ISL8120_15 Datasheet, PDF (1/38 Pages) Intersil Corporation – Dual/n-Phase Buck PWM Controller with Integrated Drivers

DATASHEET
Dual/n-Phase Buck PWM Controller with Integrated
Drivers
ISL8120
The ISL8120 integrates two voltage-mode PWM leading-edge
modulation control with input feed-forward synchronous buck
PWM controllers to control a dual independent voltage
regulator 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 ISL8120 integrates an internal linear regulator, which
generates VCC from input rail for applications with only one
single supply rail. The internal oscillator is adjustable from
150kHz to 1.5MHz, and is able to synchronous 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 ISL8120’s Fault Hand Shake 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.
Related Literature
• Technical Brief TB389 “PCB Land Pattern Design and
Surface Mount Guidelines for QFN (MLFP) Packages”
Features
• Wide V_IN Range Operation: 3V to 22V
- VCC Operation from 3V to 5.60V
• Excellent Output Voltage Regulation: 0.6V ±0.6%/±0.9%
Internal Reference Over Commercial/Industrial Temperature
• Frequency Synchronization
• Programmable Phase Shift for 1-, 2-, 3-, 4-, 6-, up to 12-
-Phase Applications
• Fault Hand Shake 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
• DDR I and II Applications
• High Current Density Power Supplies
• Multiple Outputs VRM and VRD
Channels 1 and 2 Gate Drive
PVCC
PWMn
FAULT LOGIC
GATE
CONTROL
LOGIC
SHOOT-
THROUGH
PROTECTION
3Ω
BOOTn
UGATEn
10kΩ
PHASEn
10kΩ
LGATEn
February 9, 2015
FN6641.2
FIGURE 1. INTEGRATED DRIVER BLOCK DIAGRAM
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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