ISL6569A Datasheet, PDF (1/22 Pages) Intersil Corporation – Multi-Phase PWM Controller

®
Data Sheet
December 29, 2004
ISL6569A
FN9092.2
Multi-Phase PWM Controller
The ISL6569A provides core-voltage regulation by driving
two interleaved synchronous-rectified buck-converter
channels in parallel. Interleaving the channel timing results
in increased ripple frequency which reduces input and output
ripple currents. The reduction in ripple results in lower
component cost, reduced dissipation, and a smaller
implementation area.
The ISL6569A uses cost and space-saving r_DS(ON) sensing
for channel current balance, active voltage positioning, and
over-current protection. Output voltage is monitored by an
internal differential remote sense amplifier. A high-bandwidth
error amplifier drives the output voltage to match the
programmed 5-bit DAC reference voltage. The resulting
compensation signal guides the creation of pulse width
modulated (PWM) signals to control companion Intersil
MOSFET drivers. The OFS pin allows direct offset of the
DAC voltage from 0V to 50mV using a single external
resistor. The reference and amplifiers are trimmed to ensure
a system accuracy of ±0.5% over temperature.
Outstanding features of this controller IC include
Dynamic VID^TM technology allowing seamless on-the-fly VID
changing without the need of any external components.
Output voltage “droop” or active voltage positioning is
optional. When employed, it allows the reduction in size and
cost of the output capacitors required to support load
transients. A threshold-sensitive enable input allows the use
of an external resistor divider for start-up coordination with
Intersil MOSFET drivers or any other devices powered from
a separate supply.
Superior over-voltage protection is achieved by gating on the
lower MOSFET of all phases to crowbar the output voltage.
An optional second crowbar on V_IN, formed with an external
MOSFET or SCR gated by the OVP pin, is triggered when
an over-voltage condition is detected. Under-voltage
conditions are detected, but PWM operation is not disrupted.
Over-current conditions cause a hiccup-mode response as
the controller repeatedly tries to restart. After a set number
of failed startup attempts, the controller latches off. A power
good logic signal indicates when the converter output is
between the UV and OV thresholds.
Features
• Multi-Phase Power Conversion
- 2 Phase Operation
• Active Channel Current Balancing
• Precision r_DS(ON) Current Sharing
- Lossless
- Low Cost
• Input Voltage: 12V or 5V Bias
• Precision CORE Voltage Regulation
- ± 0.5% System Accuracy Over Temperature
- Differential Remote Output Voltage Sensing
- Programmable Reference Offset
• Microprocessor Voltage Identification Input
- 5-Bit VID Input
- 0.800V to 1.550V in 25mV Steps
- Dynamic VID^TM Technology
• Programmable Droop Voltage
• Fast Transient Recovery Time
• Over Current Protection
• Digital Soft Start
• Threshold Sensitive Enable Input
• High Ripple Frequency (160kHz to 2MHz)
• QFN Package:
- Compliant to JEDEC PUB95 MO-220
QFN - Quad Flat No Leads - Package Outline
- Near Chip Scale Package footprint, which improves
PCB efficiency and has a thinner profile
• Pb-Free Available (RoHS Compliant)
Applications
• AMD Hammer Family Processor Voltage Regulator
• Low Output Voltage, High Current DC-DC Converters
• Voltage Regulator Modules
Ordering Information
PART NUMBER
TEMP.
(^oC)
PACKAGE
PKG.
DWG. #
ISL6569ACB
0 to 70 24 Ld SOIC
M24.3
ISL6569ACBZ (Note) 0 to 70 24 Ld SOIC (Pb-free) M24.3
ISL6569ACR
0 to 85 32 Ld 5x5 QFN
L32.5x5
ISL6569ACRZ (Note) 0 to 85 32 Ld 5x5 QFN (Pb-free) L32.5x5
Add “-T” suffix for tape and reel.
NOTE: Intersil Pb-free products employ special Pb-free material sets; molding
compounds/die attach materials and 100% matte tin plate termination finish, which are
RoHS compliant and compatible with both SnPb and Pb-free soldering operations.
Intersil Pb-free products are MSL classified at Pb-free peak reflow temperatures that
meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020.
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright © Intersil Americas Inc. 2003, 2004. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.