19-0191; Rev 1; 3/94 _______________________________ _______________________________ ◆ ◆ ◆ µ ◆ µ µ ◆ ◆ ◆ ◆ _______________________________ TEMP. RANGE PIN-PACKAGE MAX774CPA PART 0°C to +70°C 8 Plastic DIP MAX774CSA MAX774C/D MAX774EPA MAX774ESA MAX774MJA 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 8 SO Dice* 8 Plastic DIP 8 SO 8 CERDIP Ordering Information continued on last page. _______________________ * Contact factory for dice specifications. ________________________ INPUT 3V TO 16V ____________________________ TOP VIEW V+ MAX774 ON/OFF OUT CS 1 8 GND SHDN EXT P OUTPUT -5V FB 2 SHDN 3 REF 4 FB REF MAX774 MAX775 MAX776 7 EXT 6 CS 5 V+ DIP/SO GND OUT ________________________________________________________________ Maxim Integrated Products 1 MAX774/MAX775/MAX776 TION KIT EVALUA LE AVAILAB 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, 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, CREF = 0.1µF, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER V+ Input Voltage Range SYMBOL CONDITIONS MIN V+ TYP 3.0 V+ = 16.5V, SHDN ≤ 0.4V (operating) Supply Current FB Input Current Output Voltage Reference Voltage 2 V+ = 16.5V, SHDN ≥ 1.6V (shutdown) 4 VOUT VREF -10 5 µA 10 mV ±50 MAX77_E ±70 MAX77_M ±90 MAX774 -4.80 -5 -5.20 MAX775 -11.52 -12 -12.48 MAX776 -14.40 -15 -15.60 IREF = 0µA 0µA ≤ IREF ≤ 100µA REF Line Regulation 3V ≤ V+ ≤ 16.5V Output Voltage Load Regulation (Circuit of Figure 2— Bootstrapped) V MAX77_C REF Load Regulation Output Voltage Line Regulation (Circuit of Figure 2— Bootstrapped) 2 IFB UNITS 16.5 100 V+ = 10V, SHDN ≥ 1.6V (shutdown) 3V ≤ V+ ≤ 16.5V FB Trip Point MAX MAX77_C 1.4700 1.5 1.5300 MAX77_E 1.4625 1.5 1.5375 MAX77_M 1.4550 1.5 1.5450 MAX77_C/E 4 10 MAX77_M 4 15 40 100 MAX774, 4V ≤ V+ ≤ 15V, ILOAD = 0.5A 0.035 MAX775, 4V ≤ V+ ≤ 8V, ILOAD = 0.2A 0.088 MAX776, 4V ≤ V+ ≤ 6V, ILOAD = 0.1A 0.137 MAX774, 0A ≤ ILOAD ≤ 1A, V+ = 5V 1.5 MAX775, 0mA ≤ ILOAD ≤ 500mA, V+ = 5V 1.5 MAX776, 0mA ≤ ILOAD ≤ 400mA, V+ = 5V 1.0 _______________________________________________________________________________________ nA V V mV µV/V mV/V mV/A PARAMETER SYMBOL Efficiency (Circuit of Figure 2— Bootstrapped) CONDITIONS MAX774, V+ = 5V, ILOAD = 1A MIN MAX775, V+ = 5V, ILOAD = 500mA MAX776, V+ = 5V, ILOAD = 400mA SHDN Input Current SHDN Input Voltage High SHDN Input Voltage Low VIH VIL V+ = 16.5V, SHDN = 0V or V+ 3V ≤ V+ ≤ 16.5V 3V ≤ V+ ≤ 16.5V Current-Limit Trip Level (V+ – CS) VCS 3V ≤ V+ ≤ 16.5V TYP 82 MAX ±1 180 160 210 210 UNITS % 88 87 1.6 MAX77_C/E MAX77_M 0.4 240 260 µA V V mV ±1 µA Switch Maximum On-Time tON (max) V+ = 12V 12 16 20 µs Switch Minimum Off-Time tOFF (max) V+ = 12V 1.8 2.3 2.8 µs CS Input Current EXT Rise Time EXT Fall Time CEXT = 1nF, V+ = 12V CEXT = 1nF, V+ = 12V 50 50 MAX774/MAX775/MAX776 ELECTRICAL CHARACTERISTICS (continued) ns ns _______________________________________________________________________________________ 3 