Texas Instruments UCD7100PWPR

Overview

UCD7100PWPR from Texas Instruments is a digital control compatible single low-side ±4-A MOSFET gate driver with integrated current sense comparator and programmable cycle-by-cycle current limit protection. It interfaces digital power controllers (e.g., UCD9110) to power stages in single-ended topologies, delivers 10-ns rise/fall times into 2.2-nF loads, features a 3.3-V/10-mA internal regulator, and operates across –40°C to 105°C for digitally controlled DC/DC converters.

For engineers reviewing the UCD7100PWPR datasheet, UCD7100PWPR pinout, UCD7100PWPR application, or UCD7100PWPR equivalent, key selection criteria include its 25-ns CS-to-OUT propagation delay, ±4-A TrueDrive™ output architecture optimized for Miller plateau drive, 4.5–15-V supply range, programmable ILIM threshold (0.25–1.0 V), and latched CLF flag for host-controller fault monitoring in safety-critical power stages.

Technical Context

The UCD7100PWPR implements a dedicated analog current-sense path with 25-ns propagation delay from CS to OUT, enabling hardware-level cycle-by-cycle overcurrent shutdown independent of host controller response time. Its TrueDrive™ output stage combines bipolar and MOSFET transistors to deliver ±4-A peak current during the Miller plateau region, ensuring fast MOSFET turn-on/turn-off under heavy capacitive gate loads.

It integrates a 3.3-V linear regulator (10-mA capable) for powering external digital controllers, accepts 3.3-V logic inputs up to 2 MHz with Schmitt-triggered IN pin, and uses separate PVDD and VDD rails to isolate high-current output switching noise from logic supply. The CLF flag is latched high on current-limit detection and reset only by the next rising edge of IN-enabling deterministic handshaking during startup and fault recovery.

Key Specifications

Pinout & Package

UCD7100PWPR is housed in a thermally enhanced HTSSOP-14 package (5.00 mm × 4.40 mm) with PowerPAD™ exposed thermal pad for improved heat dissipation in high-current gate drive applications.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar MOSFET driver applications.

Compared with UCC27524ADRV and LM5113SD, the UCD7100PWPR uniquely integrates current sense comparison, programmable threshold, and latched digital fault flag-making it the only option among the three that provides autonomous, sub-30-ns overcurrent shutdown without external components or controller overhead.

Availability

UCD7100PWPR is available at Aetrix Electronics and suitable for digitally controlled DC/DC converters, motor phase drivers, and telecom rectifier modules requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for UCD7100PWPR 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 company specializing in analog, embedded processing, and power management technologies, with leadership in high-reliability industrial and automotive-grade components.

The UCD7K family-including UCD7100PWPR-is designed specifically for digital power systems requiring local, hardware-enforced current limiting and seamless interface to TI's UCD9xxx digital power controllers.

FAQ

What is the function of the CLF pin on the UCD7100PWPR?

The CLF (Current Limit Flag) pin on the UCD7100PWPR is an open-drain digital output that goes high when the CS pin voltage exceeds the ILIM threshold minus 25 mV, indicating an overcurrent event. It remains latched high until the next rising edge on the IN pin-ensuring the host controller reliably detects every fault condition. This behavior is integral to the UCD7100PWPR's autonomous protection architecture and enables deterministic handshaking during startup and recovery sequences.

How does the UCD7100PWPR implement cycle-by-cycle current limiting?

The UCD7100PWPR implements cycle-by-cycle current limiting through a dedicated high-speed analog comparator that continuously monitors the CS pin against a user-programmed threshold set by the ILIM pin. When CS exceeds ILIM − 25 mV, the driver forces OUT low within 25 ns and asserts CLF high. This hardware-level response occurs independently of the host controller, allowing the UCD7100PWPR to protect the power stage even if the digital controller hangs or fails to respond-making it essential for safety-critical power designs using UCD7100PWPR.

What is the purpose of having separate VDD and PVDD pins on the UCD7100PWPR?

The UCD7100PWPR uses separate VDD and PVDD pins to electrically isolate the logic and regulation circuitry from the high-current output stage. VDD (4.5–15 V) powers internal logic, the 3.3-V regulator, and comparators, while PVDD (same voltage range) supplies only the TrueDrive™ output transistors. This separation prevents switching noise from the gate-drive path from coupling into sensitive analog and digital sections-maintaining stable 3V3 regulation, accurate current sensing, and clean IN signal integrity. It is a critical design feature of the UCD7100PWPR for high-performance digital power systems.

Can the UCD7100PWPR drive high-side MOSFETs?

No, the UCD7100PWPR is explicitly designed as a low-side gate driver and cannot directly drive high-side N-channel MOSFETs. Its OUT pin is referenced to PGND and lacks a floating bootstrap or charge-pump circuit required for high-side operation. The UCD7100PWPR is intended for low-side switching in buck, flyback, or half-bridge configurations where the MOSFET source connects to ground. For high-side drive, TI recommends complementary devices such as the UCD7242 or external bootstrap gate drivers used alongside UCD7100PWPR in dual-channel topologies.

What happens to the UCD7100PWPR outputs when VDD falls below UVLO threshold?

When VDD drops below the under-voltage lockout (UVLO) threshold-minimum 4.25 V, typical 4.5 V-the UCD7100PWPR disables all internal circuitry and forces the OUT pins low to ensure safe shutdown of the connected MOSFET. The 3V3 regulator ceases regulation, CLF is deasserted, and the device enters a high-impedance state except for the output stage, which actively pulls OUT to PGND. This behavior is specified in the UCD7100PWPR absolute maximum ratings and ensures fail-safe operation during brownout conditions without requiring external supervision.