Texas Instruments LM2619ATL/NOPB

Overview

LM2619ATL/NOPB from Texas Instruments is a 500-mA, current-mode synchronous buck DC-DC converter in a 10-bump thin DSBGA package, operating from 2.8 V to 5.5 V input and delivering adjustable output voltages from 1.5 V to 3.6 V. It supports pin-selectable PWM (600 kHz), PFM (160 µA quiescent), and shutdown (0.02 µA) modes, with internal synchronous rectification and external compensation for mobile power rails.

For engineers reviewing the LM2619ATL/NOPB datasheet, LM2619ATL/NOPB pinout, LM2619ATL/NOPB application, or LM2619ATL/NOPB equivalent, key selection considerations include its 10-bump DSBGA footprint, ±1% DC feedback voltage precision, 200 ns minimum PFET on-time, thermal shutdown at 150°C, and SYNC/MODE-controlled mode switching between low-noise PWM and battery-saving PFM operation.

Technical Context

The LM2619ATL/NOPB implements a current-mode buck architecture with internal PFET switch and NFET synchronous rectifier. Its error amplifier drives EAOUT based on FB–EANEG differential input, while PWM mode uses slope-compensated current sensing and fixed 600 kHz oscillator timing; PFM mode relies on hysteretic comparator thresholds (24 mV typical hysteresis at FB).

Mode selection is fully digital via SYNC/MODE pin logic levels: high (>1.3 V) enables PWM, low (<0.4 V) enables PFM, and external 500–1000 kHz clock synchronizes PWM frequency. EN pin provides Schmitt-triggered shutdown control, and soft-start ramps the internal reference to limit inrush current during startup.

Key Specifications

Pinout & Package

LM2619ATL/NOPB uses a 10-bump, 0.5-mm pitch, thin DSBGA (YPA) package optimized for space-constrained mobile applications. Board area required is only 375 mm² (0.58 in²). Assembly requires precision placement and reflow profile control due to fine-pitch bump geometry.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS62231DRYT and MAX8640YETA+, the LM2619ATL/NOPB uniquely balances ultra-compact DSBGA packaging, dual-mode efficiency optimization (600 µA PWM / 160 µA PFM), and external compensation flexibility-making it optimal for Li-ion-powered handhelds where board area, battery life, and transient performance are co-constrained.

Availability

LM2619ATL/NOPB is available at Aetrix Electronics and suitable for mobile phones, hand-held radios, wireless LAN cards, and RF PC cards requiring stable component supply with long-term lifecycle support and traceable sourcing.

Supply support for LM2619ATL/NOPB 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 delivering analog, embedded processing, and connectivity solutions with emphasis on power management innovation and high-reliability manufacturing.

The LM2619ATL/NOPB belongs to TI's sub-miniature DC-DC converter product line, designed specifically for space- and battery-life-critical portable RF devices such as mobile handsets and wireless communication modules.

FAQ

What is the minimum input voltage required for stable operation of the LM2619ATL/NOPB?

The LM2619ATL/NOPB requires a minimum input voltage of 2.8 V for stable regulation across its full output range (1.5 V to 3.6 V). Below this threshold, the device may enter undefined behavior or fail to start; the EN pin must be held low during system power-up until VIN exceeds 2.8 V to prevent malfunction. Absolute maximum rating for PVIN is 6 V.

How does the LM2619ATL/NOPB achieve high efficiency at low output voltages?

The LM2619ATL/NOPB achieves high efficiency at low output voltages primarily through internal synchronous rectification-replacing the forward voltage drop of an external Schottky diode (~0.3 V) with the conduction loss of an integrated NFET (330 mΩ typical). This design yields up to 96% efficiency at 3.6 V_OUT/200 mA and maintains strong performance down to 1.5 V_OUT, especially when paired with low-DCR inductors.

Can the LM2619ATL/NOPB be synchronized to an external clock, and what are the valid frequency and duty-cycle ranges?

Yes, the LM2619ATL/NOPB can be synchronized to an external clock applied to the SYNC/MODE pin. Valid synchronization frequencies span 500 kHz to 1000 kHz. The clock must have a duty cycle between 30% and 70%; a 50% duty cycle is recommended. Clock overshoot/undershoot must remain below ±100 mV relative to GND or VDD, and slew rate should exceed 5 V/100 µs to ensure reliable edge detection.

What protection features are integrated into the LM2619ATL/NOPB?

The LM2619ATL/NOPB integrates current overload protection (620–1100 mA peak switch limit), thermal shutdown (trip at 150°C, restart at 130°C), overvoltage protection (OVP triggers ~100 mV above regulation threshold), and internal soft-start. These features operate autonomously without external components and protect both the LM2619ATL/NOPB and downstream circuitry during fault conditions including short circuits, overtemperature, and excessive load transients.

Is external compensation mandatory for stable operation of the LM2619ATL/NOPB, and what are the recommended starting values?

Yes, external compensation is mandatory for stable closed-loop operation of the LM2619ATL/NOPB. The device requires a network between EAOUT and EANEG pins-typically a series R3 (22 kΩ–100 kΩ) and C4 (220 pF–1 nF), plus optional C5 (10 pF) across EAOUT–EANEG for noise immunity. Starting values of R3 = 47 kΩ, C4 = 470 pF, and C5 = 10 pF provide robust stability across common output capacitors and load conditions; final values must be validated on bench for target transient response.