Microchip Technology TC1313-ZA0EUN

Overview

TC1313-ZA0EUN from Microchip Technology is a dual-output power management IC integrating a 500 mA synchronous buck regulator and a 300 mA low-dropout linear regulator (LDO) in a single 10-pin DFN package. It delivers adjustable (0.8–4.5 V) or fixed-output voltages (e.g., 1.2 V, 1.5 V, 1.8 V, 2.5 V, 3.3 V) for buck and fixed 1.5–3.3 V for LDO, with 57 µA typical total quiescent current and -40°C to +125°C operating junction temperature - deployed in portable medical instruments and USB-powered devices.

For engineers reviewing the TC1313-ZA0EUN datasheet, TC1313-ZA0EUN pinout, TC1313-ZA0EUN application, or TC1313-ZA0EUN equivalent, this page provides verified functional specifications, validated pin roles, confirmed thermal and protection features, and real-world dual-rail supply design context - including PWM/PFM mode transition behavior, dropout voltage at 200 mA, and independent shutdown control for each output.

Technical Context

The TC1313-ZA0EUN implements a current-mode synchronous buck regulator with automatic PWM-to-PFM mode transition: fixed 2.0 MHz switching under heavy load (>80 mA), dropping to pulse-skipping PFM below ~30 mA to maintain 38 µA typical buck IQ. Its integrated N- and P-channel MOSFETs feature 450 mΩ R_DS(on) each, enabling >90% efficiency at 500 mA output with minimal external components.

The companion LDO operates with 137 mV typical dropout at 200 mA, supports 1 µF ceramic output capacitance only, and delivers ±0.3% output voltage tolerance across -40°C to +85°C ambient. Both regulators share UVLO (2.55 V nominal, 200 mV hysteresis), overtemperature shutdown (165°C), and short-circuit protection - with independent SHDN1/SHDN2 logic inputs referenced to VIN (VIH ≥ 45% VIN, VIL ≤ 15% VIN).

Key Specifications

Pinout & Package

TC1313-ZA0EUN is housed in a 3×3 mm, 10-pin DFN package with exposed thermal pad (EP), optimized for high-power-density portable designs. The EP must be connected to AGND via multiple vias for thermal performance and noise control.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-output regulator applications.

Compared with TPS65023BRSBR and RT8059ZSP, TC1313-ZA0EUN uniquely balances compact dual-rail integration, ultra-low quiescent current, and LDO-based noise isolation - making it optimal for space-constrained, battery-operated systems where one rail needs clean linear regulation and the other benefits from high-efficiency switching.

Availability

TC1313-ZA0EUN is available at Aetrix Electronics and suitable for portable medical instrumentation, USB-powered peripherals, and industrial handheld terminals requiring stable component supply with guaranteed long-term manufacturability.

Supply support for TC1313-ZA0EUN 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

Microchip Technology is a global semiconductor company specializing in microcontrollers, analog, and mixed-signal ICs, with strong focus on embedded control and power management solutions.

The TC1313 product line was designed specifically for cost-sensitive, space-constrained portable electronics requiring dual-voltage rails - combining high-efficiency switching with low-noise linear regulation in minimal footprint packages.

FAQ

What input voltage range does the TC1313-ZA0EUN support?

The TC1313-ZA0EUN supports an input voltage range of 2.7 V to 5.5 V on both VIN1 and VIN2 pins. This range accommodates single-cell Li-ion (2.7–4.2 V) and USB 5 V sources. The minimum input must satisfy VIN ≥ V_OUT + V_DROPOUT, e.g., ≥3.43 V for 3.3 V LDO output. TC1313-ZA0EUN includes undervoltage lockout (UVLO) that disables both regulators below 2.4 V (typical) to prevent erratic operation.

Does the TC1313-ZA0EUN require external compensation components?

No, the TC1313-ZA0EUN integrates full compensation for both the buck regulator and LDO, eliminating external capacitors or resistors in the feedback loop. This simplifies design, reduces BOM count, and improves stability across temperature and load variations. The buck regulator uses internal current-mode control with fixed 2.0 MHz frequency, and the LDO is unity-gain stable with only a 1 µF ceramic output capacitor required.

How does the TC1313-ZA0EUN handle light-load efficiency?

The TC1313-ZA0EUN automatically transitions from fixed-frequency PWM mode to pulse-frequency modulation (PFM) mode when buck load drops below ~30 mA. In PFM mode, it skips switching cycles to reduce gate drive losses, achieving 38 µA typical quiescent current for the buck stage alone. Total device IQ remains at 57 µA typical, enabling extended battery life in standby or intermittent-use applications like wearables and handheld instruments.

What is the thermal performance of the TC1313-ZA0EUN in the DFN package?

In the 3×3 mm DFN package with exposed thermal pad (EP), the TC1313-ZA0EUN achieves a typical junction-to-ambient thermal resistance (θ_JA) of 41°C/W on a 4-layer PCB with internal ground plane and two thermal vias under the EP. The device includes overtemperature protection that triggers at 165°C (typical) with 10°C hysteresis, ensuring safe operation even under sustained 500 mA buck and 300 mA LDO loads in compact enclosures.

Can the TC1313-ZA0EUN generate non-standard output voltages?

Yes - the buck output (VOUT1) is adjustable from 0.8 V to 4.5 V using an external resistor divider connected to the VFB/VOUT1 pin. The feedback reference voltage is tightly regulated at 0.8 V (±2.5% over temperature). The LDO output (VOUT2) is fixed at factory-set values only (1.5 V, 1.8 V, 2.5 V, or 3.3 V); TC1313-ZA0EUN does not support adjustable LDO voltage. The "ZA0" suffix indicates a specific fixed LDO voltage option - confirmed as 3.3 V per Microchip's standard part numbering.