ISL6227EVAL1 Intersil, ISL6227EVAL1 Datasheet

ISL6227EVAL1

Manufacturer Part Number

ISL6227EVAL1

Description

EVALUATION BOARD 1 ISL6227

Manufacturer

Intersil

Datasheets

1.ISL6227CAZ.pdf (27 pages)

2.ISL6227EVAL1.pdf (11 pages)

Specifications of ISL6227EVAL1

Main Purpose

Special Purpose DC/DC, DDR Memory Supply

Outputs And Type

2, Non-Isolated

Voltage - Output

0.9 ~ 5.5V

Voltage - Input

5 ~ 24V

Regulator Topology

Buck

Frequency - Switching

300kHz

Board Type

Fully Populated

Utilized Ic / Part

ISL6227

Lead Free Status / RoHS Status

Contains lead / RoHS non-compliant

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This document describes the setup procedure for the

ISL6227 Evaluation Board DDR implementation. For

information about the dual switcher application, please refer

to the ISL6227EVAL2 Evaluation Board Setup Procedure.

General Description

The ISL6227 can control two output voltages adjustable from

0.9V to 5.5V. The ISL6227 combines two synchronous PWM

voltage regulators into a single IC. When the DDR pin is set

to high, it transforms the IC into a complete DDR application.

Channel 1 can be set at a fixed 300kHz forced PWM mode or

an automatic mode with hysteretic diode-emulation at light

load and constant-frequency PWM synchronous rectification

at heavy load, assure high efficiency over a wide range of

conditions. Channel 2 is set at fixed 300kHz forced PWM

mode with synchronous rectification because of sinking

current requirement for DDR applications. Both channels use

the lower MOSFET r

high efficiency operations. It is preferred that the input of the

second channel connects to the output of the first channel in

DDR applications.

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

and internal feedback compensation provide fast response to

input voltage and output load transients.

ISL6227 monitors the output voltage of CH1 only by the

voltage on VSEN1 pin. PGOOD1 (power good) signal is

asserted after its soft-start sequence has completed, and the

output voltage within -11%/+15% of the set point. PGOOD2

pin is used to bring the VDDQ/2 into the chip as the

reference voltage of the second channel error amplifier.

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 decays below the overvoltage threshold, normal

operation automatically resumes. Once the soft-start

sequence has completed, undervoltage protection will latch

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

value. There is no overvoltage protection for Channel 2 in

DDR application.

Adjustable overcurrent protection (OCP) monitors the

voltage drop across the r

more precise current-sensing is required, an external current

sense resistor may be used. The OCP threshold can be

adjusted by the resistor on OCSET pin and the current

sensing gain can be adjusted by the resistor from ISEN pin

to the phase node of the converter. Any overcurrent on the

second channel will be reflected to the first channel. There is

no OCP for the second channel.

In order to alleviate the interaction between the two channels

caused by the switching noise, a phase shift has been

implemented on the controller. If the input voltage is above

5V, the VIN pin should connect the input voltage. This would

provide the input voltage feed forward function and

command the second channel 90 degree lagging the first

channel. If the input voltage is at 3.3V, the VIN pin should

connect to ground. This would result in a fixed ramp for the

PWM comparator and command an in-phase operation of

the two channels.

DS(ON)

as the current sense element for

of the lower MOSFET. If

Application Note

ISL6227EVAL1 DDR Evaluation Board Setup

1-888-INTERSIL or 321-724-7143

Features

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

• Uses MOSFET r

• Overvoltage, undervoltage and overcurrent protection

• Undervoltage lock-out on VCC pin

• Dual input voltage mode operation

• Excellent dynamic response

• Power-good signal for channel 1 in DDR application

NOTE: Intersil Lead-Free products employ special lead-free material

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

plate termination finish, which is compatible with both SnPb and lead-

free soldering operations. Intersil Lead-Free products are MSL

classified at lead-free peak reflow temperatures that meet or exceed

the lead-free requirements of IPC/JEDEC J Std-020B.

Pinout

Ordering Information

ISL6227CA

ISL6227CAZ

(Note)

ISL6227CA-T

ISL6227CAZ-T

(Note)

- High efficiency over wide load range

- Synchronous buck converter with hysteretic operation at

- Selection of hysteretic/CCM mode on channel 1. Forced

current-sense resistor for precision overcurrent protection

- Operates directly from battery 5V to 24V input

- Operates from 3.3V or 5V system rail

- Combined voltage feed-forward and current mode

PART #

light load

CCM on channel 2 for DDR application

control

All other trademarks mentioned are the property of their respective owners.

