Datasheet > ISL6444CA-T

ISL6444CA-T

更新时间： 2024-11-24 22:55:35

品牌	Logo	应用领域
英特矽尔 - INTERSIL		开关光电二极管栅双倍数据速率控制器
页数	文件大小	规格书
18页	438K
描述
Dual PWM Controller with DDR Memory Option for Gateway Applications

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ISL6444CA-T 数据手册

ISL6444

Data Sheet

May 2002

FN9069.1

Dual PWM Controller with DDR Memory

Option for Gateway Applications

Features

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

- High efficiency over wide load range

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 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

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

- Uses MOSFET’s R

DS(ON)

- Optional current-sense resistor for precision overcurrent

• Undervoltage lock-out on VCC pin

• Dual mode operation

further enhanced by using MOSFET’s R

sense component.

as a current

DS(ON)

- Operates directly from battery 5.0-24V input

- Operates from 3.3V or 5V system rail

• Excellent dynamic response

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^ophase shift reduces the input current ripple.

- Combined voltage feed-forward and current mode

control

• Power-good signal for each channel

• 300kHz switching frequency

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.

- Out-of-phase operation for reduced input ripple

- In-phase operation in DDR mode for reduced channel

interference

- Out-of-phase operation with 90^ophase shift for two-

stage conversion in DDR mode

Applications

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.

•

Residential and Enterprise Gateways

• DSL Modems

• Routers and Switchers

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.

Pinout

ISL6444 (SSOP-28)

VCC

GND

LGATE1

PGND1

LGATE2

PGND2

PHASE2

UGATE2

PHASE1

UGATE1

BOOT1

BOOT2

ISEN2

EN2

ISEN1

EN1

The IC comes in a 28 lead SSOP package.

VOUT2

VSEN2

VOUT1

VSEN1

Ordering Information

PART NUMBER

TEMP. ( C)

PACKAGE

PKG. NO.

M28.15

OCSET2

SOFT2

OCSET1 11

ISL6444CA

-10 to 85

28 Ld SSOP

SOFT1

PG2/REF

DDR

VIN

ISL6444CA-T

-10 to 85

28 Ld SSOP

Taped and

Reeled

M28.15

15 PG1

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

1-888-INTERSIL or 321-724-7143 | Intersil (and design) is a registered trademark of Intersil Americas Inc.

12 3 4 5 6 7...18

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与ISL6444CA-T相关器件

型号	品牌	获取价格	描述	数据表
ISL6444CAZ	INTERSIL	获取价格	Dual PWM Controller with DDR Memory Option for Gateway Applications
ISL6445	INTERSIL	获取价格	1.4MHz Dual, 180 Degree Out-of-Phase, Step-Down PWM Controller
ISL6445IAZ	INTERSIL	获取价格	1.4MHz Dual, 180 Degree Out-of-Phase, Step-Down PWM Controller
ISL6445IAZ-TK	INTERSIL	获取价格	1.4MHz Dual, 180 Degree Out-of-Phase, Step-Down PWM Controller
ISL6446	INTERSIL	获取价格	Dual (180Â° Out-of-Phase) PWM and Linear Cont
ISL6446A	INTERSIL	获取价格	Dual (180Â°Out-of-Phase) PWM and Linear Contr
ISL6446AIAZ	RENESAS	获取价格	Dual (180° Out-of-Phase) PWM and Linear Controller; QSOP24; Temp Range: -40&de
ISL6446AIAZ-TK	RENESAS	获取价格	Dual (180° Out-of-Phase) PWM and Linear Controller; QSOP24; Temp Range: -40&de
ISL6446IAZ	INTERSIL	获取价格	Dual (180Â° Out-of-Phase) PWM and Linear Cont
ISL6446IAZ-TK	INTERSIL	获取价格	Dual (180Â° Out-of-Phase) PWM and Linear Cont

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