ST1S14

Part 1: Markdown Summary

Part: ST1S14

Type: Step-Down Switching Regulator

Key Specs:

• DC output current: 3 A
• Operating input voltage: 5.5 V to 48 V
• Switching frequency: 850 kHz
• Quiescent current: 2 mA maximum
• Internal N-channel DMOS RDS(on): 200 mΩ typical
• Minimum output voltage: 1.22 V

Features:

• Internal soft-start
• Power good open collector output
• Current mode architecture
• Embedded compensation network
• Zero load current operation
• Internal current limiting
• Inhibit for zero current consumption
• Thermal shutdown
• Pulse-by-pulse current limit
• Current foldback

Applications:

• Factory automation
• Printers
• DC-DC modules
• High current LED drivers

Package:

• HSOP8 with exposed frame

• 3 A DC output current
• Operating input voltage from 5.5 V to 48 V
• 850 kHz internally fixed switching frequency
• Internal soft-start
• Power good open collector output
• Current mode architecture
• Embedded compensation network
• Zero load current operation
• Internal current limiting
• Inhibit for zero current consumption
• 2 mA maximum quiescent current over temperature range
• 250 mΩ typ. RDS(on)
• Thermal shutdown

• Factory automation
• Printers
• DC-DC modules
• High current LED drivers

Description

The ST1S14 is a step-down monolithic power switching regulator able to deliver up to 3 A DC current to the load depending on the application conditions. The high current level is also achieved thanks to a HSOP8 package with exposed frame, that allows to reduce the Rth(JA) down to approximately 40 °C/W. The output voltage can be set from 1.22 V. The device uses an internal Nchannel DMOS transistor (with a typical RDS(on) of 200 mΩ) as the switching element to minimize the size of the external components. The internal oscillator fixes the switching frequency at 850 kHz. Power good open collector output validates the regulated output voltage as soon as it reaches the regulation. Pulse-by-pulse current limit offers an effective constant current short-circuit protection. Current foldback decreases overstress in a persistent short-circuit condition.

Contents ST1S14

Table 1. Pin description

All the population tested at T^J = 25 °C, VCC =12 V, VEN1 = 0 V, VEN2 = VCC unless otherwise specified.

The specification is guaranteed from (-40 to +125 °C) T^J temperature range by design, characterization, and statistical correlation.

Table 6. Electrical characteristics

Table 6. Electrical characteristics (continued)

^1. Parameter guaranteed by design

Function description ST1S14

Table 3. Absolute maximum ratings

Table 4. Thermal data