Renesas ISL9111HADJEV1Z

Overview

ISL9111HADJEV1Z from Intersil is an evaluation board for the ISL9111EHADJZ adjustable-output synchronous boost converter IC, designed to validate 2.5V–5.25V output operation from 0.8V–3.6V input in single/dual-cell battery systems. It supports up to 1A peak switch current, delivers >90% efficiency at light loads via skip mode (20µA quiescent current), and enables rapid prototyping of portable medical, USB-OTG, and Bluetooth headset power rails.

For engineers reviewing the ISL9111HADJEV1Z datasheet, ISL9111HADJEV1Z pinout, ISL9111HADJEV1Z application, or ISL9111HADJEV1Z equivalent, this page provides verified layout guidance, component selection criteria (4.7µH inductor, 4.7µF ceramic caps), fault monitoring behavior, thermal shutdown response, and fixed vs. adjustable output configuration validation - all critical for low-voltage battery-powered system integration.

Technical Context

The ISL9111HADJEV1Z implements a current-mode PWM control architecture with internal slope compensation and a 1.2MHz oscillator, enabling stable regulation across wide input/output voltage ratios. Its reference design uses external R1/R2 feedback resistors to set VOUT between 2.5V and 5.25V, with VFB = 800mV (±16mV) tolerance.

Board-level features include integrated overvoltage protection (5.9V OVP threshold on ADJ versions), thermal shutdown at +150°C (25°C hysteresis), and output disconnect during shutdown to prevent battery drain. Fault reporting is implemented via active-low FAULT pin tied to the ISL9111EHADJZ's dedicated fault monitor circuitry.

Key Specifications

Availability

ISL9111HADJEV1Z is available at Aetrix Electronics and suitable for portable HDMI transmitters, Bluetooth audio subsystems, and personal medical devices requiring stable component supply and rapid power architecture validation.

Supply support for ISL9111HADJEV1Z 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 is a leading provider of precision analog and power management solutions, now part of Renesas Electronics, with expertise in high-efficiency DC-DC conversion for battery-powered systems.

The ISL9111 product line was engineered specifically for ultra-low-input-voltage boost applications in portable consumer and medical electronics, emphasizing minimal external components and extended battery runtime.

FAQ

What is the primary function of the ISL9111HADJEV1Z evaluation board?

The ISL9111HADJEV1Z evaluation board is a fully assembled platform for validating the ISL9111EHADJZ adjustable-output synchronous boost converter. It demonstrates 2.5V–5.25V output generation from inputs as low as 0.8V, supports skip-mode efficiency optimization, and provides access to all critical signals (SW, EN, FB, FAULT, VIN, VOUT) for real-world testing of battery-powered applications.

Which IC does the ISL9111HADJEV1Z evaluate, and what are its key electrical limits?

The ISL9111HADJEV1Z evaluates the ISL9111EHADJZ IC, which features a 0.8V minimum startup voltage, 1.2MHz switching frequency, 1A peak switch current limit, 800mV feedback reference voltage (±16mV), and guaranteed operation from –20°C to +85°C ambient temperature. Its absolute maximum SW pin voltage is 8.0V for <10ns pulses.

How does the ISL9111HADJEV1Z support adjustable output voltage configuration?

The ISL9111HADJEV1Z implements the ISL9111EHADJZ's adjustable output mode using external R1/R2 feedback resistors per Equation 1 in the datasheet (VOUT = VFB × (1 + R1/R2)). The board includes test points and solder pads for resistor substitution, enabling precise VOUT tuning between 2.5V and 5.25V without modifying the IC itself.

What fault conditions does the ISL9111HADJEV1Z demonstrate, and how are they signaled?

The ISL9111HADJEV1Z demonstrates OVP (triggered at 5.9V), OTP (+150°C), short-circuit (VOUT < VIN), and undervoltage lockout (for ISL9111 variants). All faults drive the FAULT pin low; recovery requires either removal of the fault condition or full collapse of VIN/VOUT. This behavior is verified using the board's accessible FAULT test point and oscilloscope monitoring.

Can the ISL9111HADJEV1Z be used to evaluate fixed-output versions of the ISL9111 family?

No - the ISL9111HADJEV1Z is specifically configured for the ISL9111EHADJZ adjustable-output variant. Fixed-output versions (e.g., ISL9111EH33Z for 3.3V) use internal feedback dividers and lack the FB pin; they require dedicated evaluation boards like ISL9111H33EV1Z. Using ISL9111HADJEV1Z with fixed-output ICs would result in incorrect regulation or no output.