• Description

ISL6843IBZ-T Boost Flyback Regulator Positive Isolation Capable Output Step-Up DC-DC Controller IC

The ISL6840, ISL6841, ISL6842, ISL6843, and ISL6844 (ISL684x) family of adjustable frequency, low power, Pulse-Width Modulating (PWM) current mode controllers is designed for a wide range of power conversion applications including boost, flyback, and isolated output configurations. Peak current mode control effectively handles power transients and provides inherent overcurrent protection.

This advanced BiCMOS design is pin-compatible with the industry standard 384x family of controllers and offers significantly improved performance. Features include low operating current, 60µA start-up current, adjustable operating frequency to 2MHz, and high peak current drive capability with 20ns rise and fall times.



• 1A MOSFET gate driver

• 60µA start-up current, 100µA maximum

• 25ns propagation delay current sense to output

• Fast transient response with peak current mode control

• Adjustable switching frequency to 2MHz

• 20ns rise and fall times with 1nF output load

• Trimmed timing capacitor discharge current for accurate deadtime/maximum duty cycle control

• High bandwidth error amplifier

• Tight tolerance voltage reference over line, load, and temperature

• Tight tolerance current limit threshold

• Pb-free available (RoHS compliant)



• Telecom and datacom power

• Wireless base station power

• File server power

• Industrial power systems

• PC power supplies

• Isolated buck and flyback regulators

• Boost regulators


Specification of ISL6843IBZ-T


Renesas Electronics America Inc

Output Type

Transistor Driver


Step-Up, Step-Up/Step-Down

Output Configuration

Positive, Isolation Capable


Boost, Flyback

Number of Outputs


Output Phases


Voltage - Supply (Vcc/Vdd)

9V ~ 16V

Frequency - Switching

Up to 2MHz

Duty Cycle (Max)


Synchronous Rectifier


Clock Sync


Control Features

Current Limit, Frequency Control

Operating Temperature

-40°C ~ 105°C (TA)

Mounting Type

Surface Mount

Package / Case

8-SOIC (0.154", 3.90mm Width)

Supplier Device Package


Go To Top