Intersil (and design) is a registered trademark of Intersil Americas Inc.

PHASE1

OCSET1

UGATE1

LGATE1

June 2004

PGND1

BOOT1

VOUT1

VSEN1

SOFT1

ISL6227 (28 LD SSOP) TOP VIEW

ISEN1

TEMP. (°C)

GND

DDR

-10 to 100 28 Ld SSOP

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

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

-10 to 100 28 Ld SSOP Tape and Reel

EN1

VIN

DS(ON)

for current sensing or uses

(Lead-Free)

PACKAGE

Procedure

VCC

LGATE2

PGND2

PHASE2

UGATE2

BOOT2

ISEN2

EN2

VOUT2

VSEN2

OCSET2

SOFT2

PG2/REF

PG1

AN1067

M28.15

DWG #

PKG

Related parts for ISL6227EVAL1

ISL6227EVAL1 Summary of contents

Page 1

... This would result in a fixed ramp for the PWM comparator and command an in-phase operation of the two channels. 1 ISL6227EVAL1 DDR Evaluation Board Setup Features • Provides regulated output voltage in the range of 0.9V–5.5V - High efficiency over wide load range - Synchronous buck converter with hysteretic operation at light load - Selection of hysteretic/CCM mode on channel 1 ...

Page 2

... Automatic Mode) JP2 — shunted toward FCCM (CH1 Fixed PWM Continuous Mode Operation) FIGURE 1. INITIAL SHUNT PLACEMENT FOR ISL6227EVAL1 (see Quick Setup) C21, soft start cap of Ch2 GREEN = VOUT1 within PGOOD RED = VOUT1 outside PGOOD 1. JP5 —shunted toward VINPRG when Vin > ...

Page 3

... DVM to the GND terminal J3. FIGURE 2. WIRING CONNECTIONS FOR ISL6227EVAL1 (see Quick Setup) Set the adjustable 24vdc output voltage to zero volts. Connect the positive terminal (+) of the adjustable 24VDC power supply and the positive terminal (+) of the dvm to VIN terminal J2 ...

Page 4

... What’s Inside This Evaluation Board Kit contains the following materials: • the ISL6227EVAL1 Evaluation Board • the ISL6227EVAL1 Evaluation Board Setup Procedure. What is Needed The following items will be needed to perform a complete evaluation: • 4 channel oscilloscope with probes • 2 electronic loads • ...

Page 5

Step 2: Connect load and measurement equipment 2a. Connect load for VDDQ channel and measurement equipment – Connect the positive terminal (+) of the electronic load and the DVM to the VDDQ terminal J5. Connect the negative terminal (-) of ...

Page 6

... C18 10.0k NI VCC PGOOD J11 GND R15 R16 J14 680 680 CR1 LXA3025IGC-TR RED GREEN VDDQ VOUT1 A Q1 PG1 + + BSS123LT1 C24 C13 NI 220u 5 FIGURE 3. ISL6227EVAL1 SCHEMATIC 10u 10u 25V 25V R1 X5R X5R 100k PHASE 1 VCC' C5 4.7u TP4 10V GND VCC 2 27 ...

Page 7

... R6,R7,R12,R13 DO NOT POPULATE 1 L2 PWR CHOKE COIL,SMD,6x6x3mm,1.5uH,20% 3.2A 1 LABEL, FOR SERIAL NUMBER AND BOM REV # 7 Application Note 1067 Description ON-Semiconductor ON-Semiconductor Vendor MFG. Part No. Intersil ISL6227EVAL1PCB Panasonic EEU-FC1E221 Panasonic ECJ-2VB1H103K Panasonic ECU-V1H153K Panasonic ECJ-2YB1E154K Venkel C1206X7R100-105KNE Venkel C1206X7R100475KNE Sanyo 4TPC220M Kemet ...

Page 8

Application Note 1067 8 ...

Page 9

Application Note 1067 9 ...

Page 10

Application Note 1067 10 ...

Page 11

... Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without notice. Accordingly, the reader is cautioned to verify that the Application Note or Technical Brief is current before proceeding. For information regarding Intersil Corporation and its products, see www.intersil.com 11 Application Note 1067 ...

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