L6933H12 STMICROELECTRONICS | Alldatasheet

Document overview

  • Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
  • PDF pages: 12

Technical content

Datasheet sections

  • 1 Pin settings
  • 1.1 Pin connection
  • 1.2 Pin description
  • 2 Maximum ratings
  • 2.1 Absolute maximum ratings
  • 2.2 Thermal data
  • 3 Block diagram
  • 4 Electrical characteristics
  • 5 Typical electrical performance
  • 6 Soft-Start
  • 7 Application information
  • 7.1 Application circuit
  • 7.2 Demoboard layout
  • 7.3 Component part list
  • 8 Components selection
  • 8.1 Input capacitor
  • 8.2 Output capacitor
  • 9 Package mechanical data
  • 10 Revision history

Features

■ 2 V to 14 V input voltage range ■ 200 mΩ rDS(on) max ■ 200 µA quiescent current at any load ■ Excellent load and line regulation ■ Adjustable from 1.2 V to 5 V ■ 1 % voltage regulation accuracy ■ Power Good output ■ MLCC capacitors filter supported ■ Adjustable Soft Start ■ Short circuit protection ■ Thermal shut down ■ HSOP8 package

Applications

■ Motherboards, mobile PC ■ Hand-held instruments ■ PCMCIA Cards ■ Processors I/O ■ Chipset and RAM supply

Description

The L6933H1.2 ultra low drop output linear regulator operates from 2 V to 14 V and is able to support output current up to 2 A. Designed with an internal 50 mΩ N-channel MOSFET, it can be used for on board DC-DC conversions saving in real estate, list of components, low noise generation and power dissipation. L6933H1.2 is available as adjustable version from 1.2 V to 5 V with a voltage regulation accuracy of 1 %. A Soft Start function allows the device to smoothly increase the Output Voltage at the start-up, avoiding overshoot. Inhibit function is provided. The upper current limit is fixed at 2.5 A to control the current in short circuit condition within ± 8 %. The current is sensed in the power MOS in order to limit the power dissipation. The device is also provided with a thermal shut down that limits the internal temperature at 150 °C with a histeresys of 20 °C. HSOP8 Figure 1. Typical operating circuit Table 1. Device summary

1 Pin settings

1.1 Pin connection

Figure 2. Pin connection (top view)

1.2 Pin description

Table 2. Pin description the capacitor. In steady state regulation, the voltage at this pin will be about 8 V. than the 0.5 V, the device is disabled. VIN 2 Supply voltage. This pin is connected to the drain of the internal N-mos. Connect this pin to a capacitor larger than 10 µF . voltage between 1.2 V and 5 V. mos. Connect this pin to a capacitor of 10 µF . forced low if the output voltage is lower than 90 % the programmed voltage.

2 Maximum ratings

2.1 Absolute maximum ratings

2.2 Thermal data

3 Block diagram

Figure 3. Block diagram Table 3. Absolute maximum ratings Table 4. Thermal data

4 Electrical characteristics

Table 5. Electrical characteristics (TJ = 25 °C, VIN = 5 V unless otherwise specified) (1)

  1. Specification referred to T from -25 °C to 125 °C.

5 Typical electrical performance

6 Soft-Start

SS capacitor increases until it reaches about 8 V. If VIN is below the turn-on threshold, the SS pin is kept shorted to GND. switch: when the voltage at this pin is lower than 0.5 V, the device is disabled. Figure 4. Output voltage vs Figure 5. Quiescent current vs

7 Application information

7.1 Application circuit

Figure 6. Demoboard application circuit

7.2 Demoboard layout

Figure 7. Demoboard layout Note: SS/INH drives directly the NPN base; its current need to be properly limited.

7.3 Component part list

Figure 8. Compensation network Table 6. Component part list Figure 8

8 Components selection

8.1 Input capacitor

47 µF is enough for any application but a much lower value can be sufficient in many cases.

8.2 Output capacitor

The output capacitor choice depends basically on the load transient requirements. applications without affecting the loop stability. Table 7. Suggested capacitor

9 Package mechanical data

conditions are also marked on the inner box label. ECOPACK is an ST trademark. ECOPACK specifications are available at: www.st.com. Table 8. SO-8 mechanical data

  1. Dimensions D does not include mold fl ash, protru-sions or gate burrs. Mold flash, potrusions or gate burrs

shall not exceed 0.15mm (.006inch) in total (both side). Figure 9. Package dimensions

Table 9. Document revision history 22-Nov-2007 3 Updated cover page.