Datasheet

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General Description

The MAX4245/MAX4246/MAX4247 family of low-cost op

amps offer rail-to-rail inputs and outputs, draw only 320µA

of quiescent current, and operate from a single +2.5V

to +5.5V supply. For additional power conservation, the

MAX4245/MAX4247 offer a low-power shutdown mode

that reduces supply current to 50nA, and puts the ampli-

fiers outputs in a high-impedance state. These devices

are unity-gain stable with a 1MHz gain-bandwidth prod

uct driving capacitive loads up to 470pF.

The MAX4245/MAX4246/MAX4247 family is specified

from -40°C to +125°C, making them suitable for use in

a variety of harsh environments. The MAX4245 single

amplifier is available in ultra-small 6-pin SC70 and space-

saving 6-pin SOT23 packages. The MAX4246 dual

amplifier is available in 8-pin SOT23, SO, and µMAX

packages. The MAX4247 dual amplifier comes in a tiny

10-pin µMAX package.

Applications

● Portable Communications

● Single-Supply Zero-Crossing Detectors

● Instruments and Terminals

● Electronic Ignition Modules

● Infrared Receivers

● Sensor-Signal Detection

Features

● Rail-to-Rail Input and Output Voltage Swing

● 50nA (max) Shutdown Mode (MAX4245/MAX4247)

● 320µA (typ) Quiescent Current Per Amplifier

● Single +2.5V to +5.5V Supply Voltage Range

● 110dB Open-Loop Gain with 2kΩ Load

● 0.01% THD with 100kΩ Load

● Unity-Gain Stable up to C

LOAD

= 470pF

● No Phase Inversion for Overdriven Inputs

● Available in Space-Saving Packages

6-Pin SC70 or 6-Pin SOT23 (MAX4245)

8-Pin SOT23/SO or 8-Pin µMAX (MAX4246)

10-Pin µMAX (MAX4247)

Pin Configurations continued at end of datat sheet.

19-2016; Rev 3; 5/14

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

T = Tape and reel.

μMAX is a registered trademark of Maxim Integrated Products, Inc.

PART TEMP RANGE

PIN-

PACKAGE

TOP

MARK

MAX4245AXT+T -40°C to +125°C 6 SC70 AAZ

MAX4245AUT+T -40°C to +125°C 6 SOT23 AAUB

MAX4246AKA+T -40°C to +125°C 8 SOT23 AAIN

MAX4246ASA+T -40°C to +125°C 8 SO —

MAX4246AUA+T -40°C to +125°C 8 µMAX —

MAX4247AUB+T -40°C to +125°C 10 µMAX —

PART

AMPLIFIERS

PER PACKAGE

SHUTDOWN

MODE

MAX4245AXT 1 Yes

MAX4245AUT 1 Yes

MAX4246AKA 2 No

MAX4246ASA 2 No

MAX4246AUA 2 No

MAX4247AUB 2 Yes

OUTIN-

1 6 V

IN+

MAX4245

SC70-6/SOT23-6

TOP VIEW

3 4

OUTB

INB-

INB+V

INA+

INA-

OUTA

MAX4246

SOT23-8/µMAX-8

SHDN

MAX4245/MAX4246/

MAX4247

Ultra-Small, Rail-to-Rail I/O with Disable,

Single-/Dual-Supply, Low-Power Op Amps

Ordering Information

Selector Guide

Pin Congurations

Summary of content (11 pages)

