Datasheet

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General Description

The MAX1658/MAX1659 linear regulators maximize

battery life by combining ultra-low supply currents

and low-dropout voltages. They feature Dual Mode™

operation, which presets the output to 3.3V (MAX1658) or

5V (MAX1659), or permits it to be adjusted between 1.25V

and 16V. The regulator supplies up to 350mA, with a

typical dropout of 650mV for the MAX1658 and 490mV for

the MAX1659. With their p-channel MOSFET pass transis-

tor, these devices maintain a low quiescent current from

zero output current to the full 350mA, even in dropout.

They support input voltages ranging from 2.7V to 16.5V.

The MAX1658/MAX1659 feature a 1μA shutdown mode,

reverse-battery protection, short-circuit protection, and

thermal shutdown. They are available in a special high-

power (1.2W), 8-pin SO package designed specifically for

compact applications.

Applications

● Digital Cordless Phones

● PCS Phones

● Cellular Phones

● PCMCIA Cards

● Modems

● Hand-Held Instruments

● Palmtop Computers

● Electronic Planners

Features

● Wide Input Voltage Range: 2.7V to 16.5V

● Low, 490mV Dropout at 350mA Output Current

(MAX1659)

● 30μA Supply Current

● 1μA Max Shutdown Current

● High-Power (1.2W) 8-Pin SO Package

● Dual Mode Operation Output:

• Fixed 3.3V (MAX1658)

• Fixed 5.0V (MAX1659)

or Adjustable (1.25V to 16V)

● Thermal-Overload Protection

● Current-Limit Protection

● Reverse-Battery Protection

Dual Mode is a trademark of Maxim Integrated Products.

19-1263; Rev 1; 5/14

*Dice are tested at T

= +25°C, DC parameters only.

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

PART TEMP RANGE PIN-PACKAGE

MAX1658C/D 0°C to +70°C Dice*

MAX1658ESA+ -40°C to +85°C 8 SO

MAX1659C/D 0°C to +70°C Dice*

MAX1659ESA+ -40°C to +85°C 8 SO

SHDN

OFF

INPUT

UP TO 16.5V

OUTPUT

3.3V OR 5V,

OR ADJ. (DOWN TO 1.25V);

UP TO 350mA

GND SET

OUT

MAX1658

MAX1659

OUTOUT

GND

INSHDN

SET

TOP VIEW

MAX1658

MAX1659

MAX1658/MAX1659 350mA, 16.5V Input,

Low-Dropout Linear Regulators

Typical Operating Circuit Pin Conguration

Ordering Information

Summary of content (10 pages)

PAGE 1
MAX1658/MAX1659 350mA, 16.5V Input, Low-Dropout Linear Regulators General Description The MAX1658/MAX1659 linear regulators maximize battery life by combining ultra-low supply currents and low-dropout voltages. They feature Dual Mode™ operation, which presets the output to 3.3V (MAX1658) or 5V (MAX1659), or permits it to be adjusted between 1.25V and 16V. The regulator supplies up to 350mA, with a typical dropout of 650mV for the MAX1658 and 490mV for the MAX1659.
PAGE 2
MAX1658/MAX1659 350mA, 16.5V Input, Low-Dropout Linear Regulators Absolute Maximum Ratings IN to GND................................................................-17V to +17V Continuous Output Current...............................................500mA Output Short-Circuit Duration............................................ Infinite SET, SHDN to GND................................................-17V to +17V OUT to GND............................................... -0.3V to (VIN + 0.
PAGE 3
MAX1658/MAX1659 350mA, 16.5V Input, Low-Dropout Linear Regulators Electrical Characteristics (continued) (VIN = 5V (MAX1658), VIN = 6V (MAX1659); COUT = 10μF; SHDN = IN; TA = TMIN to TMAX; unless otherwise noted. Typical values are at TA = +25°C.) (Note 2) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS 1.174 V SET INPUT SET Reference Voltage VSET SET Input Leakage Current ISET IOUT = 10μA (Note 3) 1.210 1.246 TA = +25°C (Note 3) 0.01 0.025 TA = +85°C (Note 3) 0.
PAGE 4
MAX1658/MAX1659 350mA, 16.5V Input, Low-Dropout Linear Regulators Typical Operating Characteristics (continued) (VIN = 5V (MAX1658), VIN = 6V (MAX1659); SHDN = IN; SET = GND; CIN = 0.1μF; COUT = 10μF tantalum; TA = +25°C; unless otherwise noted.) NORMALIZED OUTPUT VOLTAGE vs. LOAD CURRENT 5V OUTPUT 0.994 3.3V OUTPUT 0.
PAGE 5
MAX1658/MAX1659 350mA, 16.5V Input, Low-Dropout Linear Regulators Typical Operating Characteristics (continued) (VIN = 5V (MAX1658), VIN = 6V (MAX1659); SHDN = IN; SET = GND; CIN = 0.1μF; COUT = 10μF tantalum; TA = +25°C; unless otherwise noted.) MAX1658 OVERSHOOT AND TIME EXITING SHUTDOWN MAX1659 OVERSHOOT AND TIME EXITING SHUTDOWN MAX1658/59 toc14 MAX1658/59TOC15 3.
PAGE 6
MAX1658/MAX1659 350mA, 16.5V Input, Low-Dropout Linear Regulators IN SHDN THERMAL SENSOR P 1.21V REFERENCE ERROR AMPLIFIER MOSFET DRIVER WITH CURRENT LIMIT P OUT R1 SET R2 MAX1658 MAX1659 DUAL-MODE COMPARATOR 65mV GND Figure 1. Functional Diagram Detailed Description The MAX1658/MAX1659 are micropower, low-dropout linear regulators featuring Dual Mode operation, which allows them to deliver an adjustable (1.25V to 16.5V) or preset (3.3V for the MAX1658, 5V for MAX1659) output.
PAGE 7
MAX1658/MAX1659 350mA, 16.5V Input, Low-Dropout Linear Regulators P-Channel Pass Transistor The MAX1658/MAX1659 feature an internal p-channel MOSFET pass transistor. Using a MOSFET provides several advantages over similar pnp designs, including lower dropout voltage and extended battery life. Unlike bipolar transistors, MOSFETs reduce quiescent current, because they require no base current, particularly at heavy loads and in dropout.
PAGE 8
MAX1658/MAX1659 350mA, 16.5V Input, Low-Dropout Linear Regulators Thermal-Overload Protection Operating Region and Power Dissipation Maximum power dissipation of the MAX1658/MAX1659 depends on the thermal resistance of the package and circuit board, the temperature difference between the die and ambient air, and the rate of air flow. The power dissipation by the device is P = IOUT (VIN - VOUT).
PAGE 9
MAX1658/MAX1659 350mA, 16.5V Input, Low-Dropout Linear Regulators Applications Information Input Bypass Capacitor Output Capacitor Selection and Stability To maintain stability, connect a ≥10μF capacitor with less than 200mΩ equivalent series resistance (ESR) from OUT to GND. Larger output capacitors improve loadtransient response. Currents lower than 350mA make the use of smaller output capacitors possible. Table 1 shows the maximum output current typically achieved using various output capacitors.
PAGE 10
MAX1658/MAX1659 350mA, 16.5V Input, Low-Dropout Linear Regulators Revision History REVISION NUMBER REVISION DATE 1 5/14 PAGES CHANGED DESCRIPTION Added lead(Pb)-free OPNs to Ordering Information and rebranded data sheet 1–12 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.