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Part: MAX773C/D
Category:
Power Management
-> DC-DC Converters
-> Step-up
Description: 5v/12v/15v or Adjustable, High-efficiency, Low Iq, Step-up DC-DC Controllers
Company: Maxim Integrated Products
Datasheet: Download MAX773C/D datasheet File size : 529 kB
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Datasheet text preview:
19-0202; Rev 2; 11/96
ANUAL N KIT M LUATIO ATA SHEET EVA WS D FOLLO
5V/12V/15V or Adjustable, High-Efficiency, Low IQ, Step-Up DC-DC Controllers
____________________________Features
o 90% Efficiency for 10mA to 1A Load Currents o Up to 15W Output Power o 110µA Max Supply Current o 5µA Max Shutdown Current o 2V to 16.5V Input Range (MAX770/MAX771/MAX772) o Internal Shunt Regulator for High Input Voltages (MAX773) o Preset or Adjustable Output Voltages MAX770: 5V or Adjustable MAX771: 12V or Adjustable MAX772: 15V or Adjustable MAX773: 5V, 12V, 15V, or Adjustable o Current-Limited PFM Control Scheme o 300kHz Switching Frequency
_______________General Description
The MAX770MAX773 step-up switching controllers prov i d e 90% efficiency over a 10mA to 1A load. A unique current-limited pulse-frequency-modulation (PFM) c o n t r o l scheme gives these devices the benefits of pulse-width-modulation (PWM) converters (high efficiency at heavy loads), while using less than 110µA of supply current (vs. 2mA to 10mA for PWM converters). These ICs use tiny external components. Their high switching frequencies (up to 300kHz) allow surfacemount magnetics of 5mm height and 9mm diameter. The MAX770/MAX771/MAX772 accept input voltages from 2V to 16.5V. Output voltages are preset at 5V, (MAX770), 12V (MAX771), and 15V (MAX772); they can also be adjusted using two resistors. The MAX773 accepts inputs from 3V to 16.5V. For a wider input range, it features an internal shunt regulator that allows unlimited higher input voltages. The MAX773's output can be set to 5V, 12V, or 15V, or it can be adjusted with two resistors. The MAX770MAX773 drive external N-channel MOSFET switches, allowing them to power loads up to 15W. If less p o w e r is required, use the MAX756/MAX757 or MAX761/MAX762 step-up switching regulators with onboard MOSFETs.
MAX770MAX773
______________Ordering Information
PART MAX770CPA MAX770CSA MAX770C/D MAX770EPA MAX770ESA MAX770MJA 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 Plastic DIP 8 SO Dice* 8 Plastic DIP 8 SO 8 CERDIP**
________________________Applications
Palmtops/Handy-Terminals High-Efficiency DC-DC Converters Battery-Powered Applications Positive LCD-Bias Generators Portable Communicators Flash Memory Programmers
Ordering Information continued at end of data sheet. *Contact factory for dice specifications. **Contact factory for availability and processing to MIL-STD-883B.
_________________Pin Configurations __________Typical Operating Circuit
INPUT 2V TO VOUT OUTPUT 12V
EXT V+ 1 2 8 CS GND AGND REF 7 6 5
TOP VIEW
MAX771
ON/OFF SHDN
EXT CS
N
FB 3 SHDN 4
MAX770 MAX771 MAX772
DIP/SO
REF FB AGND GND V+
Pin Configurations continued at end of data sheet.