MAX774 EFFICIENCY vs. LOAD CURRENT VOUT = -5V (NON-BOOTSTRAPPED) VIN = 5V 70 80 VIN = 4V EFFICIENCY (%) VIN = 15V ILOAD = 100mA 80 EFFICIENCY (%) VIN = 3V 90 MA774/5/6--1b VIN = 5V 80 EFFICIENCY (%) 90 MAX1774/5/6-01a 90 MAX774 EFFICIENCY vs. TEMPERATURE MAX774/5/6-2 MAX774 EFFICIENCY vs. LOAD CURRENT VOUT = -5V (BOOTSTRAPPED) VIN = 15V 70 ILOAD = 600mA ILOAD = 1A 70 60 60 60 50 50 50 VIN = 5V BOOTSTRAPPED 100 10 1000 -40 0 20 40 60 80 TEMPERATURE (°C) MAX776 EFFICIENCY vs. LOAD CURRENT VOUT = -15V (BOOTSTRAPPED) MAX776 EFFICIENCY vs. LOAD CURRENT VOUT = -15V (NON-BOOTSTRAPPED) MAX775 EFFICIENCY vs. OUTPUT CURRENT VOUT = -12V (BOOTSTRAPPED) 80 VIN = 3V 70 60 VIN = 15V EFFICIENCY (%) EFFICIENCY (%) VIN = 4V VIN = 6V VIN = 4V 70 60 50 100 1000 VIN = 8V VIN = 4V 70 60 50 10 VIN = 5V 80 VIN = 5V 50 1 100 10 1 1000 100 10 1000 LOAD CURRENT (mA) LOAD CURRENT (mA) OUTPUT CURRENT (mA) MAX774/MAX775/MAX776 EFFICIENCY vs. LOAD CURRENT VOUT = -24V (NON-BOOTSTRAPPED) MAX774/MAX775/MAX776 EFFICIENCY vs. LOAD CURRENT VOUT = -24V OUTPUT (ZENER CONNECTION) MAX774 EFFICIENCY vs. INPUT VOLTAGE VOUT = -5V AT 100mA VIN = 5V VIN = 6V 88 86 EFFICIENCY (%) 80 VIN = 4V 70 EFFICIENCY (%) VIN = 5V 80 90 MA774/5/6--1g VIN = 6V MA774/5/6--1f 90 VIN = 4V 70 60 60 50 50 100 90 MA774/5/6-1d 90 VIN = 5V 1 -20 MA774/5/6--1e 1 LOAD CURRENT (mA) VIN = 6V 80 EFFICIENCY (%) 1000 100 MA774/5/6-1c 90 10 LOAD CURRENT (mA) BOOTSTRAPPED MAX774/5/6-3 1 EFFICIENCY (%) MAX774/MAX775/MAX776 _______________________________________________________________ (TA = +25°C, unless otherwise noted.) 84 82 80 NON-BOOTSTRAPPED 78 76 VOUT = -5V AT 100mA 1 10 100 LOAD CURRENT (mA) 4 1000 74 1 10 100 LOAD CURRENT (mA) 1000 2 4 6 8 10 12 INPUT VOLTAGE (V) _______________________________________________________________________________________ 14 16 4.5 3.5 VOUT = -5V 3.0 4.0 VOUT = -24V 3.5 3.0 2.5 1000 100 10 LOAD CURRENT (mA) EXT RISE AND FALL TIMES vs. TEMPERATURE EXT RISE AND FALL TIMES vs. TEMPERATURE 500 110 5V FALL 70 60 12V RISE 50 CEXT = 5nF 4 6 8 10 12 14 16 INPUT VOLTAGE (V) SWITCH ON-TIME vs. TEMPERATURE 17 V+ = 5V 5V RISE 350 300 250 16 5V FALL 200 12V RISE 150 40 12V FALL 30 100 12V FALL 50 20 -60 -40 -20 0 20 40 60 80 100 120 140 15 -60 -40 -20 0 20 40 60 -60 80 100 120 140 60 0 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) SWITCH OFF-TIME vs. TEMPERATURE SWITCH ON-TIME/OFF-TIME RATIO SHUTDOWN CURRENT vs. TEMPERATURE 7.8 V+ = 5V 3.5 3.0 7.4 7.2 ICC (µA) tON/tOFF RATIO (µs/µs) 7.6 2.0 4.0 120 MAX774/5/6-7 V+ = 5V MAX774/5/6-6 8.0 MAX761-13 2.5 tOFF (µs) 2 ton (µs) 80 tRISE & tFALL (ns) 5V RISE 90 1200 1000 450 400 100 1400 1000 MAX774/5/6-10 120 1 LOAD CURRENT (mA) CEXT = 1nF BOOTSTRAPPED 1600 800 0.1 MAX774/5/6-9 130 100 10 1800 NON-BOOTSTRAPPED VOUT = -5V 2.5 1 tRISE & tFALL (ns) VOUT = -15V VOUT = -5V 2000 LOAD CURRENT (mA) VOUT = -12V MAX774/5/6-16 VOUT = -12V START-UP VOLTAGE (V) START-UP VOLTAGE (V) 