Custom Meta Tags - Dynamic

Hero Banner

New Product Introduction

NPI Body

STMicroelectronics L5988D

4 A continuous (more than 5 A pulsed) step-down switching regulator with synchronous rectification

The L5988D is a monolithic step down power switching regulator able to deliver a continuous output current of 4 A to the load in most of the application conditions limited only by the thermal performance. The device is able to deliver more than 5 A to the load for a maximum time which is dependent on the thermal impedance of the system and the specific operating conditions).

The input voltage can range from 2.9 V to 18 V. The device is capable of 100% duty cycle operation thanks to the embedded high side PMOS switch which doesn’t need external bootstrap capacitor to be driven.

The internal switching frequency is adjustable by external resistor and can be set continuously from 100 kHz to 1 MHz. The L5988D can also be synchronized to an external frequency signal driven to the SYNCH pin I/O pin.

The multifunction UOS pin allows to set-up properly the additional embedded features depending on the value of the voltage level.

U (UVLO): two UVLO thresholds can be selected to match the 3.3 V and 5 V or 12 V input buses

O (OVP): latched or not latched OVP protection selectable. In latched mode the switching activity is interrupted until an UVLO or INH event happens

S (SINK): the sink capability is always disabled during soft-start time to support pre-biased output voltage. Afterwards the sink capability can be enabled or not depending on the voltage set on the multifunction pin.

During soft-start phase a constant current protection is active to deliver extra current necessary to load the output capacitor. The current limit protection is achieved by sensing the current flowing in both embedded switches to assure an effective protection even at extreme duty cycle operations. Finished the soft-start phase the current protection feature triggers the “HICCUP” mode forcing the soft-start capacitor to be discharged and recharged. The current thresholds of both switches can be adjusted in tracking by using an external resistor to dimension the current protection accordingly to the local application.

The soft-start time is based on a constant current charge of an external capacitor. As a consequence the time can be set accordingly to the value of the output capacitor.

The latest smart power technology BCD6 (Bipolar-CMOS-DMOS version 6) features a low resistance of the embedded switches (35 mΩ typical for a NMOS, 50 mΩ typical for a PMOS), achieving high efficiency levels.

The HTSSOP16 package with exposed pad accomplishes low RthJA (40 °C/W), useful in dissipating power internally generated during high output current / high frequency operations.

Features

4 A output current (more than 5 pulsed)
Operating input voltage from 2.9 V to 18 V
External 1.8 V ± 2% reference voltage
Output voltage from 0.6 to input voltage
MLCC compatible
200 ns TON
Programmable UVLO matches 3.3 V, 5 V and 12 V bus
FSW programmable up to 1 MHz
Voltage feed forward
Zero load current operation
Programmable current limit on both switches
Programmable sink current capability
Pre-bias start up capability
Thermal shutdown

STSW-eDSim - fast and powerful electrical simulation software for SMPS and analog ICs

eDSim is a fast and powerful electrical simulation tool for SMPS and analog ICs, integrated in the eDesignSuite tool. It features enhanced accuracy and higher convergence speed for SMPS, enabling a simulation time 10-50x faster than the classical analog SPICE simulators.

The tool is a specific version of the SIMPLIS/SIMetrix simulation environment paired with ST model components, for a full electrical simulation with no limitation of nodes and circuit size.

Design your analog circuit using the eDesignSuite engine, display a preview of it in few seconds with full annotated schematic and BOM, and then run the electrical simulation through eDSim to get fast and accurate simulations and reliable design validation, thus reducing the effort and risks related to hardware prototyping.

With the eDSim tool you can also create your schematic from scratch using ST models or simulate your SMPS and analog ICs from a list of predefined ST application schematics - test benches, that you can partially modify according to your needs.

Software release 2024.12 is now available.