Intersil ISL6227EVAL1 Manual

®ISL6227EVAL1 DDR Evaluation Board Setup

Procedure

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 rDS(ON) as the current sense element for

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 rDS(ON) of the lower MOSFET. If

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.

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. Forced

CCM on channel 2 for DDR application

• Uses MOSFET rDS(ON) for current sensing or uses

current-sense resistor for precision overcurrent protection

• Overvoltage, undervoltage and overcurrent protection

• Undervoltage lock-out on VCC pin

• Dual input voltage mode operation

- Operates directly from battery 5V 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 channel 1 in DDR application

Pinout ISL6227 (28 LD SSOP) TOP VIEW

Ordering Information

PART # TEMP. (°C) PACKAGE

PKG

DWG #

ISL6227CA -10 to 100 28 Ld SSOP M28.15

ISL6227CAZ

(Note)

-10 to 100 28 Ld SSOP (Lead-Free) M28.15

ISL6227CA-T -10 to 100 28 Ld SSOP Tape and Reel M28.15

ISL6227CAZ-T

(Note)

-10 to 100 28 Ld SSOP Tape and Reel

(Lead-Free)

M28.15

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.

EN1

GND

DDR

VSEN1

VIN PG1

VCC

VOUT1

ISEN1

LGATE1

PGND1

BOOT1

UGATE1

PHASE1

ISEN2

LGATE2

PGND2

BOOT2

UGATE2

PHASE2

EN2

VSEN2

VOUT2

OCSET2OCSET1

SOFT1 SOFT2

PG2/REF

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

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

Application Note June 2004 AN1067

JP3 —shunted =

CH1 enabled

JP4 — shunted =

CH2 enabled

JP2 —

shunted toward FCCM

(CH1 Fixed PWM Continuous Mode

Operation)

FIGURE 1. INITIAL SHUNT PLACEMENT FOR ISL6227EVAL1 (see Quick Setup)

JP1 — shunted

An AmpMeter may be

connected across

these pins to measure

IC and GATE Drive

Current

JP5 —shunted toward VINPRG when

Vin >5V, for feed-forward and program

90 degree out of phase PWM for CH1 &

CH2

JP2 —

shunted away from FCCM

(CH1 Automatic Mode)

C21, soft start cap of Ch2

CR1

GREEN = VOUT1 within PGOOD

range

RED = VOUT1 outside PGOOD

range

ISL6227

Regulator

Application Note 1067

Set the adjustable 5v output

voltage to zero volts. Connect

the positive terminal (+) to the

VCC terminal, and the positive

terminal (+) of the DVM to

J4 VCC.

Connect the negative

terminal

(-) of the electronic load

and negative terminal (-

) of the DVM to the

GND terminal J7 for ch1

(vddq).

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.

Connect the negative terminal (-) of

the 24VDC power supply and the

negative terminal (-) of the DVM to

the GND terminal J3.

FIGURE 2. WIRING CONNECTIONS FOR ISL6227EVAL1 (see Quick Setup)

Connect the positive terminal

(+) of the electronic load and

the positive terminal (+) of the

DVM to the VTT terminal J6

Connect the negative terminal (-)

of the 5VDC power supply and

the negative terminal

(-) of dvm and to the GND

terminal J1.

Connect the positive

terminal (+) of the

electronic load and

the positive terminal

(+) of the DVM to J5

VDDQ.

Connect the negative

terminal

(-) of the electronic load

and the negative

terminal

(-) of the DVM to the

GND terminal J9 for

ch2 (VTT)

Connect the positive terminal

(+) of the DVM to the V_ref

terminal J8

Connect the negative terminal

(-) of the DVM to the gnd

terminal J10

Oscilloscope tip

measurement point

for phase1

OSCILLOSCOPE TIP MEASUREMENT POINT FOR PHASE2

Application Note 1067

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

• 2 laboratory power supplies

• Precision digital multi-meters (DVM)

• Digital pulse generator

NOTE * = initial setting

Quick Setup Note:

• The VIN Power Supply must always be the FIRST

supply on and the LAST supply off to ensure start

up.

•The5VV

CC Power Supply must be between 5V ±

5%.

