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MAX651MSA-PR-T

Description
Switching Controllers 5V/3.3V/3V or Adjustable, High-Efficiency, Low-IQ, Step-Down DC-DC Controller
Categorysemiconductor    Power management   
File Size265KB,16 Pages
ManufacturerMaxim
Websitehttps://www.maximintegrated.com/en.html
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MAX651MSA-PR-T Overview

Switching Controllers 5V/3.3V/3V or Adjustable, High-Efficiency, Low-IQ, Step-Down DC-DC Controller

MAX651MSA-PR-T Parametric

Parameter NameAttribute value
Product CategorySwitching Controllers
ManufacturerMaxim
Number of Outputs1 Output
Input Voltage4 V to 16.5 V
Output Voltage3.3 V
Output Current1 A
TypeStep Down
19-0225; Rev 3; 9/97
KIT
ATION
EVALU
BLE
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
More than 90% Efficiency (10mA to 1.5A Loads)
o
More than 12.5W Output Power
o
100µA Max Quiescent Supply Current
o
5µA Max Shutdown Supply Current
o
Less than 1.0V Dropout Voltage
o
16.5V Max Input Voltage
o
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.
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