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General Description

The MAX1759 is a buck/boost regulating charge pump

that generates a regulated output voltage from a single

lithium-ion (Li+) cell, or two or three NiMH or alkaline

cells for small hand-held portable equipment. The

MAX1759 operates over a wide +1.6V to +5.5V input

voltage range and generates a fixed 3.3V or adjustable

(2.5V to 5.5V) output (Dual Mode

™)

. Maxim’s unique

charge-pump architecture allows the input voltage to be

higher or lower than the regulated output voltage.

Despite its high 1.5MHz operating frequency, the

MAX1759 maintains low 50µA quiescent supply current.

Designed to be an extremely compact buck/boost con-

verter, this device requires only three small ceramic

capacitors to build a complete DC-DC converter capa-

ble of generating a guaranteed 100mA (min) output

current from a +2.5V input. For added flexibility, the

MAX1759 also includes an open-drain power-OK

(POK) output that signals when the output voltage is in

regulation.

The MAX1759 is available in a space-saving 10-pin

µMAX package that is 1.09mm high and half the size of

an 8-pin SO.

Applications

Li+ Battery-Powered Applications

Miniature Equipment

Backup Battery Boost Converters

Translators

Features

♦ Regulated Output Voltage (Fixed 3.3V or

Adjustable 2.5V to 5.5V)

♦ 100mA Guaranteed Output Current

♦ +1.6V to +5.5V Input Voltage Range

♦ Low 50µA Quiescent Supply Current

♦ 1µA Shutdown Mode

♦ Load Disconnected from Input in Shutdown

♦ High 1.5MHz Operating Frequency

♦ Uses Small Ceramic Capacitors

♦ Short-Circuit Protection and Thermal Shutdown

♦ Small 10-Pin µMAX Package

MAX1759

Buck/Boost Regulating

Charge Pump in µMAX

________________________________________________________________ Maxim Integrated Products 1

OUT

CXP

CXNIN

SHDN

POK

MAX1759

µMAX

TOP VIEW

PGNDGND

+1.6V TO +5.5V

OUT

3.3V AT 100mA

OFF

OUT

POWER OK

OUT

POK

CXN CXP

PGNDGNDFB

SHDN

MAX1759

Typical Operating Circuit

19-1600; Rev 1; 6/00

PART

MAX1759EUB -40°C to +85°C

TEMP. RANGE PIN-PACKAGE

10 µMAX

Pin Configuration

Ordering Information

Dual Mode is a trademark of Maxim Integrated Products.

For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

1 2 3 4 5 6 7 8 9 10

Sommario

Pagina 1 - Charge Pump in µMAX

General DescriptionThe MAX1759 is a buck/boost regulating charge pumpthat generates a regulated output voltage from a singlelithium-ion (Li+) cell, or

Pagina 2

MAX1759Buck/Boost RegulatingCharge Pump in µMAXPackage Information10LUMAX.EPNote: The MAX1759 does not have an exposed pad.Maxim cannot assume respons

Pagina 3

MAX1759Buck/Boost RegulatingCharge Pump in µMAX2 _______________________________________________________________________________________ABSOLUTE MAXIM

Pagina 4

MAX1759Buck/Boost RegulatingCharge Pump in µMAX_______________________________________________________________________________________ 3ELECTRICAL CHA

Pagina 5

MAX1759Buck/Boost RegulatingCharge Pump in µMAX4 _______________________________________________________________________________________Typical Operat

Pagina 6

MAX1759Buck/Boost RegulatingCharge Pump in µMAX_______________________________________________________________________________________ 5Typical Operat

Pagina 7

MAX1759Buck/Boost RegulatingCharge Pump in µMAX6 _______________________________________________________________________________________Detailed Descr

Pagina 8

MAX1759Buck/Boost RegulatingCharge Pump in µMAX_______________________________________________________________________________________ 7CXNCXP PGNDSHD

Pagina 9

MAX1759Buck/Boost RegulatingCharge Pump in µMAX8 _______________________________________________________________________________________Capacitor Sele

Pagina 10

MAX1759Buck/Boost RegulatingCharge Pump in µMAX_______________________________________________________________________________________ 9Figure 4a. MAX

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