Texas Instruments TPS51103DRCR

Overview

TPS51103DRCR from Texas Instruments is a triple-output integrated LDO power management IC for notebook computers, featuring 5-V/100-mA and 3.3-V/100-mA switch-over LDOs plus an always-on 3.3-V/5-mA RTC LDO, all in a 10-pin QFN (DRC) package with thermal pad, operating from 4.5 V to 28 V input.

For engineers reviewing the TPS51103DRCR datasheet, TPS51103DRCR pinout, TPS51103DRCR application, or TPS51103DRCR equivalent, this device supports battery-optimized power sequencing, glitch-free rail switchover, charge-pump clock generation, and thermal shutdown - critical for portable computing power architecture validation and BOM consolidation.

Technical Context

The TPS51103DRCR integrates three independent LDO regulators with dedicated enable inputs (EN3, EN5), switchover logic that transitions VREG3/VREG5 outputs from VIN-based regulation to external V3IN/V5IN rails when thresholds are met (3.07 V / 4.65 V), and includes a non-latching thermal shutdown at 150°C.

It features a 250-kHz, 50% duty-cycle clock output (VCLK) referenced to V5IN, designed to drive external charge pumps for higher-voltage bias generation, and uses internal MOSFET switches (RDS(on) = 1.0 Ω for 5V, 1.5 Ω for 3.3V) with 1-ms delay timing for seamless switchover transitions.

Key Specifications

Pinout & Package

TPS51103DRCR is housed in a thermally enhanced 10-pin VSON (DRC) package with exposed thermal pad, measuring 3.0 mm × 3.0 mm × 0.9 mm, requiring solder connection of the thermal pad to PCB ground for reliable thermal dissipation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar triple-LDO power management applications.

Compared with TPS51103DRCR, TPS51116RGER adds high-current buck capability but removes RTC and clock functions, while TPS79533DCQ offers higher current but none of the integrated sequencing or switchover logic - making TPS51103DRCR uniquely suited for compact, battery-aware notebook auxiliary power systems.

Availability

TPS51103DRCR is available at Aetrix Electronics and suitable for notebook computers, mobile digital consumer products, and portable industrial HMIs requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for TPS51103DRCR 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 power integrity and portable system design.

The TPS51103DRCR belongs to TI's notebook-specific power management IC family, engineered to simplify auxiliary rail generation, extend battery runtime via intelligent switchover, and reduce solution size in space-constrained mobile platforms.

FAQ

What is the maximum output current capability of the VREG5 and VREG3 LDOs in the TPS51103DRCR?

The TPS51103DRCR provides 100 mA maximum output current for both the VREG5 (5-V) and VREG3 (3.3-V) LDOs under recommended operating conditions. Electrical characteristics confirm IVREG5 up to 250 mA and IVREG3 up to 250 mA in short-duration overload, but continuous operation is rated at 100 mA per LDO to maintain regulation and thermal safety. The TPS51103DRCR datasheet specifies 100 mA as the guaranteed continuous output rating across –40°C to 85°C ambient.

Does the TPS51103DRCR support automatic switchover between VIN and external V5IN/V3IN rails?

Yes, the TPS51103DRCR implements automatic, glitch-free switchover: when EN5 is high and V5IN rises above 4.65 V, VREG5 transitions from VIN-based regulation to direct V5IN connection after a 1-ms delay; similarly, EN3 high + V3IN > 3.07 V triggers VREG3 switchover. Hysteresis (4.60 V / 3.03 V) prevents chatter. This behavior is intrinsic to the TPS51103DRCR's internal control logic and requires no external firmware or timing components.

What is the purpose and electrical specification of the VCLK pin on the TPS51103DRCR?

The VCLK pin on the TPS51103DRCR delivers a 250-kHz, 50% duty-cycle clock signal used to drive external charge-pump circuits. Its voltage swing equals the GND-to-V5IN potential, and its driver impedance is 4–15 Ω (sink) or 6–15 Ω (source). The TPS51103DRCR enables VCLK automatically when V5IN exceeds 2.0 V, making it ideal for generating 10-V or 15-V gate drive for N-MOSFET load switches without external timing components.

How does the TPS51103DRCR ensure RTC functionality remains active during system sleep or power loss?

The TPS51103DRCR guarantees RTC continuity via its dedicated VRTC3 output: a 3.3-V/5-mA always-on LDO powered directly from VIN with no enable input, activated immediately upon VIN application. It operates down to 4.5 V input and maintains regulation across –40°C to 85°C. Unlike VREG3/VREG5, VRTC3 remains active regardless of EN3/EN5 state or switchover events - a core design feature of the TPS51103DRCR for timekeeping resilience.

What thermal management requirements apply to the TPS51103DRCR's DRC package?

The TPS51103DRCR uses a thermally enhanced 10-pin VSON (DRC) package with an exposed die pad that must be soldered to a PCB ground plane using multiple thermal vias. TI specifies 1.256 W power rating at TA = 25°C, derating by 12.6 mW/°C above 25°C. Without proper thermal land design - including wide copper traces, ≥6 vias (0.33 mm), and direct solder attachment - the TPS51103DRCR may exceed its 150°C junction limit under full load, triggering thermal shutdown.