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| AIC1633 2-Cell, 200mA, Step-Up DC/DC Converter FEATURES High Efficiency Up To 87%. Adjustable Output Voltage with Two Resistors (AIC1633A) Power-Saving Shutdown Mode (7A typical). Internal 0.8A Switch. 120KHz Switching Rate. Adjustable Switch Current Limit. On-Chip Low Battery Detector. DESCRIPTION The AIC1633 is a high efficiency step up DC/DC converter. Only four external components are required to deliver a fixed voltage of 3V, 3.3V, or 5V. The output voltage can be externally set to an arbitrary value below breakdown voltage of the power switch for AIC1633A. Efficiency beyond 83% can be easily achieved at 70mA load with 2.2V to 3V input voltages. APPLICATIONS Pocket Organizers. Electronic Dictionaries. Cameras. Pagers. Bar-Code Scanners. LCD Displays. Battery Backup Supplies. Portable Instruments. Logic-controlled shutdown mode is provided for power saving. Switch current limit can be programmed with a resistor. The low battery detector can be configured as a linear regulator or a burst mode controller performing an extremely low supply current operation. 120KHz switching rate reduces the inductor size. Inductors of 47H to 150H inductance are recommended for most applications. TYPICAL APPLICATION CIRCUIT +VIN 470 R1 100H L + NORMAL 10K 22F C1 SD RILIM ILIM/SD VIN SW VOUT LBI LBO CGND +VOUT (3.3V) + LOAD 1N5819 D1 22F C2 TATAN SGND NOTE: VIN1.8V, VOUT7V AIC1633 High-Efficiency Step-Up DC/DC Converter Analog Integrations Corporation DS-1633-03 Mar 15, 00 4F, 9, Industry E. 9th Rd, Science Based Industrial Park, Hsinchu Taiwan, ROC TEL: 886-3-5772500 FAX: 886-3-5772510 www.analog.com.tw 1 AIC1633 ORDERING INFORMATION AIC1633 XXX PACKAGE TYPE N: PLASTIC DIP S: SMALL OUTLINE TEMPERATURE RANGE C=0C~+70C OUTPUT VOLTAGE DEFAULT: 3.3V 3: 3.0V 5: 5.0V A: Adjustable ORDER NUMBER AIC1633CN AIC1633-3CN AIC1633-5CN (PLASTIC DIP) AIC1633CS AIC1633-3CS AIC1633-5CS (PLASTIC SO) AIC1633ACN (PLASTIC DIP) AIC1633ACS (PLASTIC SO) PIN CONFIGURATION TOP VIEW ILIM/SD 1 VIN 2 SW 3 SGND 4 8 7 6 5 VOUT LBI LBO CGND TOP VIEW ILIM/SD 1 VIN 2 SW 3 GND 4 8 7 6 5 VOUT LBI LBO FB ABSOLUTE MAXIMUM RATINGS Supply Voltage ........................................................................................................ 7.0V Operating Temperature Range .................................................................... -20C ~ 80C Storage Temperature Range ................................................................. -65C ~ 150C TEST CIRCUIT Refer to Typical Application Circuit. ELECTRICAL CHARACTERISTICS PARAMETER Input Voltage Output Voltage ILOAD =70mA AIC1633 AIC1633-3 AIC1633-5 Switch off Current No Load Current Shutdown Mode Current Shutdown Recovery Time (VIN=3.0V, Ta=25C, unless otherwise specified.) TEST CONDITIONS MIN. 1.8 3.16 2.88 4.80 TYP. MAX. 7 UNIT V 3.3 3 5 105 3.44 3.12 5.20 140 V A A AIC1633/AIC1633-3 AIC1633-5 160 250 7 15 A VIN=2.5V, ILOAD =70mA 1.8 mS 2 AIC1633 ELECTRICAL CHARACTERISTICS PARAMETER Efficiency (CONTINUED) MIN. TYP. 87 86 0.6 0.6 0.5 0.6 0.5 90 1.17 120 1.22 0.617 1.75 1.25 45 1 10 10 150 1.27 0.636 TEST CONDITIONS ILOAD =70mA AIC1633/AIC1633-3 AIC1633-5 MAX. UNIT % Line Regulation ILOAD =40mA AIC1633, VIN =2.0~3.3V AIC1633-3, VIN =2.0~3.0V AIC1633-5, VIN =2.2~4.5V %VOUT Load Regulation ILOAD =170mA AIC1633/AIC1633-3 AIC1633-5 %VOUT KHz V V A Oscillator Frequency LBI Pin Trip Point FB Threshold Voltage SW "ON Resistance" LBO "ON Resistance" SW Off Leakage Input Pin Bias Current Output Pin Leakage AIC1633A AIC1633/AIC1633-3 AIC1633-5 VIN=2V 0.598 nA/Pin nA/Pin TYPICAL PERFORMANCE CHARACTERISTICS Switch Voltage vs Current 3 2.5 2 2 SW ON Resistance vs Temperature AIC1633/AIC1633-3 1.8 SW RDS ON () AIC1633-5 AIC1633/AIC1633-3 1.6 VSW (V) 1.5 1 0.5 1.4 1.2 AIC1633-5 Ta = 25C 0 0 0.5 1 1.5 2 2.5 1 0 10 20 30 40 50 60 70 80 ISW (A) Temperature (C) 3 AIC1633 TYPICAL PERFORMANCE CHARACTERISTICS (CONTINUED) No Load Supply Current vs Input Voltage 280 260 240 300 No Load Supply Current vs Temperature VIN=3V 260 Ta = 25C AIC1633/AIC1633-3 AIC1633-5 IS (A) 220 IS (A) 220 200 180 160 140 180 AIC1633/AIC1633-3 140 AIC1633-5 1 1.5 2 2.5 3 3.5 4 4.5 5 100 0 10 20 30 40 50 60 70 80 VIN (V) Temperature (C) Shutdown Mode Supply Current vs Input Voltage 8.2 9.4 Shutdown Mode