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MAX652CPAMAXIM ?N/a23avai5V/3.3V/3V or Adjustable, High-Efficiency,
MAX652CSAMAXN/a401avai5V/3.3V/3V or Adjustable, High-Efficiency,
MAX652CSAMAXIMN/a172avai5V/3.3V/3V or Adjustable, High-Efficiency,
MAX652ESAMAXIMN/a3avai5V/3.3V/3V or Adjustable, High-Efficiency,
MAX649CPAN/a16avai5V/3.3V/3V or Adjustable, High-Efficiency,
MAX649CSAMAXIMN/a156avai5V/3.3V/3V or Adjustable, High-Efficiency,
MAX649ESAMAXIMN/a120avai5V/3.3V/3V or Adjustable, High-Efficiency,


MAX652CSA ,5V/3.3V/3V or Adjustable, High-Efficiency,Applications__________Typical Operating Circuit__________________Pin ConfigurationINPUTTOP VIEW4V T ..
MAX652CSA ,5V/3.3V/3V or Adjustable, High-Efficiency,General Description ________
MAX652ESA ,5V/3.3V/3V or Adjustable, High-Efficiency,FeaturesThe MAX649/MAX651/MAX652 BiCMOS, step-down DC- ' More than 90% Efficiency (10mA to 1.5A Loa ..
MAX653CSA+ ,5V/3.3V/3V Adjustable, High-Efficiency, Low-IQ, Step-Down DC-DC Convertersapplications. For increasedoutput drive capability, use the MAX649/MAX651/MAX652MAX639CPA 0°C to +7 ..
MAX653CSA+T ,5V/3.3V/3V Adjustable, High-Efficiency, Low-IQ, Step-Down DC-DC ConvertersELECTRICAL CHARACTERISTICS(V+ = 9V for the MAX639, V+ = 5V for the MAX640/MAX653, I = 0mA, T = T to ..
MAX653ESA ,5V/3.3V/3V/Adjustable, High-Efficiency, Low IQ, Step-Down DC-DC Converters
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MB3614 ,QUAD OPERATIONAL AMPLIFIERFUJITSU SEMICONDUCTORDS04-11107-3EDATA SHEETLINEAR ICQUAD OPERATIONAL AMPLIFIERMB3614QUAD OPERATION ..
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MAX649CPA-MAX649CSA-MAX649ESA-MAX652CPA-MAX652CSA-MAX652ESA
5V/3.3V/3V or Adjustable, High-Efficiency,
_______________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
More than 90% Efficiency (10mA to 1.5A Loads)More than 12.5W Output Power100µA Max Quiescent Supply Current5µA Max Shutdown Supply CurrentLess than 1.0V Dropout Voltage16.5V Max Input Voltage5V (MAX649), 3.3V (MAX651), 3V (MAX652),
or Adjustable Output Voltage
Current-Limited Control SchemeUp to 300kHz Switching Frequency
______________Ordering Information
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.
MAX649/MAX651/MAX652
5V/3.3V/3V or Adjustable, High-Efficiency,
Low IQ, Step-Down DC-DC Controllers
________________________________________________________________Maxim Integrated Products1
__________________Pin Configuration__________Typical Operating Circuit
& the latest literature: http://, .
For small orders, phone 1-800-835-8769.
MAX649/MAX651/MAX652
5V/3.3V/3V or Adjustable, High-Efficiency,
Low IQ, Step-Down DC-DC Controllers_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS

(V+ = 5V, TA= TMINto TMAX, unless otherwise noted. Typical values are at TA= +25°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.
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
CERDIP (derate 8.00mW/°C above +70°C)..................640mW
Operating Temperature Ranges
MAX649C_A, MAX65_C_A..................................0°C to +70°C
MAX649E_A, MAX65_E_A................................-40°C to +85°C
MAX649MJA, MAX65_MJA............................-55°C to +125°C
Storage Temperature Range.............................-65°C to +160°C
Lead Temperature (soldering, 10sec).............................+300°C
MAX649/MAX651/MAX652
5V/3.3V/3V or Adjustable, High-Efficiency,
Low IQ, Step-Down DC-DC Controllers
_______________________________________________________________________________________3
ELECTRICAL CHARACTERISTICS (continued)

(V+ = 5V, TA= TMINto TMAX, unless otherwise noted. Typical values are at TA= +25°C.)
MAX649/MAX651/MAX652
5V/3.3V/3V or Adjustable, High-Efficiency,
Low IQ, Step-Down DC-DC Controllers_______________________________________________________________________________________
__________________________________________Typical Operating Characteristics

