Renesas ISL97519AIUZ-TK

Overview

ISL97519AIUZ-TK from Intersil is a high-efficiency, constant-frequency PWM step-up regulator with integrated 2.0A/200mΩ MOSFET, 600kHz/1.2MHz selectable switching frequency, 2.3V–5.5V input range, and up to 25V output capability. It delivers >90% efficiency at 1A load and features adjustable soft-start, thermal protection, and external compensation for ceramic capacitor compatibility - deployed in TFT-LCD bias supplies and portable display power rails.

For engineers reviewing the ISL97519AIUZ-TK datasheet, ISL97519AIUZ-TK pinout, ISL97519AIUZ-TK application, or ISL97519AIUZ-TK equivalent, key selection criteria include input voltage headroom (2.3V min), output voltage programmability via FB divider, FSEL-driven frequency trade-offs between size and transient response, and MSOP-8 thermal performance under continuous 1A load.

Technical Context

The ISL97519AIUZ-TK uses current-mode PWM control with internal transconductance error amplifier (70–150 µS) and dual-cycle operation: during LX-on phase, energy stores in the inductor with VIN/L ramp rate; during LX-off phase, stored energy transfers to output via external Schottky diode. Its architecture supports stable regulation across 2.3V–5.5V input and 1.1×VIN to 25V output range.

Frequency selection is hardware-controlled via FSEL pin (GND = 620kHz, VDD = 1.25MHz), directly affecting inductor sizing and transient response. Soft-start is implemented via SS pin with 3µA constant-current charge, enabling linear current-limit ramp-up from 350mA (200mV) to full 2.0A limit (600mV), preventing inrush stress on output capacitors.

Key Specifications

Pinout & Package

ISL97519AIUZ-TK is housed in an 8-lead MSOP package (M8.118A) with 1.1mm max height, 0.65mm pitch, and exposed thermal pad (not electrically connected). The package supports JEDEC JESD51-7 thermal testing with θ_JA = 115°C/W on high-conductivity board.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ISL97519AIUZ-TK, TPS61088RHLR offers higher current headroom but sacrifices frequency selection and soft-start control, while MAX17062ETA+ simplifies bill-of-materials at the expense of output voltage ceiling and efficiency above 16V - making ISL97519AIUZ-TK optimal for tunable, high-VOUT TFT-LCD and portable display designs.

Availability

ISL97519AIUZ-TK is available at Aetrix Electronics and suitable for TFT-LCD display bias supplies, GSM/CDMA handset power management, and DSL modem line interface power requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for ISL97519AIUZ-TK 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

Intersil Corporation (now part of Renesas Electronics) is a U.S.-based analog and power management IC designer known for high-performance DC/DC converters, precision amplifiers, and interface solutions targeting portable and industrial markets.

The ISL97519AIUZ-TK belongs to Intersil's high-frequency boost regulator product line, engineered specifically for compact, high-efficiency power conversion in space- and battery-constrained portable displays and communication equipment.

FAQ

What is the maximum output voltage supported by the ISL97519AIUZ-TK?

The ISL97519AIUZ-TK supports output voltages up to 25V, limited by its absolute maximum LX-to-GND rating of 27V. This allows reliable operation for TFT-LCD gate drivers (e.g., 18V VGH) and LED flash circuits. Output is set via external resistor divider on the FB pin using the 1.24V internal reference; exceeding 25V risks permanent damage to the internal MOSFET.

How does the FSEL pin affect the ISL97519AIUZ-TK's performance in a real design?

The FSEL pin directly selects switching frequency: grounded for 620kHz (lower EMI, larger inductor), tied to VDD for 1.25MHz (smaller inductor, faster transient response). At 1.25MHz, a 4.7µH inductor suffices for 1A output, reducing solution size by ~40% versus 10µH at 620kHz - critical for slim handheld displays where board area is constrained.

Can the ISL97519AIUZ-TK operate from a single 2.5V Li-ion cell?

Yes - the ISL97519AIUZ-TK operates down to 2.3V input, making it compatible with discharged single-cell Li-ion (2.5V–3.0V) and Li-polymer batteries. At 2.5V input, it can still deliver 12V output with >85% efficiency (per Figure 1), supporting uninterrupted display operation during battery depletion without requiring intermediate buck-boost stages.

What is the role of the COMP pin in the ISL97519AIUZ-TK, and how is it configured?

The COMP pin is the output of the internal transconductance error amplifier and serves as the loop compensation node. A series RC network (e.g., 2.2kΩ + 4.7nF) from COMP to GND sets dominant pole and zero locations to stabilize the voltage loop. This external tuning allows optimization for different output capacitor types (ceramic vs. tantalum) and load transient profiles - essential for achieving <1% output deviation under 100mA–1A step loads.

Does the ISL97519AIUZ-TK require an external Schottky diode, and what are the key selection criteria?

Yes - the ISL97519AIUZ-TK requires an external Schottky diode connected between LX and VOUT. Key criteria: ≥2.0A average current rating (matching the IC's 2.0A switch limit), reverse breakdown voltage >25V (to handle max output), low forward voltage (<0.5V at 1A) to maintain >90% efficiency, and fast recovery (<50ns) to minimize switching losses. Diode leakage must be <10µA to avoid FB pin error.