Texas Instruments TPS65136RTERG4

Overview

TPS65136RTERG4 from Texas Instruments is a single-inductor, multiple-output (SIMO) buck-boost regulator designed for active-matrix OLED (AMOLED) display power supplies. It delivers a fixed +4.6 V/80 mA positive output and an adjustable –4.4 V/80 mA negative output from a 2.3–5.5 V input, achieving 1% output voltage accuracy, 750 mW total output power at 2.9 V input, and out-of-audio switching (20 kHz–1 MHz) to suppress audible noise in mobile phone applications.

For engineers reviewing the TPS65136RTERG4 datasheet, TPS65136RTERG4 pinout, TPS65136RTERG4 application, or TPS65136RTERG4 equivalent, key selection criteria include its SIMO topology enabling compact AMOLED biasing, dual-rail sequencing (8.7 ms delay), integrated short-circuit and thermal protection, and compatibility with 2.2 µH or 4.7 µH inductors in a 3 mm × 3 mm WQFN package.

Technical Context

The TPS65136RTERG4 implements a four-switch buck-boost converter topology using SIMO regulation, where a single inductor simultaneously supplies both positive and negative outputs. Its dual control loops regulate OUTP via FB and ground-referenced OUTN via FBG, enabling up to ±30% output current mismatch compensation.

It operates in discontinuous conduction mode (DCM) at light loads-delivering inherently perfect line-transient regulation-and transitions to continuous conduction mode (CCM) at higher loads, maintaining stable performance. Advanced power-save mode dynamically scales switching frequency from 40 kHz to 1 MHz based on load, avoiding audio-band noise while minimizing quiescent current (1.7 mA typical).

Key Specifications

Pinout & Package

TPS65136RTERG4 is housed in a 16-terminal 3 mm × 3 mm WQFN (RTE) package with exposed thermal pad connected to analog GND. The package supports reflow soldering per JEDEC Level-2-260°C-1 year MSL rating.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-rail AMOLED power supply applications.

Compared with TPS65136RTERG4, TPS65132ARSLR offers simpler fixed-rail operation but sacrifices adjustability and sequencing precision, while MAX17102ETL+ provides greater voltage/current headroom at the cost of complexity, size, and bill-of-materials overhead.

Availability

TPS65136RTERG4 is available at Aetrix Electronics and suitable for smartphone display modules, wearable OLED interfaces, and industrial HMI designs requiring stable, compact dual-rail power delivery with production-ready supply chain support.

Supply support for TPS65136RTERG4 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 display power solutions and automotive-grade reliability.

The TPS65136RTERG4 belongs to TI's AMOLED power management product line, engineered specifically to replace discrete charge pumps and dual DC/DC converters in mobile display subsystems while meeting stringent size, efficiency, and noise requirements.

FAQ

What is the recommended inductor value for TPS65136RTERG4 in a standard smartphone AMOLED application?

For most smartphone AMOLED applications, a 2.2 µH inductor (e.g., Coilcraft LPS3008-222) is recommended to balance efficiency, transient response, and solution size. A 4.7 µH inductor improves light-load efficiency and line-transient immunity but reduces maximum output current capability. Both values are fully supported per TI's design guidelines and enable stable operation without external compensation.

Does TPS65136RTERG4 support adjustable negative output voltage, and how is it configured?

Yes, TPS65136RTERG4 supports adjustable negative output voltage via the FBG pin. With FBG regulated to 0 V ±10 mV, the negative output is set using a resistor divider: R1 = 464 kΩ (connected from OUTN to FBG) and R2 = 442 kΩ (from FBG to GND) yields –4.4 V. The device allows adjustment down to –6 V by scaling R2 proportionally while maintaining ≥10 µA divider current.

How does the start-up sequencing of TPS65136RTERG4 protect AMOLED panels?

TPS65136RTERG4 enforces a fixed 8.7 ms delay between VPOS and VNEG ramp-up, ensuring the positive rail stabilizes before the negative rail begins rising. This prevents reverse-bias stress on OLED pixel TFTs and eliminates potential gate oxide damage during power-on. The negative rail remains clamped near –0.4 V until the internal timer triggers full regulation, providing robust panel-level protection.

What protection features are integrated into TPS65136RTERG4?

TPS65136RTERG4 integrates short-circuit protection on both OUTP and OUTN (clamping VNEG to –7.6 V, reducing current limit on VPOS faults), thermal shutdown at 140°C with 5°C hysteresis, undervoltage lockout (2.0–2.3 V), and overvoltage protection (5.5–7 V on VPOS). These features operate autonomously without external circuitry, ensuring reliable fault recovery in portable electronics.

Can TPS65136RTERG4 operate from a 2.5 V input, and what is its minimum functional input voltage?

Yes, TPS65136RTERG4 operates down to 2.3 V input, making it compatible with deeply discharged Li-ion cells. At VIN = 2.5 V, it delivers full 80 mA per rail with maintained 1% output accuracy and supports switching frequencies up to 1.12 MHz (per ISW limit). The undervoltage lockout releases at 2.0 V (rising) and 1.8 V (falling), ensuring clean enable/disable behavior across battery discharge profiles.