Intersil ISL8026EVAL3Z Manuale utente

User Guide 033

ISL8026xEVAL3Z Evaluation Board User Guide

Description

The ISL8026EVAL3Z and ISL8026AEVAL3Z are intended for use

by customers with requirements for point-of-load applications

sourcing from 2.5V to 5.5V. The ISL8026EVAL3Z and

ISL8026AEVAL3Z are used to demonstrate the performance of

the ISL8026 and ISL8026A, low quiescent high efficiency

synchronous buck regulator.

The ISL8026 and ISL8026A are offered in a 3mmx3mm

16 Ld TQFN package with 1mm maximum height. The

complete area that the converter occupies can be as small as

0.22in2.

Key Features

• High efficiency synchronous buck regulator with up to 95%

efficiency

• 1% reference accuracy over load/line/temperature

(-40°C to +85°C)

• Start-up with prebiased output

• Internal soft-start - 1ms or adjustable

• Soft-stop output discharge during disabled

• Adjustable frequency from 500kHz to 4MHz - default at 1MHz

(2MHz for ISL8026A)

• External synchronization up to 4MHz

• Negative OC protection

References

ISL8026, ISL8026A Datasheet

Specifications

PART

NUMBER

IOUT

(MAX)

(A)

fSW RANGE

(MHz)

VIN

RANGE

(V)

VOUT

RANGE

(V)

PART SIZE

(2mm)

ISL8026

Programmable

0.5 to 4MHz 2.5 to

5.5

0.6 to

5.5 3x3

ISL8026A Programmable

1to4MHz

NOTES:

1. The Evaluation Boards’ default configuration are VOUT = 1.8V for

ISL8026EVAL3Z (fSW = 1MHz) and ISL8026AEVAL3Z (fSW =2MHz).

2. VREF is 0.6V.

Ordering Information

PART NUMBER DESCRIPTION

ISL8026EVAL3Z Evaluation Board For ISL8026

ISL8026AEVAL3Z Evaluation Board For ISL8026A

FIGURE 1. BLOCK DIAGRAM

VIN

SYNC

PGND

PGND/

SGND

VOUT

GND

VIN

GND

ISL8026

EPAD

COMP

VIN

PHASE

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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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Recommended Equipment

The following materials are recommended to perform testing:

• 0V to 10V power supply with at least 10A source current

capability or 5V battery

• Electronic loads capable of sinking current up to 7A

• Digital Multimeters (DMMs)

• 100MHz quad-trace oscilloscope

• Signal generator

Quick Setup Guide

1. Ensure that the circuit is correctly connected to the supply and

loads prior to applying any power.

2. Connect the bias supply to VIN, the plus terminal to VIN, P4

and the negative return to PGND, P5.

3. Connect the output load to VOUT, the plus terminal to VOUT, P3

and the negative return to PGND, P7.

4. Verify that the position is set to PWM for SW2.

5. Verify that the position is set to ON for SW1.

6. Turn on the power supply.

7. Verify that the output voltage is 1.8V for VOUT.

Operating Range

By default, the ISL8026EVAL3Z is configured for the operating

conditions shown in the “Quick Setup Guide”. The board can also

support a wider operating range. Modifying the operating

conditions will change the performance results.

The ISL8026EVAL3Z and ISL8026AEVAL3Z outputs are preset to

1.8V for VOUT, however, output voltages can be adjusted from

0.6V to 5V. The output voltage programming resistor, R1, will

depend on the desired output voltage of the regulator. The value

for the feedback resistor is typically between 0Ωand 200kΩ, as

shown in Equation 1.

If the output voltage desired is 0.6V, then R2is left unpopulated

and R1is shorted. For faster response performance, add 10pF to

47pF in parallel to R1. Check the Bode plot to insure optimum

performance.

Frequency Control

The ISL8026 and ISL8026A have an FS pin that controls the

frequency of operation. Programmable frequency allows for

optimization between efficiency and external component size.

Default switching frequency is 1MHz for ISL8026EVAL3Z and

2MHz for ISL8026AEVAL3Z when FS is tied to VIN (R11 =0and

R12 is open). By changing the value of R12 , the switching

frequency can be changed from 500kHz to 4MHz according to

Equation 2:

When using R12 to adjust the operational frequency, this also

sets the external compensation mode. Please refer to the

ISL8026, ISL8026A datasheet for more details.

FIGURE 2. ISL8026EVAL3Z FIGURE 3. ISL8026AEVAL3Z

R2R1

VFB

VO VFB–

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





=(EQ. 1)

RTk 220 103



fOSC kHz

------------------------------ 14–= (EQ. 2)

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Soft-start Control

Short CSS to SGND for internal soft-start (approximately 1ms).

Populate CSS to adjust the soft-start time. This capacitor, along

with an internal 1.6µA current source, sets the soft-start interval

of the converter, tSS.

CSS must be less than 33nF to insure proper soft-start reset after

fault condition.

Switches Control

The ISL8026EVAL3Z and ISL8026AEVAL3Z boards contain SW1

and SW2 for various controls of the ISL8026, ISL8026A

circuitries. Table 1 details this function.

PCB Layout Recommendation

The PCB layout is a very important converter design step to make

sure the designed converter works well. For ISL8026, ISL8026A,

the power loop is composed of the output inductor L’s, the output

capacitor (COUT), the PHASE pins and the PGND pin. It is

necessary to make the power loop as small as possible and the

connecting traces among them should be direct, short and wide.

