Maxim MAX15032 Datasheet

General Description

The MAX15032 constant-frequency, pulse-width-modu­lating (PWM), low-noise boost converter is intended for
low-voltage systems that need a locally generated high
voltage. This device is capable of generating low-noise,
high output voltages, with an output power capability
up to 600mW with a 2.9V input voltage. This device can
be used for a wide variety of applications, such as PIN
or varactor diode biasing and LCD displays. The
MAX15032 operates from +2.7V to +11V.

The constant-frequency (500kHz), current-mode PWM
architecture provides low-noise output voltage that is
easy to filter. A high-voltage internal lateral DMOS
power switch allows this device to boost output volt­ages up to 36V. The MAX15032 features a shutdown
mode to save power.

The MAX15032 is available in a small thermally
enhanced 3mm x 3mm 8-pin TDFN package and is
specified for operation over the -40°C to +125°C auto­motive temperature range.

Applications

Avalanche Photodiode Biasing

PIN Diode Bias Supplies

Low-Noise Varactor Diode Bias Supplies

STB Audio IC Supplies

LCD Displays

Features

o Input Voltage Range

+2.7V to +5.5V (Using Internal Charge Pump)
+5.5V to +11V

o Wide Adjustable Output Voltage Range: (V

IN

+ 1V)

to 36V

o Output Power: ≥ 600mW for V

IN

≥ 2.9V

o Internal 0.5Ω (typ), 40V Switch

o Constant PWM Frequency Provides Easy Filtering

in Low-Noise Applications

o 500kHz (typ) Switching Frequency

o 0.5µA (max) Shutdown Current

o Internal Soft-Start

o Small Thermally Enhanced 3mm x 3mm 8-Pin

TDFN Package

MAX15032

500kHz, 36V Output, 600mW PWM

Step-Up DC-DC Converter

________________________________________________________________

Maxim Integrated Products

1

1

+

34

865

PGND CN IN

MAX15032

2

7

CP

LX FB SHDNGND

TDFN

TOP VIEW

Pin Configuration

Ordering Information

MAX15032

INVIN = 2.7V TO 5.5V

V

OUT

36V

SHDN

PGND

LX

FB

CP

CN

GND

R1

D1

L1

R2

C

IN

C

OUT

C

CP

Typical Operating Circuit

19-4232; Rev 0; 8/08

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.

PART

TEMP RANGE

PIN-

PACKAGE

TOP

MARK

MAX15032ATA+T

-40°C to +125°C 8 TDFN-EP*

+BKP

+

Denotes a lead-free/RoHS-compliant package.

T = Tape and reel.

*

EP = Exposed pad.

MAX15032

500kHz, 36V Output, 600mW PWM
Step-Up DC-DC Converter

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(VIN= +3.3V, V

SHDN

= +3.3V, CIN= 10µF, PGND = GND = 0V, TA= TJ= -40°C to +125°C, unless otherwise noted. Typical values

are at T

A

= +25°C. See the

Typical Operating Circuit

.) (Note 2)

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.

Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-

layer board. For detailed information on package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial.

IN to GND ...............................................................-0.3V to +12V

LX to PGND ............................................................-0.3V to +40V

FB to GND ..............................................................-0.3V to +12V

SHDN to GND..............................................-0.3V to (V

IN

+ 0.3V)

CN to GND .............................................................-0.3V to +12V

CP to GND..............................................................-0.3V to +12V

PGND to GND .......................................................-0.3V to +0.3V

Continuous Power Dissipation (T

A

= +70°C)

8-Pin TDFN (derate 24.4mW/°C above +70°C) ......1951.2mW

Junction-to-Case Thermal Resistance (θ

JC

) (Note 1) ........8°C/W

Junction-to-Ambient Thermal Resistance (θ

JA

)

(Note 1) ........................................................................41°C/W

