(MAX8614A / MAX8614B) Dual-Output (+ and -) DC-DC

www.DataSheet4U.com 19-4014; Rev 0; 3/06 Dual-Output (+ and -) DC-DC Converters for CCD General Description The MAX8614A/MAX8614B dual-output step-up DC-DC converters generate both a positive and negative supply voltage that are each independently regulated. The positive output delivers up to 50mA while the inverter supplies up to 100mA with input voltages between 2.7V and 5.5V. The MAX8614A/MAX8614B are ideal for powering CCD imaging devices and displays in digital cameras and other portable equipment. The MAX8614A/MAX8614B generate an adjustable positive output voltage up to +24V and a negative output down to 16V below the input voltage. The MAX8614B has a higher current limit than the MAX8614A. Both devices operate at a fixed 1MHz frequency to ease noise filtering in sensitive applications and to reduce external component size. Additional features include pin-selectable power-on sequencing for use with a wide variety of CCDs, True Shutdown™, overload protection, fault flag, and internal soft-start with controlled inrush current. The MAX8614A/MAX8614B are available in a spacesaving 3mm x 3mm 14-pin TDFN package and are specified over the -40°C to +85°C extended temperature range. ♦ Dual Output Voltages (+ and -) ♦ Adjustable Up to +24V and Down to -10V at 5.5VIN ♦ Output Short/Overload Protection ♦ True Shutdown on Both Outputs ♦ Controlled Inrush Current During Soft-Start ♦ Selectable Power-On Sequencing ♦ Up to 90% Efficiency ♦ 1µA Shutdown Current ♦ 1MHz Fixed-Frequency PWM Operation ♦ Fault-Condition Flag ♦ Thermal Shutdown ♦ Small, 3mm x 3mm, 14-Pin TDFN Package Features MAX8614A/MAX8614B Ordering Information PART TEMP PINRANGE PACKAGE 14 TDFN -40°C to 3mm x 3mm +85°C (T1433-2) TOP MARK ABG ILIM BST/INV 0.44/0.33 MAX8614AETD+ Applications CCD Bias Supplies and OLED Displays Digital Cameras Camcorders and Portable Multimedia PDAs and Smartphones 14 TDFN -40°C to 3mm x 3mm +85°C (T1433-2) +Denotes lead-free package. MAX8614BETD+ ABH 0.8/0.75 Typical Operating Circuit INPUT (2.7V TO 5.5V) True Shutdown is a trademark of Maxim Integrated Products, Inc. Pin Configuration ONINV PGND PVP LXN VCC ONINV ONBST LXN VINV -7.5V TOP VIEW SEQ LXP VCC AVCC 14 13 12 11 10 9 8 REF AVCC SEQ MAX8614A MAX8614B FBN PVP REF MAX8614A MAX8614B + 1 ONBST 2 FBN 3 AVCC 4 REF 5 GND 6 FLT 7 FBP LXP FLT GND PGND FBP VBST +15V TDFN ________________________________________________________________ Maxim Integrated Products 1 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. Dual-Output (+ and -) DC-DC Converters for CCD MAX8614A/MAX8614B ABSOLUTE MAXIMUM RATINGS VCC, AVCC to GND...................................................-0.3V to +6V LXN to VCC .............................................................-18V to +0.3V LXP to PGND ..........................................................-0.3V to +33V REF, ONINV, ONBST, SEQ, FBN, FBP FLT to GND ..........................................-0.3V to (AVCC + 0.3)V PVP to GND ................................................