ISL6444CA datasheet, PDF - EEWORLD Datasheet

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ISL6444CA: DescriptionDual Switching Controller; CategoryPower/power management The power supply circuit; File Size873KB，19 Pages; ManufacturerRenesas Electronics Corporation; Websitehttps://www.renesas.com/

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ISL6444CA Overview

Dual Switching Controller

ISL6444CA Parametric

Parameter Name	Attribute value
Maker	Renesas Electronics Corporation
package instruction	SSOP,
Reach Compliance Code	compliant
Analog Integrated Circuits - Other Types	DUAL SWITCHING CONTROLLER
control mode	CURRENT-MODE
Control Technology	PULSE WIDTH MODULATION
Maximum input voltage	24 V
Minimum input voltage	5 V
Nominal input voltage	16 V
JESD-30 code	R-PDSO-G28
length	9.905 mm
Number of functions	1
Number of terminals	28
Maximum operating temperature	85 °C
Minimum operating temperature	-10 °C
Package body material	PLASTIC/EPOXY
encapsulated code	SSOP
Package shape	RECTANGULAR
Package form	SMALL OUTLINE, SHRINK PITCH
Maximum seat height	1.75 mm
surface mount	YES
Switch configuration	BUCK
Maximum switching frequency	300 kHz
Temperature level	OTHER
Terminal form	GULL WING
Terminal pitch	0.635 mm
Terminal location	DUAL
width	3.895 mm

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ISL6444

NOT RECOMMENDED FOR NEW DESIGNS

NO RECOMMENDED REPLACEMENT

contact our Technical Support Center at

1-888-INTERSIL or www.intersil.com/tsc

DATASHEET

FN9069

Rev 3.00

Apr 12, 2007

Dual PWM Controller with DDR Memory Option for Gateway Applications

The ISL6444 PWM controller provides high efficiency and

regulation for two output voltages adjustable in the range from

0.9V to 5.5V that are required to power I/O, chip-sets, and

memory banks in high-performance notebook computers,

PDAs, and Internet appliances.

Synchronous rectification and hysteretic operation at light

loads contribute to a high efficiency over a wide range of

loads. The hysteretic mode of operation can be disabled

separately on each PWM converter if continuous conduction

operation is desired for all load levels. Efficiency is even

further enhanced by using MOSFET’s r

DS(ON)

as a current

sense component.

Feed-forward ramp modulation, current mode control

scheme, and internal feed-back compensation provide fast

response to load transients. Out-of-phase operation with a

180

phase shift reduces the input current ripple.

The controller can be transformed in a complete DDR

memory power supply solution by activating a DDR pin. In

DDR mode of operation one of the channels tracks the

output voltage of another channel and provides output

current sink and source capability–features essential for

proper powering of DDR chips. The buffered reference

voltage required by this type of memory is also provided.

The ISL6444 monitors the output voltages. Each PWM

controller generates a PGOOD (power good) signal when

the soft-start is completed and the output is within ±10% of

the set point.

A built-in overvoltage protection prevents output voltage

from going above 115% of the set point. Normal operation

automatically restores when the overvoltage conditions go

away. Undervoltage protection latches the chip off when

either output drops below 75% of its set value after the

soft-start sequence for this output is completed. An

adjustable overcurrent function monitors the output current

by sensing the voltage drop across the lower MOSFET. If

precision current-sensing is required, an external current-

sense resistor may optionally be used.

The IC comes in a 28 Ld SSOP package.

Features

• Provides regulated output voltage in the range 0.9V to 5.5V

- High efficiency over wide load range

- Synchronous buck converter with hysteretic operation at

light load

• Complete DDR memory power solution

- VTT tracks VDDQ/2

- VDDQ/2 buffered reference output

• No current-sense resistor required

- Uses MOSFET’s r

DS(ON)

- Optional current-sense resistor for precision overcurrent

• Undervoltage lock-out on VCC pin

• Dual mode operation

- Operates directly from battery 5.0V to 24V input

- Operates from 3.3V or 5V system rail

• Excellent dynamic response

- Combined voltage feed-forward and current mode

control

• Power-good signal for each channel

• 300kHz switching frequency

- Out-of-phase operation for reduced input ripple

- In-phase operation in DDR mode for reduced channel

interference

- Out-of-phase operation with 90° phase shift for

two-stage conversion in DDR mode

• Pb-free plus anneal available (RoHS compliant)

Applications

• Residential and Enterprise Gateways

• DSL Modems

• Routers and Switchers

Ordering Information

PART

NUMBER

ISL6444CA*

PART

MARKING

ISL 6444CA

TEMP.