________________________________________________________________ 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/12V/15V or Adjustable, High-Efficiency, Low IQ, Step-Up DC-DC Controllers MAX770MAX773
ABSOLUTE MAXIMUM RATINGS
Supply Voltages V+ to GND....-0.3V to 17V V+ to SGND....-0.3V to 7V SGND ........-0.3V to (V+ + 0.3V) EXT, CS, REF, LBO, LBI, SHDN, FB....-0.3V to (V+ + 0.3V) EXTH, EXTL ........-0.3V to (V+ + 0.3V) V5, V12, V15 ....-0.3V to 17V GND to AGND .........0.1V to -0.1V ISGND ..........50mA Continuous Power Dissipation (TA = +70°C) 8-Pin Plastic DIP (derate 9.09mW/°C above +70°C)....727mW 8-Pin SO (derate 5.88mW/°C above +70°C) .......471mW 8-Pin CERDIP (derate 8.00mW/°C above +70°C) ........640mW 14-Pin Plastic DIP (derate 10.00mW/°C above +70°C) .....800mW 14-Pin SO (derate 8.33mW/°C above +70°C) .....667mW 14-Pin CERDIP (derate 9.09mW/°C above +70°C) ......727mW Operating Temperature Ranges MAX77_C_ _ ........0°C to +70°C MAX77_E_ _ ......-40°C to +85°C MAX77_MJ_ .........-55°C to +125°C Junction Temperatures MAX77_C_ _/E_ _ ..........+150°C MAX77_MJ_.........+175°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, ILOAD = 0mA, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER SYMBOL CONDITIONS MAX770772 (internal feedback resistors) MAX770772C/E (external resistors) Input Voltage Range MAX770772MJA (external resistors) MAX773C/E MAX773MJD Minimum Start-Up Voltage Supply Current Standby Current MAX770/MAX771/MAX772 V+ = 16.5V, SHDN = 0V (normal operation) V+ = 10.0V, SHDN 1.6V (shutdown) V+ = 16.5V, SHDN 1.6V (shutdown) V+ = 2.0V to 5.0V, over full load range Output Voltage (Note 1) V+ = 2.0V to 12.0V, over full load range V+ = 2.0V to 15.0V, over full load range Output Voltage Line Regulation (Note 2) Output Voltage Load Regulation (Note 2) Maximum Switch On-Time Minimum Switch Off-Time Efficiency Reference Voltage VREF tON(max) tOFF(min) V+ = 4V, ILOAD = 500mA, VOUT = 5V MAX77_C IREF = 0µA MAX77_E MAX77_M 1.4700 1.4625 1.4550 Figure 2a, V+ = 2.7V to 4.5V, ILOAD = 700mA, VOUT = 5V Figure 2a, V+ = 3V, ILOAD = 30mA to 1A, VOUT = 5V 12 1.8 4.80 11.52 14.40 MIN 2.0 3.0 3.1 3.0 3.1 1.8 85 2 4 5.0 12.0 15.0 5 5.20 12.48 15.60 mV/V V TYP MAX 16.5 16.5 16.5 16.5 16.5 2.0 110 5 V µA µA V UNITS
20 16 2.3 87 1.5 1.5 1.5 1.5300 1.5375 1.5450 20 2.8
mV/A µs µs % V
2
_______________________________________________________________________________________
5V/12V/15V or Adjustable, High-Efficiency, Low IQ, Step-Up DC-DC Controllers
ELECTRICAL CHARACTERISTICS (continued)
(V+ = 5V, ILOAD = 0mA, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETERS REF Load Regulation REF Line Regulation SYMBOL CONDITIONS 0µA IREF 100µA 3V V+ 16.5V MAX77_C FB Trip-Point Voltage VFB MAX77_E MAX77_M MAX77_C FB Input Current IFB MAX77_E MAX77_M SHDN Input High Voltage SHDN Input Low Voltage SHDN Input Current LBI Input Current LBI Hysteresis LBI Delay VIH VIL V+ = 2.0V to 16.5V MAX77_C/E, V+ = 2.0V to 16.5V MAX77_M, V+ = 2.0V to 16.5V V+ = 16.5V, SHDN = 0V or V+ MAX773, V+ = 16.5V, LBI = 1.5V MAX773 5mV overdrive MAX77_C LBI Threshold Voltage MAX773, LBI falling MAX77_E MAX77_M LBO Leakage Current LBO Output Voltage Low Current-Limit Trip Level CS Input Current EXT Rise Time EXT Fall Time Supply Voltage in Shunt Mode VSHUNT V+ = 5V, 1nF from EXT to ground (Note 3) V+ = 5V, 1nF from EXT to ground (Note 3) MAX773, ISHUNT = 1mA to 20mA, SGND = 0V, CSHUNT = 0.1µF 5.5 VOL VCS MAX773, V+ = 16.5V, VLBO = 16.5V MAX773, V+ = 5V, LBO sinking 1mA V+ = 5V to 16.5V 170 1.4700 1.4625 1.4550 20 2.5 1.50 1.50 1.50 0.01 0.1 200 0.01 55 55 6.3 1.5300 1.5375 1.5450 1.00 0.4 230 ±1 µA V mV µA ns ns V V 1.6 0.4 0.2 ±1 ±20 1.4700 1.4625 1.4550 MAX77_C/E MAX77_M MIN TYP 4 4 40 1.50 1.50 1.50 MAX 10 15 100 1.5300 1.5375 1.5450 ±20 ±40 ±60 V V µA nA mV µs nA V UNITS mV µV/V
MAX770MAX773
3
Note 1: Output voltage guaranteed using preset voltages. See Figures 7a7d for output current capability versus input voltage. Note 2: Output voltage line and load regulation depend on external circuit components. Note 3: For the MAX773, EXT is EXTH and EXTL shorted together.
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