ISL8023AIRTAJZ-T7A Intersil, ISL8023AIRTAJZ-T7A Datasheet

ISL8023AIRTAJZ-T7A

Manufacturer Part Number

ISL8023AIRTAJZ-T7A

Description

ISL8023 Series 2.7 - 5.5 V 3 A 4 Mhz Buck Regulator - TQFN-16

Manufacturer

Intersil

Datasheet

1.ISL8023AIRTAJZ-T7A.pdf (20 pages)

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Compact Synchronous Buck Regulator

ISL8023, ISL8024

The ISL8023, ISL8024 are highly efficient, monolithic,

synchronous step-down DC/DC converters that can deliver 3A

(ISL8023) or 4A (ISL8024) of continuous output current from a

2.7V to 5.5V input supply. The devices use current mode control

architecture to deliver very low duty cycle operation at high

frequency with fast transient response and excellent loop stability.

The ISL8023 and ISL8024 integrate a very low On-resistance

P-Channel (45mΩ) high side FET and N-Channel (19mΩ) low

side FET to maximize efficiency and minimize external

component count. The 100% duty-cycle operation allows less

than 200mV dropout voltage at 4A output current. The

operation frequency of the pulse-width modulator (PWM) is

adjustable from 500kHz to 4MHz. The default switching

frequency of 1MHz is set by connecting the FS pin high, which

allows for the use of small external components.

The ISL8023, ISL8024 can be configured for discontinuous or

forced continuous operation at light load. Forced continuous

operation reduces noise and RF interference while

discontinuous mode provides higher efficiency by reducing

switching losses at light loads.

Fault protection is provided by internal hiccup mode current

limiting during short circuit and overcurrent conditions. Other

protection, such as overvoltage and over-temperature are also

integrated into the device. A power-good output voltage

monitor indicates when the output is in regulation.

The ISL8023, ISL8024 offer a 1ms Power-Good (PG) timer at

power-up. When in shutdown, ISL8023, ISL8024 discharges

the output capacitor through an internal soft-stop switch. Other

features include internal fixed or adjustable soft-start and

internal/external compensation.

The ISL8023 and ISL8024 are offered in a space saving 16 Ld

3x3 Pb-free QFN package with an exposed pad for improved

thermal performance and 1mm maximum height. The

complete converter occupies less than 0.22 in

Various fixed output voltages are available upon request. See

the “Ordering Information” on page 4 for more details.

May 17, 2012

FN7812.2

FIGURE 1. EFFICIENCY T = +25°C V

area.

100

0.0 0.5

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

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

3.3V

1.0

OUT

PWM

1.5

PFM

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

OUT

2.0

(A)

Features

• 2.7V to 5.5V Input Voltage Range

• Very Low On-Resistance FET’s - P-Channel 45mΩ and

• High Efficiency Synchronous Buck Regulator with up to 95%

• 0.8% Reference Accuracy Over-temperature/Load/Line

• Complete BOM with as Few as 3 External Parts

• Start-up with Pre-Biased Output

• Internal Soft-Start - 1ms or Adjustable

• Soft-Stop Output Discharge During Disabled

• Adjustable Frequency from 500kHz to 4MHz - Default at

• External Synchronization up to 4MHz

• Over-temperature, Overcurrent, Overvoltage and Negative

• Tiny 3x3 QFN Package

Applications

• DC/DC POL Modules

• μC/µP, FPGA and DSP Power

• Plug-in DC/DC Modules for Routers and Switchers

• Portable Instruments

• Test and Measurement Systems

• Li-ion Battery Powered Devices

Related Literature

• See AN1759, “3A/4A Low Quiescent Current High Efficiency

2.5

N-channel 19mΩ Typical Values

Efficiency

1MHz (8023/24), 2MHz (8023A/24A)

Overcurrent Protection

Synchronous Buck Regulator”

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

3.0

= 5V

3.5

4.0

Related parts for ISL8023AIRTAJZ-T7A

ISL8023AIRTAJZ-T7A Summary of contents

Page 1

... CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. | 1-888-INTERSIL or 1-888-468-3774 Copyright Intersil Americas Inc. 2011, 2012. All Rights Reserved Intersil (and design trademark owned by Intersil Corporation or one of its subsidiaries. All other trademarks mentioned are the property of their respective owners. 4.0 ...

Page 2

... NOTE: Full solution in size board. The full schematic and Gerber files are available for download from 2 ISL8023, ISL8024 FIGURE 2. Intersil.com FN7812.2 May 17, 2012 ...

Page 3

Pin Configuration Pin Descriptions PIN NUMBER SYMBOL 1, 16 VIN 2 VDD SYNC COMP SGND 11, 12 PGND 13, 14, 15 PHASE Exposed Pad - 3 ISL8023, ...