• Make sure the power is off before moving any

jumpers, except EN1 and EN2.

• Better connect/disconnect probes without

powering circuit

• Make sure the electronic loads are set at 0A

condition before the connection.

Step 1: Connect power supply and measurement

equipment.

1a. Connect VCC power supply

– Set the output voltage of the 5V adjustable power

supply to zero volts. Connect the positive terminal

(+) of the power supply to the VCC terminal J4.

Connect the negative terminal (-) of the 5VDC

power supply to the GND terminal J1.

1b. Connect VCC measurement equipment

– Connect the positive terminal (+) of a DVM to the

VCC terminal J4. Connect the negative terminal (-)

of the DVM to the GND terminal J1.

• Do not apply power yet

1c. Connect VIN power supply

– Set the adjustable 24VDC output voltage to zero

volts. Connect the positive terminal (+) of the power

supply to the VIN terminals J2. Connect the

negative terminal (-) of the 24VDC power supply to

the GND terminal J3.

1d. Connect VIN measurement equipment

– Connect the positive terminal (+) of a DVM to one of

the VIN terminals J2. Connect the negative terminal

(-) of the DVM to the GND terminal J3.

• Do not apply power yet

TABLE 1. Detailed Description of the Jumper Settings

Jumper Position Function

JP1 *Shunted

*An AmpMeter may be connected across

these pins to measure IC and GATE Drive

current

JP2

*FCCM *CH1 PWM Fixed Continuous Conduction

Mode Operation

Away from

FCCM

CH1 Hysteretic Operation

enabled

JP3 Shunted CH1 enabled

* Removed * CH1 disabled

JP4 Shunted CH2 enabled

* Removed * CH2 disabled

JP5

*Toward

VINPRG

* Use when Vin>5V, this will tie VIN pin to

the input voltage for feed forward and

program Ch2 PWM 90 phase lagging Ch1

Away from

VINPRG

Use when Vin<5V, this will tie VIN pin to

GND and program in phase PWM for CH1

and CH2

TABLE 2. LED condition indicator

LED Condition Condition Result

CR1

green VOUT1 WITHIN PGOOD

RANGE (89%-115% of

nominal value)

red

VOUT1 OUTSIDE PGOOD

RANGE (89-115% of

nominal value)

Application Note 1067

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 the electronic

load and the DVM to the GND terminal J7.

2b. Connect load for VTT channel and measurement

equipment

– Connect the positive terminal (+) of the electronic

load and the DVM to the VTT terminal J6. Connect

the negative terminal (-) of the electronic load and

the DVM to the GND terminal J9.

2c. Connect measurement equipment for VREF

– Connect the positive terminal (+) of a DVM to the

V_REF terminal J8. Connect the negative terminal

(-) of the DVM to the GND terminal J10.

Step 3: Set control jumper as illustrated in Table 1 on

page 4.

Step 4: Power up the EVAL board

4a. Take the adjustable 24VDC power supply that is

connected to the VIN terminals J2 and J3 and make

sure the output voltage is set to zero volts.

4b. Turn on the 24VDC power supply.

4c. While reading the DVM, increase the output voltage

of the 24VDC power supply to 5VDC.

4d. Turn on the 5VDC power supply, connected with

VCC.

4e. While reading the DVM, increase the output voltage

of the 5VDC power supply to 5VDC.

Step 5: Take initial measurements

(The LED should become red at this point)

5a. Install the EN1 shunt jumper JP3 for CH1 (VDDQ).

5b. Install the EN2 shunt jumper JP4 for CH2 (VTT).

5c. The last action will bring LED indictor from RED to

GREEN. And the PGOOD voltage on J11 should be

5V, equal to the VCC voltage.

5d. Read the DVM connected to the VDDQ

terminal J5. It should show a value between

2.450V-2.550V

5e. Read the DVM connected to the VTT

terminal J6. It should show a half the value of

VDDQ, between 1.225V-1.275V.

5f. Read the DVM connected to the V_REF terminal J8.

It should read half the value of VDDQ, between

1.225-1.275V.

