Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsPMICsPMIC - DC/DC voltage regulator Boost TDFN 8 EP

General Description

The MAX15032 constant-frequency, pulse-width-modu-

lating (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 volt-

ages 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 auto-

motive temperature range.

Applications

Avalanche Photodiode Biasing

PIN Diode Bias Supplies

Low-Noise Varactor Diode Bias Supplies

STB Audio IC Supplies

LCD Displays

Features

♦ Input Voltage Range

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

+5.5V to +11V

♦ Wide Adjustable Output Voltage Range: (V

+ 1V)

to 36V

♦ Output Power: ≥ 600mW for V

≥ 2.9V

♦ Internal 0.5Ω (typ), 40V Switch

♦ Constant PWM Frequency Provides Easy Filtering

in Low-Noise Applications

♦ 500kHz (typ) Switching Frequency

♦ 0.5µA (max) Shutdown Current

♦ Internal Soft-Start

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

TDFN Package

MAX15032

500kHz, 36V Output, 600mW PWM

Step-Up DC-DC Converter

________________________________________________________________

Maxim Integrated Products

865

PGND CN IN

MAX15032

LX FB SHDNGND

TDFN

TOP VIEW

Pin Configuration

Ordering Information

MAX15032

INV

= 2.7V TO 5.5V

OUT

36V

SHDN

PGND

GND

OUT

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.

Summary of content (10 pages)

PAGE 1
9-4232; Rev 0; 8/08 500kHz, 36V Output, 600mW PWM Step-Up DC-DC Converter 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.
PAGE 2
MAX15032 500kHz, 36V Output, 600mW PWM Step-Up DC-DC Converter ABSOLUTE MAXIMUM RATINGS Junction-to-Case Thermal Resistance (θJC) (Note 1) ........8°C/W Junction-to-Ambient Thermal Resistance (θJA) (Note 1) ........................................................................41°C/W Operating Temperature Range .........................-40°C to +125°C Junction Temperature ......................................................+150°C Storage Temperature Range .............................
PAGE 3
500kHz, 36V Output, 600mW PWM Step-Up DC-DC Converter (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 TA = +25°C. See the Typical Operating Circuit.) (Note 2) PARAMETER SYMBOL Load Regulation CONDITIONS MIN ILOAD = 0 to 20mA, VOUT = 30V Soft-Start Duration Soft-Start Steps (0.
PAGE 4
Typical Operating Characteristics (continued) (VIN = 3.3V, L1 = 4.7µH, R1 = 143kΩ, R2 = 6.2kΩ, CIN = 10µF, COUT = 2.2µF, CCP = 10nF, see the Typical Operating Circuit. TA = +25°C, unless otherwise noted.) VOUT = 12V VIN = 3.3V 65 60 55 50 45 40 L = 3.3μH 35 240 210 VOUT = 24V VOUT = 30V 180 150 120 90 60 30 VOUT = 36V 2.80 10 15 20 25 30 35 40 45 50 2.55 2.50 2.45 2.40 3 4 5 6 7 8 9 10 0 11 2 4 6 8 10 12 14 16 18 20 INPUT VOLTAGE (V) LOAD CURRENT (mA) SUPPLY CURRENT vs.
PAGE 5
00kHz, 36V Output, 600mW PWM Step-Up DC-DC Converter FB VOLTAGE vs. TEMPERATURE LINE-TRANSIENT RESPONSE LOAD-TRANSIENT RESPONSE MAX15032 toc14 1.29 IOUT = 1mA VOUT (AC-COUPLED) 200mV/div 1.28 VIN 1V/div FB VOLTAGE (V) 1.27 VOUT (AC-COUPLED) 50mV/div IOUT 5mA/div MAX15032 toc15 MAX15032 toc13 RISE TIME = 10ns 1.26 1.25 1.24 1.23 1.22 1.21 2ms/div 100ms/div -40 -25 -10 5 20 35 50 65 80 95 110 125 TEMPERATURE (°C) SHUTDOWN SUPPLY CURRENT vs. TEMPERATURE LX LEAKAGE CURRENT vs.
PAGE 6
500kHz, 36V Output, 600mW PWM Step-Up DC-DC Converter MAX15032 Pin Description PIN NAME FUNCTION 1 LX 2 GND Signal Ground. Connect directly to the local ground plane. Connect GND to PGND at a single point, typically near the output capacitor return terminal. 3 FB Feedback Regulation Point. Connect to the center tap of a resistive divider from the output (VOUT) to GND to set the output voltage. The FB voltage regulates to 1.245V (typ). 4 SHDN 5 IN Input Supply Voltage.
PAGE 7
500kHz, 36V Output, 600mW PWM Step-Up DC-DC Converter The MAX15032 constant-frequency, current-mode, pulse-width-modulating (PWM) boost converter is intended for low-voltage systems that often need a locally generated high voltage. This device is capable of generating low-noise, high-output voltage required for PIN and varactor diode biasing and LCD displays. The MAX15032 operates either from +2.7V to +5.5V or from +5.5V to +11V. For +2.7V to +5.
PAGE 8
MAX15032 500kHz, 36V Output, 600mW PWM Step-Up DC-DC Converter Determining Peak Inductor Current If the boost converter remains in the discontinuous mode of operation, then the approximate peak inductor current, I LPEAK (A), is represented by the formula below: 2 × TS × (VOUT ILPEAK = − Calculate the optimum value of L (LOPTIMUM) to ensure the full output power without reaching the boundary between continuous conduction mode (CCM) and DCM using the following formula: L OPTIMUM = VIN _ MIN ) × IOUT L M
PAGE 9
500kHz, 36V Output, 600mW PWM Step-Up DC-DC Converter C OUT [μ F] = ⎡ I × L OPTIMUM ⎤ ⎢ TS − LPEAK ⎥ (VO UT − VIN _ MIN ) ⎥⎦ ⎢⎣ 0 . 5 × Δ VOUT ESR[mΩ] = IOUT IOUT 0. 5 × Δ VOUT diate vicinity of the IC. Bulk aluminum electrolytic capacitors might be needed to avoid chattering at low input voltages.
PAGE 10
MAX15032 500kHz, 36V Output, 600mW PWM Step-Up DC-DC Converter Package Information Chip Information PROCESS: BiCMOS For the latest package outline information and land patterns, go to www.maxim-ic.com/packages. PACKAGE TYPE PACKAGE CODE DOCUMENT NO. 8 TDFN T833-2 21-0137 Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied.