ISL8126 Datasheet, PDF (1/39 Pages) Intersil Corporation – Dual/n-Phase Buck PWM Controller with Integrated Drivers

Dual/n-Phase Buck PWM Controller with Integrated
Drivers
ISL8126
The ISL8126 integrates two voltage-mode PWM leading-edge
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.
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-, 12- phases with desired interleaving
phase shift.
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.
Table 1 summarizes the differences between ISL8126 and
ISL8126A.
TABLE 1.
DEVICES
ISL8126
ISL8126A
REFERENCE VOLTAGE
(V)
0.6
0.7
VSEN1+ to VSEN1- INPUT
IMPEDANCE
500kΩ
>2MΩ
Features
• Wide V_IN 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
• Fault Spreading Capability for High System Reliability
• Digital Soft-Start with Pre-Charged 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
Applications
• Power Supply for Datacom/Telecom and POL
• Paralleling Power Module
• Wide and Narrow Input Voltage Range Buck Regulators
Related Literature
• Technical Brief TB389 “PCB Land Pattern Design and
Surface Mount Guidelines for QFN Packages”
September 7, 2011
1
FN7892.0
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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