ISL85033-12VEVAL3Z Intersil, ISL85033-12VEVAL3Z Datasheet

ISL85033-12VEVAL3Z

Manufacturer Part Number

ISL85033-12VEVAL3Z

Description

EVAL BAORD FOR ISL85033

Manufacturer

Intersil

Series

-r

Datasheets

1.ISL85033IRTZ.pdf (25 pages)

2.ISL85033-12VEVAL3Z.pdf (6 pages)

Specifications of ISL85033-12VEVAL3Z

Main Purpose

DC/DC, Negative Inverter

Outputs And Type

1, Non-Isolated

Power - Output

Voltage - Output

-3.3 ~ -15 V

Current - Output

Voltage - Input

4.5 ~ 28 V

Regulator Topology

Buck

Frequency - Switching

300kHz ~ 2MHz

Board Type

Fully Populated

Utilized Ic / Part

ISL85033

Lead Free Status / Rohs Status

Lead free / RoHS Compliant

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ISL85033-12VEVAL3Z Wide V

Buck-Boost Regulator With Up to 5A Output Current

Hardware Description

The ISL85033 is a wide input range, dual standard buck

converter that can be configured to provide a negative output

voltage. The ISL85033-12VEVAL3Z evaluation board is used in

this application note to demonstrate the negative

configuration. In this configuration, V

(28V - V

The ISL85033 is offered in a 4mmx4mm 28 Ld TQFN package

with 1mm maximum height. The complete converter occupies

6.25cm

Key Features

• Wide Input Voltage Range from 4.5V to (28V - V

• Adjustable and Synchronizable Negative Output Voltage with

• Current Mode Control

• Adjustable Switching Frequency from 300kHz to 2MHz

• Power-Good Detection (referenced to V

• Externally Adjustable Soft-start Time

• Overcurrent and Hiccup Mode Short Circuit Protection,

• Boot Undervoltage Detection

• Default Out-of-phase Channels Reduce Voltage Ripple and

Recommended Equipment

The following materials are recommended to perform testing:

• 0V to 30V power supply with at least 7A source current

• Electronic loads capable of sinking current up to 7A

• Digital multimeters (DMMs)

• 100MHz quad-trace oscilloscope

• Signal generator

Quick Setup Guide

July 27, 2011

AN1636.1

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

2. Connect the bias supply to VIN1, the plus terminal to VIN1,

3. Verify that the position is ON for S1.

4. Turn on the power supply.

5. Verify the output voltage is -12V for V

Continuous Output Current up to 5A, depending on V

Thermal Overload Protection, UVLO

Component Size. User-selectable Phase Operation.

capability or a 5V battery

and loads prior to applying any power.

and the negative return to GND1.

OUT

area.

1-888-INTERSIL or 1-888-468-3774

can range from 4.5V to

OUT

)

OUT

)

OUT

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

and

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

Evaluating the Other Output Voltages

The ISL85033-12VEVAL3Z kit output is preset to -12V;

however, output voltages can be adjusted from -3.3V to -15V.

The output voltage programming resistor, R3, depends on the

desired output voltage of the regulator. The value for the

feedback resistor is typically between 0Ω and 142kΩ as

shown in Equation 1.

Table 1 summarizes the external component selection for

The curves in Figure 1 indicate the maximum output current

the converter can deliver as a function of the input voltage and

the selected output voltage configuration.

Figures 2, 3 and 4 show the efficiency for different V

and load combinations.

OUT

-12V

-15V

-5V

OUT

Negative V

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

= -5V, V

R3 = 43.2k; R5 = 20k; C4 = 2.7nF

C20 = 22µF (1210 ceramic)

C17 = 22µF (1210 ceramic)

C19 = 68µF (15mΩ polymer EEFUD0K680R)

R3 = 112k; R5 = 120k; C4 = 4.7nF

C14, C17 = 22µF (2210 ceramic)

C12, C19 = 68µF (70mΩ TaNbO2 TPSD686M020R0070)

C20 = DNP

R3 = 142k; R5 = 120k; C4 = 4.7nF

C14, C17 = 22µF (2210 ceramic)

C12, C19 = 68µF (70mΩ TaNbO2 TPSD686M020R0070)

C20 = DNP

⎛

⎝

VOUT

-------------- 1

VFB

TABLE 1. COMPONENT SELECTION FOR V

OUT

–

= -12V, and V

⎞

⎠

Application Note 1636

EXTERNAL COMPONENTS

OUT

= -15V.

Author: Paul Orfanu

OUT

, V

(EQ. 1)

OUT

Related parts for ISL85033-12VEVAL3Z

ISL85033-12VEVAL3Z Summary of contents

Page 1

... Negative V IN Evaluating the Other Output Voltages The ISL85033-12VEVAL3Z kit output is preset to -12V; however, output voltages can be adjusted from -3.3V to -15V. The output voltage programming resistor, R3, depends on the desired output voltage of the regulator. The value for the feedback resistor is typically between 0Ω and 142kΩ as shown in Equation 1 ...

Page 2

... ISL85033 data sheet for further information. Frequency Control The ISL85033-12VEVAL3Z evaluation board has an FS pin that controls the frequency of operation. Programmable frequency allows for optimization between efficiency and external component size. Default switching frequency is 500kHz when FS is tied to VCC (R9 = 0). By removing R9 and connecting R10 to ...

Page 3

... ISL85033-12VEVAL3Z Schematic A R3 22PF VNEG C13 113K 120K FB1 4700PF 22 SS1 3 SS1 8.06K BOOT1 5 VNEG VNEG C5 6 VNEG1 VNEG 0.01UF 7 -12V VNEG 1 29 JLX1 4 2 GNDO1 10UH C1 C14 D1 C12 TBD 22UF 68UF A B340B VIN VNEG VIN C2 C18 100UF VCC 10UF GND1 ...

Page 4

... H2510-01203 1/16W1 H2510-08061 1/16W1 H2510-ROPEN- R7, R8, R11, 6 OPEN R14-R16 H2511-00R00- R23, R24 2 1/16W H2511-00R00- R9, R18 2 1/16W1 ISL85033IRTZ U1 1 PAD_100 EN, FS, SI, SO, 9 PG1, PG2, SS1, SS2, VNEG 4 Application Note 1636 PACKAGE VALUE TOLERANCE VOLTAGE POWER TYPE CONN 68µF 20% 20V SMD SMD2 22µ ...

Page 5

... Bill of Materials (Continued) REFERENCE PART NUMBER DESIGNATOR QUANTITY PAD_150 VIN, GND1, 6 GNDO1, GNDO2, VNEG1, VNEG2 SQ1004 L1 ISL85033-12VEVAL3Z Layout FIGURE 5. TOP LAYER COMPONENTS FIGURE 7. SECOND LAYER ETCH 5 Application Note 1636 PACKAGE VALUE TOLERANCE VOLTAGE POWER TYPE THOLE 10µH 25% 4.8A SMD JEDEC TYPE ...

Page 6

... ISL85033-12VEVAL3Z Layout FIGURE 9. BOTTOM LAYER ETCH 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 ...

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