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MAX639CPA+ |MAX639CPAMAXIMN/a5400avai5V/3.3V/3V Adjustable, High-Efficiency, Low-IQ, Step-Down DC-DC Converters
MAX639CSA+MAIXMN/a2500avai5V/3.3V/3V Adjustable, High-Efficiency, Low-IQ, Step-Down DC-DC Converters
MAX639ESA-T |MAX639ESATMAIXMN/a2500avai5V/3.3V/3V Adjustable, High-Efficiency, Low-IQ, Step-Down DC-DC Converters
MAX639CSA+ |MAX639CSAMAXIMN/a53avai5V/3.3V/3V Adjustable, High-Efficiency, Low-IQ, Step-Down DC-DC Converters
MAX639ESA+ |MAX639ESAMAXIMN/a60avai5V/3.3V/3V Adjustable, High-Efficiency, Low-IQ, Step-Down DC-DC Converters
MAX639ESA+T |MAX639ESATMAXIMN/a913avai5V/3.3V/3V Adjustable, High-Efficiency, Low-IQ, Step-Down DC-DC Converters
MAX639ESA+T |MAX639ESATMAXN/a1avai5V/3.3V/3V Adjustable, High-Efficiency, Low-IQ, Step-Down DC-DC Converters
MAX640CSA+N/AN/a2500avai5V/3.3V/3V Adjustable, High-Efficiency, Low-IQ, Step-Down DC-DC Converters
MAX640CSA+ |MAX640CSAMAXIMN/a1080avai5V/3.3V/3V Adjustable, High-Efficiency, Low-IQ, Step-Down DC-DC Converters
MAX640ESA+ |MAX640ESAMAXIMN/a1950avai5V/3.3V/3V Adjustable, High-Efficiency, Low-IQ, Step-Down DC-DC Converters
MAX640ESA+T |MAX640ESATMAXN/a1415avai5V/3.3V/3V Adjustable, High-Efficiency, Low-IQ, Step-Down DC-DC Converters
MAX640ESA-T |MAX640ESATMAXIMN/a1avai5V/3.3V/3V Adjustable, High-Efficiency, Low-IQ, Step-Down DC-DC Converters
MAX653CSA+TMAIXMN/a2500avai5V/3.3V/3V Adjustable, High-Efficiency, Low-IQ, Step-Down DC-DC Converters
MAX653CSA+ |MAX653CSAMAXIMN/a58avai5V/3.3V/3V Adjustable, High-Efficiency, Low-IQ, Step-Down DC-DC Converters
MAX653ESA+ |MAX653ESAMAXIMN/a2500avai5V/3.3V/3V Adjustable, High-Efficiency, Low-IQ, Step-Down DC-DC Converters


MAX639CPA+ ,5V/3.3V/3V Adjustable, High-Efficiency, Low-IQ, Step-Down DC-DC ConvertersApplicationsMAX639ESA -40°C to +85°C 8 SO9V Battery to 5V, 3.3V, or 3V ConversionMAX639MJA -55°C to ..
MAX639CSA ,5V or adjustable, high-efficiency, current-limiting PFM control scheme, step-down DC-DC converter.
MAX639CSA ,5V or adjustable, high-efficiency, current-limiting PFM control scheme, step-down DC-DC converter.
MAX639CSA+ ,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 ..
MAX639CSA+ ,5V/3.3V/3V Adjustable, High-Efficiency, Low-IQ, Step-Down DC-DC ConvertersGeneral Description ________
MAX639ESA ,5V/3.3V/3V/Adjustable, High-Efficiency, Low IQ, Step-Down DC-DC Converters
MB2S ,Bridge RectifiersMB1S - MB8SMB1S - MB8S43
MB3120 ,Compandor ICBLOCK DIAGRAM COMPRESSOR EXPANDOH INPUT COMMON MUTE COMPRESSOR', SECTION COMPRESS ..
MB3516A ,RGB EncoderFUJITSU SEMICONDUCTORDS04-28026-2EDATA SHEETASSP Image ControlRGB EncoderMB3516An DESCRIPTIONThe ..
MB3516APF ,RGB EncoderFUJITSU SEMICONDUCTORDS04-28026-2EDATA SHEETASSP Image ControlRGB EncoderMB3516An DESCRIPTIONThe ..
MB3614 ,QUAD OPERATIONAL AMPLIFIERFUJITSU SEMICONDUCTORDS04-11107-3EDATA SHEETLINEAR ICQUAD OPERATIONAL AMPLIFIERMB3614QUAD OPERATION ..
MB3614P ,Quad operational amplifierelectrical characteristics of current industrial standard operational am-DIP-14P-M02plifier and req ..


