MAX649 Maxim, MAX649 Datasheet
MAX649
Manufacturer Part Number
MAX649
Description
5V/3.3V/3V or Adjustable / High-Efficiency /
Manufacturer
Maxim
Datasheet
1.MAX649.pdf
(16 pages)
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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.
________________________Applications
19-0225; Rev 3; 9/97
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.
__________Typical Operating Circuit
_______________General Description
ON/OFF
4V TO 16.5V
5V-to-3.3V Green PC Applications
High-Efficiency Step-Down Regulation
Minimum-Component DC-DC Converters
Battery-Powered Applications
INPUT
SHDN
REF
5V/3.3V/3V or Adjustable, High-Efficiency,
FB
MAX651
________________________________________________________________ Maxim Integrated Products
GND
OUT
EXT
Low I
V+
CS
P
Q
, Step-Down DC-DC Controllers
OUTPUT
3.3V
____________________________Features
Ordering Information continued at end of data sheet.
* Dice are tested at T
**Contact factory for availability and processing to MIL-STD-883.
______________Ordering Information
__________________Pin Configuration
MAX649CPA
MAX649CSA
MAX649C/D
MAX649EPA
MAX649ESA
MAX649MJA
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
Current-Limited Control Scheme
Up to 300kHz Switching Frequency
TOP VIEW
PART
SHDN
OUT
REF
FB
A
-40°C to +85°C
-40°C to +85°C
-55°C to +125°C
TEMP. RANGE
= +25°C.
0°C to +70°C
0°C to +70°C
0°C to +70°C
1
2
3
4
MAX649
MAX651
MAX652
DIP/SO
8 Plastic DIP
8 SO
Dice*
8 Plastic DIP
8 SO
8 CERDIP**
8
7
6
5
PIN-PACKAGE
GND
EXT
CS
V+
1
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