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Part: MAX650AM
Category:
Power Management
-> DC-DC Converters
Description: 5V/3.3V/3V or Adjustable, High-Efficiency, Low-IQ, Step-down DC-DC Controllers
Company: Maxim Integrated Products
Datasheet: Download MAX650AM datasheet File size : 368 kB
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Datasheet text preview:
19-0225; Rev 3; 9/97
KIT ATION EVALU LABLE AVAI
5V/3.3V/3V or Adjustable, High-Efficiency, Low IQ, Step-Down DC-DC Controllers
_______________General Description
The MAX649/MAX651/MAX652 BiCMOS, step-down DCDC 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. T h e s e 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. O u t p u t 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 c o n v e r t e r s with on-chip FETs, which allow up to a 225mA load current.
____________________________Features
o o o o o o o More than 90% Efficiency (10mA to 1.5A Loads) More than 12.5W Output Power 100µA Max Quiescent Supply Current 5µA Max Shutdown Supply Current Less than 1.0V Dropout Voltage 16.5V Max Input Voltage 5V (MAX649), 3.3V (MAX651), 3V (MAX652), or Adjustable Output Voltage o Current-Limited Control Scheme o Up to 300kHz Switching Frequency
MAX649/MAX651/MAX652
______________Ordering Information
PART MAX649CPA MAX649CSA MAX649C/D MAX649EPA MAX649ESA MAX649MJA 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
5V-to-3.3V Green PC Applications High-Efficiency Step-Down Regulation Minimum-Component DC-DC Converters Battery-Powered Applications
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
INPUT 4V TO 16.5V
__________________Pin Configuration
TOP VIEW
V+ OUT 1 2 8 7 GND EXT CS V+
MAX651
ON/OFF SHDN CS EXT P OUTPUT 3.3V
FB
SHDN 3 REF 4
MAX649 MAX651 MAX652
6 5
REF FB GND
OUT
DIP/SO
________________________________________________________________ Maxim Integrated Products
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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.
5V/3.3V/3V or Adjustable, High-Efficiency, Low IQ, Step-Down DC-DC Controllers MAX649/MAX651/MAX652
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 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
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 V+ Input Voltage Range Supply Current SYMBOL V+ V+ = 16.5V, SHDN 0.4V (operating, switch off) IQ V+ = 16.5V, SHDN 1.6V (shutdown) V+ = 10V, SHDN 1.6V (shutdown) MAX649C, MAX65_C FB Trip Point MAX649E, MAX65_E MAX649M, MAX65_M MAX649C, MAX65_C FB Input Current IFB MAX649E, MAX65_E MAX649M, MAX65_M MAX649, V+ = 6V to 16.5V Output Voltage VOUT Circuit of Figure 1 MAX651, V+ = 4V to 16.5V MAX652, V+ = 4V to 16.5V MAX649C, MAX65_C, IREF = 0 Reference Voltage VREF MAX649E, MAX65_E, IREF = 0 MAX649M, MAX65_M, IREF = 0 REF Load Regulation REF Line Regulation 0 IREF 100µA, sourcing only 4V V+ 16.5V MAX649, 6V V+ 16V, ILOAD = 1A Output Voltage Line Regulation Circuit of Figure 1 MAX651, 4.5V V+ 16V, ILOAD = 1A MAX652, 4V V+ 16V, ILOAD = 1A MAX649C/E, MAX65_C/E MAX649M, MAX65_M 4.80 3.17 2.88 1.470 1.4625 1.455 5.0 3.3 3.0 1.5 1.5 1.5 4 4 40 2.6 1.7 1.9 mV/V 1.470 1.4625 1.455 CONDITIONS MIN 4.0 80 4 2 1.5 1.5 1.5 5 1.530 1.5375 1.545 ±50 ±70 ±90 5.20 3.43 3.12 1.530 1.5375 1.545 10 15 100 mV µV/V V V nA V TYP MAX 16.5 100 µA UNITS V
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5V/3.3V/3V or Adjustable, High-Efficiency, Low IQ, Step-Down DC-DC Controllers
ELECTRICAL CHARACTERISTICS (continued)
(V+ = 5V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER SYMBOL CONDITIONS MAX649, 0 ILOAD 1.5A, VIN = 10V Output Voltage Load Regulation Circuit of Figure 1 MAX651, 0 ILOAD 1.5A, VIN = 5V MAX652, 0 ILOAD 1.5A, VIN = 5V MAX649, V+ = 10V, ILOAD = 1A Efficiency Circuit of Figure 1 MAX651, V+ = 5V, ILOAD = 1A MAX652, V+ = 5V, ILOAD = 1A SHDN Input Current SHDN Input Voltage High SHDN Input Voltage Low Current-Limit Trip Level (V+ to CS) CS Input Current Switch Maximum On-Time Switch Minimum Off-Time EXT Rise Time EXT Fall Time tON (max) tOFF (min) VIH VIL VCS V+ = 16.5V, SHDN = 0V or V+ 4V V+ 16.5V 4V V+ 16.5V 4V V+ 16.5V 4V V+ 16.5V V+ = 12V V+ = 12V CEXT = 0.001µF, V+ = 12V CEXT = 0.001µF, V+ = 12V 12 1.8 16 2.3 50 50 MAX649C/E, MAX65_C/E MAX649M, MAX65_M 180 160 210 210 1.6 0.4 240 260 ±1 20 2.8 MIN TYP -47 -45 MAX UNITS
MAX649/MAX651/MAX652
mV/A
-45 92 89
%
88 1 µA V V mV µA µs µs ns ns
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