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MAX8742EAI-

Description
Current & Power Monitors & Regulators 500kHz Multi-Out Pwr Supply Controller
Categorysemiconductor    Power management   
File Size399KB,34 Pages
ManufacturerMaxim
Websitehttps://www.maximintegrated.com/en.html
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MAX8742EAI- Overview

Current & Power Monitors & Regulators 500kHz Multi-Out Pwr Supply Controller

MAX8742EAI- Parametric

Parameter NameAttribute value
Product AttributeAttribute Value
ManufacturerMaxim
Product CategoryCurrent & Power Monitors & Regulators
RoHSDetails
ProductPower Monitors
Sensing MethodHigh or Low Side
Supply Voltage - Max30 V
Supply Voltage - Min4.2 V
Operating Supply Current50 uA
Minimum Operating Temperature- 40 C
Maximum Operating Temperature+ 85 C
Mounting StyleSMD/SMT
Package / CaseSSOP-28
PackagingTube
Input Voltage Range4.2 V to 30 V
Factory Pack Quantity46
Unit Weight0.025045 oz
19-3262; Rev 1; 8/05
500kHz Multi-Output Power-Supply Controllers
with High Impedance in Shutdown
MAX8741/MAX8742
General Description
The MAX8741/MAX8742 are buck-topology, step-down,
switch-mode, power-supply controllers that generate
logic-supply voltages in battery-powered systems. These
high-performance, dual/triple-output devices include on-
board power-up sequencing, power-good signaling with
delay, digital soft-start, secondary winding control, low-
dropout circuitry, internal frequency-compensation net-
works, and automatic bootstrapping.
Up to 97% efficiency is achieved through synchronous
rectification and Maxim’s proprietary Idle Mode™ control
scheme. Efficiency is greater than 80% over a 1000:1
load-current range, which extends battery life in system
suspend or standby mode. Excellent dynamic response
corrects output load transients within five clock cycles.
Strong 1A on-board gate drivers ensure fast external
n-channel MOSFET switching.
These devices feature a logic-controlled and synchroniz-
able, fixed-frequency, pulse-width-modulation (PWM)
operating mode. This reduces noise and RF interference
in sensitive mobile communications and pen-entry appli-
cations. Asserting the
SKIP
pin enables fixed-frequency
mode, for lowest noise under all load conditions.
The MAX8741/MAX8742 include two PWM regulators,
adjustable from 2.5V to 5.5V with fixed 5.0V and 3.3V
modes. All these devices include secondary feedback
regulation, and the MAX8742 contains a 12V/120mA lin-
ear regulator. The MAX8741 includes a secondary feed-
back input (SECFB), plus a control pin (STEER) that
selects which PWM (3.3V or 5V) receives the secondary
feedback signal. SECFB provides a method for adjusting
the secondary winding voltage regulation point with an
external resistor-divider, and is intended to aid in creating
auxiliary voltages other than fixed 12V.
The MAX8741/MAX8742 contain internal output overvolt-
age- and undervoltage-protection features.
Features
97% Efficiency
4.2V to 30V Input Range
2.5V to 5.5V Dual Adjustable Outputs
Selectable 3.3V and 5V Fixed or Adjustable
Outputs (Dual Mode™)
12V Linear Regulator
Adjustable Secondary Feedback (MAX8741)
5V/50mA Linear-Regulator Output
Precision 2.5V Reference Output
Programmable Power-Up Sequencing
Power-Good (RESET) Output
Output Overvoltage Protection
Output Undervoltage Shutdown
333kHz/500kHz Low-Noise, Fixed-Frequency
Operation
Low-Dropout, 98% Duty-Factor Operation
2.5mW Typical Quiescent Power (12V Input,
Both SMPSs On)
4µA Typical Shutdown Current
Ordering Information
PART
MAX8741EAI
MAX8741EAI+
MAX8741ETJ
MAX8741ETJ+
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
28 SSOP
28 SSOP
32 Thin QFN 5mm x 5mm
32 Thin QFN 5mm x 5mm
+Denotes
lead-free package.
Ordering Information continued at end of data sheet.
Functional Diagram
INPUT
5V (RTC)
5V
LINEAR
12V
LINEAR
12V
________________________Applications
Notebook and Subnotebook Computers
PDAs and Mobile Communicators
Desktop CPU Local DC-DC Converters
3.3V
3.3V
SMPS
5V
SMPS
5V
Idle Mode is a trademark of Maxim Integrated Products, Inc.
Dual Mode is a trademark of Maxim Integrated Products, Inc.
Pin Configurations appear at end of data sheet.
ON/OFF
POWER-UP
SEQUENCE
POWER-
GOOD
RESET
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

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MAX8742EAI- MAX8742EAI-T MAX8741EAI
Description Current & Power Monitors & Regulators 500kHz Multi-Out Pwr Supply Controller Current & Power Monitors & Regulators 500kHz Multi-Out Pwr Supply Controller Current & Power Monitors & Regulators
Is it lead-free? - Contains lead Contains lead
Is it Rohs certified? - incompatible incompatible
Parts packaging code - SSOP SSOP
package instruction - 5.3 MM, MO-150, SSOP-28 5.3 MM, MO-150, SSOP-28
Contacts - 28 28
Reach Compliance Code - not_compliant not_compliant
ECCN code - EAR99 EAR99
Is Samacsys - N N
Analog Integrated Circuits - Other Types - DUAL SWITCHING CONTROLLER DUAL SWITCHING CONTROLLER
control mode - CURRENT-MODE CURRENT-MODE
Control Technology - PULSE WIDTH MODULATION PULSE WIDTH MODULATION
Maximum input voltage - 30 V 30 V
Minimum input voltage - 4.2 V 4.2 V
Nominal input voltage - 15 V 15 V
JESD-30 code - R-PDSO-G28 R-PDSO-G28
JESD-609 code - e0 e0
length - 10.2 mm 10.2 mm
Humidity sensitivity level - 1 1
Number of functions - 1 1
Number of terminals - 28 28
Maximum operating temperature - 85 °C 85 °C
Minimum operating temperature - -40 °C -40 °C
Package body material - PLASTIC/EPOXY PLASTIC/EPOXY
encapsulated code - SSOP SSOP
Encapsulate equivalent code - SSOP28,.3 SSOP28,.3
Package shape - RECTANGULAR RECTANGULAR
Package form - SMALL OUTLINE, SHRINK PITCH SMALL OUTLINE, SHRINK PITCH
Peak Reflow Temperature (Celsius) - 245 245
Certification status - Not Qualified Not Qualified
Maximum seat height - 1.99 mm 1.99 mm
surface mount - YES YES
Switch configuration - PUSH-PULL PUSH-PULL
Maximum switching frequency - 550 kHz 550 kHz
technology - BICMOS BICMOS
Temperature level - INDUSTRIAL INDUSTRIAL
Terminal surface - Tin/Lead (Sn/Pb) Tin/Lead (Sn/Pb)
Terminal form - GULL WING GULL WING
Terminal pitch - 0.65 mm 0.65 mm
Terminal location - DUAL DUAL
Maximum time at peak reflow temperature - NOT SPECIFIED NOT SPECIFIED
width - 5.29 mm 5.29 mm
Base Number Matches - 1 1
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