-0.3V to (VCC + 0.3)V AVCC to VCC ..........................................................-0.3V to +0.3V PGND to GND .......................................................-0.3V to +0.3V Continuous Power Dissipation (TA = +70°C Multilayer Board) 14-Pin 3mm x 3mm TDFN (derate 18.2mW/°C above TA = +70°C) ............................................................1454.4mW Operating Temperature Range ...........................-40°C to +85°C Junction Temperature ......................................................+150°C Storage Temperature Range .............................-65°C to +150°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 (VCC = VAVCC = VONINV = VONBST = 3.6V, PGND = SEQ = GND, C6 = 0.22µF, C1 = 2.2µF, C2 = 4.7µF, Figure 1, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER AVCC and VCC Voltage Range UVLO Threshold UVLO Hysteresis Step-Up Output Voltage Adjust Range Inverter Output Voltage Adjust Range LXP Current Limit LXP Short-Circuit Current Limit LXN Current Limit LXN On-Resistance LXP On-Resistance PVP On-Resistance Maximum Duty Cycle Quiescent Current (Switching, No Load) Quiescent Current (No Switching, No Load) Shutdown Supply Current FBP Line Regulation FBN Line Regulation VINV - VCC (Note 2) MAX8614B MAX8614A MAX8614B MAX8614A MAX8614B MAX8614A VCC = 3.6V VCC = 3.6V VCC = 3.6V Step-up and inverter IAVCC IVCC IAVCC IVCC TA = +25°C TA = +85°C VCC = 2.7V to 5.5V VCC = 2.7V to 5.5V 82 VAVCC -16 0.7 0.34 0.90 0.52 0.65 0.28 0.8 0.44 1.05 0.61 0.75 0.33 0.6 0.625 0.15 90 0.75 2 400 8 0.1 0.1 -20 20 1.4 3 800 15 5 0.3 (Note 1) VCC rising CONDITIONS MIN 2.7 2.42 2.55 25 24 0 0.9 0.52 1.20 0.70 0.85 0.38 1.1 TYP MAX 5.5 2.66 UNITS V V mV V V A A A Ω Ω Ω % mA µA µA mV/D mV/ (D - 0.5) 2 _______________________________________________________________________________________ Dual-Output (+ and -) DC-DC Converters for CCD ELECTRICAL CHARACTERISTICS (continued) (VCC = VAVCC = VONINV = VONBST = 3.6V, PGND = SEQ = GND, C6 = 0.22µF, C1 = 2.2µF, C2 = 4.7µF, Figure 1, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER FBP Load Regulation FBN Load Regulation Oscillator Frequency Soft-Start Interval Overload-Protection Fault Delay FBP, FBN, REFERENCE REF Output Voltage REF Load Regulation REF Line Regulation FBP Threshold Voltage FBN Threshold Voltage FBP Input Leakage Current FBN Input Leakage Current LXN Input Leakage Current LXP Input Leakage Current PVP Input Leakage Current FLT Input Leakage Current FLT Input Resistance ONINV, ONBST, SEQ LOGIC INPUTS Logic-Low Input Logic-High Input Bias Current 2.7V < VAVCC < 5.5V 2.7V < VAVCC < 5.5V TA = +25°C 1.6 0.1 1 0.5 V V µA No load 0µA < IREF < 50µA 3.3V < VAVCC < 5.5V No load No load VFBP =1.025V FBN = -10mV VLXN = -12V VLXP = 23V VPVP = 0V VFLT = 3.6V TA = +25°C TA = +85°C TA = +25°C TA = +85°C TA = +25°C TA = +85°C TA = +25°C TA = +85°C TA = +25°C TA = +85°C TA = +25°C TA = +85°C -1 -5 -5 -5 -50 0.995 -10 -50 1.24 1.25 10 2 1.010 0 +5 +5 +5 +5 +0.1 +0.1 +0.1 +0.1 +0.1 +0.1 +0.1 +0.1 10 20 +1 +5 +5 +5 +50 5 1.025 +10 +50 1.26 V mV mV V mV nA nA µA µA µA µA Ω Step-up and inverter CONDITIONS ILXP = IILIMMIN, MAX8614B ILXP = IILIMMIN, MAX8614A ILXN = IILIMMIN, MAX8614B ILXN = IILIMMIN, MAX8614A 0.93 MIN TYP -15 -35 17.5 65 1 10 100 1.07 MAX UNITS mV/A mV/A MHz ms ms MAX8614A/MAX8614B Fault mode, TA = +25°C _______________________________________________________________________________________ 3 Dual-Output (+ and -) DC-DC Converters for CCD MAX8614A/MAX8614B ELECTRICAL CHARACTERISTICS (VCC = VAVCC = VONINV = VONBST = VEN = 3.6V, PGND = SEQ = GND, C6 = 0.22µF, C1 = 2.2µF, C2 = 6.7µF, Figure 1, TA = -40°C to +85°C, unless otherwise noted.) (Note 3) PARAMETER AVCC = VCC Voltage Range UVLO Threshold Step-Up Output Voltage Adjust Range Inverter Output Voltage Adjust Range LXP Current Limit LXP Short-Circuit Current Limit LXN Current Limit LXN On-Resistance PVP On-Resistance Maximum Duty Cycle Quiescent Current (Switching, No Load) Quiescent Current (No Switching, No Load) Oscillator Frequency FBP, FBN, REFERENCE REF Output Voltage FBP Threshold Voltage FBN Threshold Voltage ONINV, ONBST SEQ LOGIC INPUTS Logic-Low Input Logic-High Input 2.7V < VAVCC < 5.5V 2.7V < VAVCC < 5.5V 1.6 0.5 V V No load No load No load 1.235 0.995 -10 1.260 1.025 +10 V V mV VINV - VCC (Note 2) MAX8614B MAX8614A MAX8614B MAX8614A MAX8614B MAX8614A VCC = 3.6V VCC = 3.6V Step-up and inverter IAVCC IVCC IAVCC IVCC 0.93 82 1.4 3 800 15 1.07 (Note 1) VCC rising CONDITIONS MIN 3 2.42 VAVCC -16 0.7 0.34 0.9 0.52 0.65 0.28 TYP MAX 5.5 2.82 24 0 0.9 0.52 1.2 0.70 0.85 0.38 1.1 0.3 UNITS V V V V A A A Ω Ω % mA µA MHz Note 1: Output current and on-resistance are specified at 3.6V input voltage. The IC operates to 2.7V with reduced performance. Note 2: The specified maximum negative output voltage is referred to VCC, and not to GND. With VCC = 3.3V, the maximum negative output is then -12.7V. Note 3: Specifications to -40°C are guaranteed by design, not production tested. 4 _______________________________________________________________________________________ Dual-Output (+ and -) DC-DC Converters for CCD Typical Operating Characteristics (TA = +25°C, VCC = VAVCC = 3.6V, SEQ = GND, Figure 1, unless otherwise noted.) MAX8614A/MAX8614B MAXIMUM OUTPUT CURRENT vs. INPUT VOLTAGE MAX8614A/B toc01 MAXIMUM OUTPUT CURRENT vs. INPUT VOLTAGE MAX8614A/B toc02 POSITIVE OUTPUT EFFICIENCY vs. OUTPUT CURRENT 90 80 70 EFFICIENCY (%) 60 50 40 30 20 10 L = 2.2µH, C = 2.2µF 0.1 1 10 OUTPUT CURRENT (mA) 100 VCC = 3V VCC = 3.6V VCC = 4.2V VCC = 5V MAX8614A/B toc03 350 MAXIMUM OUTPUT CURRENT (mA) 300 VOUT = 10V 250 200 150 100 50 VOUT = 20V 0 2.5 3.0 3.5 4.0 4.5 INPUT VOLTAGE (V) 5.0 VOUT = 15V 300 MAXIMUM OUTPUT CURRENT (mA) . 250 200 150 100 VINV = -10V 50 0 VINV = -7.5V VINV = -5V 100 0 2.5 3.0 3.5 4.0 4.5 INPUT VOLTAGE (V) 5.0 5.5 5.5 POSITIVE OUTPUT EFFICIENCY vs. OUTPUT CURRENT MAX8614A/B toc04 NEGATIVE OUTPUT EFFICIENCY vs. OUTPUT CURRENT MAX8614A/B toc05 NEGATIVE OUTPUT EFFICIENCY vs. OUTPUT CURRENT 90 80 70 EFFICIENCY (%) 60 50 40 30 20 10 VCC = 4.2V VCC = 5V VCC = 3.6V VCC = 3V MAX8614A/B toc06 100 90 80 70 EFFICIENCY (%) 60 50 40 30 20 10 0 0.1 VCC = 5V 100 90 80 70 EFFICIENCY (%) 60 50 40 30