4.5 2200 MA744/5/6-15 VOUT = -15V 4.0 5.0 MA744/5/6-14 5.0 MAX774 MAXIMUM LOAD vs. INPUT VOLTAGE START-UP VOLTAGE vs. LOAD CURRENT (NON-BOOTSTRAPPED) MAX761-13 START-UP VOLTAGE vs. LOAD CURRENT (BOOTSTRAPPED) 7.0 6.8 2.5 V+ = 15V 2.0 1.5 6.6 V+ = 8V 1.0 6.4 1.5 -60 0 60 TEMPERATURE (°C) 120 6.2 0.5 6.0 0 V+ = 4V -60 -40 -20 0 20 40 60 80 100 120 140 TEMPERATURE (°C) -60 -40 -20 0 20 40 60 80 100 120 140 TEMPERATURE (°C) _______________________________________________________________________________________ 5 MAX774/MAX775/MAX776 __________________________________________________________ (TA = +25°C, unless otherwise noted.) OPERATING SUPPLY CURRENT vs. TEMPERATURE REFERENCE TEMPERATURE COEFFICIENT 76 V+ = 10V ICC (µA) 74 72 V+ = 3V MAX774/5/6-12 1.504 REFERENCE OUTPUT (V) V+ = 16.5V 78 70 1.506 MAX774/5/6-8 80 68 1.502 1.500 1.498 1.496 1.494 1.492 66 -60 -40 -20 0 20 40 60 80 100 120 140 -60 -40 -20 TEMPERATURE (°C) 220 215 210 205 200 195 190 80 100 120 140 MAX774/5/6-13 200 IREF = 10µA 150 IREF = 50µA 100 50 IREF = 100µA 0 185 -60 -40 -20 0 20 40 60 80 100 120 140 TEMPERATURE (°C) 6 40 60 250 REFERENCE OUTPUT RESISTANCE (Ω) 225 20 REFERENCE OUTPUT RESISTANCE MAX774/5/6-11 230 0 TEMPERATURE (°C) CS TRIP LEVEL 235 CS TRIP LEVEL (mV) MAX774/MAX775/MAX776 __________________________________________________________ (TA = +25°C, unless otherwise noted.) -60 -40 -20 0 20 40 60 80 100 120 140 TEMPERATURE (°C) _______________________________________________________________________________________ INDUCTOR CURRENT NEAR FULL LOAD OPERATING WAVEFORMS A 1A/div B 0A C 20µs/div 10µs/div CIRCUIT OF FIGURE 2 VOUT = -5V, V+ = 4.7V ILOAD = 1.05A (1A/div) CIRCUIT OF FIGURE 2 V+ = 6.5V, ILOAD = 1A, VOUT = -5V A: OUTPUT RIPPLE, 200mV/div B: EXT WAVEFORM, 10V/div C: INDUCTOR CURRENT, 2A/div CONTINUOUS CONDUCTION AT ONE-HALF CURRENT LIMIT ENTRY/EXIT FROM SHUTDOWN A 1A/div B 0A 20µs/div CIRCUIT OF FIGURE 2 ILOAD = 300mA, VOUT = -5V V+ = 8V, L = 22µH 2ms/div CIRCUIT OF FIGURE 2 V+ = 6V, ILOAD = 1A, VOUT = -5V A: SHUTDOWN PULSE, 0V TO V+, 5V/div B: VOUT, 2V/div _______________________________________________________________________________________ 7 MAX774/MAX775/MAX776 __________________________________________________________ (TA = +25°C, unless otherwise noted.) MAX774/MAX775/MAX776 __________________________________________________________ (TA = +25°C, unless otherwise noted.) LOAD-TRANSIENT RESPONSE LINE-TRANSIENT RESPONSE A A B B 100µs/div 2ms/div CIRCUIT OF FIGURE 2 V+ = 6V, VOUT = -5V A: ILOAD, 30mA TO 1A, 1A/div B: VOUT, 100mV/div, AC-COUPLED CIRCUIT OF FIGURE 2 VOUT = -5V, ILOAD = 1A A: V+, 3V TO 8V, 5V/div B: VOUT, 100mV/div, AC-COUPLED ___________________________________________________________________ 8 1 OUT 2 FB 3 SHDN 4 REF 5 V+ 6 CS 7 EXT 8 GND µ µ µ _______________________________________________________________________________________ MAX774/MAX775/MAX776 V+ FB MODE