MAX639CPA+-MAX639CSA+-MAX639ESA+-MAX639ESA+T-MAX639ESA-T-MAX640CSA+-MAX640ESA+-MAX640ESA+T-MAX640ESA-T-MAX653CSA+-MAX653CSA+T-MAX653ESA+
5V/3.3V/3V Adjustable, High-Efficiency, Low-IQ, Step-Down DC-DC Converters
_______________General Description
The MAX639/MAX640/MAX653 step-down switching
regulators provide high efficiency over a wide range of
load currents, delivering up to 225mA. A current-limiting
pulse-frequency-modulated (PFM) control scheme gives
the devices the benefits of pulse-width-modulated
(PWM) converters (high efficiency at heavy loads), while
using only 10µA of supply current (vs. 2mA to 10mA for
PWM converters). The result is high efficiency over a
wide range of loads.
The MAX639/MAX640/MAX653 input range is 4V to
11.5V, and the devices provide lower preset output volt-
ages of 5V, 3.3V, and 3V, respectively. Or, the output
can be user-adjusted to any voltage from 1.3V to the
input voltage.
The MAX639/MAX640/MAX653 have an internal 1A power
MOSFET switch, making them ideal for minimum-compo-
nent, low- and medium-power applications. For increased
output drive capability, use the MAX649/MAX651/MAX652
step-down controllers, which drive an external P-channel
FET to deliver up to 5W.
________________________Applications

9V Battery to 5V, 3.3V, or 3V Conversion
High-Efficiency Linear Regulator Replacement
Portable Instruments and Handy-Terminals
5V-to-3.3V Converters
____________________________Features
High Efficiency for a Wide Range of Load Currents10µA Quiescent CurrentOutput Currents Up to 225mAPreset or Adjustable Output Voltage:
5.0V (MAX639)
3.3V (MAX640)
3.0V (MAX653)
Low-Battery Detection ComparatorCurrent-Limiting PFM Control Scheme
______________Ordering Information
Ordering Information continued on last page.

* Contact factory for dice specifications.
MAX639/MAX640/MAX653
5V/3.3V/3V/Adjustable, High-Efficiency,
Low IQ, Step-Down DC-DC Converters

19-4505; Rev 3; 8/97
__________________Pin Configuration
__________Typical Operating Circuit
MAX639/MAX640/MAX653
5V/3.3V/3V/Adjustable, High-Efficiency,
Low IQ, Step-Down DC-DC Converters
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS

(V+ = 9V for the MAX639, V+ = 5V for the MAX640/MAX653, ILOAD= 0mA, TA= TMINto TMAX, typical values are at TA= +25°C,
unless otherwise noted.)
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.
V+...........................................................................................12V.........................................................(V+ - 12V) to (V+ + 0.3V)
LBI, LBO, VFB, SHDN, VOUT........................-0.3V to (V+ + 0.3V)
LX Output Current (Note 1)......................................................1A
LBO Output Current............................................................10mA
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:
MAX639C_ _.......................................................0°C to +70°C
MAX639E_ _....................................................-40°C to +85°C
MAX639MJA..................................................-55°C to +125°C
Storage Temperature Range.............................-65°C to +160°C
Lead Temperature (soldering, 10sec).............................+300°C
Note 1:
Peak inductor current must be limited to 600mA by using an inductor of 100µH or greater.
MAX639/MAX640/MAX653
5V/3.3V/3V/Adjustable, High-Efficiency,
Low IQ, Step-Down DC-DC Converters
__________________________________________Typical Operating Characteristics

(Circuit of Figure 3, internal feedback, L = 100µH, TA= +25°C, unless otherwise noted.)
Note 2:
Output guaranteed by correlation to measurements of device parameters (i.e., switch on-resistance, on-times, off-times, and
output voltage trip points).
ELECTRICAL CHARACTERISTICS (continued)

(V+ = 9V for the MAX639, V+ = 5V for the MAX640/MAX653, ILOAD= 0mA, TA= TMINto TMAX, typical values are at TA= +25°C,
unless otherwise noted.)
MAX639/MAX640/MAX653
5V/3.3V/3V/Adjustable, High-Efficiency,
Low IQ, Step-Down DC-DC Converters
_____________________________Typical Operating Characteristics (continued)

(Circuit of Figure 3, internal feedback, L = 100µH, TA= +25°C, unless otherwise noted.)
MAX639/MAX640/MAX653
5V/3.3V/3V/Adjustable, High-Efficiency,
Low IQ, Step-Down DC-DC Converters
_____________________________Typical Operating Characteristics (continued)

(Circuit of Figure 3, internal feedback, L = 100µH, TA= +25°C, unless otherwise noted.)
MAX639/MAX640/MAX653
5V/3.3V/3V/Adjustable, High-Efficiency,
Low IQ, Step-Down DC-DC Converters
_____________________________Typical Operating Characteristics (continued)

(Circuit of Figure 3, internal feedback, L = 100µH, TA= +25°C, unless otherwise noted.)
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