Datasheet > ISL8126

ISL8126

更新时间： 2023-12-20 18:46:25

品牌	Logo	应用领域
瑞萨 - RENESAS		/
页数	文件大小	规格书
39页	1931K
描述
Dual/n-Phase Buck PWM Controller with Integrated Drivers

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ISL8126 数据手册

DATASHEET

ISL8126

FN7892

Rev.2.00

January 29, 2015

Dual/n-Phase Buck PWM Controller with Integrated Drivers

The ISL8126 integrates two voltage-mode PWM leading-edge

Features

modulation control with input feed-forward synchronous buck

PWM controllers to control dual independent voltage

regulators or a 2-phase single output regulator. It also

integrates current sharing control for the power module to

operate in parallel, which offers high system flexibility.

• Wide V range operation: 3V to 26.5V

- VCC operation from 3V to 5.60V

• Excellent output voltage regulation: 0.6V internal reference

• Frequency synchronization with programmable phase delay

up to 12-phase applications

The ISL8126 integrates an internal linear regulator, which

generates IC’s bias voltages for applications with only one

single supply rail. The internal oscillator is adjustable from

150kHz to 1.5MHz, and is able to synchronize to an external

clock signal for frequency synchronization and phase

paralleling applications. Its PLL circuit can output a

phase-shift-programmable clock signal for the system to be

expanded to 3-, 4-, 6- and 12- phases with desired interleaving

phase shift.

• Fault spreading capability for high system reliability

• Digital soft-start with precharged output start-up capability

• Dual independent channel enable inputs with precision

voltage monitor and voltage feed-forward capability

- Programmable input voltage POR and its hysteresis with a

resistor divider at EN input

• Extensive circuit protection functions: output overvoltage,

undervoltage, overcurrent protection, over-temperature and

pre-power-on-reset overvoltage protection option

The ISL8126’s Fault Spreading feature protects any channel

from overloading/stressing due to system faults or phase

failure. The undervoltage fault protection features are also

designed to prevent a negative transient on the output voltage

during falling down. This eliminates the Schottky diode that is

used in some systems for protecting the load device from

reversed output voltage damage.

Applications

• Power supply for Datacom/Telecom and POL

• Paralleling power module

• Wide and narrow input voltage range buck regulators

Related Literature

• TB389 “PCB Land Pattern Design and Surface Mount

Guidelines for QFN Packages”

• AN1713, “ISL8126EVAL1Z Evaluation Board User Guide”

0^o

VO1

VIN

0^o

90^o

VO2

180^o

270^o

DUAL REGULATOR

TWO-PHASE REGULATOR

FOUR-PHASE REGULATOR

FIGURE 1. TYPICAL APPLICATION DIAGRAM

FN7892 Rev.2.00

January 29, 2015

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