NOTE: A 10 nF capacitor must be installed on to C21 position if JP4

is installed prior to JP3 to ensure proper start up. C21 is the soft start

capacitor for CH2, as shown in the schematics.

NOTE: Terminals J3 (EN1) and J4 (EN2) may be connected to a

pulse generator for controlled on/off operation and may be observed

with an oscilloscope. However, make sure the signal generator

enable voltage is no more than 5V VCC.

Step 6: Vary operating conditions

6a. Adjust the 24V VIN Power Supply between

5-24 VDC.

– The VDDQ and VTT DVM readings should stay at

the above reading range.

6b. Adjust the electronic load current level.

– The voltage readings on VDDQ, VTT, and V_REF

should be within the above reading range. The load

on VDDQ should be less than 5A with MOSFET

FDS6912 mounted in the original EVAL board

setup. The load on VTT should be less than 3A, and

the load on V_REF should be less than 10mA. A

resistor can be connected between J8 and J10 as a

load for V_REF. The resistor value should be

greater than 125 Ohm. If a larger current creating

MOSFET is used, the load on VDDQ can be higher

than 5A.

Step 7: Power off

7a. Turn off the VCC power supply

7b. Turn off the VIN power supply

Application Note 1067

D D

C C

B B

A A

VOUT2

VCC'

PG1

VOUT2

PG1

VCC'

VIN'

VOUT1

VCC

VCC'

Title

Size Document Number Rev

Date: Sheet of

ISL6225A eval_DDR A

ISL6227EVALUATION BOARD (DDR)

INTERSIL

Building 2A,Suite 105

4020 Stirrup Creek Drive

Phone: (919) 405 3650

Durham, NC 27703

Fax: (919) 405 3651

VTT

VIN

GND

VCC

VDDQ

GND

V_REF

GND

EN2

EN1

PGOOD

EN1 EN2 GND

FCCM

GND

VDDQ

VINPRG

VTT

C13

220u

JP5

J13

C21

JP1

R12

C25

4.7u

10V

JP4

1.0u

10V

4.7u

10V

C26

10n

50V

C23

4.7u

10V

C11

15n

50V

C24

4.6u

Panasonic ETQ-P6F4R6HFA

C14

220u

C10

0.15u

25V

C15

BSS123LT1

R20

10.0K

C12

220u

R13

FDS6912A

10u

25V

X5R

68u

16V

R16

680

J11

C16

4.7u

10V

JP3

TP1

VTT

17.8K

R18

680

TP4

PHASE 1

R14

10.0K

4.7u

10V

J14

JP2

C18

100k

BAT54WT1

J12

FDS6912A

4 5

R19

10.0K

R10

10.0k

0.15u

25V

C17

2.49K

R15

680

R11

10.0K

100k

TP3

PHASE 2

ISL6227

GND

LGATE1

PGND1

PHASE1

UGATE1

BOOT1

ISEN1

EN1

VOUT1

VSEN1

OCSET1

SOFT1

DDR

VIN

14 PG1 15

PG2/REF 16

SOFT2 17

OCSET2 18

VSEN2 19

VOUT2 20

EN2 21

ISEN2 22

BOOT2 23

UGATE2 24

PHASE2 25

PGND2 26

LGATE2 27

VCC 28

RED GREEN

CR1

LXA3025IGC-TR

C22

R17

680

C20

10n

50V

TP2

VDDQ

10u

25V

X5R

1.0u

10V

J10

1.5u

Panasonic ELL-6SH1R5M

1.00K

C19

FIGURE 3. ISL6227EVAL1 SCHEMATIC

Application Note 1067

TABLE 3. Bill of Materials (BOM)

Qty Reference Description Vendor MFG. Part No.

