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_______________General Description

The MAX619 step-up charge-pump DC-DC converter

delivers a regulated 5V ±4% output at 50mA over tem-

perature. The input voltage range is 2V to 3.6V (two

battery cells).

The complete MAX619 circuit fits into less than 0.1in

board space because it requires only four external

capacitors: two 0.22µF flying capacitors, and 10µF

capacitors at the input and output.

Low operating supply current (150µA max) and low

shutdown supply current (1µA max) make this device

ideal for small, portable, and battery-powered applica-

tions. When shut down, the load is disconnected from

the input.

The MAX619 is available in 8-pin DIP and SO packages.

________________________Applications

Two Battery Cells to 5V Conversion

Local 3V-to-5V Conversion

Portable Instruments & Handy-Terminals

Battery-Powered Microprocessor-Based Systems

5V Flash Memory Programmer

Minimum Component DC-DC Converters

Remote Data-Acquisition Systems

Compact 5V Op-Amp Supply

Regulated 5V Supply from Lithium Backup Battery

Switching Drive Voltage for MOSFETs in

Low-Voltage Systems

____________________________Features

♦ Regulated 5V ±4% Charge Pump

♦ Output Current Guaranteed over Temperature

20mA (V

≥ 2V)

50mA (V

≥ 3V)

♦ 2V to 3.6V Input Range

♦ No Inductors; Very Low EMI Noise

♦ Ultra-Small Application Circuit (0.1in

)

♦ Uses Small, Inexpensive Capacitors

♦ 500kHz Internal Oscillator

♦ Logic-Controlled 1µA Max Shutdown

Supply Current

♦ Shutdown Disconnects Load from Input

♦ 8-Pin DIP and SO Packages

_______________Ordering Information

* Dice are specified at T

= +25°C.

MAX619

Regulated 5V Charge-Pump

DC-DC Converter

________________________________________________________________

Maxim Integrated Products



MAX619

DIP/SO



C1+

OUT

C2+

C1-

SHDN

GND

C2-

TOP VIEW

__________________Pin Configuration

MAX619

OUT



C2+

C2-

IN



SHDN

C1+

C1-

INPUT

2V to 3.6V

ON/OFF

0.22µF

OUTPUT

5V, 20mA

10µF

0.22µF

GND

__________Typical Operating Circuit

19-0227; Rev 2; 5/96

EVALUATION KIT MANUAL

FOLLOWS DATA SHEET

For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800

PART TEMP. RANGE PIN-PACKAGE

MAX619CPA 0°C to +70°C 8 Plastic DIP

MAX619CSA 0°C to +70°C 8 SO

MAX619C/D 0°C to +70°C Dice*

MAX619EPA -40°C to +85°C 8 Plastic DIP

MAX619ESA -40°C to +85°C 8 SO

MAX619MJA -55°C to +125°C 8 CERDIP

Summary of content (7 pages)

PAGE 1
9-0227; Rev 2; 5/96 NUAL KIT MA ATION EET H S A EVALU T WS DA FOLLO Regulated 5V Charge-Pump DC-DC Converter ____________________________Features ♦ Regulated 5V ±4% Charge Pump ♦ Output Current Guaranteed over Temperature 20mA (VIN ≥ 2V) 50mA (VIN ≥ 3V) ♦ 2V to 3.6V Input Range ♦ No Inductors; Very Low EMI Noise ♦ Ultra-Small Application Circuit (0.
PAGE 2
MAX619 Regulated 5V Charge-Pump DC-DC Converter ABSOLUTE MAXIMUM RATINGS VIN to GND ............................................................-0.3V to +5.5V VOUT to GND .........................................................-0.3V to +5.5V SHDN to GND ..............................................-0.3V to (VIN + 0.3V) IOUT Continuous (Note 1)..................................................120mA Continuous Power Dissipation (TA = +70°C) Plastic DIP (derate 9.09mW/°C above +70°C) ............
PAGE 3
Regulated 5V Charge-Pump DC-DC Converter EFFICIENCY vs. OUTPUT CURRENT AND INPUT VOLTAGE 200 VIN = 1.8V 75 VIN = 3.3V E B 120 100 80 VIN = 3.6V 70 A B C D E F G A 60 VIN = 2.4V 40 65 VIN = 2.7V 100 C 140 VIN = 2.0V IIN (mA) EFFICIENCY (%) 80 SHDN = 0V F 160 VIN = 3.0V 1000 G D 180 20 VIN IOUT 1.8 2.0 2.4 2.7 3.0 3.6 3.3 18 36 41 64 72 94 100 MAX IIN (µA) 90 85 NO-LOAD INPUT CURRENT vs. INPUT VOLTAGE INPUT CURRENT vs. OUTPUT CURRENT 1.
PAGE 4
MAX619 Regulated 5V Charge-Pump DC-DC Converter _____________________Pin Description PIN NAME FUNCTION 1 C1+ Positive Terminal for C1 2 IN 3 OUT +5V Output Voltage. VOUT = 0V when in shutdown mode.
PAGE 5
Regulated 5V Charge-Pump DC-DC Converter MAX619 IN C3 10µF MAX619 P IC POWER S1A C2+ * P OUT S2A C4 C2 0.22µF IN S1B C2- VIN/VOUT CONTROL LOGIC S2B C1+ 10µF FB SWITCH CONTROL BUS VREF S1C C1 0.22µF SHDN SD S2C C1S1D GND * SWITCHES SHOWN IN TRIPLER MODE, DISCHARGE CYCLE Figure 1.
PAGE 6
MAX619 Regulated 5V Charge-Pump DC-DC Converter __________Applications Information Capacitor Selection Charge-Pump Capacitors C1 and C2 The values of charge-pump capacitors C1 and C2 are critical to ensure adequate output current and avoid excessive peak currents. Use values in the range of 0.22µF to 1.0µF. Larger capacitors (up to 50µF) can be used, but larger capacitors will increase output ripple. Ceramic or tantalum capacitors are recommended.
PAGE 7
Regulated 5V Charge-Pump DC-DC Converter ___________________Chip Topography Paralleling Devices Two MAX619s can be placed in parallel to increase output drive capability. The IN, OUT, and GND pins can be paralleled, but C1 and C2 pins cannot. The input bypass capacitor and output filter capacitor are, to some extent, shared when two circuits are paralleled.