Texas Instruments TLV61225DCKT

Overview

TLV61225DCKT from Texas Instruments is a single-cell, synchronous step-up DC-DC converter in SC-70 package, delivering fixed 3.3 V output from 0.7 V to 3.3 V input, achieving up to 94% efficiency at typical loads, with 5 µA quiescent current and integrated overvoltage/overtemperature protection - used in ultra-low-power battery-powered medical sensors and personal care devices.

For engineers reviewing the TLV61225DCKT datasheet, TLV61225DCKT pinout, TLV61225DCKT application, or TLV61225DCKT equivalent, key selection criteria include minimum startup voltage (0.7 V), pass-through behavior during shutdown, 400 mA switch current rating, and SC-70 thermal performance (R_θJA = 231.9 °C/W).

Technical Context

The TLV61225DCKT implements a hysteretic current-mode control architecture that maintains constant 200 mA inductor ripple current and adjusts offset based on load to sustain high efficiency across light-to-moderate loads. Its synchronous rectification uses two low-R_DS(on) MOSFETs (600 mΩ main switch, 1000 mΩ rectifier) to eliminate external diode losses.

Startup begins via internal oscillator when VIN < 1.8 V, transitioning to normal hysteretic operation once VOUT reaches ~1.8 V; undervoltage lockout (500 mV threshold, 50 mV hysteresis) prevents deep battery discharge, while overvoltage protection triggers at 5.5–7.5 V to safeguard downstream circuitry.

Key Specifications

Pinout & Package

TLV61225DCKT is housed in a 6-pin SC-70 (DCK) package measuring 2.00 mm × 1.25 mm, optimized for space-constrained portable designs. Thermal pad is not present; power dissipation relies on PCB trace conduction.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar step-up converter applications.

Compared with TPS61200DRCT and MAX17222ELT+T, the TLV61225DCKT offers superior low-input-voltage robustness (0.7 V vs. 0.4–0.6 V), integrated thermal protection, and simpler BOM (no feedback resistors), making it optimal for cost-sensitive, single-rail, long-life battery applications where 400 mA peak current suffices.

Availability

TLV61225DCKT is available at Aetrix Electronics and suitable for wearable health sensors, smart personal care devices, and portable diagnostic tools requiring stable component supply with guaranteed long-term manufacturability.

Supply support for TLV61225DCKT 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 designing analog ICs, embedded processors, and digital signal solutions for industrial, automotive, and consumer markets.

The TLV61225DCKT belongs to TI's low-voltage boost converter product line, engineered specifically for single-cell battery-powered applications demanding ultra-low quiescent current, wide input range, and minimal external component count.

FAQ

What is the minimum input voltage required for TLV61225DCKT to start switching?

The TLV61225DCKT starts switching at a minimum input voltage of 0.7 V, enabled by its internal start-up oscillator. This allows reliable operation across the full discharge curve of single-cell alkaline, NiMH, or Li-primary batteries. Below 0.7 V, the device remains inactive; the 500 mV UVLO threshold ensures controlled shutdown before deep discharge occurs. The TLV61225DCKT achieves this with no external components.

Does TLV61225DCKT require external feedback resistors to set the output voltage?

No, the TLV61225DCKT has an internally trimmed fixed 3.3 V output voltage. The FB pin is connected internally to a precision resistor divider and must be shorted directly to VOUT - no external resistors or capacitors are permitted. This eliminates tuning errors and reduces BOM count. All TLV61225DCKT units deliver 3.3 V ±3.3% over temperature and line/load conditions without user adjustment.

How does TLV61225DCKT behave when the EN pin is pulled low?

When EN is pulled low, the TLV61225DCKT enters full shutdown mode: switching ceases, control circuitry powers down, and quiescent current drops to 0.2–1 µA. Crucially, the internal rectifying MOSFET's body diode provides passive pass-through from VIN to VOUT, allowing the input source to directly power downstream circuitry. This behavior is confirmed in the datasheet's Figure 6 and Section 7.4.1.

What is the maximum continuous output current achievable with TLV61225DCKT?

The maximum continuous output current depends on input voltage, ambient temperature, and PCB thermal design. At VIN = 1.2 V and TA = 25°C with adequate copper area, TLV61225DCKT delivers >40 mA. At VIN = 2.4 V, output current exceeds 100 mA. The 400 mA switch current limit and R_θJA = 231.9 °C/W require thermal derating above 60°C ambient; full 400 mA is only sustainable in pulsed operation per datasheet Figure 1.

Can TLV61225DCKT be used with input sources other than batteries?

Yes, the TLV61225DCKT accepts any DC input source within 0.7–3.3 V, including energy harvesters (e.g., thermoelectric or piezoelectric generators), supercapacitors, or regulated low-voltage rails. Its hysteretic control and 5 µA quiescent current make it suitable for intermittent, micropower sources. However, input capacitance must be sized per application - TI recommends ≥10 µF ceramic at VIN to maintain stability under dynamic loading.