Want to post a buying lead? If you are not a member yet, please select the specific/related part number first and then fill the quantity and your contact details in the "Request for Quotation Form" on the left, and then click "Send RFQ".Your buying lead can then be posted, and the reliable suppliers will quote via our online message system or other channels soon.
T he ISL6440 is a high-performance, dual-output PWM controller optimized for converting wall adapter, battery or network intermediate bus DC in put supplies into the system supply voltages required for a wide variety of applications. Each output is adjustable down to 0.8V. The two PWMs are synchronized 180 o out of phase reducing the RMS input current and ripple voltage.
The ISL6440 incorporates seve ral protection features. An adjustable overcurrent protection circuit monitors the output current by sensing the voltage drop across the lower MOSFET. Hiccup mode overcurr ent operation protects the DC/DC components from damage during output overload/short circuit conditions. Each PWM has an independent logic-level shutdown input (SD1 and SD2).
A single PGOOD signal is issued when soft-start is complete on both PWM controllers and their outputs are within 10% of the set point. Thermal shutdown circuitry turns off the device if the junction temperature exceeds +150°C.
•Wide Input Supply Voltage Range -5.6V to 24V -4.5V to 5.6V •Two Independently Programmable Output Voltages •Switching Frequency . . . . . . . . . . . . . . . . . . . . . . .300kHz •Out of Phase PWM Controller Operation -Reduces Required Input Capacitance and Power Supply Induced Loads •No External Current Sense Resistor -Uses Lower MOSFET's r DS(ON) •Programmable Soft-Start •Extensive Circuit Protection Functions -PGOOD -UVLO -Overcurrent -Overtemperature -Independent Shutdown for Both PWMs •Excellent Dynamic Response -Voltage Feed-Forward with Current Mode Control •Pb-Free Plus Anneal Available (RoHS Compliant)
ISL6440IAZ Typical Application
•Power Supplies with Two Outputs •xDSL Modems/Routers •DSP, ASIC, and FPGA Power Supplies •Set-Top Boxes •Dual Output Supplies for DSP, Memory, Logic, µP Core and I/O •Telecom Systems
ISL6440IAZ Connection Diagram
ISL6440IAZ-T Parameters
Technical/Catalog Information
ISL6440IAZ-T
Vendor
Intersil (VA)
Category
Integrated Circuits (ICs)
PWM Type
Current Mode
Number of Outputs
2
Package / Case
24-QSOP
Packaging
Digi-Reel?
Duty Cycle
93%
Voltage - Supply
4.5 V ~ 27 V
Frequency-Max
340kHz
Buck
Yes
Boost
No
Flyback
No
Inverting
No
Doubler
No
Divider
No
Cuk
No
Isolated
No
Drawing Number
*
Operating Temperature
-40°C ~ 85°C
Lead Free Status
Lead Free
RoHS Status
RoHS Compliant
Other Names
ISL6440IAZ T ISL6440IAZT ISL6440IAZ TDKR ND ISL6440IAZTDKRND ISL6440IAZ-TDKR
ISL6440IAZ-T General Description
The ISL6440IAZ-T is one member of the ISL6440 family which designed as the high-performance, dual-output PWM controller that optimized for converting wall adapter, battery or network intermediate bus DC input supplies into the system supply voltages required for a wide variety of applications such as: (1)power supplies with two outputs; (2)xDSL modems/routers; (3)DSP, ASIC, and FPGA power supplies; (4)set-top boxes; (5)dual output supplies for DSP, memory, logic, uP core and I/O; (6)telecom systems. This device has the control circuits for two synchronous buck converters.
Features of the ISL6440IAZ-T are:(1)Pb-free plus anneal available (RoHS compliant);(2)excellent dynamic response--voltage feed-forward with current mode control;(3)extensive circuit protection functions such as PGOOD, UVLO, overcurrent, overtemperature and independent shutdown for both PWMs;(4)progra-mmable soft-start;(5)no external current sense resistor;(6)out of phase PWM controller operation;(7)switching frequency:300 kHz;(8)two independently programmable output voltages;(9)wide input supply voltage range:5.6V to 24V and 4.5V to 5.6V.
The absolute maximum ratings of the ISL6440IAZ-T can be summarized as:(1)supply voltage (Vcc_5V pin):-0.3V to +7V;(2)input voltage (VIN pin):+27V;(3)BOOT1, 2 and UGATE1, 2:+35V;(4)PHASE1, 2 and ISEN1, 2:+27V;(5)BOOT1, 2 with respect to PHASE1, 2:+6.5V;(6)temperature range:-40°C to 85°C;(7)maximum lead temperature (soldering 10s):300°C;(8)maximum storage temperature range:-65°C to 150°C;(9)maximum junction temperature (plastic package):-55°C to 150°C. If you want to know more information such as the electrical characteristics about the ISL6440IAZ-T, please download the datasheet in www.seekic.com or www.chinaicmart.com .