(TA = +25°C, unless otherwise noted.)
MAX649/MAX651/MAX652
5V/3.3V/3V or Adjustable, High-Efficiency,
Low IQ, Step-Down DC-DC Controllers
_______________________________________________________________________________________5
____________________________Typical Operating Characteristics (continued)

(TA = +25°C, unless otherwise noted.)
MAX649/MAX651/MAX652
5V/3.3V/3V or Adjustable, High-Efficiency,
Low IQ, Step-Down DC-DC Controllers
_____________________________Typical Operating Characteristics (continued)
______________________________________________________________Pin Description
MAX649/MAX651/MAX652
5V/3.3V/3V or Adjustable, High-Efficiency,
Low IQ, Step-Down DC-DC Controllers
_______________________________________________________________________________________7
_______________Detailed Description

The MAX649/MAX651/MAX652 are BiCMOS, step-
down, switch-mode power-supply controllers that pro-
vide fixed outputs of 5V, 3.3V, and 3V, respectively.
Their unique control scheme combines the advantages
of pulse-frequency-modulation (low supply current)
and pulse-width-modulation (high efficiency at high
loads). An external P-channel power MOSFET allows
peak currents in excess of 3A, increasing the output
current capability over previous PFM devices. Figure 2
is the block diagram.
The MAX649/MAX651/MAX652 offer three main
improvements over prior solutions: The converters operate with tiny (less than 9mm
diameter) surface-mount inductors, due to their
300kHz switching frequency.The current-limited PFM control scheme allows
greater than 90% efficiencies over a wide range of
load currents (1.0mA to 1.5A).The maximum supply current is only 100µA.
PFM Control Scheme

The MAX649/MAX651/MAX652 use a proprietary, cur-
rent-limited PFM control scheme. As with traditional
PFM converters, the external power MOSFET is turned
on when the voltage comparator senses that the output
is out of regulation. However, unlike traditional PFM
converters, switching is accomplished through the
combination of a peak current limit and a pair of one-
shots that set the maximum switch on-time (16µs) and
minimum switch off-time (2.3µs). Once off, the minimum
off-time one-shot holds the switch off for 2.3µs. After
this minimum time, the switch either 1) stays off if the
output is in regulation, or 2) turns on again if the output
is out of regulation.
The MAX649/MAX651/MAX652 also limit the peak induc-
tor current, which allows them to run in continuous-con-
duction mode and maintain high efficiency with heavy loads
(Figure 3a). This current-limiting feature is a key compo-
nent of the control circuitry. Once turned on, the switch
stays on until either 1) the maximum on-time one-shot turns
it off (16µs later), or 2) the current limit is reached.
To increase light-load efficiency, the current limit for
the first two pulses is set to half the peak current limit.
If those pulses bring the output voltage into regulation,
the voltage comparator holds the MOSFET off and the
current limit remains at half its peak. If the output vol-
tage is still out of regulation after two pulses, the
current limit for the next pulse is raised to its peak (Figure
3b). Calculate the peak current limit by dividing the
Current-Limit Trip Level (see Electrical Characteristics)
by the value of the current-sense resistor.
Shutdown Mode

When SHDN is high, the MAX649/MAX651/MAX652 enter
shutdown mode. In this mode, the internal biasing circuit-
ry is turned off (including the reference) and the supply
current drops to less than 5µA. EXT goes high, turning off
the external MOSFET. SHDN is a TTL/CMOS logic-level
input. Connect SHDN to GND for normal operation.
Quiescent Current

In normal operation, the quiescent current is less than
100µA. However, this current is measured by forcing
the external transistor switch off. In an actual applica-
tion, even with no load, additional current is drawn to
supply external feedback resistors (if used) and the
diode and capacitor leakage currents. In the circuit of
Figure 1, with V+ at 5V and VOUTat 3.3V, the typical
quiescent current is 90µA.
EXT Drive Voltage Range

EXT swings from V+ to GND and provides the drive out-
put for an external P-channel power MOSFET.
Modes of Operation

When delivering high output currents, the MAX649/
MAX651/MAX652 operate in continuous-conduction
mode (CCM). In this mode, current always flows in the
MAX649/MAX651/MAX652
5V/3.3V/3V or Adjustable, High-Efficiency,
Low IQ, Step-Down DC-DC Controllers_______________________________________________________________________________________

Figure 2. Block Diagram
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