MAX1649 Maxim, MAX1649 Datasheet
MAX1649
Manufacturer Part Number
MAX1649
Description
5V/3.3V or Adjustable / High-Efficiency / Low-Dropout / Step-Down DC-DC Controllers
Manufacturer
Maxim
Datasheet
1.MAX1649.pdf
(12 pages)
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The MAX1649/MAX1651 BiCMOS, step-down, DC-DC
switching controllers provide high efficiency over loads
ranging from 1mA to more than 2.5A. A unique, current-
limited pulse-frequency-modulated (PFM) control scheme
gives these devices the benefits of pulse-width-modula-
tion (PWM) converters (high efficiency at heavy loads),
while using only 100µA of supply current (vs. 2mA to
10mA for PWM converters). Dropout performance down
to 300mV is provided by a high switch duty cycle (96.5%)
and a low current-sense threshold (110mV).
A high switching frequency (up to 300kHz) allows these
devices to use miniature external components.
The MAX1649/MAX1651 have dropout voltages less
than 0.3V at 500mA and accept input voltages up to
16V. Output voltages are preset at 5V (MAX1649), or
3.3V (MAX1651). They 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 12.5W. 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
19-0305; Rev 2; 9/95
Call toll free 1-800-998-8800 for free samples or literature.
__________Typical Operating Circuit
_______________General Description
ON/OFF
3.6V TO 16V
PDAs
High-Efficiency Step-Down Regulation
5V-to-3.3V Green PC Applications
Battery-Powered Applications
INPUT
Low-Dropout, Step-Down DC-DC Controllers
SHDN
REF
FB
MAX1651
________________________________________________________________ Maxim Integrated Products
GND
5V/3.3V or Adjustable, High-Efficiency,
OUT
EXT
V+
CS
P
OUTPUT
3.3V
____________________________Features
* Dice are tested at T
______________Ordering Information
__________________Pin Configuration
MAX1649CPA
MAX1649CSA
MAX1649C/D
MAX1649EPA
MAX1649ESA
MAX1651CPA
MAX1651CSA
MAX1651C/D
MAX1651EPA
MAX1651ESA
More than 90% Efficiency (10mA to 1.5A Loads)
More than 12.5W Output Power
Less than 0.3V Dropout Voltage at 500mA
100µA Max Quiescent Supply Current
5µA Max Shutdown Supply Current
16V Max Input Voltage
5V (MAX1649), 3.3V (MAX1651), or Adjustable
Output Voltage
Current-Limited Control Scheme
Up to 300kHz Switching Frequency
Up to 96.5% Duty Cycle
TOP VIEW
PART
SHDN
OUT
REF
FB
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
A
TEMP. RANGE
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
= +25°C.
1
2
3
4
MAX1649
MAX1651
DIP/SO
8
7
6
5
8 Plastic DIP
8 SO
Dice*
8 Plastic DIP
8 SO
8 Plastic DIP
8 SO
Dice*
8 Plastic DIP
8 SO
PIN-PACKAGE
GND
EXT
CS
V+
1
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