Texas Instruments TPS62102DRG4

Overview

TPS62102DRG4 from Texas Instruments is a synchronous buck DC-DC converter optimized for single/dual Li-ion battery-powered portable electronics. It operates from 2.5 V to 9 V input, delivers adjustable 0.8 V to 8 V output at up to 500 mA, and features dual-auto-mode switching between constant-frequency PWM (1 MHz nominal) and pulsed-variable-frequency (PFM) for high light-load efficiency. Used in GPS devices and digital still cameras for stable core voltage regulation under dynamic load.

For engineers reviewing the TPS62102DRG4 datasheet, TPS62102DRG4 pinout, TPS62102DRG4 application, or TPS62102DRG4 equivalent, key selection considerations include its 1 MHz switching frequency, auto-mode transition threshold at ~770 mV on FB, 0%–100% duty cycle support, SOIC-8 package footprint, and integrated N-FET/P-FET with 0.3 Ω/0.5 Ω R_DS(on) at 7.2 V.

Technical Context

The TPS62102DRG4 implements a voltage-mode PWM controller with an internal 0.8-V reference and tri-state MODE pin enabling forced-PWM, forced-PFM, or automatic mode selection based on load current detection. Its error amplifier features 80 dB open-loop gain and 5 MHz unity-gain bandwidth, supporting stable compensation with ceramic output capacitors.

It integrates dual FETs (N-channel high-side and P-channel low-side), supports external synchronization up to 1.61 MHz via SD/SYNC pin, and includes three-stage overcurrent protection (200 mA pulse termination, 1 A hard-limit, 1.2 A soft-start trigger) plus thermal shutdown at 170°C junction temperature.

Key Specifications

Pinout & Package

TPS62102DRG4 is housed in an 8-pin SOIC (D package), surface-mount, RoHS-compliant package with standard 1.27 mm pitch and 6.2 mm × 5.3 mm body size.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS62102DRG4, TPS62040DGQR offers higher integration and frequency but sacrifices output adjustability and auto-mode flexibility, while TPS62231DRYR trades current capacity and intelligent light-load management for compactness and EMI performance in low-power edge nodes.

Availability

TPS62102DRG4 is available at Aetrix Electronics and suitable for GPS devices, digital still cameras, and cellular telephones requiring stable component supply across extended production lifecycles and battery-operated field deployments.

Supply support for TPS62102DRG4 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 technologies, with decades of expertise in high-efficiency DC-DC conversion for portable and industrial applications.

The TPS6210x product line was designed specifically for Li-ion battery-powered portable electronics, emphasizing multimode efficiency, small solution size, and robust protection for mission-critical handheld and mobile systems.

FAQ

What is the maximum switching frequency achievable with TPS62102DRG4 via external synchronization?

The TPS62102DRG4 supports external synchronization up to 1.61 MHz, as specified in the electrical characteristics table for the 1 MHz version. This limit ensures stable PWM gain and noise immunity; exceeding it risks reduced sawtooth amplitude and degraded duty-cycle control. The device must be synchronized below this threshold to maintain regulation accuracy and loop stability in TPS62102DRG4 designs.

How does the auto-mode transition threshold work in TPS62102DRG4?

The TPS62102DRG4 auto-mode transition is governed by FB pin voltage thresholds: it exits constant-frequency mode when FB falls to ~770 mV (3.75% below nominal), and re-enters it when FB rises above ~808 mV. These thresholds correspond to load currents near 100 mA and ensure smooth PWM↔PFM handover without output voltage droop or overshoot. This behavior is confirmed in the Light Load Detectors section of the SLUS446B datasheet for TPS62102DRG4.

Can TPS62102DRG4 operate from a single Li-ion cell without external components?

Yes - the TPS62102DRG4 supports input voltages as low as 2.5 V, making it compatible with discharged single Li-ion cells (2.5–4.2 V). Its 0.8 V minimum output allows direct regulation for ultra-low-voltage processors. No external level-shifting or pre-bias circuits are required, as verified in the "design example: automatic mode switching converter, single li-ion cell input, 1.8-V output" (Figure 14) of the TPS62102DRG4 datasheet.

What is the purpose of the AGND and PGND separation in TPS62102DRG4?

AGND serves as the quiet reference for the error amplifier, feedback divider, and internal voltage references, while PGND carries high di/dt switch-node return currents. Separating them minimizes noise coupling into the feedback path - critical for maintaining ±1.5% output accuracy and preventing oscillation. The datasheet explicitly states AGND is "the reference point for the internal reference and all thresholds," and recommends tying AGND and PGND at a single point near the IC to preserve TPS62102DRG4 stability.

Does TPS62102DRG4 require an external Schottky diode in all operating modes?

No - the TPS62102DRG4 integrates both N-FET and P-FET for synchronous rectification, eliminating the need for an external Schottky diode in standard operation. However, the datasheet's typical application circuit (Figure 9) includes D1 (10BQ040) as an optional catch diode for fault protection during startup or overload. Its presence is not required for normal PWM or PFM operation but adds robustness in high-reliability TPS62102DRG4 implementations.