Operating Temperature Range .........................-40°C to +125°C

Junction Temperature......................................................+150°C

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

Lead Temperature (soldering, 10s) .................................+300°C

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

SUPPLY VOLTAGE

CCP = 10nF 2.7 5.5

Supply Voltage Range V

IN

CP connected to IN 5.5 11

V

VFB = 1.4V (no switching), CCP = 10nF,
V

IN

= 3.3V

12

Supply Current I

IN

VFB = 1.4V (no switching), CP = IN,
V

IN

= 11V

1.5 3

mA

Undervoltage Lockout V

UVLO

VIN rising 2.375 2.5 2.675 V

Undervoltage Lockout Hysteresis V

UVLO-HYS

100 mV

Shutdown Current I

SHDN

V

SHDN

= 0V 0.5 µA

LOGIC INPUT (SHDN)

SHDN Input Low Level V

IL

0.8 V

SHDN Input High Level V

IH

2.0 V

BOOST CONVERTER

Output Voltage Adjustment
Range

V

IN

+ 1 36 V

Switching Frequency f

SW

450 500 550 kHz

FB Set Point V

FB

1.214 1.245 1.276 V

FB Input Bias Current I

FB

300 nA

VIN = 2.9V, VCP = 5.5V 0.42 1

CCP = 10nF,
I

LX

= 100mA

V

IN

= 5.5V, VCP = 10V 0.33 1

VIN = VCP = 5.5V 0.42 1

LX Switch On-Resistance R

DS_ON

CP connected to
IN, I

LX

= 100mA

V

IN

= VCP = 11V 0.33 1

Ω

Peak Switch Current Limit I

LIM_LX

1 1.33 1.7 A

LX Leakage Current VLX = 36V 2 µA

Line Regulation I

LOAD

= 2mA 0.25 %

MAX15032

500kHz, 36V Output, 600mW PWM

Step-Up DC-DC Converter

_______________________________________________________________________________________ 3

Note 2: All devices are 100% production tested at room temperature (TA= +25°C). All parameter limits through the temperature

range are guaranteed by design.

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Load Regulation I

LOAD

= 0 to 20mA, V

OUT

= 30V 1 %

Soft-Start Duration 8ms

Soft-Start Steps (0.25 x I

LIM_LX

) to I

LIM_LX

32 Steps

THERMAL PROTECTION

Thermal Shutdown Rising +160 °C

Thermal-Shutdown Hysteresis 8°C

ELECTRICAL CHARACTERISTICS (continued)

(VIN= +3.3V, V

SHDN

= +3.3V, CIN= 10µF, PGND = GND = 0V, TA= TJ= -40°C to +125°C, unless otherwise noted. Typical values

are at T

A

= +25°C. See the

Typical Operating Circuit

.) (Note 2)

EFFICIENCY

vs. LOAD CURRENT

MAX15032 toc01

LOAD CURRENT (mA)

EFFICIENCY (%)

181612 144 6 8 102

40

45

50

55

60

65

70

75

80

85

35

020

V

OUT

= 36V

V

IN

= 5V

V

OUT

= 36V

V

IN

= 3.3V

EFFICIENCY

vs. LOAD CURRENT

MAX15032 toc02

LOAD CURRENT (mA)

EFFICIENCY (%)

181612 144 6 8 102

40

45

50

55

60

65

70

75

80

85

35

020

V

OUT

= 30V

V

IN

= 5V

V

OUT

= 30V

V

IN

= 3.3V

EFFICIENCY

vs. LOAD CURRENT

MAX15032 toc03

LOAD CURRENT (mA)

EFFICIENCY (%)

454030 3510 15 20 255

40

45

50

55

60

65

70

75

80

85

35

050

V

OUT

= 24V

V

IN

= 5V

V

OUT

= 24V

V

IN

= 3.3V

Typical Operating Characteristics

(VIN= 3.3V, L1 = 4.7µH, R1 = 143kΩ, R2 = 6.2kΩ, CIN= 10µF, C

OUT

= 2.2µF, CCP= 10nF, see the

Typical Operating Circuit

.

TA= +25°C, unless otherwise noted.)