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Part: MAX774C/D
Category:
Power Management
-> Battery Management
Description: MAX774, MAX775, MAX776 -5V/-12V/-15V or Adjustable, High-Efficiency, Low iq Inverting Dc-to-dc Controllers
Company: Maxim Integrated Products
Datasheet: Download MAX774C/D datasheet File size : 529 kB
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Datasheet text preview:
19-0191; Rev 2; 12/02
TION KIT EVALUA AILABLE AV
-5V/-12V/-15V or Adjustable, High-Efficiency, Low IQ Inverting DC-to-DC Controllers
General Description Features
o 85% Efficiency for 5mA to 1A Load Currents o Up to 5W Output Power o 100µA (max) Supply Current o 5µA (max) Shutdown Current o 3V to 16.5V Input Range o -5V (MAX774), -12V (MAX775), -15V (MAX776), or Adjustable Output Voltage o Current-Limited PFM Control Scheme o 300kHz Switching Frequency
MAX774/MAX775/MAX776
T h e MAX774/MAX775/MAX776 inverting switching regulators deliver high efficiency over three decades of l o a d current. A unique current-limited, pulsefrequency modulated (PFM) control scheme provides the benefits of pulse-width modulation (high efficiency with heavy loads), while using less than 100µA of supply current (vs. 2mA to 10mA for PWM converters). The result is high efficiency over a wide range of loads. These ICs also use tiny external components; their high switching frequency (up to 300kHz) allows for less than 5mm diameter surface-mount magnetics. The MAX774/MAX775/MAX776 accept input voltages from 3 V to 16.5V, and have preset output voltages of -5V, -12V, and -15V, respectively. Or, the output voltage c a n be user-adjusted with two resistors. Maximum VIN - VOUT differential voltage is limited only by the breakdown voltage of the chosen external switch transistor. These inverters use external P-channel MOSFET switches, allowing them to power loads up to 5W. If less power is required, use the MAX764/MAX765/MAX766 inverting switching regulators with on-board MOSFETs.
Ordering Information
PART MAX774CPA MAX774CSA MAX774C/D MAX774EPA MAX774ESA MAX774MJA 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
LCD-Bias Generators High-Efficiency DC-to-DC Converters Battery-Powered Applications Data Communicators
*Contact factory for dice specifications. Ordering Information continued on last page.
Typical Operating Circuit
INPUT 3V TO 16V V+
Pin Configuration
TOP VIEW
MAX774
ON/OFF SHDN
CS EXT P OUTPUT -5V
OUT FB SHDN REF
1 2 3 4
8
GND EXT CS V+
FB REF GND OUT
MAX774 MAX775 MAX776
7 6 5
DIP/SO
________________________________________________________________ Maxim Integrated Products
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For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com.
-5V/-12V/-15V or Adjustable, High-Efficiency, Low IQ Inverting DC-to-DC Controllers MAX774/MAX775/MAX776
ABSOLUTE MAXIMUM RATINGS
Supply Voltages V+ to OUT .........21V V+ to GND .....-0.3V, +17V OUT to GND ........-0.3V, to -17V REF, SHDN, FB, CS..-0.3V to (V+ + 0.3V) EXT .....(VOUT - 0.3V) to (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: MAX77_C_ _ .........0°C to +70°C MAX77_E_ _ ......-40°C to +85°C MAX77_MJA .........-55°C to +125°C Maximum Junction Temperatures: MAX77_C_ _/E_ _ ..+150°C MAX77_MJA.........+175°C Storage Temperature Range .....-65°C to +160°C Lead Temperature (soldering, 10s) .........+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, CREF = 0.1µF, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER V+ Input Voltage Range SYMBOL V+ V+ = 16.5V, SHDN 0.4V (operating) Supply Current V+ = 10V, SHDN 1.6V (shutdown) V+ = 16.5V, SHDN 1.6V (shutdown) FB Trip Point 3V V+ 16.5V MAX77_C FB Input Current IFB MAX77_E MAX77_M MAX774 Output Voltage VOUT MAX775 MAX776 MAX77_C Reference Voltage VREF IREF = 0µA MAX77_E MAX77_M REF Load Regulation REF Line Regulation Output Voltage Line Regulation (Circuit of Figure 2-- Bootstrapped) Output Voltage Load Regulation (Circuit of Figure 2-- Bootstrapped) 0µA IREF 100µA 3V V+ 16.5V MAX774, 4V V+ 15V, ILOAD = 0.5A MAX775, 4V V+ 8V, ILOAD = 0.2A MAX776, 4V V+ 6V, ILOAD = 0.1A MAX774, 0A ILOAD 1A, V+ = 5V MAX775, 0mA ILOAD 500mA, V+ = 5V MAX776, 0mA ILOAD 400mA, V+ = 5V MAX77_C/E MAX77_M -4.80 -11.52 -14.40 1.4700 1.4625 1.4550 -5 -12 -15 1.5 1.5 1.5 4 4 40 0.035 0.088 0.137 1.5 1.5 1.0 mV/A mV/V -10 2 4 10 ±50 ±70 ±90 -5.20 -12.48 -15.60 1.5300 1.5375 1.5450 10 15 100 mV µV/V V V nA mV CONDITIONS MIN 3.0 TYP MAX 16.5 100 5 µA UNITS V
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-5V/-12V/-15V or Adjustable, High-Efficiency, Low IQ Inverting DC-to-DC Controllers
ELECTRICAL CHARACTERISTICS (continued)
(V+ = 5V, ILOAD = 0mA, CREF = 0.1µF, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER Efficiency (Circuit of Figure 2-- Bootstrapped) SHDN Input Current SHDN Input Voltage High SHDN Input Voltage Low Current-Limit Trip Level (V+ CS) CS Input Current Switch Maximum On-Time Switch Minimum Off-Time EXT Rise Time EXT Fall Time tON (max) tOFF (max) V+ = 12V V+ = 12V CEXT = 1nF, V+ = 12V CEXT = 1nF, V+ = 12V 12 1.8 16 2.3 50 50 VIH VIL VCS SYMBOL CONDITIONS MAX774, V+ = 5V, ILOAD = 1A MAX775, V+ = 5V, ILOAD = 500mA MAX776, V+ = 5V, ILOAD = 400mA V+ = 16.5V, SHDN = 0V or V+ 3V V+ 16.5V 3V V+ 16.5V 3V V+ 16.5V MAX77_C/E MAX77_M MAX77_C/E MAX77_M 1.6 0.4 0.3 240 260 ±1 20 2.8 MIN TYP 82 88 87 ±1 MAX UNITS % µA V V mV µA µs µs ns ns
MAX774/MAX775/MAX776
180 160
210 210
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