1 PWB-PCB,ISL6227EVAL1,REVA Intersil ISL6227EVAL1PCB

1 C1 CAP, RADIAL, 220uF, 25V, 20%, ALUM, ELEC Panasonic EEU-FC1E221

2 C20,C26 CAPACITOR, SMD, 0805,.01uF,50V, 10%,X7R Panasonic ECJ-2VB1H103K

1 C11 CAPACITOR, SMD, 0805,.015uF,50V,10%,X7R Panasonic ECU-V1H153K

2 C9,C10 CAPACITOR, SMD,0805, 0.15uF,25V,10%, X7R Panasonic ECJ-2YB1E154K

2 C7,C8 CAPACITOR, SMD, 1206, 1uF,10V, 10%,X7R Venkel C1206X7R100-105KNE

5 C5,C6,C16,C23,C25 CAPACITOR,SMD,1206,4.7uF,10V,10%,X7R Venkel C1206X7R100475KNE

3 C12,C13,C14,C24 CAP TANT,LOW ESR,SMD,D3,220uF,4V,20% Sanyo 4TPC220M

1 C4 CAP TANT,LOW ESR,SMD, D, 68uF, 16V,10% Kemet T494D686K016AS

2 C2,C3 CAPACITOR,SMD,1812, 10uf, 25V,20%, X5R Taiyo Yuden TMK432BJ106MM-T

4 TP1-TP4 CONN-GEN,SCOPE PROBE TEST PT,COMPACT Tektronix 131-5031-00

12 J1-J11, J14 CONN-GEN,TERMINAL POST,TH,.09 INSERTION Keystone 1502-2

2 J12,J13 CONN-HEADER,1x1,BRKAWY 1X36,2.54mm,ST Berg/FCI 68000-236-1X1

2 JP2,JP5 CONN-HEADER,1x3,BRKAWY 1X36,2.54mm,ST Berg/FCI 68000-236-1X3

3 JP1,JP3,JP4 CONN-HEADER,1x2,RETENTIVE,2.54mm,ST Berg/FCI 69190-202

5 JP1-JP5 CONN-JUMPER,2PIN,SHUNT SPC02SYAN

2 D1,D2 DIODE-SCHOTTKYBARR,SMD,SOT323,3P,30V,.2A ON-Semiconductor BAT54WT1-T

1 CR1 LED,SMD,4P,OTHER,POLARIZEDRED/GRN Lumex SSL-LXA3025IGC-TR

1 L1 PWR CHOKE COIL, SMD, 5.7mm, 4.6uH, 25% Panasonic ETQ-P6F4R6HFA

1 U1 IC-DUAL SWITCHER 30V,28P,QSOP Intersil ISL6227CA

1 Q1 TRANSISTOR,N-CHANNEL,3P,SOT23 ON-Semiconductor BSS123LT1-T

2 U2,U3 TRANSIST-DUAL MOS, N-CHANNEL, 8P, SOIC, 30V Fairchild FDS6912A

2 R2,R3 RESISTOR, SMD, 0805, 0ohm, 1/10W, TF Panasonic ERJ-6GEY0R00V

1 R5 RESISTOR, SMD, 0805, 1K, 1/10W, 1%, TF Panasonic ERJ-6ENF1001

5 R10,R11,R14,R19,R20 RESISTOR, SMD, 0805, 10K, 1/10W, 1%, TF Panasonic ERJ-6ENF1002V

2 R1,R9 RESISTOR,SMD, 0805, 100K, 1/10W, 1%, TF Panasonic ERJ-6ENF1003V

1 R8 RESISTOR,SMD, 0805, 17.8K, 1/10W, 1%, TF Panasonic ERJ-J6ENF1782V

1 R4 RESISTOR,SMD, 0805, 2.49K, 1/10W, 1%, TF Panasonic ERJ-6ENF2491

4 R15-R18 RESISTOR,SMD,0805,680ohm, 1/10W, 5%, TF Panasonic ERJ-6GEYJ681V

4 BAG,STATIC,5X8, ZIP LOC BUMPONS,.44inW x .20inH,DOMETOP,, BLACK SJ-5003-BLACK

0 C1,C15,C17,C18,C19,C21,C

22,C24

DO NOT POPULATE DNP

0 R6,R7,R12,R13 DO NOT POPULATE DNP

1 L2 PWR CHOKE COIL,SMD,6x6x3mm,1.5uH,20% 3.2A Panasonic ELL6SH1R5M

1 LABEL, FOR SERIAL NUMBER AND BOM REV # LABEL-SERIAL NUMBER

Application Note 1067

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