Datasheet
Table Of Contents
- FEATURES
- APPLICATIONS
- DESCRIPTION
- ABSOLUTE MAXIMUM RATINGS
- RECOMMENDED OPERATING CONDITIONS
- THERMAL INFORMATION
- PACKAGE SPECIFICATIONS
- ELECTRICAL CHARACTERISTICS
- DEVICE INFORMATION
- TYPICAL CHARACTERISTICS (PVIN = VIN = 12 V) The electrical characteristic data has been developed from actual products tested at 25°C. This data is considered typical for the converter. Applies to , , and . The temperature derating curves represent the conditions at which internal components are at or below the manufacturer's maximum operating temperatures. Derating limits apply to devices soldered directly to a 100 mm × 100 mm six-layer PCB with 1 oz. copper. Applies to , , and .
- TYPICAL CHARACTERISTICS (PVIN = VIN = 5 V) The electrical characteristic data has been developed from actual products tested at 25°C. This data is considered typical for the converter. Applies to , , and . The temperature derating curves represent the conditions at which internal components are at or below the manufacturer's maximum operating temperatures. Derating limits apply to devices soldered directly to a 100 mm × 100 mm six-layer PCB with 1 oz. copper. Applies to , , and .
- APPLICATION INFORMATION
- ADJUSTING THE OUTPUT VOLTAGE
- Frequency Select
- CAPACITOR RECOMMENDATIONS FOR THE LMZ31530 POWER SUPPLY
- Transient Response
- Transient Waveforms Device configured for FCCM mode of operation, (pin 3 connected to pin 19).
- Application Schematics
- VIN and PVIN Input Voltage
- 3.3 V PVIN Operation
- Power Good (PWRGD)
- Slow Start (SS_SEL)
- Auto-Skip Eco-Mode / Forced Continuous Conduction Mode
- Power-Up Characteristics
- Pre-Biased Start-Up
- Remote Sense
- Output On/Off Inhibit (INH)
- Overcurrent Protection
- Current Limit (ILIM) Adjust
- Thermal Shutdown
- Layout Considerations
- EMI
- Revision History
INH
PGND
Q1
INH
Control
LMZ31530
SLVSBC7B –OCTOBER 2013–REVISED DECEMBER 2013
www.ti.com
Output On/Off Inhibit (INH)
The INH pin provides electrical on/off control of the device. Once the INH pin voltage exceeds the threshold
voltage, the device starts operation. If the INH pin voltage is pulled below the threshold voltage, the regulator
stops switching and enters low quiescent current state.
The INH pin has an internal pull-up current source, allowing the user to float the INH pin for enabling the device.
If an application requires controlling the INH pin, use an open drain/collector device, or a suitable logic gate to
interface with the pin.
Figure 23 shows the typical application of the inhibit function. The Inhibit control has its own internal pull-up to
VIN potential. An open-collector or open-drain device is recommended to control this input.
Turning Q1 on applies a low voltage to the inhibit control (INH) pin and disables the output of the supply, shown
in Figure 24. If Q1 is turned off, the supply executes a soft-start power-up sequence, as shown in Figure 25. The
waveforms were measured with a 12-A constant resistance load.
Figure 23. Typical Inhibit Control
Figure 24. Inhibit Turn-Off Figure 25. Inhibit Turn-On
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