ISL80020A 데이터시트 PDF

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DATASHEET

Compact Synchronous Buck Converters

ISL80020, ISL80020A, ISL80015, ISL80015A

The ISL80020, ISL80020A, ISL80015 and ISL80015A are highly

efficient, monolithic, synchronous step-down DC/DC converters

that can deliver up to 2A of continuous output current from a 2.7V

to 5.5V input supply. They use peak current mode control

architecture to allow very low duty cycle operation. They operate

at either 1MHz or 2MHz switching frequency, thereby providing

superior transient response and allowing for the use of small

inductors. They have excellent stability.

Features

• VIN range 2.7V to 5.5V

• IOUT maximum is 1.5A or 2A (see Table 1 on page 2)

• Switching frequency is 1MHz or 2MHz (see Table 1 on page 2)

• Overcurrent and short circuit protection

• Over-temperature/thermal protection

The ISL80020, ISL80020A, ISL80015 and ISL80015A integrate

very low rDS(ON) MOSFETs in order to maximize efficiency. In

addition, since the high-side MOSFET is a PMOS, the need for a

Boot capacitor is eliminated, thereby reducing external

component count. They can operate at 100% duty cycle

(at 1MHz).

The device is configured in PWM (pulse width modulation) for

fast transient response, which helps reduce the output noise

and RF interference.

• Negative current protection

• Power-good and enable

• 100% duty cycle (1MHZ)

• Internal soft-start and soft-stop

• VIN undervoltage lockout and VOUT overvoltage protection

• Up to 95% peak efficiency

Applications

These devices are offered in a space saving 8 pin 2mmx2mm

TDFN lead free package with exposed pad for improved thermal

performance. The complete converter occupies less than

64mm2 area.

• General purpose POL

• Industrial, instrumentation, and medical equipment

• Telecom and networking equipment

• Game console

VIN

GND

EN

PG

+2.7V...+5.5V

C1

22µF

1 VIN

2 EN

ISL80015, ISL80020

3 SGND

4 PG

EPAD

9

L1

PHASE 8

PGND 7

+1.8V/2A

C2

22µF

NC 6

FB 5

0.6V

C3

22pF

R1

200kΩ 1%

R2

100kΩ 1%

VOUT

GND

R1

=

R2





V---V--F--O--B---

–

1

(EQ. 1)

FIGURE 1. TYPICAL APPLICATION CIRCUIT CONFIGURATION

100

90

80

70

2.5VOUT

1.5VOUT

1.8VOUT

3.3VOUT

60

50

400.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0

OUTPUT LOAD (A)

FIGURE 2. EFFICIENCY vs LOAD, fSW = 2MHz, VIN = 5V, TA = +25°C

February 17, 2015

FN6692.1

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 LLC 2015. All Rights Reserved

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.

ISL80020, ISL80020A, ISL80015, ISL80015A

Functional Block Diagram

SOSoFfTt-

START

27pF

200kΩ

SHUTDOWN

EN VREF

BANDGAP

EAMP

SHUTDOWN

-

3pF

+

FB

6kΩ

1.15*VREF

-

+

SLSOloPpEe

COMP

OV

0.85*VREF

VIN

-

+

UV

5MΩ

PG

1ms

DELAY

OSCILLATOR

+

COMP

-

PWM

LOGIC

CONTROLLER

PROTECTION

HS DRIVER

+

OCP

-

+

CSA

-

NEG CURRENT

SENSING

0.3V

-

SCP

+

SHUTDOWN

100Ω

VIN

P

PHASE

N

PGND

FIGURE 3. FUNCTIONAL BLOCK DIAGRAM

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FN6692.1

February 17, 2015

ISL80020, ISL80020A, ISL80015, ISL80015A

Electrical Specifications TJ = -40°C to +125°C, VIN = 2.7V to 5.5V, unless otherwise noted. Typical values are at TA = +25°C. Boldface

limits apply across the operating temperature range, -40°C to +85°C. (Continued)

PARAMETER

SYMBOL

TEST CONDITIONS

MIN

(Note 6)

MAX

TYP (Note 6) UNITS

OSCILLATOR

Nominal Switching Frequency

fSW ISL80020, ISL80015

ISL80020A, ISL80015A

800

1640

1000

2000

1200

2360

kHz

kHz

PG

Output Low Voltage

1mA sinking current

0.3 V

Delay Time (Rising Edge)

0.5 1 2.5 ms

PGOOD Delay Time (Falling Edge)

5 µs

PG Pin Leakage Current

OVP PG Rising Threshold

PG = VIN

0.01 0.1 µA

110 115 125 %

OVP PG Hysteresis

2%

UVP PG Rising Threshold

80 85 90 %

UVP PG Hysteresis

5%

EN LOGIC

Logic Input Low

0.4 V

Logic Input High

1.4 V

Logic Input Leakage Current

IEN Pulled up to 5.5V

0.1 1 µA

NOTES:

6. Parameters with MIN and/or MAX limits are 100% tested at +25°C, unless otherwise specified. Temperature limits established by characterization

and are not production tested.

7. Not tested in production. Characterized using evaluation board. Refer to Figures 8 through 11 load regulation diagrams. +105°C TA represents near

worst case operating point.

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FN6692.1

February 17, 2015

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