ISL6236
®
Data Sheet
April 29, 2010
High-Efficiency, Quad-Output, Main Power
Supply Controllers for Notebook
Computers
The ISL6236 dual step-down, switch-mode power-supply
(SMPS) controller generates logic-supply voltages in
battery-powered systems. The ISL6236 include two
pulse-width modulation (PWM) controllers, 5V/3.3V and
1.5V/1.05V. The output of SMPS1 can also be adjusted from
0.7V to 5.5V. The SMPS2 output can be adjusted from 0V to
2.5V by setting REFIN2 voltage. An optional external charge
pump can be monitored through SECFB. This device features
a linear regulator providing 3.3V/5V, or adjustable from 0.7V to
4.5V output via LDOREFIN. The linear regulator provides up
to 100mA output current with automatic linear-regulator
bootstrapping to the BYP input. When in switchover, the LDO
output can source up to 200mA. The ISL6236 includes
on-board power-up sequencing, the power-good (POK)
outputs, digital soft-start, and internal soft-stop output
discharge that prevents negative voltages on shutdown.
A constant ON-time PWM control scheme operates without
sense resistors and provides 100ns response to load
transients while maintaining a relatively constant switching
frequency. The unique ultrasonic pulse-skipping mode
maintains the switching frequency above 25kHz, which
eliminates noise in audio applications. Other features include
pulse skipping, which maximizes efficiency in light-load
applications, and fixed-frequency PWM mode, which reduces
RF interference in sensitive applications.
Ordering Information
PART
NUMBER
(Note)
ISL6236IRZA
PART
MARKING
TEMP.
RANGE
(°C)
FN6373.6
Features
• Wide Input Voltage Range 5.5V to 25V
• Dual Fixed 1.05V/3.3V and 1.5V/5.0V Outputs or
Adjustable 0.7V to 5.5V (SMPS1) and 0V to 2.5V
(SMPS2), ±1.5% Accuracy
• Secondary Feedback Input (Maintains Charge Pump
Voltage)
• 1.7ms Digital Soft-Start and Independent Shutdown
• Fixed 3.3V/5.0V, or Adjustable Output 0.7V to 4.5V,
±1.5% (LDO): 200mA
• 3.3V Reference Voltage ±2.0%: 5mA
• 2.0V Reference Voltage ±1.0%: 50µA
• Constant ON-time Control with 100ns Load-Step
Response
• Frequency Selectable
• rDS(ON) Current Sensing
• Programmable Current Limit with Foldback Capability
• Selectable PWM, Skip or Ultrasonic Mode
• BOOT Voltage Monitor with Automatic Refresh
• Independent POK1 and POK2 Comparators
• Soft-Start with Pre-Biased Output and Soft-Stop
• Independent ENABLE
• High Efficiency - up to 97%
• Very High Light Load Efficiency (Skip Mode)
PACKAGE
(Pb-Free)
PKG.
DWG. #
ISL6236 IRZ -40 to +100 32 Ld 5x5 QFN L32.5x5B
ISL6236IRZA-T* ISL6236 IRZ -40 to +100 32 Ld 5x5 QFN L32.5x5B
(Tape and
Reel)
*Please refer to TB347 for details on reel specifications.
• 5mW Quiescent Power Dissipation
• Thermal Shutdown
• Extremely Low Component Count
• Pb-Free (RoHS Compliant)
Applications
• Notebook and Sub-Notebook Computers
NOTES:
1. 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 Pbfree requirements of IPC/JEDEC J STD-020.
• PDAs and Mobile Communication Devices
2. For Moisture Sensitivity Level (MSL), please see device
information page for ISL6236. For more information on
MSL please see techbrief TB363.
• Game Consoles
1
• 3-Cell and 4-Cell Li+ Battery-Powered Devices
• DDR1, DDR2 and DDR3 Power Supplies
• Graphic Cards
• Telecommunications
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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