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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - DC DC Switching Regulators

STMicroelectronics ST1S14PHR

Name: ST1S14PHR
Brand: STMicroelectronics
SKU: ST1S14PHR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ST1S14PHR

Manufacturer:: STMicroelectronics

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: 8-SOIC (0.154", 3.90mm Width) Exposed Pad

Datasheet:: ST1S14PHR.pdf

Description:: IC REG BUCK ADJ 3A 8HSOP

Quantity:: RFQ Add To RFQ list

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Product details

Overview

ST1S14PHR from STMicroelectronics is a monolithic step-down switching regulator with integrated 200 mΩ N-channel DMOS power switch, delivering up to 3 A DC output current across 5.5–48 V input range, operating at fixed 850 kHz switching frequency, and featuring power-good open-collector output and internal soft-start - used in high-current industrial DC-DC modules and LED drivers.

For engineers reviewing the ST1S14PHR datasheet, ST1S14PHR pinout, ST1S14PHR application, or ST1S14PHR equivalent, key selection criteria include R_DS(on) (200 mΩ typ.), thermal resistance (40 °C/W), dual enable logic (EN1 active-low / EN2 active-high), hiccup-mode short-circuit protection, and zero-load operation capability.

Technical Context

The ST1S14PHR implements peak current mode control with an internally compensated transconductance error amplifier (218 µS, 93 dB low-frequency gain) and a fully integrated 850 kHz sawtooth oscillator. Its bootstrap circuit enables high-side N-MOS drive without external charge pump components.

It integrates pulse-by-pulse current limiting, thermal shutdown (150 ±10 °C with 15 °C hysteresis), and multi-input inhibit logic that supports both active-low (EN1) and VIN-compatible active-high (EN2) enable signals - enabling flexible system-level power sequencing and standby control.

Key Specifications

Parameter	Value and Actual Design Meaning
Output current	3 A DC continuous - supports high-power loads without external current sharing.
Input voltage range	5.5 V to 48 V - compatible with 12 V/24 V/36 V industrial bus rails and wide-range DC inputs.
Switching frequency	850 kHz (typ.) - enables compact magnetics and reduces output ripple without compromising EMI filtering size.
R_DS(on)	200 mΩ (typ.) - minimizes conduction loss and thermal rise at full load; measured at I_SW = 1 A.
Quiescent current	2 mA max over temperature - ensures low no-load power draw in always-on systems.
Power good threshold	0.92 × V_OUT (rising), 0.8 × V_OUT (falling) - provides accurate regulation validation for downstream logic sequencing.
Thermal resistance	40 °C/W (J-A) - achieved via HSOP8 exposed pad; enables 3 A operation without forced air in typical PCB layouts.
Soft-start duration	3.3 ms (phase two) - limits inrush current during startup while maintaining full load capability to charge output caps.

Pinout & Package

ST1S14PHR is housed in an HSOP8 package with exposed thermal pad (connected to GND), providing low thermal resistance (40 °C/W) and mechanical robustness for high-current industrial applications.

Pin/Terminal	Circuit Role	Design Meaning
1 BOOT	Bootstrap capacitor node	Drives gate of internal N-MOS high-side switch; requires 100 nF low-ESR capacitor to SW.
2 PG	Power good open-collector output	Sinks current when regulated output is within ±5% of target; requires external pull-up.
3 EN1	Active-low enable input	Device enabled when pulled ≤0.5 V; disables to <40 µA quiescent current.
4 FB	Feedback voltage input	Monitors output via resistor divider; regulates to 1.22 V reference; bias current 50 nA.
5 EN2	Active-high enable input	VIN-compatible (up to VIN+0.3 V); device enabled when ≥1.5 V; supports direct MCU GPIO control.
6 GND	Ground reference	Primary signal and power return; must be connected to exposed pad for thermal and electrical integrity.
7 VIN	Main power input	Accepts 5.5–48 V; internal UVLO ensures safe startup above 5.5 V.
8 SW	Switching node	Connects to inductor and external freewheeling diode/anode; swings from GND to VIN + boot voltage.

Key Features

Feature	Design Value
Embedded compensation network	Internal RC network (R_C = 200 kΩ, C_C = 211 pF, C_P = 24 pF) eliminates need for external loop compensation components.
Zero-load current operation	Maintains regulation with no output load - critical for standby modes in factory automation controllers.
Hiccup-mode short-circuit protection	Triggers 16 ms off-time after current foldback; prevents thermal runaway during persistent overload or output shorts.
Dual enable logic (EN1/EN2)	Supports both hardware reset (EN1) and microcontroller-controlled wake-up (EN2), enabling flexible power-state management.
Internal current limiting	Pulse-by-pulse peak current limit (3.7–5.2 A) combined with frequency foldback below 300 mV FB ensures robust fault handling.
Thermal shutdown with hysteresis	Shuts down at 150 °C (±10 °C), restarts after ~135 °C - avoids oscillation near trip point in thermally constrained enclosures.

Applications

Factory Automation Power Supply

Industrial Printer DC-DC Module

Use Scenario: Powering PLC I/O modules and servo interface circuits requiring stable 3.3 V or 5 V rails from 24 V factory bus.

IC Role / Device Role / Timing Role: Primary buck regulator delivering 3 A at 5 V with tight line/load regulation and PG signaling for system boot sequencing.

Use Value: Internal compensation and 40 °C/W thermal resistance eliminate heatsink requirements, reducing board area and BOM count.

Use Scenario: Generating 12 V/2 A rail for printhead driver ICs and stepper motor pre-drivers in high-speed inkjet printers.

