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MAX649

Description
5V/3.3V/3V or Adjustable, High-Efficiency,
File Size192KB,16 Pages
ManufacturerMaxim
Websitehttps://www.maximintegrated.com/en.html
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MAX649 Overview

5V/3.3V/3V or Adjustable, High-Efficiency,

19-0225; Rev 3; 9/97
KIT
ATION
EVALU
E
BL
AVAILA
5V/3.3V/3V or Adjustable, High-Efficiency,
Low I
Q
, Step-Down DC-DC Controllers
_______________General Description
The MAX649/MAX651/MAX652 BiCMOS, step-down DC-
DC switching controllers provide high efficiency over
three decades of load current. A unique, current-limited
pulse-frequency-modulated (PFM) control scheme gives
these devices the benefits of pulse-width-modulation
(PWM) converters (high efficiency at heavy loads), while
using only 100µA of supply current (vs. 2mA to 10mA for
PWM converters). The result is high efficiency over loads
ranging from 10mA to more than 2.5A.
These devices use miniature external components.
Their high switching frequency (up to 300kHz) allows
for less than 9mm diameter surface-mount inductors.
The MAX649/MAX651/MAX652 have dropout voltages
less than 1V and accept input voltages up to 16.5V.
Output voltages are preset at 5V (MAX649), 3.3V
(MAX651), and 3V (MAX652). These controllers can
also be adjusted to any voltage from 1.5V to the input
voltage by using two resistors.
These step-down controllers drive external P-channel
MOSFETs at loads greater than 10W. If less power is
required, use the MAX639/MAX640/MAX653 step-down
converters with on-chip FETs, which allow up to a
225mA load current.
____________________________Features
o
o
o
o
o
o
o
More than 90% Efficiency (10mA to 1.5A Loads)
More than 12.5W Output Power
100µA Max Quiescent Supply Current
5µA Max Shutdown Supply Current
Less than 1.0V Dropout Voltage
16.5V Max Input Voltage
5V (MAX649), 3.3V (MAX651), 3V (MAX652),
or Adjustable Output Voltage
o
Current-Limited Control Scheme
o
Up to 300kHz Switching Frequency
MAX649/MAX651/MAX652
______________Ordering Information
PART
MAX649CPA
MAX649CSA
MAX649C/D
MAX649EPA
MAX649ESA
MAX649MJA
TEMP. RANGE
0°C to +70°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
-55°C to +125°C
PIN-PACKAGE
8 Plastic DIP
8 SO
Dice*
8 Plastic DIP
8 SO
8 CERDIP**
________________________Applications
5V-to-3.3V Green PC Applications
High-Efficiency Step-Down Regulation
Minimum-Component DC-DC Converters
Battery-Powered Applications
Ordering Information continued at end of data sheet.
* Dice are tested at T
A
= +25°C.
**Contact factory for availability and processing to MIL-STD-883.
__________Typical Operating Circuit
INPUT
4V TO 16.5V
__________________Pin Configuration
TOP VIEW
V+
OUT
1
2
8
7
GND
EXT
CS
V+
MAX651
ON/OFF
SHDN
CS
EXT
P
OUTPUT
3.3V
FB
SHDN
3
REF
4
MAX649
MAX651
MAX652
6
5
REF
FB
GND
OUT
DIP/SO
________________________________________________________________
Maxim Integrated Products
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.

MAX649 Related Products

MAX649 MAX649-MAX652 MAX652ESA MAX652C/D MAX652 MAX651C/D MAX649C/D
Description 5V/3.3V/3V or Adjustable, High-Efficiency, 5V/3.3V/3V or Adjustable, High-Efficiency, 5V/3.3V/3V or Adjustable, High-Efficiency, 5V/3.3V/3V or Adjustable, High-Efficiency, 5V/3.3V/3V or Adjustable, High-Efficiency, 5V/3.3V/3V or Adjustable, High-Efficiency, 5V/3.3V/3V or Adjustable, High-Efficiency,
Is it lead-free? - - Contains lead Contains lead - Contains lead Contains lead
Is it Rohs certified? - - incompatible incompatible - incompatible incompatible
Maker - - Maxim Maxim - Maxim Maxim
Parts packaging code - - SOIC DIE - DIE DIE
package instruction - - 0.150 INCH, SOIC-8 DIE-9 - DIE-9 DIE-9
Contacts - - 8 9 - 9 9
Reach Compliance Code - - _compli _compli - _compli _compli
ECCN code - - EAR99 EAR99 - EAR99 EAR99
Analog Integrated Circuits - Other Types - - SWITCHING CONTROLLER SWITCHING CONTROLLER - SWITCHING CONTROLLER SWITCHING CONTROLLER
control mode - - CURRENT-MODE CURRENT-MODE - CURRENT-MODE CURRENT-MODE
Control Technology - - PULSE FREQUENCY MODULATION PULSE FREQUENCY MODULATION - PULSE FREQUENCY MODULATION PULSE FREQUENCY MODULATION
Maximum input voltage - - 16.5 V 16.5 V - 16.5 V 16.5 V
Minimum input voltage - - 4 V 4 V - 4 V 6 V
JESD-30 code - - R-PDSO-G8 R-XUUC-N9 - R-XUUC-N9 R-XUUC-N9
JESD-609 code - - e0 e0 - e0 e0
Humidity sensitivity level - - 1 1 - 1 1
Number of functions - - 1 1 - 1 1
Number of terminals - - 8 9 - 9 9
Maximum operating temperature - - 85 °C 70 °C - 70 °C 70 °C
Maximum output current - - 1.5 A 1.5 A - 1.5 A 1.5 A
Nominal output voltage - - 3 V 3 V - 3.3 V 5 V
Package body material - - PLASTIC/EPOXY UNSPECIFIED - UNSPECIFIED UNSPECIFIED
encapsulated code - - SOP DIE - DIE DIE
Encapsulate equivalent code - - SOP8(UNSPEC) DIE OR CHIP - DIE OR CHIP DIE OR CHIP
Package shape - - RECTANGULAR RECTANGULAR - RECTANGULAR RECTANGULAR
Package form - - SMALL OUTLINE UNCASED CHIP - UNCASED CHIP UNCASED CHIP
Peak Reflow Temperature (Celsius) - - 245 240 - 240 240
Certification status - - Not Qualified Not Qualified - Not Qualified Not Qualified
Maximum supply current (Isup) - - 0.1 mA 0.1 mA - 0.1 mA 0.1 mA
surface mount - - YES YES - YES YES
Switch configuration - - BUCK BUCK - BUCK BUCK
Maximum switching frequency - - 300 kHz 300 kHz - 300 kHz 300 kHz
technology - - BICMOS BICMOS - BICMOS BICMOS
Temperature level - - INDUSTRIAL COMMERCIAL - COMMERCIAL COMMERCIAL
Terminal surface - - Tin/Lead (Sn/Pb) TIN LEAD - Tin/Lead (Sn/Pb) Tin/Lead (Sn/Pb)
Terminal form - - GULL WING NO LEAD - NO LEAD NO LEAD
Terminal location - - DUAL UPPER - UPPER UPPER
Maximum time at peak reflow temperature - - NOT SPECIFIED NOT SPECIFIED - NOT SPECIFIED NOT SPECIFIED
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