink interface and heat sink resistance itself. An additional heat sink is applied externally sometimes. It can increase the maximum power dissipation. For example, the equivalent junction temperature of 1A output current is 115°C without external heat sink. Under the same junction temperature IC can operates 3A with an adequate heat sink. Therefore, to attach an extra heat sink is recommended. Junction-to-case thermal resistance is specified from the IC junction to the bottom of the case directly below the die. The bonding wires are appending paths. The former is the lowest resistance path. Proper mounting is required to ensure the best possible thermal flow this area of the package to the heat sink. Thermal compound at the case-to-heat-sink interface is strongly recommended. The case of all devices in this series is electrically connected to the output. Therefore, if the case of the device must be electrically isolated, a thermally conductive spacer can be used, as long its thermal resistance is considered. RL Connect R1 to Case Connect R2 to Load OutIn Adj R P Parasitic Line Resistance V IN VOUT =VREF (1+R2/R1) + IADJ R2 VIN V REF In Out ADJ IADJ 10uA VOUT

MICROELECTRONICS CORP. Spec. No. : Preliminary Data Issued Date : 1998.06.01 Revised Date : 1999.08.01 Page No. : 4/5 HSMC Product Specification

  • Protection Diode (The figure is shown as Regulator with Reverse Diode Protection in advanced applications) In general operation, H1084U does not need any protection diodes. From the cross-section structure of H1084U, the output pin is connected to P+ substrate, and the input pin is connected to N- well. There is a parasitic reverse diode between them. It can handle microsecond surge currents of 50A to 100A. Even with large output capacitance, it is very difficult to get those values of surge currents in normal operation. Only with high value output capacitors, such as 1000uF. And with the input pin instantaneously shorted to ground. can damage occur. A crowbar circuit at the input of the H1084U can generate those kinds of currents, and a diode from output to input is recommended. Normal power supply cycling or even plugging and unplugging in the system will not generate currents large enough to do any damage.
  • Advanced Applications 10uF 100uF GND GND GND Vin Vo *Please refer to "protection diode section" for detailed description. Regulator with Reverse Diode Protection 10uF 10uF10uF Zener Diode or Voltage Reference GND GND GND *Vo = Vref ( 1+R2/R1 ) + Iadj x R2 **Optional for improved ripple rejection. Regulator with Reference V in V O *20m ohm *20m ohm 10uF10uF Vin Vo GND GND GND GND Paralleling Regulators *20m ohm is ballast resistance.. The inter - connection of #18 wire could act as ballast resistance. 10uF10uF 10uF Vin=7V Vo=1.5~3.45 GND GND GND Adjustable Output Voltage H 1084U H 1084U H 1084U H 1084U H 1084U

MICROELECTRONICS CORP. Spec. No. : Preliminary Data Issued Date : 1998.06.01 Revised Date : 1999.08.01 Page No. : 5/5 HSMC Product Specification TO-263 Dimension *:Typical E 0.1600 0.1900 4.06 4.83 α1 -- 6° 8° F 0.0450 0.0550 1.14 1.40 α2 -- 6° 8° G 0.0900 0.1100 2.29 2.79 α3 -- 0° 5° H 0.0180 0.0290 0.46 0.74 Notes : 1.Dimension and tolerance based on our Spec. dated Jan. 09,1998. 2.Controlling dimension : millimeters. 3.Maximum lead thickness includes lead finish thickness, and minimum lead thickness is the minimum thickness of base material. 4.If there is any question with packing specification or packing method, please contact your local HSMC sales office. Material :

  • Lead : 42 Alloy ; solder plating
  • Mold Compound : Epoxy resin family, flammability solid burning class:UL94V-0 Important Notice:
  • All rights are reserved. Reproduction in whole or in part is prohibited without the prior written approval of HSMC.
  • HSMC reserves the right to make changes to its products without notice.
  • HSMC semiconductor products are not warranted to be suitable for use in Life-Support Applications, or systems.
  • HSMC assumes no liability for any consequence of customer product design, infringement of patents, or application assistance. Head Office And Factory : Tel : 886-2-25212056 Fax : 886-2-25632712, 25368454 Tel : 886-3-5983621~5 Fax : 886-3-5982931 Tel : 886-3-5977061 Fax : 886-3-5979220 A B C D 123 KLJ G H F E 2 α 1 α 2 α 3 I Style : Pin 1.Ground/ADJ 2.Vout 3.Vin 3-Lead TO-263 Plastic Surface Mounted Package Marking : HSMC Logo Part Number Date Code Product Series Rank