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General Description

The ultra-small MAX1682/MAX1683 monolithic, CMOS

charge-pump voltage doublers accept input voltages

ranging from +2.0V to +5.5V. Their high voltage-con-

version efficiency (over 98%) and low operating current

(110µA for MAX1682) make these devices ideal for

both battery-powered and board-level voltage-doubler

applications.

Oscillator control circuitry and four power MOSFET

switches are included on-chip. The MAX1682 operates

at 12kHz, and the MAX1683 operates at 35kHz. A typi-

cal application includes generating a 6V supply to

power an LCD display in a hand-held PDA. Both parts

are available in a 5-pin SOT23 package and can deliver

30mA with a typical voltage drop of 600mV.

________________________Applications

Small LCD Panels

Cell Phones

Handy-Terminals

PDAs

____________________________Features

♦ 5-Pin SOT23 Package

♦ +2.0V to +5.5V Input Voltage Range

♦ 98% Voltage-Conversion Efficiency

♦ 110µA Quiescent Current (MAX1682)

♦ Requires Only Two Capacitors

♦ Up to 45mA Output Current

MAX1682/MAX1683

Switched-Capacitor Voltage Doublers

________________________________________________________________

Maxim Integrated Products

OUT

INC1-

15C1+GND

MAX1682

MAX1683

SOT23-5

TOP VIEW

Pin Configuration

VOLTAGE DOUBLER

C1+

C1-

OUT

GND

INPUT

SUPPLY

VOLTAGE

OUTPUT

VOLTAGE

2 x V

MAX1682

MAX1683

Typical Operating Circuit

19-1305; Rev 3; 11/10

PART

MAX1682EUK+T

-40°C to +85°C

TEMP

RANGE

PIN-

PACKAGE

5 SOT23-5

Ordering Information

Note: These parts are available in tape-and-reel only. Minimum

order quantity is 2500 pieces.

Denotes a lead(Pb)-free/RoHS-compliant package.

T = Tape and reel.

MAX1683EUK+T

-40°C to +85°C 5 SOT23-5

SOT

TOP MARK

ACCL

ACCM

Summary of content (9 pages)

PAGE 1
9-1305; Rev 3; 11/10 Switched-Capacitor Voltage Doublers ____________________________Features The ultra-small MAX1682/MAX1683 monolithic, CMOS charge-pump voltage doublers accept input voltages ranging from +2.0V to +5.5V. Their high voltage-conversion efficiency (over 98%) and low operating current (110µA for MAX1682) make these devices ideal for both battery-powered and board-level voltage-doubler applications.
PAGE 2
MAX1682/MAX1683 Switched-Capacitor Voltage Doublers ABSOLUTE MAXIMUM RATINGS IN to GND .................................................................+6V to -0.3V OUT to GND .......................................................+12V, VIN - 0.3V OUT Output Current............................................................50mA Output Short-Circuit Duration .................................1sec (Note 1) Continuous Power Dissipation (TA = +70°C) SOT23-5 (derate 7.1mW/°C above +70°C)...................
PAGE 3
Switched-Capacitor Voltage Doublers MAX1682, C1 = C2 = 10μF 40 30 30 VIN = 3.3V 25 20 15 VIN = 5V 10 20 5 -40 -20 MAX1682 OUTPUT RESISTANCE vs. CAPACITANCE VIN = 2V 40 20 40 5 10 15 25 -40 80 0 MAX1682/83 TOC05 30 25 VIN = 3.3V 20 15 600 80 C1 = C2 = 3.3μF 500 400 300 C1 = C2 = 10μF 200 VIN = 5V C1 = C2 = 33μF 100 0 0 35 0 5 10 15 20 25 30 35 0 5 10 15 20 25 30 35 40 IOUT (mA) MAX1683 OUTPUT VOLTAGE RIPPLE vs. OUTPUT CURRENT SUPPLY CURRENT vs.
PAGE 4
Typical Operating Characteristics (continued) (Typical Operating Circuit, VIN = +5V, C1 = C2 = 10µF for the MAX1682 and 3.3µF for the MAX1683, TA = +25°C, unless otherwise noted.) 12.0 VIN = 3.3V 11.5 VIN = 2V MAX1682/83 TOC11 38 VIN = 5V 36 34 32 VIN = 3.3V 10 9 VIN = 5V 8 OUTPUT VOLTAGE (V) VIN = 5V 40 OSCILLATOR FREQUENCY (kHz) MAX1682/83 TOC10 OSCILLATOR FREQUENCY (kHz) 12.5 MAX1682 OUTPUT VOLTAGE vs. OUTPUT CURRENT MAX1683 OSCILLATOR FREQUENCY vs.
PAGE 5
Switched-Capacitor Voltage Doublers PIN NAME FUNCTION 1 GND Ground 2 OUT Doubled Output Voltage. Connect C2 between OUT and GND. 3 C1- Negative Terminal of the Flying Capacitor 4 IN 5 C1+ Efficiency Considerations The power efficiency of a switched-capacitor voltage converter is affected by three factors: the internal losses in the converter IC, the resistive losses of the capacitors, and the conversion losses during charge transfer between the capacitors.
PAGE 6
MAX1682/MAX1683 Switched-Capacitor Voltage Doublers Conversion losses occur during the charge transfer between C1 and C2 when there is a voltage difference between them. The power loss is: ⎡ ⎛ 2 2⎞ PCONVERSION LOSS = ⎢1/ 2C1 ⎜ 4VIN − VOUT ⎟ + ⎢ ⎝ ⎠ ⎣ ⎛ ⎞⎤ 2 1/ 2C2 ⎜ 2VOUT VRIPPLE − V RIPPLE ⎟ ⎥ x fOSC ⎝ ⎠⎦ where VRIPPLE is the peak-to-peak output voltage ripple determined by the output capacitor and load current (see Output Capacitor section).
PAGE 7
Switched-Capacitor Voltage Doublers Paralleling Devices Paralleling multiple MAX1682 or MAX1683s reduces the output resistance. Each device requires its own pump capacitor (C1), but the reservoir capacitor (C2) serves all devices (Figure 4). Increase C2’s value by a factor of n, where n is the number of parallel devices. Figure 4 shows the equation for calculating output resistance. Layout and Grounding Good layout is important, primarily for good noise performance.
PAGE 8
Package Information For the latest package outline information and land patterns, go to www.maxim-ic.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status. PACKAGE TYPE PACKAGE CODE OUTLINE NO. LAND PATTERN NO. 5 SOT23 U5+2 21-0057 90-0174 SOT-23 5L .
PAGE 9
Switched-Capacitor Voltage Doublers Revision History REVISION NUMBER REVISION DATE 3 11/10 DESCRIPTION Added lead-free parts PAGES CHANGED 1 Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.