Intersil ISL85014EVAL1Z User manual

ISL85014EVAL1Z Evaluation Board User Guide

Description

The ISL85014 is a 3.8V to 18V input, 14A synchronous buck

regulator for applications with input voltage from multi-cell

batteries or regulated 5V and 12V power rails. The device also

provides an integrated bootstrap diode for the high-side gate

driver to reduce the external parts count. The ISL85014EVAL1Z

platform allows quick evaluation of the high-performance

features of the ISL85014 buck regulator.

Specifications

This board has been configured and optimized for the following

operating conditions:

• Input voltage ranges from 4.5V to 18V

• 1.8V nominal output voltage

• Up to 14A output current capability

• Default internally set to 600kHz switching frequency

• Default internally set to 3ms soft-start

• Operating temperature range: -40°C to +85°C

Key Features

• Switch selectable EN (enabled/disabled)

• Frequency synchronization option

• Jumper selectable mode (DEM/Forced CCM)

• Jumper selectable OCP mode (Hiccup/Latch-off)

• Jumper selectable frequency (600kHz/300kHz)

• Connectors and test points for easy probing

•Compactdesign

Related Literature

• For a full list of related documents, visit our website

-ISL85014 product pages

Ordering Information

PART NUMBER DESCRIPTION

ISL85014EVAL1Z Evaluation board for ISL85014FRZ

FIGURE 1. BLOCK DIAGRAM

PVIN 9

COMPEN

DNCDNC

BOOTVDDFREQSYNC

12 34 5 6

12131415

MODE

VIN

CIN

COUT

VOUT

GND

PVIN

GND C4

4.5V TO 18V

1.8V/14A

DEM

FCCM

LATCH-OFF

HICCUP

300kHz

600kHz

ENABLE

DISABLE

PHASE 8

GND 7

R2R1

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

Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.

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

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Connector and Test Point

Descriptions

The ISL85014EVAL1Z evaluation board includes I/O connectors

and test points as shown in Table 1.

Selection Switch and Jumper

Descriptions

•SwitchSW5(Enable)

The switch enables and disables the ISL85014:

- When the switch is in the ON position, the ISL85014 is

enabled.

- When the switch is in the OFF position, the ISL85014 is

disabled.

•JumperJ9

The jumper provides the selection of different operating

modes, detailed as follows:

- When the jumper is in the FCCM position, the ISL85014

operates in Forced CCM.

- When the jumper is in the DEM position, the ISL85014

operates in Diode Emulation mode and enables automatic

transition from CCM to DCM at light-load conditions.

• Jumper J10 sets the switching frequency at either 600kHz or

300kHz.

• Jumper J11 sets the OCP scheme in either Hiccup mode or

Latch-Off mode.

Quick Setup Guide

Refer to the following instructions to configure and power-up the

board for proper operation.

1. Set the power supply voltage to 12V and turn off the power

supply. Connect the positive output of the power supply to J1

(PVIN) and the negative output to J3 (GND).

2. Connect an electronic load to J2 (VOUT) for the positive

connection and J4 (GND) for the negative connection.

3. Measure the output voltage (test points VOUT and GND) with

the voltmeter.

4. Place scope probes on VOUT test point (J7) and other test

points of interest.

5. Toggle selection switch SW5 to ON position.

6. Set the load current to 0.1A and turn on the power supply. The

output voltage should be in regulation with a nominal 1.8V

output.

7. Slowly increase the load up to 14A while monitoring the

output voltage, which should remain in regulation with a

nominal 1.8V output.

8. Slowly sweep VIN from 4.5V to 18V. The output voltage should

remain in regulation with a nominal 1.8V output.

9. Decrease the input voltage to 0V to shut down the regulator.

Frequency Synchronization

The ISL85014 can be synchronized to an external clock with

frequency ranges from 100kHz to 1MHz by applying the external

clock to test point SYNC on the ISL85014EVAL1Z evaluation

board. The external clock should meet the specifications of pulse

width and voltage level described in the ISL85014 datasheet.