PAGE 1
MAX4245/MAX4246/ MAX4247 Ultra-Small, Rail-to-Rail I/O with Disable, Single-/Dual-Supply, Low-Power Op Amps General Description The MAX4245/MAX4246/MAX4247 family of low-cost op amps offer rail-to-rail inputs and outputs, draw only 320µA of quiescent current, and operate from a single +2.5V to +5.5V supply. For additional power conservation, the MAX4245/MAX4247 offer a low-power shutdown mode that reduces supply current to 50nA, and puts the amplifiers outputs in a high-impedance state.
PAGE 2
MAX4245/MAX4246/ MAX4247 Ultra-Small, Rail-to-Rail I/O with Disable, Single-/Dual-Supply, Low-Power Op Amps Absolute Maximum Ratings Power-Supply Voltage (VDD to VSS)........................-0.3V to +6V All Other Pins................................. (VSS - 0.3V) to (VDD + 0.3V) Output Short-Circuit Duration (OUT shorted to VSS or VDD)............................... Continuous Continuous Power Dissipation (TA = +70°C) 6-Pin SC70 (derate 3.1mW/°C above +70°C)..............245mW 6-Pin SOT23 (derate 8.
PAGE 3
MAX4245/MAX4246/ MAX4247 Ultra-Small, Rail-to-Rail I/O with Disable, Single-/Dual-Supply, Low-Power Op Amps Electrical Characteristics (continued) (VDD = +2.7V, VSS = 0V, VCM = 0V, VOUT = VDD/2, RL connected from OUT to VDD / 2, SHDN_ = VDD (MAX4245/MAX4247 only), TA = +25°C, unless otherwise noted.) (Note 1) PARAMETER SYMBOL Gain-Bandwidth Product CONDITIONS MIN GBW TYP MAX UNITS 1.0 MHz Phase Margin ΦM 70 degrees Gain Margin GM 20 dB Slew Rate SR 0.
PAGE 4
MAX4245/MAX4246/ MAX4247 Ultra-Small, Rail-to-Rail I/O with Disable, Single-/Dual-Supply, Low-Power Op Amps Electrical Characteristics (continued) (VDD = +2.7V, VSS = 0V, VCM = 0V, VOUT = VDD/2, RL connected from OUT to VDD / 2, SHDN_ = VDD (MAX4245/MAX4247 only), TA = +25°C, unless otherwise noted.
PAGE 5
MAX4245/MAX4246/ MAX4247 Ultra-Small, Rail-to-Rail I/O with Disable, Single-/Dual-Supply, Low-Power Op Amps Typical Operating Characteristics (VDD = 2.7V, VSS = VCM = 0V, VOUT = VDD / 2, no load, TA = +25°C, unless otherwise noted.) 35 8 30 6 25 VDD = 2.5V 0 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 0 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 70 125 OUTPUT SWING LOW vs. TEMPERATURE CROSSTALK vs. FREQUENCY POWER-SUPPLY REJECTION RATIO vs.
PAGE 6
MAX4245/MAX4246/ MAX4247 Ultra-Small, Rail-to-Rail I/O with Disable, Single-/Dual-Supply, Low-Power Op Amps Typical Operating Characteristics (continued) (VDD = 2.7V, VSS = VCM = 0V, VOUT = VDD / 2, no load, TA = +25°C, unless otherwise noted.) MAX4245 toc16 60 30 40 -30 IN 20mV/div -150 -20 -40 0.1 20mV/div -90 PHASE GAIN 0 MAX4245 toc17 90 2kΩ || 470pF 20 SMALL-SIGNAL TRANSIENT RESPONSE (NONINVERTING) PHASE (deg) GAIN (dB) 80 GAIN AND PHASE vs.
PAGE 7
MAX4245/MAX4246/ MAX4247 Ultra-Small, Rail-to-Rail I/O with Disable, Single-/Dual-Supply, Low-Power Op Amps Pin Description PIN NAME FUNCTION MAX4245 MAX4246 MAX4247 1 — — IN+ Noninverting Input 2 4 4 VSS Ground or Negative Supply 3 — — IN- Inverting Input 4 — — OUT 5 — — SHDN 6 8 10 VDD — 1 1 OUTA — 2 2 INA- Inverting Input Channel A — 3 3 INA+ Noninverting Input Channel A — 5 7 INB+ Noninverting Input Channel B — 6 8 INB- Inverting Input Channel B
PAGE 8
MAX4245/MAX4246/ MAX4247 IN- IN+ Ultra-Small, Rail-to-Rail I/O with Disable, Single-/Dual-Supply, Low-Power Op Amps 5.3kΩ 5.3kΩ IN 2V/div OUT 2V/div Figure 2. Input Protection Circuit much less than 2.1V (triple-diode drop), input resistance is typically 4MΩ. For differential voltages greater than 2.1V, input resistance is around 10.6kΩ, and the input bias current can be approximated by the following equation: 400µs/div Figure 3. Rail-to-Rail Input/Output Voltage Range IB = (VDIFF - 2.1V)/10.
PAGE 9
MAX4245/MAX4246/ MAX4247 Ultra-Small, Rail-to-Rail I/O with Disable, Single-/Dual-Supply, Low-Power Op Amps 2V/div SHDN RISO IN OUT RL CL 2V/div Figure 6a. Using a Resistor to Isolate a Capacitive Load from the Op Amp OUT 400µs/div RISO = 0Ω RL = 2kΩ CL = 2200pF Figure 5. Shutdown Waveform between the output and the capacitive load (Figures 6a, 6b, 6c). Note that this alternative results in a loss of gain accuracy because RISO forms a voltage divider with the RLOAD.
PAGE 10
MAX4245/MAX4246/ MAX4247 Ultra-Small, Rail-to-Rail I/O with Disable, Single-/Dual-Supply, Low-Power Op Amps Package Information For the latest package outline information and land patterns (footprints), go to www.maximintegrated.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 DOCUMENT NO. LAND PATTERN NO.
PAGE 11
MAX4245/MAX4246/ MAX4247 Ultra-Small, Rail-to-Rail I/O with Disable, Single-/Dual-Supply, Low-Power Op Amps Revision History REVISION NUMBER REVISION DATE DESCRIPTION PAGES CHANGED 0 5/01 Initial release — 2 11/11 Added lead-free data to Ordering Information. 1 3 5/14 Updated the General Description. 1 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.