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What is MAX651?

This electronic component, produced by the manufacturer "Maxim Integrated", performs the same function as "Step-Down DC-DC Controllers".


MAX651 Datasheet PDF - Maxim Integrated

Part Number MAX651
Description Step-Down DC-DC Controllers
Manufacturers Maxim Integrated 
Logo Maxim Integrated Logo 


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19-0225; Rev 3; 9/97
EVAALVUAAILTAIOBNLEKIT
5V/3.3V/3V or Adjustable, High-Efficiency,
Low IQ, 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.
________________________Applications
5V-to-3.3V Green PC Applications
High-Efficiency Step-Down Regulation
Minimum-Component DC-DC Converters
Battery-Powered Applications
____________________________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
______________Ordering Information
PART
TEMP. RANGE
PIN-PACKAGE
MAX649CPA
0°C to +70°C
8 Plastic DIP
MAX649CSA
0°C to +70°C
8 SO
MAX649C/D
0°C to +70°C
Dice*
MAX649EPA
-40°C to +85°C
8 Plastic DIP
MAX649ESA
-40°C to +85°C
8 SO
MAX649MJA
-55°C to +125°C 8 CERDIP**
Ordering Information continued at end of data sheet.
* Dice are tested at TA = +25°C.
**Contact factory for availability and processing to MIL-STD-883.
__________Typical Operating Circuit __________________Pin Configuration
INPUT
4V TO 16.5V
TOP VIEW
ON/OFF
V+
MAX651
SHDN
CS
EXT
REF OUT
FB GND
P
OUTPUT
3.3V
OUT 1
FB 2
SHDN 3
REF 4
MAX649
MAX651
MAX652
8 GND
7 EXT
6 CS
5 V+
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.
http://www.Datasheet4U.com

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MAX651 equivalent
5V/3.3V/3V or Adjustable, High-Efficiency,
Low IQ, Step-Down DC-DC Controllers
____________________________Typical Operating Characteristics (continued)
(TA = +25°C, unless otherwise noted.)
EXT RISE AND FALL TIMES
vs. TEMPERATURE (1nF)
130
120 CEXT = 1nF
V+ = 5V, tRISE
110
100
90
80 V+ = 5V, tFALL
70
60
50 V+ = 12V, tRISE
40
30
20
-60 -40 -20
V+ = 12V, tFALL
0 20 40 60 80 100 120 140
TEMPERATURE (°C)
EXT RISE AND FALL TIMES
vs. TEMPERATURE (5nF)
500
CEXT = 5nF
450
400 V+ = 5V, tRISE
350
300 V+ = 12V, tRISE
250
V+ = 5V, tFALL
200
150
100 V+ = 12V, tFALL
50
-60 -40 -20 0 20 40 60 80 100 120 140
TEMPERATURE (°C)
DROPOUT VOLTAGE
vs. LOAD CURRENT
1000
MAX649, VOUT = 5V
900 MAX652, VOUT = 3V
800
700
600 MAX651, VOUT = 3.3V
500
400
300
200
100
0
0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6
LOAD CURRENT (A)
DROPOUT VOLTAGE
vs. TEMPERATURE
1100
MAX649
1000
900 MAX652
800 MAX651
700
600
-60 -40 -20
ILOAD = 1A
CIRCUIT OF FIGURE 1
0 20 40 60 80 100 120 140
TEMPERATURE (°C)
CS TRIP LEVEL
vs. TEMPERATURE
235
230
225
220
215
210
205
200
195
190
185
-60 -40 -20 0 20 40 60 80 100 120 140
TEMPERATURE (°C)
REFERENCE OUTPUT RESISTANCE
vs. TEMPERATURE
250
REFERENCE OUTPUT VOLTAGE
vs. TEMPERATURE
1.506
1.504
1.502
1.500
1.498
1.496
1.494
1.492
-60 -40 -20 0 20 40 60 80 100 120 140
TEMPERATURE (°C)
200 IREF = 10µA
150
IREF = 50µA
100
50 IREF = 100µA
0
-60 -40 -20 0 20 40 60 80 100 120 140
TEMPERATURE (°C)
_______________________________________________________________________________________ 5
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Part Details

On this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for MAX651 electronic component.


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