Evaluating Other Output

Voltages

The ISL85014EVAL1Z has a nominal 1.8V output voltage. The

output voltage is programmable by an external resistor divider

formed by R1and R2as shown in Figure 1 on page 1. R1 is

usually chosen first, then the value for R2can be calculated

based on R1 and the desired output voltage using Equation 1:

TABLE 1. CONNECTORS AND TEST POINTS

REFERENCE

DESIGNATOR DESCRIPTION

J1 Input voltage positive connection

J2 Output voltage positive connection

J3 Input voltage return connection

J4 Output voltage return connection

J6 Two-position socket connector for PHASE to GND test

J7 Two-position socket connector for VOUT to GND test

PVIN PVIN positive test point

GND GND test point

VIN VIN positive test point

VOUT Output voltage positive test point

SYNC External synchronization clock connection

EN Enable test point

VDD Internal LDO output test point

PG Power-good output

R10.6V

VOUT 0.6V–

----------------------------------

=(EQ. 1)

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PCB Layout Considerations

The PCB layout is critical for proper operation of the ISL85014.

The following guidelines should be followed to achieve good

performance.

1. Use a multilayer PCB structure to achieve optimized

performance. A four-layer PCB is recommended for this design.

2. Use a combination of bulk capacitors and smaller ceramic

capacitors with lower ESL for the input capacitors, and place

them as close to the IC as possible.

3. Place the VDD decoupling capacitor close to the IC between

VDD and GND. A 1µF ceramic capacitor is typically used.

4. Place a bootstrap capacitor close to the IC between the BOOT

and PHASE pins. A 0.1µF ceramic capacitor is typically used.

5. Connect the feedback resistor divider between the output

capacitor positive terminal and AGND pin of the IC, and place

the resistors close to the FB pin of the IC.

6. Connect the GND of the IC to the ground planes underneath

using multiple thermal vias to improve thermal performance.

