ISL6558 Datasheet, PDF (1/16 Pages) Intersil Corporation – Multi-Purpose Precision Multi-Phase PWM Controller With Optional Active Voltage Positioning

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Data Sheet
June 21, 2005
ISL6558
FN9027.12
Multi-Purpose Precision Multi-Phase PWM
Controller With Optional Active Voltage
Positioning
The ISL6558 is a multi-phase PWM controller, which in
combination with the HIP6601B, HIP6602B, HIP6603B, or
ISL6605 companion gate drivers form a complete solution
for high-current, high slew-rate applications. The ISL6558
regulates output voltage, balances load currents and
provides protective functions for two to four synchronous
rectified buck converter channels.
A novel approach to current sensing is used to reduce
overall solution cost and improve efficiency. The voltage
developed across the lower MOSFET during conduction is
sampled and fed back to the controller. This lossless
current-sensing approach enables the controller to maintain
phase-current balance between the power channels, provide
overcurrent protection, and permit droop compensation.
Optional output voltage “droop” or active voltage positioning
is supported via the DROOP pin. Taking advantage of this
feature reduces the size and cost of the output capacitors
required to support a load transient.
In the event of an overvoltage, the controller monitors and
responds to reduce the risk of damage to load devices.
Undervoltage conditions are indicated through a PGOOD
transition. Overcurrent conditions cause the converter to
shutdown limiting the exposure of load devices. These
integrated monitoring and protection features provide a safe
environment for microprocessors and other advanced low
voltage circuits.
Features
• Pb-Free Plus Anneal Available (RoHS Compliant)
• Multi-Phase Power Conversion
- 2-, 3-, or 4-Phase Operation
• Optional Output Voltage Droop
• Precision Channel-Current Balance
• Lossless Current Sensing
• Precision Reference Voltage
- 0.8V ± 1.5% Over -40°C - 85°C Range
- 0. 8V ± 1.0% Over 0°C - 70°C Range
• Fast Transient Response
• Overcurrent and Overvoltage Protection
• Digital Soft-start
• Power Good Indication
• High Ripple Frequency (80kHz to 1.5MHz)
• QFN Package
- Compliant to JEDEC PUB95 MO-220 QFN-Quad Flat
No Leads-Product Outline
- Near Chip-Scale Package Footprint; Improves PCB
Efficiency and Thinner in Profile
Applications
• Power Supply Control for Microprocessors
• Low Output Voltage, High Current DC-DC Converters
• Voltage Regulator Modules
• Servers and Workstations
• Memory and Accelerated Graphics Port Supplies
• Communication Processor and Personal Computer
Peripherals
Pinouts
ISL6558 (16 LEAD SOIC)
TOP VIEW
ISL6558 (20 LEAD 5X5 QFN)
TOP VIEW
V_CC 1
PGOOD 2
COMP 3
DROOP 4
FB 5
VSEN 6
FS/EN 7
GND 8
16 PWM4
15 ISEN4
14 ISEN1 COMP 1
13 PWM1
12 PWM2
N/C 2
11 ISEN2 _{DROOP 3}
10 ISEN3
9 PWM3
FB 4
VSEN 5
20 19 18 17 16
15 ISEN1
14 PWM1
13 PWM2
12 ISEN2
11 ISEN3
6 7 8 9 10
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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