COMPARATOR REF MAX774 MAX775 MAX776 50mV SHDN ERROR COMPARATOR OUT N 1.5V REFERENCE Q TRIG ONE-SHOT FROM V+ S TRIG Q EXT Q R ONE-SHOT FROM OUT CURRENT COMPARATOR CS 0.1V (HALF CURRENT) 0.2V (FULL CURRENT) CURRENT CONTROL CIRCUITS FROM V+ GND _______________________________ µ µ _______________________________________________________________________________________ 9 MAX774/MAX775/MAX776 VIN VIN C2 0.1µF C1 150µF 1 OUT 3 2 4 V+ 1 5 MAX774 SHDN MAX775 CS 6 MAX776 FB R2 R1 0.07Ω EXT C1 150µF Q1 Si9435 P 7 2 C2 0.1µF GND 8 1N5822/ MBR340 L1 22µH C3 0.1µF C4* MAX774 -5 3 to 15 1 MAX775 -12 3 to 8 0.5 MAX776 -15 3 to 5 0.4 R3 0.07Ω SHDN MAX774 FB MAX775 CS 6 MAX776 7 REF GND 8 L1 22µH NOTE: Si9435 HAS VGS OF 20V MAX µ VIN 1 OUT V+ 5 R3 0.07Ω C1 150µF C2 0.1µF R1 C3 0.1µF 3 SHDN MAX774 2 4 FB REF MAX775 CS 6 MAX776 7 EXT GND 8 L1 22µH Q1 Si9435 P VOUT 1N5822/ MBR340 C4* * MAX774 = 330µF, 10V MAX775, MAX776 = 120µF, 20V 10 VOUT 1N5822/ MBR340 C4* MAX775, MAX776 = 120µF, 20V OUTPUT CURRENT (A) R2 Q1 Si9435 P * MAX774 = 330µF, 10V MAX775, MAX776 = 120µF, 20V INPUT VOLTAGE (V) 5 EXT 4 * MAX774 = 330µF, 10V OUTPUT VOLTAGE (V) V+ R1 VOUT REF C3 0.1µF PRODUCT 3 OUT ______________________________________________________________________________________ RZ 1 OUT GND 8 R2 2 FB R1 4 MAX774 MAX775 MAX776 REF 0.1µF 6V ≤ VZ + VIN ≤ 10V VOUT – VZ > IZ RZ IZ = ZENER BREAKDOWN CURRENT VZ = ZENER BREAKDOWN VOLTAGE VIN = INPUT SUPPLY VOLTAGE ____________________________ µ µ µ µ ( R2 _______ VOUT ___ = R1 VREF VOUT ______ = 10µA) R2 ______________________________________________________________________________________ 11 MAX774/MAX775/MAX776 VOUT 0.1µF RSENSE = 0.06Ω 2000 1500 1000 RSENSE = 0.07Ω RSENSE = 0.08Ω 500 0 RSENSE = 0.09Ω VOUT = -5V 3 4 5 6 1000 VOUT = -12V 800 RSENSE = 0.05Ω RSENSE = 0.06Ω RSENSE = 0.07Ω 600 400 RSENSE = 0.08Ω RSENSE = 0.09Ω 200 0 7 8 9 10 11 12 13 14 15 INPUT VOLTAGE (V) µ 3 4 5 6 7 INPUT VOLTAGE (V) µ [V+(min) - VSW(max)] x 12µs L(max) ≤ _______________________________ ILIM(max) VIN 1 VOUT 6 _______ < — t OFF(min) = ___________ t ON(max) [V+(max) - VSW(min)] x 0.3µs L(min) ≥ _______________________________ δ(I) x ILIM(min) µ µ µ 12 MAX775-FIG07 MAX775-fig6 MAXIMUM OUTPUT CURRENT (mA) RSENSE = 0.05Ω MAXIMUM OUTPUT CURRENT (mA) MAX774/MAX775/MAX776 2500 ______________________________________________________________________________________ 8 9 500 400 300 200 RSENSE = 0.08Ω RSENSE = 0.09Ω 600 MAX776-FIG09 600 800 MAXIMUM OUTPUT CURRENT (mA) MAX776-FIG08 MAXIMUM OUTPUT CURRENT (mA) VOUT = -15V RSENSE = 0.05Ω RSENSE = 0.06Ω RSENSE = 0.07Ω MAX774/MAX775/MAX776 700 VOUT = -24V RSENSE = 0.05Ω RSENSE = 0.06Ω RSENSE = 0.07Ω 400 200 RSENSE = 0.08Ω RSENSE = 0.09Ω 0 100 3 4 5 6 INPUT VOLTAGE (V) 7 3 4 5 6 7 8 9 10 11 12 13 14 15 INPUT VOLTAGE (V) • • • ______________________________________________________________________________________ 13 MAX774/MAX775/MAX776 SUPPLIER PHONE