Texas Instruments TPS40222DRPR

Overview

TPS40222DRPR from Texas Instruments is a non-synchronous buck converter IC with internal 250 mΩ N-channel MOSFET, fixed 1.25-MHz switching frequency, 0.8-V ±1% reference, 4.5–8-V input range, and 0–1.6-A output capability. It delivers point-of-load power for ASICs and disk drives using a compact 3 mm × 3 mm SON-6 package.

For engineers reviewing the TPS40222DRPR datasheet, TPS40222DRPR pinout, TPS40222DRPR application, or TPS40222DRPR equivalent, key selection criteria include its current-mode control architecture, integrated soft-start (550 µs typical), thermal shutdown (150°C), frequency foldback under overcurrent, and internal loop compensation eliminating external compensation components.

Technical Context

The TPS40222DRPR employs fixed-frequency current-mode PWM control with pulse-by-pulse overcurrent protection and automatic frequency foldback below 0.4 V on FB. Its transconductance error amplifier (10 µS) uses internal 2 MΩ/16 pF compensation to stabilize regulation without external components.

Startup behavior is governed by undervoltage lockout (turn-on at 3.8 V ±0.2 V), internal soft-start ramping the error amplifier's non-inverting input to 0.8 V in ~550 µs, and oscillator frequency scaling from ~140 kHz to 1.25 MHz as FB rises from 0 V to 0.6 V.

Key Specifications

Pinout & Package

TPS40222DRPR uses a 6-pin VSON (DRP) package with exposed thermal pad (θ_JC = 2°C/W). The pad must be soldered to PCB ground for thermal and electrical integrity.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar buck converter applications.

Compared with TPS40222DRPR, TPS54227DRCT offers higher integration for efficiency-critical designs but requires layout changes and lacks pin compatibility, while LM2678SX-3.3/NOPB provides higher current and input voltage range at the cost of size, frequency, and flexibility-making TPS40222DRPR optimal for space-constrained 5-V systems needing adjustable low-voltage outputs.

Availability

TPS40222DRPR is available at Aetrix Electronics and suitable for disk drive power supplies, ASIC core voltage regulation, and point-of-load converters requiring stable component supply with guaranteed long-term availability.

Supply support for TPS40222DRPR 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 and embedded processing technologies, with decades of expertise in power management ICs.

The TPS402xx family targets cost-sensitive, space-constrained DC-DC conversion in consumer and computing applications, emphasizing minimal external components, high-frequency operation, and robust protection features.

FAQ

What is the maximum output current supported by the TPS40222DRPR?

The TPS40222DRPR supports up to 1.6 A of continuous output current under recommended operating conditions (T_J ≤ 125°C, V_IN = 4.5–8 V). Its overcurrent threshold is 2.1–3.1 A, and thermal shutdown activates at 150°C to protect against sustained overload. Actual achievable current depends on PCB thermal design, ambient temperature, and output voltage-e.g., 1.6 A is confirmed at 3.3 V with proper copper pour and vias under the exposed pad.

Does the TPS40222DRPR require external compensation components?

No, the TPS40222DRPR does not require external compensation components. It integrates a transconductance error amplifier with fixed internal compensation (2 MΩ resistor and 16 pF capacitor), enabling stable operation with only the output inductor and capacitor selected per Table 2 in the datasheet. This eliminates tuning effort and reduces BOM count versus controllers requiring external Type-II or Type-III networks.

How does the TPS40222DRPR handle short-circuit conditions?

The TPS40222DRPR responds to short-circuit events using dual protection: pulse-by-pulse current limiting triggers when sensed switch current exceeds 2.1–3.1 A, and frequency foldback reduces switching frequency from 1.25 MHz to ~75–140 kHz as FB voltage drops below 0.4 V. If the fault persists, the internal soft-start capacitor discharges, halting switching until recovery. This limits power dissipation and prevents thermal damage without requiring external circuitry.

What is the purpose of the BOOST pin on the TPS40222DRPR?

The BOOST pin on the TPS40222DRPR provides a bootstrapped gate-drive voltage for the internal N-channel MOSFET. During the off-time, a 33-nF capacitor charges from PVIN through the internal diode; during on-time, the capacitor lifts the gate voltage above PVIN, ensuring full enhancement of the MOSFET. This enables efficient high-side switching without an external high-voltage gate driver, and a Schottky diode may be added externally if internal diode drop causes insufficient boost voltage.

Can the TPS40222DRPR operate with an input voltage below 4.5 V?

No, the TPS40222DRPR cannot reliably operate below 4.5 V. Its absolute maximum rating for AVIN/PVIN is –2 V to 16 V, but the recommended operating input range is strictly 4.5 V to 8 V. Below 4.5 V, undervoltage lockout remains active (V_ON = 3.6–4.0 V), disabling the oscillator and holding the MOSFET off. Attempting operation at 4.0 V will result in no switching and unregulated output, as confirmed in the Absolute Maximum and Recommended Operating Conditions tables.