ISL6442 Datasheet, PDF (1/16 Pages) Intersil Corporation – Dual (180° Out-of-Phase) PWM and Linear Controller

®
Data Sheet
October 31, 2008
ISL6442
FN9204.2
Dual (180° Out-of-Phase) PWM and Linear
Controller
The ISL6442 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 up to 2.5MHz provides
fast transient response and small external components. The
linear controller provides a low-current output.
The ISL6442 has voltage-tracking capability. Each 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 ISL6442 incorporates robust protection features. An
adjustable overcurrent protection circuit monitors the output
current by sensing the voltage drop across the upper
MOSFET r_DS(ON). Hiccup mode overcurrent operation
protects the DC/DC converters from damage under over
load 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.
Ordering Information
PART
NUMBER
(Note)
PART
TEMP.
PACKAGE PKG.
MARKING RANGE (°C) (Pb-free) DWG. #
ISL6442IAZ* ISL 6442IAZ -40 to +85 24 Ld QSOP M24.15
*Add “-TK” suffix for tape and reel. Please refer to TB347 for details
on reel specifications.
NOTE: These Intersil Pb-free plastic packaged products employ
special Pb-free material sets, molding compounds/die attach
materials, and 100% matte tin plate plus anneal (e3 termination
finish, which is 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.
Features
• 4.5V to 5.5V or 5.5V to 24V Input Voltage Range
• ±1.5% PWM Switcher Reference Accuracy Over Line and
Temperature
• Three Programmable Power Output Voltages
- Two PWM Controllers with Out-of-Phase Operation
- Voltage-Mode PWM Control
- One Linear Controller
• Programmable Switching Frequency from 300kHz to 2.5MHz
• Fast Transient Response
- High-Bandwidth Error Amplifier
• Extensive Circuit Protection Functions
- Overvoltage, Undervoltage, and Overtemperature
- Programmable Overcurrent Limit with Hiccup Mode
Operation
- 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
• 24 Ld QSOP
• Pb-Free (RoHS Compliant)
Applications
• Complete 1 Chip Solution for DSL Modems/Routers
• DSP, ASIC, and FPGA Point of Load Regulation
• ADSL, Broadband and Networking Applications
Pinout
ISL6442
(24 LD QSOP)
TOP VIEW
OCSET1 1
SS1/EN1 2
COMP1 3
FB1 4
RT 5
SGND 6
LCDR 7
LCFB 8
FB2 9
COMP2 10
SS2/EN2 11
OCSET2 12
24 VIN
23 BOOT1
22 UGATE1
21 PHASE1
20 LGATE1
19 VCC
18 PGND
17 LGATE2
16 PHASE2
15 UGATE2
14 BOOT2
13 PGOOD
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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