intersil ISL97519A DATA SHEET

®

ISL97519A

Data Sheet June 30, 2008

600kHz/1.2MHz PWM Step-Up Regulator

The ISL97519A is a high frequency, high efficiency step-up
voltage regulator operated at constant frequency PWM
mode. With an internal 2.0A, 200mΩ MOSFET, it can deliver
up to 1A output current at over 90% efficiency. Two
selectable frequencies, 600kHz and 1.2MHz, allow trade offs
between smaller components and faster transient response.
An external compensation pin gives the user greater
flexibility in setting frequency compensation allowing the use
of low ESR Ceramic output capacitors.

When shut down, it draws <1µA of current and can operate
down to 2.3V input supply. These features along with

1.2MHz switching frequency makes it an ideal device for
portable equipment and TFT-LCD displays.

The ISL97519A is available in an 8 Ld MSOP package with a
maximum height of 1.1mm. The device is specified for
operation over the full -40°C to +85°C temperature range.

Pinout

ISL97519A

(8 LD MSOP)

TOP VIEW

COMP SS

1

FB FSEL

2

EN VDD

3

GND LX

4

8

7

6

5

FN6683.2

Features

• >90% Efficiency

• 2.0A, 200mΩ Power MOSFET

• 2.3V to 5.5V Input

• Up to 25V Output

• 600kHz/1.2MHz Switching Frequency Selection

• Adjustable Soft-Start

• Internal Thermal Protection

• 1.1mm Max Height 8 Ld MSOP Package

• Pb-Free (RoHS compliant)

• Halogen Free

Applications

• TFT-LCD displays

• DSL modems

• PCMCIA cards

• Digital cameras

• GSM/CDMA phones

• Portable equipment

• Handheld devices

Ordering Information

PART

NUMBER

(Note)

ISL97519AIUZ 7519A 8 Ld MSOP MDP0043
ISL97519AIUZ-T* 7519A 8 Ld MSOP MDP0043
ISL97519AIUZ-TK* 7519A 8 Ld MSOP MDP0043
*Please refer to TB347 for details on reel specifications.

NOTE: 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). Intersil Pb-free products are MSL
classified at Pb-free peak reflow temperatures that meet or exceed
the Pb-free requirements of IPC/JEDEC J STD-020.

PART

MARKING

PACKAGE

(Pb-Free)

PKG.

DWG. #

1

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

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

| Intersil (and design) is a registered trademark of Intersil Americas Inc.

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

Copyright Intersil Americas Inc. 2008. All Rights Reserved

ISL97519A

Absolute Maximum Ratings (T

LX to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27V

V

to GND. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6V

DD

COMP, FB, EN, SS, FSEL to GND . . . . . . . . . -0.3V to (V

= +25°C) Thermal Information

A

Storage Temperature. . . . . . . . . . . . . . . . . . . . . . . .-65°C to +150°C

Operating Ambient Temperature . . . . . . . . . . . . . . . .-40°C to +85°C

DD

+0.3V)

Operating Junction Temperature . . . . . . . . . . . . . . . . . . . . . .+135°C

Power Dissipation . . . . . . . . . . . . . . . . . . . . . See Curves on page 5

Pb-free reflow profile . . . . . . . . . . . . . . . . . . . . . . . . . .see link below

http://www.intersil.com/pbfree/Pb-FreeReflow.asp

CAUTION: Do not operate at or near the maximum ratings listed for extended periods of time. Exposure to such conditions may adversely impact product reliability and
result in failures not covered by warranty.

IMPORTANT NOTE: All parameters having Min/Max specifications are guaranteed. Typical values are for information purposes only. Unless otherwise noted, all tests
are at the specified temperature and are pulsed tests, therefore: TJ = TC = T

Electrical Specifications V

= 3.3V, V

IN

OUT

= 12V, I

A

= 0mA, FSEL = GND, TA = -40°C to +85°C unless otherwise specified.

OUT

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.