The switching node of the converter, the PHASE pins and the

traces connected to the node are very noisy, so keep the voltage

feedback trace away from these noisy traces. The input capacitor

should be placed as close as possible to the VIN pin. The ground

of input and output capacitors should be connected as close as

possible. The heat of the IC is mainly dissipated through the

thermal pad. Maximizing the copper area connected to the

thermal pad is preferable. In addition, a solid ground plane is

helpful for better EMI performance. It is recommended to add at

least 5 vias ground connection within the pad for the best

thermal relief.

TABLE 1. SWITCH SETTINGS

SW1 ENABLE FUNCTION

1OFFDISABLEVO

3ONENABLEVO

SW2 MODE FUNCTION

1 PWM Fixed PWM frequency at light

load

3 PFM Force continuous mode

CSS F 3.33 tSS s=(EQ. 3)

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ISL8026xEVAL3Z Schematic

FIGURE 4. SCHEMATIC

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Bill Of Materials

MANUFACTURER PART QTY UNIT

REFERENCE

DESIGNATOR DESCRIPTION MANUFACTURER

ISL8026REVAPCB 1 ea. PWB-PCB, ISL8026, REVA, ROHS IMAGINEERING INC

C0603C0G500-220JNE 1 ea. C4 CAP, SMD, 0603, 22pF, 50V, 5%, C0G, ROHS VENKEL

GRM188R71H221KA01D 1 ea. C7 CAP, SMD, 0603, 220pF, 50V, 10%, X7R, ROHS MURATA

C0603X7R160-333KNE 1 ea. CSS CAP, SMD, 0603, 33000pF, 16V, 10%, X7R, ROHS VENKEL

C0603X7R160-104KNE 1 ea. C3 CAP, SMD, 0603, 0.1µF, 16V, 10%, X7R, ROHS VENKEL

0 ea. C8 CAP, SMD, 0603, DNP-PLACE HOLDER, ROHS

GRM31CR60J226KE19L 4 ea. C1, C2, C5, C6 CAP, SMD, 1206, 22µF, 6.3V, 10%, X5R, ROHS MURATA

ETQP3W1R0WFN 1 ea. L1 (ISL8026) 1µH, 6.9mΩ, 8.1A, ROHS, SHIELDED PANASONIC

ETQP3WR68WFN 1 ea. L1 (ISL8026A) 0.68µH, 4.9mΩ, 9.6A, ROHS, SHIELDED PANASONIC

131-4353-00 2 ea. J1, J2 CONN-SCOPE PROBE TEST PT, COMPACT, PCB MNT, ROHS TEKTRONIX

1514-2 4 ea. P4, P5,

P7, P8

CONN-TURRET, TERMINAL POST, TH, ROHS KEYSTONE

5002 3 ea. P1, P2,

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

LTST-C170CKT 1 ea. D1 LED-GaAs RED, SMD, 2x1.25mm, 100mW, 40mA,

10mcd, ROHS

LITEON/VISHAY

ISL8026 1 ea. U1 IC-5A BUCK REGULATOR, 16P, QFN, 3x3, ROHS INTERSIL

2N7002-7-F 1 ea. Q1 TRANSISTOR, N-CHANNEL, 3 LD, SOT-23, 60V, 115mA,

ROHS

DIODES, INC.

0 ea R11 (ISL8026) RES, SMD, 0603, 0.1%, MF, DNP-PLACE HOLDER

1 ea. R11 (ISL8026A) RES, SMD, 0603, 0Ω, 1/16W, 1%, TF, ROHS GENERIC

ERJ-3EKF20R0V 1 ea. R3 RES, SMD, 0603, 20Ω, 1/10W, 1%, TF, ROHS PANASONIC

CR0603-10W-1003FT 1 ea. R2, R14 RES, SMD, 0603, 100k, 1/10W, 1%, TF, ROHS VENKEL

CR-0603-10W-1913FT 1 ea. R12 (ISL8026) RES, SMD, 0603, 191k, 1/10W, 1%. TF, ROHS VENKEL

1 ea. R12 (ISL8026A) RES, SMD, 0603, 0.1%, MF, DNP-PLACE HOLDER

CR0603-10W-2003FT 4 ea. R1, R4,

R6, R7

RES, SMD, 0603, 200k, 1/10W, 1%, TF, ROHS VENKEL

0 ea. R5, R8,

RES, SMD, 0603, DNP-PLACE HOLDER, ROHS

GT11MSCBE 2 ea. SW1, SW2 SWITCH-TOGGLE, SMD, 6 PIN, SPDT, 2POS, ON-ON, ROHS ITT INDUSTRIES/

C&K DIVISION

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ISL8026xEVAL3Z Board Layout

FIGURE 5. TOP LAYER COMPONENTS

ISL8026

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FIGURE 6. TOP LAYER ETCH

ISL8026xEVAL3Z Board Layout (Continued)

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FIGURE 7. SECOND LAYER ETCH

ISL8026xEVAL3Z Board Layout (Continued)

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FIGURE 8. THIRD LAYER ETCH

ISL8026xEVAL3Z Board Layout (Continued)

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FIGURE 9. BOTTOM LAYER ETCH

ISL8026xEVAL3Z Board Layout (Continued)

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