MP1540 - 1.3MHz, 18V Step-Up Converter

Oct 12, 2026

MP1540 is a 5-pin TSOT23 current-mode step-up converter designed for small, low-power applications. It switches at a fixed 1.3MHz, enabling the use of tiny, low-profile capacitors and inductors. With internal soft-start, it limits inrush current and supports longer battery life while operating from an input as low as 2.5V. The device includes UVLO, internal current limit, and thermal overload protection, and can generate up to 12V at 200mA from a 5V input.

LanguageEnglish

CategoryTechnology

FormatPDF

Pages9

Reading Time23 min

AccessFree to download

Description

Features

Applications

Typical Application

Package Reference

Absolute Maximum Ratings

Recommended Operating Conditions

Electrical Characteristics

Typical Performance Characteristics

TM MP1540 1.3MHz, 18V Step-Up Converter The Future of Analog IC Technology ~~ ~~TM~~ ~~ DESCRIPTION The MP1540 is a 5-pin thin TSOT23 current mode step-up converter intended for small, low power applications. The MP1540 switches at 1.3MHz and allows the use of tiny, low cost capacitors and inductors 2mm or less in height. Internal soft-start results in small inrush current and extends battery life. The MP1540 operates from an input voltage as low as 2.5V and can generate 12V at up to 200mA from a 5V supply. The MP1540 includes under voltage lockout, current limiting, and thermal overload protection to prevent damage in the event of an output overload. The MP1540 is available in a small 5-pin TSOT23 package. FEATURES • On Board Power MOSFET • Uses Tiny Capacitors and Inductors • 1.3MHz Fixed Switching Frequency • Internal Soft-Start • Operates with Input Voltage as Low as 2.5V and Output Voltage as High as 18V • 12V at 200mA from 5V Input • UVLO, Thermal Shutdown • Internal Current Limit • Available in a TSOT23-5 Package APPLICATIONS • Camera Phone Flash • Handheld Computers and PDAs • Digital Still and Video Cameras • External Modems • Small LCD Displays • White LED Driver “MPS”and “The Future of Analog IC Technology” are Trademarks of Monolithic Power Systems, Inc. TYPICAL APPLICATION VIN 5V OFF ON 100 EFF IC IENCY (%) 95 90 85 80 75 70 65 60 55 50 Efficiency vs Load Current | | | | | | | | --- | --- | --- | --- | --- | --- | | | | | VIN
| = 5V | | | | | | | | | | | | | | | | | | VIN = | 3.3V | |
= 4 | 2V | | | | | | IN | . | | | | | | | | | | | | | | | | | | | | | | | | | | | | | V 0 75 150 225 300 375 450 LOAD CURRENT (mA) MP1540_TAC_EC01 MP1540 Rev. 1.1 [www.MonolithicPower.com](www.MonolithicPower.com) 1 2/14/2006 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2006 MPS. All Rights Reserved. TM MP1540 – 1.3MHz, 18V STEP-UP CONVERTER PACKAGE REFERENCE | TOP VIEW | | | | | --- | --- | --- | --- | | SW
GND
FB | |
D9YW

IN
EN | | | | | MP1540_PD01_TSOT23-5 | | | Part Number* | Package | | Temperature | | MP1540DJ | TSOT23-5 | | –40°C to +85°C | * For Tape & Reel, add suffix –Z (eg. MP1540DJ–Z) For Lead Free, add suffix –LF (eg. MP1540DJ–LF–Z) ABSOLUTE MAXIMUM RATINGS (1) SW Pin ........................................–0.3V to +20V All Other Pins .............................–0.3V to +6.5V Junction Temperature .............................. 150°C Lead Temperature.................................... 260°C Storage Temperature ..............–65°C to +150°C Recommended Operating Conditions (2) Supply Voltage VIN ............................ 2.5V to 6V Output Voltage VOUT ........................... 3V to 18V Operating Temperature .............–40°C to +85°C Thermal Resistance (3) θJA θJC TSOT23-5 . ............................. 220 110 .. °C/W Notes: 1) Exceeding these ratings may damage the device. 2) The device is not guaranteed to function outside of its operating conditions. 3) Measured on approximately 1” square of 1 oz copper. ELECTRICAL CHARACTERISTICS VIN = VEN = 5V, TA = +25°C unless specified otherwise. | Parameters | Symbol | Condition | Min | Typ | Max | Units | | --- | --- | --- | --- | --- | --- | --- | | Operating Input Voltage | VIN | | 2.5 | | 6 | V | | Under Voltage Lockout | | | | 2.25 | 2.45 | V | | Under Voltage Lockout Hysteresis | | | | 92 | | mV | | Supply Current (Shutdown) | | VEN = 0V | | 0.1 | 1 | µA | | Supply Current (Quiescent) | | VFB = 1.3V | | 635 | 850 | µA | | Switching Frequency | fSW | | 1.0 | 1.3 | 1.6 | MHz | | Maximum Duty Cycle | | VFB = 0V | 80 | 85 | | % | | EN Threshold | | VEN Rising | 1.0 | 1.3 | 1.6 | V | | EN Threshold | | VEN Rising, VIN = 2.5V | | 1.1 | | V | | EN Hysteresis | | | | 100 | | mV | | EN Input B

FAQs

What input voltage range does the MP1540 support?

The recommended operating input voltage is 2.5V to 6V. Absolute maximum limits SW and other pins also constrain safe operation.

What output can the MP1540 provide from a 5V supply?

From a 5V input, the MP1540 can generate 12V at up to 200mA, within the specified operating conditions.

Which protections are included to prevent damage under overload conditions?

The MP1540 includes under-voltage lockout (UVLO), internal current limiting, and thermal overload/thermal shutdown protection to reduce damage risk during output overloads.

Oct 12, 2026

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