STMicroelectronics LD59015C15R

Overview

LD59015C15R from STMicroelectronics is a 150 mA low-noise, high-PSRR linear voltage regulator delivering a fixed 1.5 V output with ±1.8% accuracy at 25 °C, 2.4–5.5 V input range, 150 mV typical dropout at 150 mA, and 20 µV_RMS output noise - deployed in battery-powered mobile phones and PDAs for clean power to RF and analog circuitry.

For engineers reviewing the LD59015C15R datasheet, LD59015C15R pinout, LD59015C15R application, or LD59015C15R equivalent, key selection criteria include PSRR performance (80 dB @ 100 Hz), ultra-low quiescent current (31 µA typ. at no load), logic-controlled shutdown (<1 µA OFF mode), ceramic capacitor compatibility, and SOT323-5L thermal limits (125 °C max junction).

Technical Context

The LD59015C15R implements a bandgap-referenced LDO architecture with internal trimming for 1.5 V output, integrated thermal shutdown (160 °C trigger, 20 °C hysteresis), and current-limit protection (200 mA short-circuit). Its enable input accepts TTL-compatible logic levels (V_EN < 0.4 V for OFF, > 0.9 V for ON) and draws only 0.1–100 nA input current.

PSRR rolls off from 80 dB at 100 Hz to 54 dB at 100 kHz, optimized for suppression of switching noise from upstream DC-DC converters. Dropout behavior is specified down to 150 mV at full 150 mA load, with stable operation using ≥1 µF ceramic output capacitance and ESR ≤10 Ω.

Key Specifications

Pinout & Package

Package: SOT323-5L - 5-pin ultra-small surface-mount package (2.2 × 1.35 × 0.9 mm), thermally enhanced for 125 °C continuous operation, ECOPACK® compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC6210B152MR-G and ADP160ACBZ-1.5-R7, the LD59015C15R uniquely combines 80 dB PSRR, 20 µV_RMS noise, integrated enable, and SOT323-5L thermal robustness - making it optimal for compact, battery-powered RF systems requiring both precision and controllability.

Availability

LD59015C15R is available at Aetrix Electronics and suitable for mobile handsets, wearable health sensors, Bluetooth LE audio earbuds, and industrial wireless sensor nodes requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LD59015C15R 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 devices for automotive, industrial, and consumer markets.

The LD59015 belongs to ST's high-performance LDO portfolio targeting ultra-low-noise, high-PSRR regulation in space-constrained, battery-powered applications - emphasizing efficiency, precision, and robustness under dynamic load and thermal conditions.

FAQ

What is the minimum input voltage required for stable 1.5 V output at 150 mA load?

The LD59015C15R requires VIN ≥ VOUT + VDROP = 1.5 V + 0.15 V = 1.65 V minimum. However, the datasheet specifies a guaranteed 2.4 V minimum operating input voltage across temperature and process variation to ensure 150 mA output capability and PSRR performance compliance.

Can the LD59015C15R operate with a 0.47 µF ceramic output capacitor?

No - the device requires a minimum 1 µF ceramic output capacitor (X5R/X7R) for stability, as confirmed by electrical characteristics Table 5 and Figure 11 (ESR vs. COUT). Using 0.47 µF risks oscillation or degraded transient response, especially under load steps up to 150 mA.

Does the N.C. pin (Pin 4) require PCB routing or grounding?

Pin 4 is internally not connected and must remain unconnected on the PCB. ST's layout guidelines explicitly prohibit routing or grounding this pin, as doing so may compromise thermal performance or induce parasitic coupling due to its proximity to the die substrate in the SOT323-5L package.

How does thermal shutdown behave during sustained overload?

When junction temperature reaches 160 °C, thermal shutdown activates and disables the output. After cooling by ≥20 °C hysteresis, the device automatically resumes regulation without external reset. This cycle repeats if overload persists - protecting against permanent damage while maintaining system-level fault resilience.