STMicroelectronics LDK120PU10R

Overview

LDK120PU10R from STMicroelectronics is a 200 mA, 1.0 V fixed-output low-dropout (LDO) regulator in DFN6 (1.2 × 1.3 mm) package, featuring 100 mV typical dropout at 100 mA, ±2.0% output voltage tolerance at 25 °C, and 100 µA max quiescent current - optimized for battery-powered mobile phones and digital still cameras requiring ultra-low noise and logic-controlled shutdown.

For engineers reviewing the LDK120PU10R datasheet, LDK120PU10R pinout, LDK120PU10R application, or LDK120PU10R equivalent, this page delivers verified electrical specs, thermal performance data, SOT23-5L/SOT323-5L/DFN6 package mapping, EN-controlled shutdown behavior, and real-world noise/line/load regulation metrics under −40 °C to 125 °C operation.

Technical Context

The LDK120PU10R implements a PMOS pass transistor architecture enabling ultra-low dropout and compatibility with 1 µF ceramic output capacitors. Its internal bandgap reference and error amplifier deliver tight DC accuracy (±2.0% at 25 °C) and stable transient response across load steps from 1 mA to 200 mA.

Logic-controlled enable (EN) input supports active-high operation with 0.4 V logic-low threshold and 1.2 V logic-high threshold across −40 °C to 125 °C, while integrated thermal shutdown (160 °C trip, 20 °C hysteresis) and short-circuit current limiting (400 mA typ.) ensure robust system-level protection without external components.

Key Specifications

Pinout & Package

LDK120PU10R is housed in a thermally enhanced DFN6 package (1.2 mm × 1.3 mm, 0.5 mm height) with wettable flanks for automated optical inspection. Pin 5 is OUT; Pin 1 is IN; Pin 2 is GND; Pin 3 is EN; Pin 4 is BYP (bypass capacitor connection for noise reduction); Pin 6 is N/C (must be connected to GND).

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC6219B102MR-G, LDK120PU10R offers lower dropout and integrated noise-reduction bypass capability; versus RT9013-10GB, it provides superior noise performance and wider input voltage support, making it preferable for battery-limited, noise-sensitive imaging and sensing applications.

Availability

LDK120PU10R is available at Aetrix Electronics and suitable for mobile phone power rails, digital still camera sensor supplies, wearable health monitor core logic, and industrial handheld scanner MCU supplies requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LDK120PU10R 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, Switzerland, designing and manufacturing microcontrollers, power management ICs, sensors, and analog products for automotive, industrial, and consumer markets.

The LDK120 series belongs to ST's high-performance, low-noise LDO portfolio engineered specifically for battery-powered portable electronics where ultra-low quiescent current, minimal dropout, and sub-100 µVRMS noise are mandatory design constraints.

FAQ

What is the minimum input voltage required for LDK120PU10R to maintain regulated 1.0 V output at 200 mA?

The minimum input voltage is determined by dropout: at 200 mA, typical dropout is 150 mV (max 300 mV per datasheet Table 4). Thus, VIN(min) = 1.0 V + 0.15 V = 1.15 V typical, or 1.3 V worst-case. Operation below 1.15 V risks output collapse, especially at high temperature or end-of-battery-life conditions.

Can LDK120PU10R be used with a 10 µF ceramic output capacitor instead of the recommended 1 µF?

Yes - the stability region chart (Figure 25) confirms stable operation with COUT = 1–22 µF and ESR ≤10 Ω. A 10 µF X7R ceramic capacitor (ESR ~5 mΩ) improves load transient response and further reduces output impedance above 100 kHz, though it does not lower RMS noise beyond what the BYP pin achieves.

Is the BYP pin required for basic functionality, or only for noise-sensitive applications?

The BYP pin is optional: the device operates fully functional without it. However, connecting a 10 nF capacitor between BYP and GND reduces output noise from 148 µVRMS to 51 µVRMS - essential for analog sensor, ADC, or RF circuitry. If noise is not critical, leave BYP floating (no routing or pad).

How does thermal performance differ between DFN6 and SOT23-5L packages for LDK120PU10R?

DFN6 (LDK120PU10R) has RthJA = 237 °C/W vs. SOT23-5L's 160 °C/W - meaning the DFN6 runs ~77 °C hotter at same power dissipation. However, its smaller footprint saves PCB area, and its exposed thermal pad (when soldered to copper) can reduce RthJA to ~60 °C/W with proper layout - making it viable for space-constrained, moderately loaded applications.