onsemi CS5253B-1GDPR5

Overview

CS5253B-1GDPR5 from onsemi is a 3.0 A adjustable low-dropout linear regulator in D2PAK-5 package, featuring remote sense capability, 1.25 V to 5.0 V output range, <0.40 V VPOWER dropout at 3.0 A, and integrated thermal shutdown, current limit, and short-circuit protection. It is designed for high-accuracy voltage regulation at the load in graphics controller power supplies.

For engineers reviewing the CS5253B-1GDPR5 datasheet, pinout, applications, or equivalent options, key selection criteria include remote-sense accuracy under dynamic load steps, dual-supply dropout behavior (VCONTROL vs. VPOWER), minimum load current requirements, thermal resistance (RJC = 2.5°C/W), and compatibility with low-ESR tantalum output capacitors.

Technical Context

The CS5253B-1GDPR5 employs a two-supply architecture: VPOWER feeds the collector of the PNP-NPN pass transistor, while VCONTROL powers the control circuitry and drives the NPN base. This separation enables ultra-low dropout-0.40 V typical at 3.0 A on VPOWER-and eliminates supply sequencing risks via built-in interlock logic that prevents unregulated turn-on.

Its Kelvin-sense topology uses dedicated VSENSE and Adjust pins to close the feedback loop directly at the load, achieving <1.0 mV load regulation error (2.5 V output, 10 mA → 3.0 A step). Transient response is tunable via an external capacitor on the Adjust pin, and stability is maintained with ≥33 µF tantalum output capacitance (ESR < 1.0 Ω).

Key Specifications

Pinout & Package

D2PAK-5 package (Case 936AC) with exposed tab electrically connected to VOUT; requires thermal pad mounting and electrical isolation if VOUT is not ground-referenced.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar adjustable LDO regulator applications.

Compared with LT1529CP#PBF and TPS7A8300RGRT, the CS5253B-1GDPR5 uniquely combines 3.0 A capability, true Kelvin remote sense, and dual-supply architecture-enabling lower thermal resistance and superior load regulation in high-current graphics and industrial applications where voltage accuracy at the point-of-load is critical.

Availability

CS5253B-1GDPR5 is available at Aetrix Electronics and suitable for graphics controller power supplies, industrial PLC I/O modules, test equipment reference rails, and medical imaging subsystems requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for CS5253B-1GDPR5 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

onsemi (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power management, analog, sensors, and connectivity solutions for automotive, industrial, cloud, and consumer markets.

The CS5253B-1GDPR5 belongs to onsemi's high-current LDO regulator product line, engineered specifically for graphics, computing, and industrial applications demanding precise remote-sense regulation, robust fault protection, and thermally efficient D2PAK packaging.

FAQ

What is the minimum required output capacitance for stable operation of the CS5253B-1GDPR5?

The CS5253B-1GDPR5 requires a minimum of 33 µF tantalum or 150 µF aluminum electrolytic output capacitor with ESR < 1.0 Ω over temperature to guarantee loop stability. This value assumes ideal layout conditions-direct VSENSE tie to load, capacitor placed adjacent to pins, and feedback ground referenced at capacitor. Remote sense configurations may require larger capacitance to maintain phase margin under dynamic load transients.

Can the CS5253B-1GDPR5 operate with only VPOWER connected and VCONTROL disconnected?

No-the CS5253B-1GDPR5 will not regulate if VCONTROL is disconnected. With only VPOWER applied, the control circuitry remains unpowered, and output current is limited to <1.0 mA. The device requires both VPOWER and VCONTROL to be within specification (VCONTROL ≥ VOUT + 0.9 V, VPOWER ≥ VOUT + 0.1 V) for full 3.0 A regulation. This interlock prevents unregulated turn-on and ensures safe startup sequencing.

How does the remote sense feature of the CS5253B-1GDPR5 improve load regulation accuracy?

The CS5253B-1GDPR5 improves load regulation accuracy by using the dedicated VSENSE pin to sample voltage directly at the load terminals, rather than at the VOUT pin. This Kelvin connection eliminates errors caused by voltage drop across PCB traces and connectors. As documented, typical load regulation measured at the sense pin is <1.0 mV for a 2.5 V output under a 10 mA to 3.0 A load step-significantly tighter than conventional 3-pin regulators.

What is the purpose of the separate VPOWER and VCONTROL pins on the CS5253B-1GDPR5?

The separate VPOWER and VCONTROL pins on the CS5253B-1GDPR5 enable a two-supply architecture that minimizes power dissipation and improves efficiency. VPOWER delivers high current to the pass transistor collector, while VCONTROL powers only the low-current control circuitry. This separation allows VPOWER dropout to be as low as 0.40 V at 3.0 A, reducing heat generation compared to single-supply LDOs where control and power share the same input.

Does the CS5253B-1GDPR5 support adjustable output voltages, and how is the output set?

Yes, the CS5253B-1GDPR5 supports adjustable output voltages from 1.25 V to 5.0 V using an external resistor divider connected between VOUT, Adjust, and ground. The internal 1.25 V ±1.0% reference appears across R1 (connected between VOUT and Adjust), and the output voltage is calculated as VOUT = 1.25 V × (1 + R2/R1) + IADJ × R2, where IADJ ≈ 50 µA flows through R2 and introduces a small error that must be accounted for in precision designs.