Texas Instruments TPS63700DRCTG4

Overview

TPS63700DRCTG4 from Texas Instruments is a fixed-frequency inverting DC/DC converter IC generating negative output voltages down to –15 V with up to 360 mA output current, 2.7–5.5 V input range, and 84% peak efficiency. It serves as a compact bias supply for OLED displays and portable instrumentation requiring isolated negative rails.

For engineers reviewing the TPS63700DRCTG4 datasheet, TPS63700DRCTG4 pinout, TPS63700DRCTG4 application, or TPS63700DRCTG4 equivalent, key selection criteria include adjustable negative output voltage (–2 V to –15 V), 1.4 MHz switching frequency enabling small external magnetics, thermal shutdown, output overvoltage protection (–19 V), and 1.5 µA shutdown current - all in a 3 mm × 3 mm SON-10 package with PowerPAD™.

Technical Context

The TPS63700DRCTG4 implements a buck-boost topology with fixed-frequency PWM control, operating in continuous conduction mode (CCM) at medium-to-heavy loads and transitioning to discontinuous conduction mode (DCM) at light loads. Its internal error amplifier compares FB pin voltage to GND, using VREF = 1.213 V as reference for feedback divider-based output regulation.

Control logic integrates undervoltage lockout (2.35 V threshold), soft-start (ramping switch current limit), load disconnect via PMOS switch isolation, and overtemperature shutdown (150 °C trip with 5 °C hysteresis). The COMP pin requires a 4.7 nF compensation capacitor for loop stability, while VREF supplies 10 µA reference current for resistor-divider programming.

Key Specifications

Pinout & Package

The TPS63700DRCTG4 is housed in a thermally enhanced 3 mm × 3 mm VSON-10 package (DRC) with exposed PowerPAD™ for improved heat dissipation. Pin numbering follows top-view orientation with Pin 1 at top-left corner.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar inverting DC/DC converter applications.

Compared with MAX774CPA+ and LT3467EDD, the TPS63700DRCTG4 uniquely combines adjustable negative output, integrated load disconnect, output overvoltage protection, and ultra-low shutdown current in a 3 mm × 3 mm SON package - making it optimal for space-constrained, battery-sensitive applications requiring flexibility and reliability.

Availability

TPS63700DRCTG4 is available at Aetrix Electronics and suitable for portable instrumentation, OLED display biasing, and industrial sensor signal conditioning requiring stable component supply, long-lifecycle assurance, and consistent parametric performance across production batches.

Supply support for TPS63700DRCTG4 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-reliability power conversion ICs.

The TPS63700DRCTG4 belongs to TI's inverting DC/DC converter product line, designed specifically for compact, efficient generation of negative bias rails in battery-powered portable electronics where size, efficiency, and protection features are critical.

FAQ

What is the minimum input voltage required for TPS63700DRCTG4 to start switching?

The TPS63700DRCTG4 incorporates an undervoltage lockout (UVLO) function with a typical threshold of 2.35 V. Below this voltage, the device remains disabled and will not initiate switching, even if EN is asserted. Once VIN rises above 2.35 V, the converter begins soft-start sequence. This behavior ensures reliable startup and prevents erratic operation during battery brownout conditions. The TPS63700DRCTG4 datasheet specifies UVLO hysteresis of 0.25 V, meaning the device remains active until VIN drops to approximately 2.1 V.

Can TPS63700DRCTG4 generate –15 V output from a 3.3 V input?

Yes, the TPS63700DRCTG4 supports –15 V output from a 3.3 V input, but with reduced maximum output current. At VIN = 3.3 V and VOUT = –15 V, the theoretical maximum output current is approximately 100 mA, limited by power balance and switch current limit (1000 mA typical). Efficiency drops to ~65% in this configuration, and thermal management becomes critical. External components - especially the 4.7 µH inductor and low-ESR output capacitors - must be carefully selected per TI's Application Report SLVA372 to maintain stability and avoid saturation.

How does the load disconnect feature work in TPS63700DRCTG4 during shutdown?

When EN is pulled low, the TPS63700DRCTG4 disables its internal PMOS switch connecting the IN pin to the SW node, physically breaking the DC path between input source and output load. This prevents reverse current flow and eliminates leakage through the inductor and diode. Unlike basic enable/disable functions, this true load disconnect ensures zero output voltage and near-zero standby current draw from the battery - critical for long-term storage or deep-sleep modes. The TPS63700DRCTG4 achieves this without requiring external MOSFETs or additional control logic.

What is the purpose of the COMP pin on TPS63700DRCTG4, and what capacitor value is required?

The COMP pin on the TPS63700DRCTG4 provides access to the internal error amplifier compensation node. A 4.7 nF capacitor must be connected between COMP and GND to ensure stable closed-loop operation across all load and input conditions. This capacitor sets dominant pole frequency and phase margin; deviation from the recommended value risks oscillation or poor transient response. TI validates this value across –40 °C to +85 °C and confirms compatibility with X7R/X5R ceramics. The TPS63700DRCTG4 does not require additional series resistance or feed-forward elements at COMP for standard operation.

Does TPS63700DRCTG4 support power save mode, and how does it affect efficiency at light loads?

Yes, the TPS63700DRCTG4 automatically enters Power Save Mode (PSM) at light loads, transitioning from continuous conduction mode (CCM) to discontinuous conduction mode (DCM) to maintain regulation. In PSM, the controller skips switching cycles when output energy demand falls below a threshold, reducing switching losses and improving light-load efficiency. At 20 mA output and VIN = 3.6 V, efficiency remains above 75%, significantly outperforming forced-PWM alternatives. This behavior is fully internal - no external pin control or configuration is needed. The TPS63700DRCTG4 maintains ±3% output accuracy throughout PSM operation.