ISL85014EVAL1Z Evaluation Board

FIGURE 2. TOP VIEW

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ISL85014EVAL1Z Schematic

FIGURE 3. ISL85014EVAL1Z SCHEMATIC

Enable

Disable

Internal

Compensation

600kHz

300kHz

FCCM

DEM

Hiccup

Latch off

R10

200

C11

100uF

DNP

1nF

J11

C16

DNP

22uF

VOUT

SYNC

C14

22uF

VDD

330uF/25V

2.2uF

100k

PVIN

100k

C10

100uF

SW5

SW SPDT

ISL85014

SYNC

MODE

FREQ

VDD

BOOT

GND

PVIN

PHASE

FB 10

COMP 11

NC 12

NC1 13

EN 14

VIN 15

VIN

200k

100k

DNP

100n

C13

22uF

DNP

0.68uH

DNP

GND

DNP

J10

C12

100uF

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Bill of Materials

REFERENCE

DESIGNATOR QTY DESCRIPTION PART NUMBER MANUFACTURER

U1 1 IC-14A BUCK REGULATOR, 15P, TDFN, 3.5x3.5, ROHS ISL85014FRZ INTERSIL

C6 1 CAP-OSCON, SMD, 10.3x10.3mm, 330µF, 25V, 20%, 14mΩ, ROHS 25SVPF330M SANYO

C4 1 CAP, SMD, 0402, 0.1µF, 50V, 10%, X7R, ROHS C1005X7R1H104K TDK

C5 1 CAP, SMD, 0603, 1.0µF, 25V, 10%, X5R, ROHS GRM188R61E105KA12D MURATA

C8 1 CAP, SMD, 0603, 2.2µF, 10V, 10%, X7R, ROHS GRM188R71A225KE15D MURATA

C10, C11, C12,

C18

4 CAP, SMD, 1206, 100µF, 6.3V, 20%, X5R, ROHS GRM31CR60J107ME39L MURATA

C9, C13, C14,

C17

4 CAP, SMD, 1210, 22µF, 25V, 10%, X7R, ROHS GRM32ER71E226KE15L MURATA

J6, J7 2 CONN-SOCKET STRIP, TH, 2P, 2.54mmPITCH, ROHS 310-87-102-41-001101 PRECI-DIP

VDD, SYNC, PG,

EN, GND, VIN,

PVIN, VOUT

8 CONN-MINI TEST POINT, VERTICAL, WHITE, ROHS 5002 KEYSTONE

J9, J10, J11 3 CONN-HEADER, 1x3, BREAKAWY 1x36, 2.54mm, ROHS 68001-203HLF BERG/FCI

L1 1 COIL-PWR CHOKE, SMD, 10x10x9.0mm, 0.68µH, 20%, ROHS 7443330068 WURTH

ELEKTRONIK

R7 1 RES, SMD, 0402, 20Ω, 1/16W, 1%, TF, ROHS ERJ2RKF20R0 PANASONIC

R9 1 RES, SMD, 0402, 0Ω, 1/16W, 5%, TF, ROHS CR0402-16W-00T VENKEL

R2, R4, R6 3 RES, SMD, 0402, 100k, 1/16W, 1%, TF, ROHS ERJ2RKF1003 PANASONIC

R10 1 RES, SMD, 0402, 200Ω, 1/16W, 1%, TF, ROHS ERJ-2RKF2000X PANASONIC

R1 1 RES, SMD, 0402, 200k, 1/16W, 1%, TF, ROHS MCR01MZPF2003 ROHM

C7 1 CAP, SMD, 0402, 1nF, 50V, 10%, X7R, ROHS MURATA

SW5 1 SWITCH-TOGGLE, SMD, 6PIN, SPDT, 2POS, ON-NONE-ON, ROHS GT11MSCBE-T ITT

INDUSTRIES/C&K

DIVISION

J1, J2 2 CONN-GEN, BIND. POST, INSUL-RED, THMBNUT-GND 111-0702-001 JOHNSONS

J3, J4 2 CONN-GEN, BIND. POST, INSUL-BLK, THMBNUT-GND 111-0703-001 JOHNSONS

Jumper 1 CONN-JUMPER, SHORTING, 2PIN, BLK, OPEN TOP, 2.54mmPITCH, ROHS 929950-00 3M

R3, R5 0 RES, SMD, 0402, DNP, TF, ROHS

C1, C2, C3, C16 0 CAP, SMD DNP-PLACE HOLDER, ROHS

PCB 1 PWB-PCB, ISL85014EVAL1Z, REVA, ROHS ISL85014EVAL1Z Any

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ISL85014EVAL1Z PCB Layout

FIGURE 4. TOP LAYER FIGURE 5. LAYER 2

FIGURE 6. LAYER 3 FIGURE 7. BOTTOM LAYER

User Guide 113

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 document is current before proceeding.

For information regarding Intersil Corporation and its products, see www.intersil.com

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Typical Performance Curves VIN = 12V, VOUT = 1.8V, L = 0.68µH, fSW = 600kHz, TA= +25°C, unless otherwise noted.

FIGURE 8. EFFICIENCY vs LOAD FIGURE 9. START-UP WITH EN, IOUT = 14A

FIGURE 10. LOAD TRANSIENT, 0A →14A →0A, 2.5A/µs FIGURE 11. OUTPUT VOLTAGE RIPPLE, IOUT = 14A

100

02468101214

OUTPUT CURRENT (A)

VIN = 12V, fsw = 600kHz, DEM

VIN = 5V, fsw = 600kHz, DEM

EFFICIENCY (%)

VOUT (1V/DIV)

EN (10V/DIV)

IL (10A/DIV)

1ms/DIV

50µs/DIV

IOUT (5A/DIV)

VOUT (50mV/DIV), AC COUPLING

VOUT (10mV/DIV), AC COUPLING

PHASE (5V/DIV)

1µs/DIV

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