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Part: MAX639-3
Category:
Power Management
-> Battery Management
Description: MAX639, MAX640, MAX653 5V/3.3V/3V Adjustable, High-Efficiency, Low-IQ, Step-down DC-DC Converters
Company: Maxim Integrated Products
Datasheet: Download MAX639-3 datasheet File size : 299 kB
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Datasheet text preview:
19-4505; Rev 3; 8/97
KIT ATION EVALU LUDED ION INC ORMAT INF
5V/3.3V/3V/Adjustable, High-Efficiency, Low IQ, Step-Down DC-DC Converters
____________________________Features
o High Efficiency for a Wide Range of Load Currents o 10µA Quiescent Current o Output Currents Up to 225mA o Preset or Adjustable Output Voltage: 5.0V (MAX639) 3.3V (MAX640) 3.0V (MAX653) o Low-Battery Detection Comparator o Current-Limiting PFM Control Scheme
_______________General Description
T h e 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 t h e 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. T h e MAX639/MAX640/MAX653 input range is 4V to 11.5V, and the devices provide lower preset output voltages 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-component, 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.
MAX639/MAX640/MAX653
______________Ordering Information
PART MAX639CPA MAX639CSA MAX639C/D MAX639EPA MAX639ESA MAX639MJA TEMP. RANGE 0°C to +70°C 0°C to +70°C 0°C to +70°C -40°C to +85°C -40°C to +85°C -55°C to +125°C PIN-PACKAGE 8 Plastic DIP 8 SO Dice* 8 Plastic DIP 8 SO 8 CERDIP
________________________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
Ordering Information continued on last page. * Contact factory for dice specifications.
__________Typical Operating Circuit
INPUT 5.5V TO 11.5V
V+
__________________Pin Configuration
TOP VIEW
LX
OUTPUT 5V 225mA
VOUT 1 2 3 4 8 SHDN VFB V+
MAX639
ON/OFF LOW-BATTERY DETECTOR INPUT SHDN LBI VOUT LBO LOW-BATTERY DETECTOR OUTPUT
LBO LBI GND
MAX639 MAX640 MAX653
7 6
5 LX
DIP/SO
VFB GND
________________________________________________________________ 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 408-737-7600 ext. 3468.
5V/3.3V/3V/Adjustable, High-Efficiency, Low IQ, Step-Down DC-DC Converters MAX639/MAX640/MAX653
ABSOLUTE MAXIMUM RATINGS
V+ ..........12V LX .........(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.
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+ = 9V for the MAX639, V+ = 5V for the MAX640/MAX653, ILOAD = 0mA, TA = TMIN to TMAX, typical values are at TA = +25°C, unless otherwise noted.) PARAMETER Supply Voltage Supply Current Output Voltage (Note 2) Dropout Voltage SHDN = V+, no load MAX639, V+ = 6.0V to 11.5V, 0mA < IOUT < 100mA MAX640, V+ = 4.0V to 11.5V, 0mA < IOUT < 100mA MAX653, V+ = 4.0V to 11.5V, 0mA < IOUT < 100mA IOUT = 100mA, L = 100µH MAX639 Efficiency MAX640 MAX653 MAX639 Switch On-Time MAX640 MAX653 MAX639 Switch Off-Time MAX640 MAX653 IOUT = 100mA, L = 100µH IOUT = 25mA, L = 470µH IOUT = 100mA, L = 100µH IOUT = 25mA, L = 470µH IOUT = 100mA, L = 100µH IOUT = 25mA, L = 470µH V+ = 9V, VOUT = 5V V+ = 6V, VOUT = 3V V+ = 9V, VOUT = 3.3V V+ = 4V, VOUT = 3.3V V+ = 9V, VOUT = 3V V+ = 4V, VOUT = 3V V+ = 9V, VOUT = 5V V+ = 6V, VOUT = 3V V+ = 9V, VOUT = 3.3V V+ = 4V, VOUT = 3.3V V+ = 9V, VOUT = 3V V+ = 4V, VOUT = 3V 10.6 14.2 7.5 60.7 7.1 42.5 9.0 16.6 13.3 13.3 14.6 14.6 4.80 3.17 2.88 CONDITIONS MIN 4.0 TYP 10 5.00 3.30 3.00 0.5 91 94 87 91 85 89 12.5 16.7 8.8 71.4 8.3 50.0 11.7 19.5 15.6 15.6 17.2 17.2 14.4 19.2 10.1 82.1 9.5 57.5 13.5 22.4 17.9 17.9 19.8 19.8 µs µs % MAX 11.5 20 5.20 3.43 3.12 V V UNITS V µA
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5V/3.3V/3V/Adjustable, High-Efficiency, Low IQ, Step-Down DC-DC Converters
ELECTRICAL CHARACTERISTICS (continued)
(V+ = 9V for the MAX639, V+ = 5V for the MAX640/MAX653, ILOAD = 0mA, TA = TMIN to TMAX, typical values are at TA = +25°C, unless otherwise noted.) PARAMETER LX Switch On-Resistance CONDITIONS V+ = 9V, TA = +25°C, MAX639/MAX640/MAX653 V+ = 6V, TA = TMIN to TMAX, MAX639 V+ = 4V, TA = TMIN to TMAX, MAX640/MAX653 LX Switch Leakage VFB Bias Current VFB Dual-Mode Trip Point VFB Threshold LBI Bias Current LBI Threshold LBO Sink Current LBO Leakage Current LBO Delay SHDN Threshold SHDN Pull-Up Current SHDN = 0V MAX6_ _C MAX6_ _E/M VLBI = 2V MAX6_ _C MAX6_ _E/M VLBO = 0.4V VLBO = 11.5V 50mV overdrive 0.80 0.10 MAX639 MAX640/MAX653 1.26 1.24 0.8 0.4 1.26 1.24 V+ = 11.5V, VLX = 0V VFB = 2V TA = +25°C TA = TMIN to TMAX 4.0 50 1.28 1.28 2 1.28 1.28 2.5 1.2 0.001 25 1.15 0.20 2.00 0.40 0.1 1.30 1.32 10 1.30 1.32 0.003 MIN TYP 0.8 MAX 1.5 2.5 2.8 1.0 30.0 15.0 µA nA mV V nA V mA µA µs V µA UNITS
MAX639/MAX640/MAX653
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).
__________________________________________Typical Operating Characteristics
(Circuit of Figure 3, internal feedback, L = 100µH, TA = +25°C, unless otherwise noted.)
EFFICIENCY vs. OUTPUT CURRENT
MAX639-1
EFFICIENCY vs. OUTPUT CURRENT
L = 470µH
MAX639-2
EFFICIENCY vs. OUTPUT CURRENT
L = 470µH V+ = 9V
MAX639-3
100
L = 100µH V+ = 9V
100
100
90 EFFICIENCY (%) EFFICIENCY (%)
90 EFFICIENCY (%)
90
80 MAX639 MAX640 MAX653
80
MAX639, V+ = 6V MAX640, V+ = 4.3V MAX653, V+ = 4V
80 MAX639 MAX640 MAX653
70
70
70
60
60
60
50
10µ
100µ
50 1m 10m 100m 1 OUTPUT CURRENT (A)
10µ
100µ
50 1m 10m 100m
10µ
100µ
1m
10m
100m
OUTPUT CURRENT (A)
OUTPUT CURRENT (A)
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