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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1651 Datasheet

5V/3.3V or Adjustable / High-Efficiency / Low-Dropout / Step-Down DC-DC Controllers

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MAX1651 pdf
19-0305; Rev 2; 9/95
5V/3.3V or Adjustable, High-Efficiency,
Low-Dropout, Step-Down DC-DC Controllers
_______________General Description
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
PDAs
High-Efficiency Step-Down Regulation
5V-to-3.3V Green PC Applications
Battery-Powered Applications
__________Typical Operating Circuit
INPUT
3.6V TO 16V
____________________________Features
o More than 90% Efficiency (10mA to 1.5A Loads)
o More than 12.5W Output Power
o Less than 0.3V Dropout Voltage at 500mA
o 100µA Max Quiescent Supply Current
o 5µA Max Shutdown Supply Current
o 16V Max Input Voltage
o 5V (MAX1649), 3.3V (MAX1651), or Adjustable
Output Voltage
o Current-Limited Control Scheme
o Up to 300kHz Switching Frequency
o Up to 96.5% Duty Cycle
______________Ordering Information
PART
TEMP. RANGE
MAX1649CPA
0°C to +70°C
MAX1649CSA
0°C to +70°C
MAX1649C/D
0°C to +70°C
MAX1649EPA
-40°C to +85°C
MAX1649ESA
-40°C to +85°C
MAX1651CPA
0°C to +70°C
MAX1651CSA
0°C to +70°C
MAX1651C/D
0°C to +70°C
MAX1651EPA
-40°C to +85°C
MAX1651ESA
-40°C to +85°C
* Dice are tested at TA = +25°C.
PIN-PACKAGE
8 Plastic DIP
8 SO
Dice*
8 Plastic DIP
8 SO
8 Plastic DIP
8 SO
Dice*
8 Plastic DIP
8 SO
__________________Pin Configuration
TOP VIEW
ON/OFF
V+
MAX1651
SHDN
CS
EXT
REF OUT
FB GND
P
OUTPUT
3.3V
OUT 1
FB 2
SHDN 3
REF 4
MAX1649
MAX1651
8 GND
7 EXT
6 CS
5 V+
DIP/SO
________________________________________________________________ Maxim Integrated Products 1
Call toll free 1-800-998-8800 for free samples or literature.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1651 Datasheet

5V/3.3V or Adjustable / High-Efficiency / Low-Dropout / Step-Down DC-DC Controllers

No Preview Available !

MAX1651 pdf
5V/3.3V or Adjustable, High-Efficiency,
Low-Dropout, Step-Down DC-DC Controllers
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, V+ to GND.......................................-0.3V, +17V
REF, SHDN, FB, CS, EXT, OUT .......................-0.3V, (V+ + 0.3V)
Continuous Power Dissipation (TA = +70°C)
Plastic DIP (derate 9.09mW/°C above +70°C) .............727mW
SO (derate 5.88mW/°C above +70°C) ..........................471mW
Operating Temperature Ranges
MAX1649C_A, MAX1651C_A ..............................0°C to +70°C
MAX1649E_A, MAX1651E_A ............................-40°C to +85°C
Storage Temperature Range .............................-65°C to +160°C
Lead Temperature (soldering, 10sec) .............................+300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(V+ = 5V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
SYMBOL
CONDITIONS
V+ Input Voltage Range
Supply Current
FB Trip Point
FB Input Current
Output Voltage
Reference Voltage
REF Load Regulation
REF Line Regulation
V+
I+
IFB
VOUT
VREF
VOUT < V+
V+ = 16V, SHDN 0.4V (operating, switch off)
V+ = 16V, SHDN 1.6V (shutdown)
V+ = 10V, SHDN 1.6V (shutdown)
MAX1649C, MAX1651C
MAX1649E, MAX1651E
MAX1649C, MAX1651C
MAX1649E, MAX1651E
Circuit of
Figure 1
MAX1649, V+ = 5.5V to 16V
MAX1651, V+ = 3.6V to 16V
MAX1649C, MAX1651C, IREF = 0µA
MAX1649E, MAX1651E, IREF = 0µA
0µA IREF 100µA, sourcing only
3V V+ 16V
Output Voltage
Line Regulation
Circuit of
Figure 1
MAX1649, 5.5V V+ 16V,
ILOAD = 1A
MAX1651, 3.6V V+ 16V,
ILOAD = 1A
MIN
3.0
1.470
1.4625
4.80
3.17
1.470
1.4625
TYP
78
2
1
1.5
1.5
5.0
3.3
1.5
1.5
4
40
MAX
16
100
5
1.530
1.5375
±50
±70
5.20
3.43
1.530
1.5375
10
100
UNITS
V
µA
V
nA
V
V
mV
µV/V
2.6
mV/V
1.7
Output Voltage
Load Regulation
Circuit of
Figure 1
MAX1649, 0A ILOAD 1.5A,
VIN = 10V
MAX1651, 0A ILOAD 1.5A,
VIN = 5V
-47
-45
mV/A
Efficiency
SHDN Input Current
SHDN Input Voltage High
SHDN Input Voltage Low
VIH
VIL
Circuit of
Figure 1
MAX1649, V+ = 10V,
ILOAD = 1A
MAX1651, V+ = 5V,
ILOAD = 1A
V+ = 16V, SHDN = 0V or V+
3V V+ 16V
3V V+ 16V
90
%
90
1 µA
1.6 V
0.4 V
2 _______________________________________________________________________________________


Part Number MAX1651
Description 5V/3.3V or Adjustable / High-Efficiency / Low-Dropout / Step-Down DC-DC Controllers
Maker Maxim
Total Page 12 Pages
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