onsemi CS5253B-8GDPR5G

Overview

CS5253B-8GDPR5G from onsemi is a 3.0 A, 2.5 V fixed-output low-dropout linear regulator in D2PAK-5 package with remote sense capability, <0.40 V VPOWER dropout at 3.0 A, thermal shutdown, and current limiting - designed for high-accuracy voltage regulation at graphics controller loads on VGA cards.

For engineers reviewing the CS5253B-8GDPR5G datasheet, pinout, applications, or equivalent options, key selection criteria include remote-sense accuracy (<1.0 mV load regulation), dual-supply architecture (VCONTROL/VPOWER separation), Pb-free D2PAK-5 thermal performance (RJC = 2.5°C/W), and compatibility with low-ESR ceramic output capacitors (≥33 µF).

Technical Context

The CS5253B-8GDPR5G uses a PNP–NPN pass transistor pair with physically separated VPOWER (collector) and VCONTROL (base drive) supplies to minimize internal power dissipation. Its error amplifier employs Kelvin-connected VSENSE to regulate voltage directly at the load, decoupling output accuracy from PCB trace resistance.

Control loop stability is optimized for 33 µF ceramic output capacitance with ESR <10 mΩ, and transient response is tuned for load steps from 10 mA to 3.0 A at 15–80 A/s slew rates. Protection includes foldback short-circuit current limiting (~3.5 A), thermal shutdown activation at ~150°C with 25°C hysteresis, and overcurrent cutoff at 4.0 A.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with LT1582CS8#PBF and TPS7A8300RGRT, the CS5253B-8GDPR5G uniquely combines dedicated Kelvin sensing, D2PAK-5 thermal performance (RJC = 2.5°C/W), and <0.40 V dropout in a single-source-qualified part - making it optimal for retrofitting legacy graphics power systems without layout changes.

Availability

CS5253B-8GDPR5G is available at Aetrix Electronics and suitable for VGA graphics card manufacturing, industrial FPGA power delivery, and medical imaging sensor biasing requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for CS5253B-8GDPR5G 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 delivering energy-efficient silicon solutions for automotive, industrial, cloud, medical, and edge applications.

The CS5253B-8GDPR5G belongs to onsemi's high-current LDO family engineered specifically for remote-sense precision power in graphics, imaging, and FPGA subsystems - prioritizing thermal resilience, low dropout, and load-point accuracy over general-purpose flexibility.

FAQ

What is the maximum allowable VPOWER input voltage for the CS5253B-8GDPR5G?

The CS5253B-8GDPR5G specifies a maximum VPOWER input voltage of 6.0 V. Exceeding this rating risks permanent damage to the internal PNP–NPN pass transistor. This limit applies regardless of VCONTROL voltage or load current, and remains valid across the full operating junction temperature range (0°C to 150°C). Always verify input rail tolerances and transient spikes stay within this bound when designing with CS5253B-8GDPR5G.

Can the CS5253B-8GDPR5G operate with only VCONTROL powered and VPOWER disconnected?

Yes - the CS5253B-8GDPR5G can supply up to 50 mA through VOUT when only VCONTROL is powered (up to 13 V) and VPOWER is left open. This mode is documented in the Electrical Characteristics table under "VCONTROL Supply Only Output Current." However, full 3.0 A operation requires both VCONTROL ≥ 3.9 V and VPOWER ≥ 3.13 V; the CS5253B-8GDPR5G will not regulate at rated current with VPOWER floating.

Does the CS5253B-8GDPR5G require an output capacitor, and what type is recommended?

Yes, the CS5253B-8GDPR5G requires a minimum 33 µF output capacitor for stability, as confirmed in Figure 5 and the DESIGN GUIDELINES section. Ceramic capacitors with ESR <10 mΩ are recommended - electrolytic or tantalum types are not required. The device is optimized for low-ESR ceramics, and using higher-ESR capacitors may cause oscillation or poor transient response. Always place the capacitor close to the VOUT and GND pins of the CS5253B-8GDPR5G.

How does the remote sense feature of the CS5253B-8GDPR5G improve regulation accuracy?

The CS5253B-8GDPR5G uses dedicated VSENSE pin to close the feedback loop directly at the load, bypassing voltage drops across PCB traces and connectors. This reduces load regulation error to <1.0 mV (for 2.5 V output, 10 mA → 3.0 A step), versus typical 10–50 mV errors in non-sensing LDOs. To realize this benefit, VSENSE must be routed as a Kelvin pair - separate from high-current VOUT traces - and tied to the load's positive terminal, as shown in Figure 16 of the datasheet for CS5253B-8GDPR5G.

Is the CS5253B-8GDPR5G pin-compatible with earlier CS5253-1 variants?

No - the CS5253B-8GDPR5G is not pin-compatible with the CS5253-1. While both use D2PAK-5 packages and share the same pinout numbering, the CS5253B-8GDPR5G is optimized for lower output capacitance (33 µF vs. 330 µF) at the expense of slower transient response, and its internal compensation differs. The datasheet explicitly states the CS5253B-8GDPR5G is "optimized from the CS5253-1", indicating functional differences that preclude direct substitution without validation. Always consult the specific application notes for each variant before interchanging CS5253B-8GDPR5G and CS5253-1.