Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsPMICsPMIC - LDO voltage regulator Positive, fixed or adjustable TSSOP 16 EP

General Description

The MAX1793 low-dropout linear regulator (LDO) oper-

ates from +2.5V to +5.5V and delivers a guaranteed 1A

load current with a low 210mV dropout. The high-accu-

racy (±1%) output voltage is preset at an internally

trimmed voltage (see the

Ordering Information

) or can

be adjusted from 1.25V to 5.0V with an external resis-

tor-divider.

An internal pMOS pass transistor allows a low 125µA

supply current, making the MAX1793 ideal for battery-

operated portable equipment. Other features include a

built-in reset output, low-power shutdown, and short-cir-

cuit and thermal-overload protection. The MAX1793 is

available in a 1.5W, 16-pin power TSSOP package,

which is 30% smaller than a SOT223 package and only

1.1mm high.

________________________Applications

Notebook Computers

Cordless Telephones

Cellular Phones

Modems

Handheld Instruments

PDAs and Palmtop Computers

Features

o Guaranteed 1A Output Current

o Low 210mV Dropout at 1A

o Up to ±1% Output Voltage Accuracy

Preset at 1.5V, 1.8V, 2.0V, 2.5V, 3.3V or 5.0V

Adjustable from 1.25V to 5.0V

o Reset Output (4ms Delay)

o Low 125µA Ground Current

o 0.1µA Shutdown

o Low 115µV

RMS

Output Noise

o Thermal-Overload Protection

o Output Current Limit

o Tiny TSSOP Power Package (1.5W)

30% Smaller than SOT223 (only 1.1mm high)

MAX1793

Low-Dropout, Low I

, 1A Linear Regulator

________________________________________________________________

Maxim Integrated Products

N.C. N.C.

OUT

SET

GND

N.C.

TOP VIEW

MAX1793

TSSOP

RST

SHDN

N.C.

Pin Configuration

MAX1793

OFF

SHDN

OUT

RST

SET

GND

OUT

RESET

OUTPUT

Typical Operating Circuit

19-1654; Rev 3; 1/12

Ordering Information

Ordering Information continued at end of data sheet

EP = Exposed pad.

†

Contact factory for other preset output voltages.

/V Denotes an automotive qualified part.

Note: Devices are also available in a lead(Pb)-free/RoHS-

compliant package. Specify lead-free by adding “+” to the part

number when ordering.

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

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

PART

TEMP

RANGE

PIN-

PACKAGE

OUT

†

( V)

MAX1793EUE-50 - 40°C to + 85°C 16 TSSOP-EP* 5.0 or Adj

MAX1793EUE-33 - 40°C to + 85°C 16 TSSOP-EP* 3.3 or Adj

MAX1793EUE-33/V - 40°C to + 85°C 16 TSSOP-EP* 3.3 or Adj

Summary of content (11 pages)

