ST1S14PHR

List of figure

Manufacturer

STMicroelectronics

Overview

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

Features

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

Applications

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

Pin Configuration

Table 1. Pin description

N	Pin	Description
1	BOOT	Bootstrap capacitor for N-channel gate driver. Connects 100 nF low ESR capacitor from BOOT pin to SW
2	PG	Power good
3	EN1	Enable pin active low
4	FB	Feedback voltage
5	EN2	Enable pin active high
6	GND	Ground pin
7	VIN	Input supply pin
8	SW	Switching node
	E.p.	Exposed pad must be connected to GND

Electrical Characteristics

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

	Operating input
VIN	voltage range MOSFET on
RDS(on)	resistance
ISW	Maximum limiting current
tHICCUP	Hiccup time
fSW	Switching frequency
	Duty cycle
TON MIN	Minimum conduction time of the power element
TOFF MIN	Minimum conduction time of the external diode
	DC characteristics

VFB	Voltage feedback
IFB	FB biasing current

Iq	Quiescent current
Iqst-by	Standby quiescent
	current
PG	Power good threshold
	PG output voltage
	(open collector active)

Table 6. Electrical characteristics (continued)

Symbol	Parameter	Test condition		Min	Typ	Max	Unit
		Device ON VIN=5.5 V to 48 V				0.5	V
VEN1	Enable 1 levels	Device OFF VIN=5.5 V to 48 V		1.5			V
IEN1	Enable 1 biasing current	VEN1=5 V		0.7	1.6	3.5	μA
	Enable 2 levels	Device ON VIN=5.5 V to 48 V		1.5			V
VEN2		Device OFF VIN=5.5 V to 48 V				0.5	V
	Enable 2 biasing current	VEN1=0 V; VEN2=0 V		-1	-2.4	-4.5	μA
IEN2		VEN1=0 V; VEN2=12 V		2.7	5.8	10	μA
		VEN1=0 V; VCC=VEN2=48 V		3.0	6.0	10	μA
	Thermal shutdown
TSHDWN	Thermal shutdown temperature		(1)	140	150	160	°C
THYS	Thermal shutdown hysteresis		(1)		15		°C

^1. Parameter guaranteed by design

Function description ST1S14

Absolute Maximum Ratings

Table 3. Absolute maximum ratings

Symbol	Parameter	Value	Unit
VIN	Power supply input voltage	-0.3 to 52	V
VEN1	Enable 1 voltage	-0.3 to 7	V
VEN2	Enable 2 voltage	-0.3 to (VIN+0.3)	V
PG	Power good	-0.3 to (VIN+0.3)	V
BOOT	Bootstrap pin	-0.3 to 55	V
SW	Switching node	-1 to (VIN+0.3)	V
VFB	Feedback voltage	-0.3 to 3	V
TJ	Operating junction temperature range	-40 to 150	°C
TSTG	Storage temperature range	-65 to 150	°C
TLEAD	Lead temperature (soldering 10 sec.)	260	°C

Thermal Information

Table 4. Thermal data

Symbol	Parameter	Value	Unit
Rth JA	Thermal resistance junction-ambient	40	°C/W

Related Variants

The following components are covered by the same datasheet.

Part Number	Manufacturer	Package
ST1S14	STMicroelectronics	—

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