IC Role / Device Role / Timing Role: High-efficiency step-down converter with hiccup protection to survive frequent printhead short events during maintenance.

Use Value: Pulse-by-pulse current limiting and automatic recovery prevent latch-up and manual reset, improving printer uptime.

High-Current LED Driver Supply

Modular DC-DC Converter Board

Use Scenario: Providing constant-voltage bias for multi-string 24 V LED arrays in industrial lighting fixtures.

IC Role / Device Role / Timing Role: Regulated buck stage preceding external constant-current LED drivers; delivers 3 A with minimal dropout.

Use Value: 850 kHz switching allows small 2.2 µH inductors and ceramic output capacitors, enabling compact, low-profile fixture designs.

Use Scenario: Core regulator on plug-in DC-DC module supporting configurable 3.3 V/5 V/12 V outputs for embedded test equipment.

IC Role / Device Role / Timing Role: Monolithic power stage with dual enable inputs and PG output - simplifies module-level power sequencing and status reporting.

Use Value: Dual EN logic and open-collector PG allow seamless integration into host controller firmware without level-shifting or additional logic.

Equivalent & Alternatives

The following parts are listed as comparable options for similar step-down regulator applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
LM5164QDRCRQ1	40 V max input, 1.5 A output, 1 MHz switching, requires external compensation.	Lacks integrated PG output and dual enable; suited for automotive AEC-Q100 environments but lower current capacity.	Choose when AEC-Q100 qualification and higher f_SW are prioritized over current rating and ease of design.
MP2451DT-LF-Z	36 V max input, 0.6 A output, 2 MHz f_SW, no PG output, no thermal shutdown hysteresis spec.	Targeted at space-constrained consumer electronics; insufficient for 3 A industrial loads.	Select only for low-power auxiliary rails where footprint is critical and thermal margin is ample.

Compared with LM5164QDRCRQ1 and MP2451DT-LF-Z, ST1S14PHR uniquely combines 3 A capability, 48 V input support, integrated PG and dual enable logic, and factory-ready thermal performance - making it the optimal choice for industrial DC-DC modules demanding reliability and design simplicity.

Availability

ST1S14PHR is available at Aetrix Electronics and suitable for factory automation power supplies, industrial printer DC-DC modules, and high-current LED driver supplies requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for ST1S14PHR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, specializing in power management, microcontrollers, and analog ICs for industrial, automotive, and consumer markets.

The ST1S14 belongs to ST's high-current monolithic buck regulator product line, designed specifically for industrial power conversion where robustness, thermal efficiency, and minimal external component count are essential.

FAQ

What is the minimum recommended output voltage for ST1S14PHR?

The ST1S14PHR regulates down to 1.22 V (its internal feedback reference), and the minimum achievable output depends on the external resistor divider accuracy and layout parasitics. The datasheet confirms stable operation at 1.22 V with proper compensation; lower voltages require external reference scaling and are not supported by the internal architecture.

Can ST1S14PHR operate with no output load?

Yes - ST1S14PHR supports zero-load current operation while maintaining regulation. Its current-mode architecture and internal compensation ensure stability across 0–3 A load range, verified per datasheet Section 7.4 and typical characteristics Figure 29 (load regulation).

How does the dual-enable logic (EN1/EN2) function together?

EN1 (active-low) and EN2 (active-high) form a 2-input NAND logic: device powers on only when EN1 = low AND EN2 = high (per Table 2). This allows independent hardware reset (EN1) and software-controlled wake-up (EN2), preventing unintended startup during brown-out or initialization sequences.

Is an external bootstrap diode required for ST1S14PHR?

No - ST1S14PHR embeds the bootstrap diode (VD1) internally, as confirmed in Figure 7 and Section 5.1. Only a 100 nF low-ESR capacitor between BOOT and SW is required; no external diode is needed, simplifying layout and improving reliability.

ST1S14PHR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 8-SOIC (0.154", 3.90mm Width) Exposed Pad

Packaging:: Tape & Reel (TR)

Product Status:: Active

Function:: Step-Down

Output Configuration:: Positive

Topology:: Buck

Output Type:: Adjustable

Number of Outputs:: 1

Voltage - Input (Min):: 5.5V

Voltage - Input (Max):: 48V

Voltage - Output (Min/Fixed):: 1.22V

Voltage - Output (Max):: 43.2V

Current - Output:: 3A

Frequency - Switching:: 850kHz

Synchronous Rectifier:: No

Operating Temperature:: -40°C ~ 125°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-HSOP

ST1S14PHR FAQ

1.How can I place an order for ST1S14PHR through Aetrix?

Please submit a Request for Quotation (RFQ) for ST1S14PHR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for ST1S14PHR reliable?

The price and inventory of ST1S14PHR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ST1S14PHR is usually 5 days.

3.What payment methods are accepted for ST1S14PHR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ST1S14PHR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ST1S14PHR?

ST1S14PHR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ST1S14PHR order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for ST1S14PHR?

For technical support, including ST1S14PHR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ST1S14PHR requirements.

6.How does Aetrix verify that ST1S14PHR is sourced from the original manufacturer or authorized distributors?

All ST1S14PHR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ST1S14PHR meets industry standards.

7.What is the process for return or replacement of ST1S14PHR?

All ST1S14PHR units undergo pre-shipment inspection (PSI). If there is an issue with ST1S14PHR, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The ST1S14PHR part is unused and in its original packaging.

Return procedure for ST1S14PHR:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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