PAGE 1
9-1654; Rev 3; 1/12 Low-Dropout, Low IQ, 1A Linear Regulator Features o Guaranteed 1A Output Current o Low 210mV Dropout at 1A o Up to ±1% Output Voltage Accuracy Preset at 1.5V, 1.8V, 2.0V, 2.5V, 3.3V or 5.0V Adjustable from 1.25V to 5.0V o Reset Output (4ms Delay) o Low 125µA Ground Current o 0.1µA Shutdown o Low 115µVRMS Output Noise o Thermal-Overload Protection o Output Current Limit o Tiny TSSOP Power Package (1.5W) 30% Smaller than SOT223 (only 1.
PAGE 2
MAX1793 Low-Dropout, Low IQ, 1A Linear Regulator ABSOLUTE MAXIMUM RATINGS IN, SHDN, RST to GND ............................................-0.3V to +6V OUT, SET to GND ........................................-0.3V to (VIN + 0.3V) Output Short-Circuit Duration ............................................Infinite Continuous Power Dissipation (TA = +70°C) TSSOP-EP (derate 19mW/°C above +70°C) .....................1.5W Operating Temperature Range ...........................-40°C to +85°C Junction Temperature .
PAGE 3
Low-Dropout, Low IQ, 1A Linear Regulator (VIN = VOUT(NOM) + 0.5V or VIN = 2.5V (whichever is greater), SHDN = IN, TA = +0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER SYMBOL CONDITIONS VIH VIL +2.5V < VIN < +5.5V SHDN Input Bias Current I SHDN SHDN = GND or IN RST Output Low Voltage VOL SHDN Input Threshold MIN TYP MAX 0.01 0.6 1 µA 0.1 V 5.5 V 0.01 1 µA 1.
PAGE 4
ELECTRICAL CHARACTERISTICS (continued) (VIN = VOUT(NOM) + 0.5V or VIN = 2.5V (whichever is greater), SHDN = IN, TA = -40°C to +85°C, unless otherwise noted.) (Note 2) PARAMETER SYMBOL CONDITIONS Operating Voltage Range for RST Valid ISINK = 10µA RST Output High Leakage V RST = +5.5V RST Trip Level Referred to Nominal VOUT Rising edge RST Release Delay Rising edge MIN TYP 1.0 MAX UNITS 5.5 V 1 µA 90 96 % VOUT 1.5 8.
PAGE 5
Low-Dropout, Low IQ, 1A Linear Regulator POWER-SUPPLY REJECTION RATIO vs. FREQUENCY IOUT = 250mA 50 PSRR (dB) 150 NOISE (µV/√Hz) 40 200 30 100 20 50 10 10 400 600 0.01 0.01 800 1000 1200 LOAD CURRENT (mA) 0.1 0.1 1 10 100 1000 0.01 0.1 FREQUENCY (kHz) 1 10 100 1000 FREQUENCY (kHz) OUTPUT NOISE vs.
PAGE 6
MAX1793 Low-Dropout, Low IQ, 1A Linear Regulator Typical Operating Characteristics (continued) (Circuit of Figure 2, VIN = +5V, V SHDN = VIN, VOUT = +3.3V, TA = +25°C, unless otherwise noted.) RESET OUTPUT RESPONSE SHUTDOWN RESPONSE MAX1793 toc15 MAX1793 toc14 VOUT VIN 5V/div VOUT 2V/div RST 2V/div 2V/div VSHDN 5V/div IOUT = 100mA 1ms/div 40µs/div Pin Description 6 PIN NAME FUNCTION 1, 8, 9, 16 N.C. 2–5 IN 6 RST Reset Output.
PAGE 7
Low-Dropout, Low IQ, 1A Linear Regulator The MAX1793 features Dual Mode™ operation, allowing a fixed output or an adjustable output from +1.25V to +5V. The regulators are guaranteed to supply 1A of output current. As Figure 1 shows, the device consists of a +1.25V reference, error amplifier, MOSFET driver, p-channel pass transistor, internal feedback voltage-divider, Dual Mode comparator, and 4ms reset output. The +1.25V reference is connected to the inverting input of the error amplifier.
PAGE 8
MAX1793 Low-Dropout, Low IQ, 1A Linear Regulator Internal p-Channel Pass Transistor Shutdown The MAX1793 features a 1A p-channel MOSFET pass transistor. Unlike similar designs using pnp pass transistors, p-channel MOSFETs require no base drive, which reduces quiescent current. pnp-based regulators also waste considerable current in dropout when the pass transistor saturates and use high base-drive currents under large loads.
PAGE 9
Low-Dropout, Low IQ, 1A Linear Regulator PMAX = [(TJ(MAX) – TA)/(θJC + θCA)] 2.0 MAXIMUM CONTINUOUS CURRENT 1.8 1.6 TA = +25°C 1.4 1.2 1.0 0.8 0.6 TA = +50°C 0.4 TA = +70°C 0.2 where (T J(MAX) – T A ) is the temperature difference between the maximum allowed die junction (+150°C) and the surrounding air, θJC (junction-to-case) is the thermal resistance of the package chosen, and θCA is the thermal resistance from the case through the PCB, copper traces, and other materials to the surrounding air.
PAGE 10
MAX1793 Low-Dropout, Low IQ, 1A Linear Regulator Package Information Ordering Information (continued) PART TEMP RANGE PINPACKAGE VOUT† (V) MAX1793EUE-25 -40°C to +85°C 16 TSSOP-EP* 2.5 or Adj MAX1793EUE-20 -40°C to +85°C 16 TSSOP-EP* 2.0 or Adj MAX1793EUE-18 -40°C to +85°C 16 TSSOP-EP* 1.8 or Adj MAX1793EUE-15 -40°C to +85°C 16 TSSOP-EP* 1.5 or Adj *EP = Exposed pad. †Contact factory for other preset output voltages. /V Denotes an automotive qualified part.
PAGE 11
Low-Dropout, Low IQ, 1A Linear Regulator REVISION NUMBER REVISION DATE DESCRIPTION 0 8/00 Initial release 1 11/00 Added output voltages and updated Electrical Characteristics. 2 9/09 Added the automotive version of the MAX1793. 3 1/12 Added lead-free options and updated soldering temperature and Pin Description PAGES CHANGED — 1–4, 7–9 1 1, 2, 6, 10 Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product.