Page 4

... MARKING ISL8023IRTAJZ 023A ISL8024IRTAJZ 024A ISL8023AIRTAJZ 23AA ISL8024AIRTAJZ 24AA NOTES: 1. Add “-T*” suffix for tape and reel. Please refer to 2. These Intersil Pb-free plastic packaged products employ special Pb-free material sets, molding compounds/die attach materials, and 100% matte tin plate plus anneal (e3 termination finish, which is RoHS compliant and compatible with both SnPb and Pb-free soldering operations) ...

Page 5

COMP 55pF SS SOFT Soft START SHUTDOWN 100k + EN VREF BANDGAP + EAMP - 3pF + VFB SLOPE Slope 6k COMP 0. 0.85*VREF + UV PG 1ms DELAY SGND - SCP 0.5V + FIGURE 4. ...

Page 6

... Thermal Information (Reference to GND) Thermal Resistance 16 LD TQFN Package (Notes Junction Temperature Range . . . . . . . . . . . . . . . . . . . . . . .-55°C to +125°C Storage Temperature Range .-65°C to +150°C Pb-Free Reflow Profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . see link below http://www.intersil.com/pbfree/Pb-FreeReflow.asp = -40°C to +85° SYMBOL TEST CONDITIONS V Rising, no load ...

Page 7

Electrical Specifications Unless otherwise noted, all parameter limits are established over the recommended operating conditions and the typical specification are measured at the following conditions: T Boldface limits apply over the operating temperature range, -40°C to +85° ...

Page 8

Typical Operating Performance SYNC = 1.0µ 22µ 22µF, I 100 90 1.2V OUT 1.5V OUT 1. 0.0 0.5 1.0 1.5 2.0 I ...

Page 9

Typical Operating Performance SYNC = 1.0µ 22µ 22µF, I 1.529 1.524 1.519 3.3V PFM MODE IN 1.514 5V PFM MODE IN 1.509 3.3V PWM MODE IN 1.504 ...

Page 10

Typical Operating Performance SYNC = 1.0µ 22µ 22µF, I PHASE 2V/Div V RIPPLE 20mV/Div OUT I 1A/Div L FIGURE 17. STEADY STATE OPERATION AT NO LOAD (PWM) ...

Page 11

Typical Operating Performance SYNC = 1.0µ 22µ 22µ 1A/Div L PG 2V/Div FIGURE 23. SOFT-START AT NO LOAD (PFM) FIGURE 25. SOFT-START AT FULL LOAD ...

Page 12

Typical Operating Performance SYNC = 1.0µ 22µ 22µF, I PHASE 5V/Div V RIPPLE 20mV/Div OUT I 0.2A/Div L SYNC 5V/Div FIGURE 29. STEADY STATE OPERATION AT NO ...

Page 13

Typical Operating Performance for A Part T = +25° 5V SYNC = 1.0µ 22µ 22µ VIN IN PHASE 2V/Div ...

Page 14

Theory of Operation The ISL8023, ISL8024 is a step-down switching regulator optimized for battery-powered handheld applications. The regulator operates at 1MHz fixed default switching frequency, when FS is connected to VIN, under heavy load conditions to allow smaller external inductors ...

Page 15

PWM CLOCK 8 CYCLES NOMINAL +1.5% V OUT Frequency Adjust The frequency of operation is fixed at 1MHz and internal compensation when FS is tied to VIN. Adjustable frequency range from 500kHz to 4MHz via simple resistor ...

Page 16

Soft Start-Up The soft start-up reduces the in-rush current during the start-up. The soft-start block outputs a ramp reference to the input of the error amplifier. This voltage ramp limits the inductor current as well as the output voltage speed ...

Page 17

Loop Compensation Design When there is an external resistor connected from FS to SGND, the COMP pin is active for external loop compensation. The ISL8023, ISL8024 uses constant frequency peak current mode control architecture to achieve fast loop transient response. ...

Page 18

REF V REF + + R6 C6 FIGURE 43. TYPE II COMPENSATOR Figure 43 shows the type II compensator and its transfer function is expressed as Equation ...

Page 19

... Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries. ...

Page 20

Package Outline Drawing L16.3x3D 16 LEAD THIN QUAD FLAT NO-LEAD PLASTIC PACKAGE Rev 0, 3/10 3.00 6 PIN 1 INDEX AREA (4X) 0.15 TOP VIEW (2.80 TYP) ( 1.60) TYPICAL RECOMMENDED LAND PATTERN 20 ISL8023, ISL8024 4X 1.50 A 12X ...

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