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L6569A
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L6569A Benutzerreferenzhandbuch - ST Microelectronics

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L6569A Benutzerreferenzhandbuch

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1
FN9092.2
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.
ISL6569A
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.
(
o
C) 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.
Data Sheet December 29, 2004
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Verzeichnis

L6569A Datenblatt-PDF

L6569A Datenblatt PDF
ST Microelectronics
1 Seiten, 736 KB
L6569A Benutzerreferenzhandbuch
ST Microelectronics
22 Seiten, 552 KB
L6569A Notizdatei
ST Microelectronics
30 Seiten, 325 KB

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