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Renesas Electronics Components Datasheet

ISL6446A Datasheet

Dual PWM and Linear Controller

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DATASHEET
ISL6446A
Dual (180°Out-of-Phase) PWM and Linear Controller
The ISL6446A 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 is 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
prebiased load.
The ISL6446A 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 shutdown circuitry
turns the device off if the IC temperature exceeds +150°C.
FN8384
Rev 3.00
Aug 27, 2015
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 prebiased load
• PGOOD output with delay
Applications
• ATX power supplies
• DSP, ASIC, and FPGA point-of-load regulation
• Industrial and security networking applications
FN8384 Rev 3.00
Aug 27, 2015
Page 1 of 22


Renesas Electronics Components Datasheet

ISL6446A Datasheet

Dual PWM and Linear Controller

No Preview Available !

ISL6446A
VOUT1
VOUT2
Feedback
and
Compensation
Network
R1
Feedback
and
Compensation
Network
R2
VCC VIN
CVCC
ROCSET1
VCC
COMP1
FB1
VIN
OCSET1 CBOOT1
BOOT1
UGATE1
VIN1 = VIN
COCSET1
CIN1
Q1
COMP2
FB2
PHASE1
LGATE1
L1
Q2
VOUT1
COUT1
ISL6446A
ROCSET2
OCSET2 CBOOT2
BOOT2
VIN2 = VIN
COCSET2
CIN2
PGOOD
RT
SS/EN1
SS/EN2
UGATE2
PHASE2
LGATE2
LCDR
LCFB
Q3
L2
Q4
VOUT2
COUT2
SGND PGND
FIGURE 1. TYPICAL APPLICATION
100
98
96
94
92
90 VOUT = 3.3V
VOUT = 5V
88
86
84
82
80 0 5 10 15 20
LOAD CURRENT (A)
FIGURE 2. EFFICIENCY vs LOAD CURRENT (OBTAINED FROM
ISL6446AEVAL1Z)
25
FN8384 Rev 3.00
Aug 27, 2015
Page 2 of 22


Part Number ISL6446A
Description Dual PWM and Linear Controller
Maker Renesas
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ISL6446A Datasheet PDF






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