Datasheet > ISL6227CAZ-T

ISL6227CAZ-T

更新时间： 2024-11-11 21:54:35

品牌	Logo	应用领域
英特矽尔 - INTERSIL		开关光电二极管双倍数据速率控制器
页数	文件大小	规格书
26页	893K
描述
Dual Mobile-Friendly PWM Controller with DDR Option

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ISL6227CAZ-T 数据手册

ISL6227

Data Sheet

March 2004

FN9094.1

Dual Mobile-Friendly PWM Controller with

DDR Option

Features

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

The ISL6227 dual PWM controller delivers high efficiency

precision voltage regulation from two synchronous buck DC/DC

converters. It was designed especially to provide power

regulation for DDR memory, chipsets, graphics and other

system electronics in Notebook PCs. The ISL6227’s wide

input voltage range capability allows for voltage conversion

directly from ac/dc adaptor or Li-Ion battery pack.

• Operates from an input battery voltage range of 5V to 24V

or from 3.3V/5V system rail

• Complete DDR1 and DDR2 memory power solution with

VTT tracking VDDQ/2 and a VDDQ/2 buffered reference

output

• Flexible PWM or HYS plus PWM mode selection with HYS

diode emulation at light loads for higher system efficiency

• r

current sensing

Automatic mode transition of constant-frequency synchronous

rectification at heavy load, and hysteretic (HYS) diode-

emulation at light load, assure high efficiency over a wide range

of conditions. The HYS mode of operation can be disabled

separately on each PWM converter if constant-frequency

continuous-conduction operation is desired for all load levels.

Efficiency is further enhanced by using the lower MOSFET

DS(ON)

• Excellent dynamic response with voltage feed-forward and

current mode control accommodating wide range LC filter

selections

• Undervoltage lock-out on VCC pin

• Power-good, overcurrent, overvoltage, undervoltage

protection for both channels

as the current sense element.

DS(ON)

• Synchronized 300kHz PWM operation in PWM mode

• Pb-Free Available as an Option

Voltage-feed-forward ramp modulation, current mode control,

and internal feedback compensation provide fast response to

input voltage and load transients. Input current ripple is

minimized by channel-to-channel PWM phase shift of 0°, 90°, or

180° (determined by input voltage and status of the DDR pin).

Ordering Information

PKG.

PART #

TEMP. (°C)

PACKAGE

DWG. #

M28.15

The ISL6227 can control two independent output voltages

adjustable from 0.9V to 5.5V, or by activating the DDR pin,

transform into a complete DDR memory power supply solution.

In DDR mode, CH2 output voltage VTT tracks CH1 output

voltage VDDQ. CH2 output can both source and sink current, an

essential power supply feature for DDR memory. The reference

voltage VREF required by DDR memory is generated as well.

ISL6227CA

-10 to 100 28 Ld SSOP

ISL6227CAZ

(Note)

-10 to 100 28 Ld SSOP (Pb-Free)

ISL6227CA-T

-10 to 100 28 Ld SSOP Tape and Reel M28.15

ISL6227CAZ-T -10 to 100 28 Ld SSOP Tape and Reel M28.15

(Note) (Pb-Free)

In dual power supply applications the ISL6227 monitors the

output voltage of both CH1 and CH2. An independent PGOOD

(power good) signal is asserted for each channel after the soft-

start sequence has completed, and the output voltage is within

PGOOD window. In DDR mode CH1 generates the only

PGOOD signal.

NOTE: Intersil Pb-Free products employ special Pb-free material

sets; molding compounds/die attach materials and 100% matte tin

plate termination finish, which is 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-020B.

Pinout

Built-in overvoltage protection prevents the output from going

above 115% of the set point by holding the lower MOSFET on

and the upper MOSFET off. When the output voltage re-enters

regulation, PGOOD will go HIGH and normal operation

automatically resumes. Once the soft-start sequence has

completed, undervoltage protection latches the offending

channel off if the output drops below 75% of its set point value.

Adjustable overcurrent protection (OCP) monitors the voltage

ISL6227 (28 LD SSOP) TOP VIEW

GND

LGATE1

PGND1

PHASE1

UGATE1

BOOT1

ISEN1

VCC

LGATE2

PGND2

PHASE2

UGATE2

BOOT2

ISEN2

drop across the r

DS(ON)

of the lower MOSFET. If more precise

current-sensing is required, an external current sense resistor

may be used.

EN1

EN2

VOUT1

VOUT2

VSEN1 10

OCSET1 11

SOFT1 12

DDR 13

19 VSEN2

18 OCSET2

17 SOFT2

16 PG2/REF

15 PG1

Applications

• Notebook PCs and Desknotes

• Hand-held portable instruments

• Tablet PCs/Slates

VIN

12 3 4 5 6 7...26

中文翻译

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ISL6227CAZ-T 替代型号

型号	品牌	替代类型	描述	数据表
ISL6227CAZ	INTERSIL	类似代替	Dual Mobile-Friendly PWM Controller with DDR Option
ISL6227CA-T	INTERSIL	功能相似	Dual Mobile-Friendly PWM Controller with DDR Option

与ISL6227CAZ-T相关器件

型号	品牌	获取价格	描述	数据表
ISL6227HRZ	INTERSIL	获取价格	Dual Mobile-Friendly PWM Controller with DDR Option
ISL6227HRZ	ROCHESTER	获取价格	DUAL SWITCHING CONTROLLER, 345 kHz SWITCHING FREQ-MAX, PQCC28, 5 X 5 MM, ROHS COMPLIANT, P
ISL6227IA	INTERSIL	获取价格	Dual Mobile-Friendly PWM Controller with DDR Option
ISL6227IA	ROCHESTER	获取价格	DUAL SWITCHING CONTROLLER, 345kHz SWITCHING FREQ-MAX, PDSO28, 0.150 INCH, PLASTIC, SSOP-28
ISL6227IAZ	ROCHESTER	获取价格	DUAL SWITCHING CONTROLLER, 345 kHz SWITCHING FREQ-MAX, PDSO28, 0.150 INCH, ROHS COMPLIANT,
ISL6227IAZ	RENESAS	获取价格	Dual Mobile-Friendly PWM Controller with DDR Option; QFN28, QSOP28; Temp Range: See Datash
ISL6227IAZ	INTERSIL	获取价格	Dual Mobile-Friendly PWM Controller with DDR Option
ISL6227IAZ-T	ROCHESTER	获取价格	DUAL SWITCHING CONTROLLER, 345 kHz SWITCHING FREQ-MAX, PDSO28, 0.150 INCH, ROHS COMPLIANT,
ISL6227IAZ-T	RENESAS	获取价格	Dual Mobile-Friendly PWM Controller with DDR Option; QFN28, QSOP28; Temp Range: See Datash
ISL6227IRZ	INTERSIL	获取价格	Dual Mobile-Friendly PWM Controller with DDR Option

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