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ISL6446IAZ-TK Datasheet(PDF) 1 Page - Intersil Corporation

Part # ISL6446IAZ-TK
Description  Dual (180째 Out-of-Phase) PWM and Linear Controller
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Manufacturer  INTERSIL [Intersil Corporation]
Direct Link  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

ISL6446IAZ-TK Datasheet(HTML) 1 Page - Intersil Corporation

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Dual (180° Out-of-Phase) PWM and Linear Controller
ISL6446
The ISL6446 is a high-performance, triple output controller
that provides a single high-frequency power solution primarily
for Broadband, DSL and Networking applications. This device
integrates complete control, monitoring and protection
functions for two synchronous buck PWM controllers and one
linear controller. Input voltage ripple and total RMS input
current is substantially reduced by synchronized 180°
out-of-phase operation of the two PWMs.
The two PWM buck converters provide simple voltage mode
control. The output voltage of the converters can be precisely
regulated to as low as 0.6V, with a maximum tolerance of
±1.5% over-temperature and line variations. Programmable
switching frequency down to 100kHz provides optimized low
cost solution for ATX power supplies. It’s also able to operate
up to 2.5MHz to deliver compact solutions. The linear
controller provides a low-current output.
Each PWM controller has soft-start and independent enable
functions combined on a single pin. A capacitor from SS/EN to
ground sets the soft-start time; pulling SS/EN pin below 1V
disables the controller. Both outputs can soft-start into a
pre-biased load.
The ISL6446 incorporates robust protection features. An
adjustable overcurrent protection circuit monitors the output
current by sensing the voltage drop across the upper MOSFET
rDS(ON). Latch-off mode overcurrent operation protects the
DC/DC converters from damage under overload and short
circuit conditions. A PGOOD signal is issued when soft-start is
complete and PWM outputs are within 10% of their regulated
values and the linear regulator output is higher than 75% of its
nominal value. Thermal shut-down circuitry turns the device off
if the IC temperature exceeds +150°C.
Features
• 4.5V to 5.5V or 5.5V to 24V input voltage range
• Three programmable power output voltages
- Two PWM controllers with out-of-phase operation
- Voltage-mode PWM control
- One linear controller
• Programmable switching frequency from 100kHz to 2.5MHz
• Fast transient response
- High-bandwidth error amplifier
•Extensive circuit protection functions
- Undervoltage, and over-temperature
- Overvoltage with latch-off mode
- Programmable overcurrent limit with latch-off mode
- Lossless current sensing (no sense resistor needed)
• Externally adjustable soft-start time
- Independent enable control
- Voltage tracking capability
- Able to soft-start into a pre-biased load
• PGOOD output with delay
Applications
• ATX power supplies
• DSP, ASIC, and FPGA point of load regulation
• Industrial and security networking applications
FIGURE 1. TYPICAL APPLICATION
FIGURE 2. EFFICIENCY vs LOAD CURRENT (OBTAINED FROM
ISL6446EVAL1Z)
BOOT1
UGATE1
LCDR
LCFB
COMP1
FB1
SGND
LGATE1
PGND
VIN1 = VIN
BOOT2
UGATE2
LGATE2
VIN
VCC
VIN
SS1/EN1
SS2/EN2
PGOOD
RT
VOUT1
VOUT1
VCC
VOUT2
FB2
COMP2
ISL6446
OCSET1
PHASE1
OCSET2
PHASE2
Feedback
R2
R1
ROCSET1
CVCC
COCSET1
CBOOT1
L1
CIN1
COUT1
Q1
Q2
VIN2 = VIN
VOUT2
COCSET2
CBOOT2
L2
CIN2
COUT2
Q3
Q4
ROCSET2
and
Compensation
Network
Feedback
and
Compensation
Network
80
82
84
86
88
90
92
94
96
98
100
0
5
10
15
20
25
LOAD CURRENT (A)
VOUT = 5V
VOUT = 3.3V
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774
| Copyright Intersil Americas LLC 2012, 2013. All Rights Reserved
Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.
October 15, 2013
FN7944.1


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