PARAMETER DESCRIPTION CONDITIONS MIN TYP MAX UNIT

IQ1 Quiescent Current - Shutdown EN = 0V 1 5 µA
IQ2 Quiescent Current - Not Switching EN = V
IQ3 Quiescent Current - Switching EN = V

V

FB

I

B-FB

V

DD

D

-600kHz Maximum Duty Cycle FSEL = 0V 85 92 %

MAX

D

-1.2MHz Maximum Duty Cycle FSEL = V

MAX

I

LIM1

I

LIM2

I

EN

r

DS(ON)

I

LX-LEAK

ΔV

/ΔVINLine Regulation 3V < VIN < 5.5V, V

OUT

/ΔI

ΔV

OUT

F

OSC1

F

OSC2

V

IL

V

IH

G

M

V

DD-ON

HYS V

I

SS

-en Minimum Soft-Start Enable Voltage 40 65 150 mV

V

SS

ILIM-V

SS

Feedback Voltage 1.228 1.24 1.252 V
Feedback Input Bias Current 0.01 0.5 µA
Input Voltage Range 2.3 5.5 V

Current Limit - Max Peak Input Current VDD < 2.8V 1.0 A
Current Limit - Max Peak Input Current VDD > 2.8V 1.5 2.0 A
Shutdown Input Bias Current EN = 0V 0.01 0.5 µA
Switch ON-Resistance VDD = 2.7V, ILX = 1A 0.2 Ω
Switch Leakage Current VSW = 27V 0.01 3 µA

Load Regulation VIN = 3.3V, V

OUT

Switching Frequency Accuracy FSEL = 0V 500 620 740 kHz
Switching Frequency Accuracy FSEL = V
EN, FSEL Input Low Level 0.5 V
EN, FSEL Input High Level 1.5 V
Error Amp Tranconductance ΔI = 5µA 70 130 150 1µ/Ω
VDD UVLO On Threshold 1.95 2.1 2.25 V

UVLO Hysteresis 140 mV

DD

Soft-Start Charge Current 2 3 4 µA

-en Current Limit Around SS Enable V SS = 200mV 300 350 400 mA

, FB = 1.3V 0.7 mA

DD

, FB = 1.0V 3 4.5 mA

DD

DD

= 12V 0.2 %

OUT

= 12V , IO = 30mA to 200mA 0.3 %

OUT

DD

85 90 %

1000 1250 1500 kHz

OTP Over-Temperature Protection 150 °C

2

FN6683.2

June 30, 2008

Block Diagram

ISL97519A

EN SS

SHUTDOWN

AND START -UP

CONTROL

VDD

REFERENCE
GENERATOR

COMPARATOR

COMP

FSEL

OSCILLATOR

CURRENT

SENSE

GM

AMPLIFIER

PWM LOGIC

CONTROLLER

Pin Descriptions

PIN NUMBER PIN NAME DESCRIPTION

FET

DRIVER

LX

GND

FB

1 COMP Compensation pin. Output of the internal error amplifier. Capacitor and resistor from COMP pin to ground.
2 FB Voltage feedback pin. Internal reference is 1.24V nominal. Connect a resistor divider from V

V
3 EN Shutdown control pin. Pull EN low to turn off the device.
4 GND Analog and power ground.
5 LX Power switch pin. Connected to the drain of the internal power MOSFET.
6 VDD Analog power supply input pin.
7 FSEL Frequency select pin. When FSEL is set low, switching frequency is set to 620kHz. When connected to

high or VDD, switching frequency is set to 1.25MHz.
8 SS Soft-start control pin. Connect a capacitor to control the converter start-up.

Typical Application Circuit

R

3

1kΩ

C

4.7nF

5

OPEN

= 1.24V (1 + R1/R2). See “Typical Application Circuit” on page 3.

OUT

1

COMP

85.2kΩR

1

R

C

5

10kΩ

2

S1

FB

2

EN

3

GND

4

SS

FSEL

VDD

LX

8

7

6

5

C

4

27nF

C

2

0.1µF

+

C

1

22µF

10µH

D

1

2.3V TO 5.5V

C

+

3

22µF

12V

OUT

.

3

FN6683.2

June 30, 2008