RANGE

(°C)

PACKAGE

PKG.

DWG. #

-10 to +85 28 Ld QSOP M28.15

ISL6444CAZ* ISL 6444CAZ -10 to +85 28 Ld QSOP M28.15

(Note)

(Pb-free)

*Add “-T” suffix for tape and reel.

NOTE: Intersil Pb-free plus anneal products employ special Pb-free

material sets; molding compounds/die attach materials and 100%

matte tin plate termination finish, which are 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.

FN9069 Rev 3.00

Apr 12, 2007

Page 1 of 19

ISL6444CA Related Products

	ISL6444CA	ISL6444CAZ	ISL6444CA-T	ISL6444CAZ-T
Description	Dual Switching Controller	PWM Controller with DDR Memory Option for Gateway Applications; QSOP28; Temp Range: 0° to 70°	DUAL SWITCHING CONTROLLER, 345kHz SWITCHING FREQ-MAX, PDSO28, 0.150 INCH, PLASTIC, QSOP-28	PWM Controller with DDR Memory Option for Gateway Applications; QSOP28; Temp Range: 0° to 70°
Maker	Renesas Electronics Corporation	Renesas Electronics Corporation	Renesas Electronics Corporation	Renesas Electronics Corporation
package instruction	SSOP,	SSOP, SSOP28,.25	QSOP-28	SSOP, SSOP28,.25
Reach Compliance Code	compliant	compliant	not_compliant	compli
Analog Integrated Circuits - Other Types	DUAL SWITCHING CONTROLLER	DUAL SWITCHING CONTROLLER	DUAL SWITCHING CONTROLLER	DUAL SWITCHING CONTROLLER
control mode	CURRENT-MODE	CURRENT-MODE	CURRENT-MODE	CURRENT-MODE
Control Technology	PULSE WIDTH MODULATION	PULSE WIDTH MODULATION	PULSE WIDTH MODULATION	PULSE WIDTH MODULATION
Maximum input voltage	24 V	5.25 V	5.25 V	5.25 V
Minimum input voltage	5 V	4.75 V	4.75 V	4.75 V
Nominal input voltage	16 V	5 V	5 V	5 V
JESD-30 code	R-PDSO-G28	R-PDSO-G28	R-PDSO-G28	R-PDSO-G28
length	9.905 mm	9.905 mm	9.905 mm	9.905 mm
Number of functions	1	1	1	1
Number of terminals	28	28	28	28
Maximum operating temperature	85 °C	85 °C	85 °C	85 °C
Minimum operating temperature	-10 °C	-10 °C	-10 °C	-10 °C
Package body material	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY
encapsulated code	SSOP	SSOP	SSOP	SSOP
Package shape	RECTANGULAR	RECTANGULAR	RECTANGULAR	RECTANGULAR
Package form	SMALL OUTLINE, SHRINK PITCH	SMALL OUTLINE, SHRINK PITCH	SMALL OUTLINE, SHRINK PITCH	SMALL OUTLINE, SHRINK PITCH
Maximum seat height	1.75 mm	1.75 mm	1.75 mm	1.75 mm
surface mount	YES	YES	YES	YES
Switch configuration	BUCK	PUSH-PULL	PUSH-PULL	PUSH-PULL
Maximum switching frequency	300 kHz	345 kHz	345 kHz	345 kHz
Temperature level	OTHER	COMMERCIAL EXTENDED	COMMERCIAL EXTENDED	COMMERCIAL EXTENDED
Terminal form	GULL WING	GULL WING	GULL WING	GULL WING
Terminal pitch	0.635 mm	0.635 mm	0.635 mm	0.635 mm
Terminal location	DUAL	DUAL	DUAL	DUAL
width	3.895 mm	3.895 mm	3.895 mm	3.895 mm
Is it Rohs certified?	-	conform to	incompatible	conform to
Parts packaging code	-	QSOP	SOIC	QSOP
Contacts	-	28	28	28
ECCN code	-	EAR99	EAR99	EAR99
JESD-609 code	-	e3	e0	e3
Humidity sensitivity level	-	2	1	2
Encapsulate equivalent code	-	SSOP28,.25	SSOP28,.25	SSOP28,.25
Peak Reflow Temperature (Celsius)	-	260	240	260
Certification status	-	Not Qualified	Not Qualified	Not Qualified
Terminal surface	-	Matte Tin (Sn) - annealed	Tin/Lead (Sn/Pb)	Matte Tin (Sn) - annealed
Maximum time at peak reflow temperature	-	30	30	40

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