Texas Instruments TPS62321DRCR

Overview

TPS62321DRCR from Texas Instruments is a 500-mA, 3-MHz synchronous step-down DC-DC converter in a 10-pin QFN (3 × 3 mm) package, delivering fixed 1.5 V output with ±0.5% to +1.3% DC accuracy over –40°C to 85°C. It supports input voltage range 2.7 V to 6 V, achieves up to 93% efficiency at 3-MHz operation, and integrates active power-down sequencing - optimized for battery-powered mobile phones and smart-phones.

For engineers reviewing the TPS62321DRCR datasheet, TPS62321DRCR pinout, TPS62321DRCR application, or TPS62321DRCR equivalent, key selection criteria include its 35-ns minimum on-time, 86-µA quiescent current in power-save mode, 100% duty cycle capability for low-dropout operation, and support for external clock synchronization via MODE/SYNC pin.

Technical Context

The TPS62321DRCR employs a voltage-mode PWM controller with input voltage feed-forward for fast transient response, enabling use of small 0.9–2.2 µH inductors and 4.7–10 µF ceramic capacitors. Its dual MOSFET current limiting (P-MOS: 670–890 mA; N-MOS: ±550–±740 mA) ensures stable operation during light-load PFM and heavy-load PWM modes.

It features integrated soft-start, thermal shutdown (150°C), undervoltage lockout (2.4 V), and a dedicated discharge resistor (30–50 Ω) for controlled power-down sequencing - unique to the TPS6232x family. The MODE/SYNC pin enables on-the-fly switching between automatic PFM/PWM and forced PWM, or synchronization to an external 2.65–3.35 MHz clock signal.

Key Specifications

Pinout & Package

TPS62321DRCR is housed in a thermally enhanced 10-pin QFN package (3 mm × 3 mm, 0.5 mm pitch) with exposed PowerPAD™ connected internally to PGND for optimal thermal dissipation (R_θJA = 49°C/W).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous step-down converter applications.

Compared with TPS62320DRCR (adjustable) and TPS62313YZD (1.8 V, CSP), the TPS62321DRCR provides optimal balance of fixed 1.5-V precision, QFN thermal performance, and integrated power-down - making it the preferred choice for mainstream mobile phone core rails.

Availability

TPS62321DRCR is available at Aetrix Electronics and suitable for cell phones, smart-phones, and WLAN modules requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for TPS62321DRCR 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

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and power management ICs, with decades of expertise in high-efficiency DC-DC conversion for portable electronics.

The TPS623xx family was designed specifically for battery-powered handheld devices - emphasizing ultra-small solution size, high light-load efficiency, and robust transient response in space- and power-constrained environments.

FAQ

What is the output voltage tolerance of the TPS62321DRCR over temperature?

The TPS62321DRCR delivers a fixed 1.5 V output with a DC voltage accuracy of –0.5% to +1.3% across the full operating temperature range (–40°C to +85°C). This specification applies under PWM mode operation with no load and VI = 3.6 V, ensuring reliable core voltage regulation for sensitive digital loads without external trimming.

Does the TPS62321DRCR support external clock synchronization?

Yes, the TPS62321DRCR supports external clock synchronization via its MODE/SYNC pin. When driven by a 2.65–3.35 MHz square wave (20–80% duty cycle), the device synchronizes its P-channel MOSFET turn-on to the falling edge of the external clock - enabling deterministic phase alignment in multi-rail systems without requiring additional timing components.

What is the purpose of the integrated discharge resistor in the TPS62321DRCR?

The TPS62321DRCR integrates a 30–50 Ω discharge resistor between VOUT and PGND, activated during shutdown (EN = GND). This provides controlled power-down sequencing by rapidly discharging the output capacitor - eliminating the need for external bleeder circuits and preventing residual voltage from interfering with system reset or state retention logic.

Can the TPS62321DRCR operate with a 2.5-V input supply?

No - the TPS62321DRCR has a minimum input voltage of 2.7 V per absolute maximum ratings and recommended operating conditions. At 2.5 V, the device will not start or may fail to regulate due to undervoltage lockout activation (UVLO threshold = 2.4 V typical, with hysteresis). Sustained operation requires VIN ≥ 2.7 V.

How does the TPS62321DRCR manage efficiency at light loads?

The TPS62321DRCR automatically transitions from fixed-frequency PWM to pulse-frequency modulation (PFM) power-save mode below ~1–5 mA load (depending on VIN and L), reducing quiescent current to 86 µA. In this mode, it delivers bursts of switching cycles only when output voltage drops 1.5% below nominal - maintaining >85% efficiency at 1 mA while minimizing idle power loss.