FAX Coiltronics (407) 241-7876 (407) 241-9339 Gowanda (716) 532-2234 (716) 532-2702 INDUCTORS Sumida USA (708) 956-0666 (708) 956-0702 Sumida Japan 81-3-3607-5111 81-3-3607-5144 Kemet (803) 963-6300 (803) 963-6322 Matsuo (714) 969-2491 (714) 960-6492 Nichicon (708) 843-7500 (708) 843-2798 Sanyo USA (619) 661-6835 (619) 661-1055 Sanyo Japan 81-7-2070-6306 81-7-2070-1174 Sprague (603) 224-1961 (603) 224-1430 United Chemi-Con (714) 255-9500 (714) 255-9400 Motorola (800) 521-6274 (602) 952-4190 Nihon USA (805) 867-2555 (805) 867-2556 Nihon Japan 81-3-3494-7411 81-3-3494-7414 Harris (407) 724-3729 (407) 724-3937 International Rectifier (310) 322-3331 (310) 322-3332 Siliconix (408) 988-8000 (408) 970-3950 CAPACITORS VOUT x IOUT x ESR IOUT x tOFF(min) ∆Vp-p = _____________________ + _________________ C VIN µ DIODES POWER MOSFETS CURRENT-SENSE RESISTORS IRC (704) 264-8861 (704) 264-8866 µ 14 ______________________________________________________________________________________ TEMP. RANGE PIN-PACKAGE MAX775CPA 0°C to +70°C 8 Plastic DIP MAX775CSA MAX775C/D MAX775EPA MAX775ESA MAX775MJA MAX776CPA MAX776CSA MAX776C/D MAX776EPA MAX776ESA MAX776MJA 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 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 8 SO Dice* 8 Plastic DIP 8 SO 8 CERDIP 8 Plastic DIP 8 SO Dice* 8 Plastic DIP 8 SO 8 CERDIP ________________________ OUT GND EXT FB .109" (2.769mm) CS SHDN * Contact factory for dice specifications. REF V+ 0.080 (2.032mm) TRANSISTOR COUNT: 442; SUBSTRATE CONNECTED TO V+. _________________________________________________________________ DIM E A A1 B C D E e H h L α H INCHES MAX MIN 0.069 0.053 0.010 0.004 0.019 0.014 0.010 0.007 0.197 0.189 0.157 0.150 0.050 BSC 0.244 0.228 0.020 0.010 0.050 0.016 8˚ 0˚ MILLIMETERS MIN MAX 1.35 1.75 0.10 0.25 0.35 0.49 0.19 0.25 4.80 5.00 3.80 4.00 1.27 BSC 5.80 6.20 0.25 0.50 0.40 1.27 0˚ 8˚ 21-325A h x 45˚ D α A 0.127mm 0.004in. e A1 C L 8-PIN PLASTIC SMALL-OUTLINE PACKAGE B ______________________________________________________________________________________ 15 MAX774/MAX775/MAX776 __________________________ PART MAX774/MAX775/MAX776 _________________________________________________________________ DIM D1 A A1 A2 A3 B B1 C D D1 E E1 e eA eB L α E E1 D A3 A A2 L A1 INCHES MAX MIN 0.200 – – 0.015 0.175 0.125 0.080 0.055 0.022 0.016 0.065 0.050 0.012 0.008 0.390 0.348 0.035 0.005 0.325 0.300 0.280 0.240 0.100 BSC 0.300 BSC 0.400 – 0.150 0.115 15˚ 0˚ MILLIMETERS MIN MAX – 5.08 0.38 – 3.18 4.45 1.40 2.03 0.41 0.56 1.27 1.65 0.20 0.30 8.84 9.91 0.13 0.89 7.62 8.26 6.10 7.11 2.54 BSC 7.62 BSC – 10.16 2.92 3.81 0˚ 15˚ 21-324A α C e B1 B eA 8-PIN PLASTIC DUAL-IN-LINE PACKAGE eB Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 16 __________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 (408) 737-7600 © 1993 Maxim Integrated Products is a registered trademark of Maxim Integrated Products.