Supply Current vs Temperature VIN=3V Ta = 25C 8 7.8 9 8.6 IS (A) 7.6 7.4 IS (A) 8.2 7.8 7.4 7.2 7 1 1.5 2 2.5 3 3.5 4 4.5 5 7 0 20 40 60 80 VIN (V) Temperature (C) Oscillator Frequency vs Input Voltage 130 Oscillator Frequency vs Temperature 123 Ta = 25C 120 VIN=3V 122 Frequency (KHz) 110 100 90 80 70 60 Frequency (KHz) 121 120 119 118 117 1 1.5 2 2.5 3 3.5 4 4.5 5 0 10 20 30 40 50 60 70 80 VIN (V) Temperature (C) 4 AIC1633 TYPICAL PERFORMANCE CHARACTERISTICS (CONTINUED) Maximum Load Current vs Switch Current Limit Resistance 300 250 200 350 300 250 200 150 100 Maximum Load Current vs Switch Current Limit Resistance VIN=1.8V VIN=2.0V VIN=2.2V VIN=2.5V VIN=3V VIN=3.3V AIC1633-5 Ta=25C 5% VOUT Drop AIC1633/AIC1633-3 Ta=25C 5% VOUT Drop IL (mA) 150 VIN=3V VIN=1.8V VIN=2.0V VIN=2.2V VIN=2.5V 600 100 50 0 IL (mA) 50 0 0 20 40 60 80 100 120 0 100 200 300 400 500 RILIM (K) RILIM (K) BLOCK DIAGRAM ILIM/SD Current Limit + 0.617V VOUT VIN 100mV SW A + Shutdown + OSC 1.22V LBI LBO SGND CGND 5 AIC1633 PIN DESCRIPTIONS AIC1633-30/ AIC1633-33 / AIC1633-50 PIN 1: ILIM/SD- 1. Connected to VIN pin through a resistor to set the switch peak current. It serves to protect IC and inductor, as well as to improve efficiency and output ripples. However, the current limit resistor limits supply capability of the AIC1633. (See typical performance characteristics). The ILIM/SD pin should be shorted to VIN pin if limiting on switch peak current is not intended. 2. The AIC1633 goes in shutdown mode and consumes less than 10A when ILIM/SD pin is pulled to ground. PIN 2: VIN - Input supply. PIN 3: SW - Drain of the power switch, to be connected to inductor/ diode. PIN 4:SGND - Ground connected to source of power switch. PIN 5:CGND - Ground for control circuits of the IC. It should be separated from SGND to avoid the interference. PIN 6:LBO - Open drain output of the battery low detector, with 45 "ON resistance" at VIN=2V. It is pulled low when the voltage on LBI pin is below 1.22V. PIN 7:LBI - The noninverting input of the battery low detector, of which the inverting input is internally connects to 1.22V voltage reference. PIN 8:VOUT - The output voltage feedbacks to the IC through this pin. AIC1633A PIN 1:ILIM/SD- 1. Connected to VIN pin through a resistor to set the switch peak current. It serves to protect IC and inductor, as well as to improve efficiency and output ripples. However, the current limit resistor limits supply capability of the AIC1633A. (See typical performance characteristics). The ILIM/SD pin should be shorted to VIN pin if limiting on switch peak current is not intended. 2. The AIC1633A goes in shutdown mode and consumes less than 10A when ILIM/SD pin is pulled to ground. PIN 2: VIN PIN 3: SW - Input supply. - Drain of the power switch, to be connected to inductor/ diode. - Output voltage can either be internally set to 5 volt by grounding FB pin, or be externally set to an arbitrary voltage by applying to FB pin the divider voltage of two divider resistors. VOUT voltage is given by the following equation: PIN 4: GND - Ground. PIN 5: FB R1 VOUT = -1 R2 0.617 where R1 = Resistor connected between FB pin and VOUT pin. R2 = Resistor connected between FB pin and ground. VOUT=Output voltage to be set. PIN 6: LBO - Open drain output of the battery low detector, with 45 "ON resistance" at VIN=2V. It is pulled low when the voltage on LBI pin is below 1.22V. 6 AIC1633 AIC1633A (continued) PIN 7: LBI - The non-inverting input of the battery low detector, of which the inverting input is internally connects to 1.22V voltage reference. PIN 8: VOUT- The output voltage feedbacks to the IC through this pin. If output voltage was externally set, the VOUT pin can be tied to any low impedance node with voltage between the external power switch threshold and 7V APPLICATION EXAMPLES +VOUT (+3V) 95 +VIN 470 R1 90 Efficiency (%) VIN=3.0V 85 LOAD L1 82H + 22F C1 ILIM/SD VIN SW VOUT LBI LBO CGND 80 VIN=2.2V VIN=2.0V 75 70 + C2 22F SGND 1N5819 D1 VIN=1.8V AIC1633-3 65 0 30 60 90 120 150 Load Current (mA) Fig. 1 3V Output Step-Up Converter +VOUT (+5V) +VIN 470 R1 + LOAD L1 82H 22F C1 ILIM/SD VIN SW SGND + 22F C2 1N5819 D1 VOUT 95 90 VIN=4.5V VIN=2.2V VIN=3.0V Efficiency (%) LBI LBO CGND 85 80 75 70 65 VIN=1.8V AIC1633-5 0 20 40 Load Current (mA) 60 80 100 120 140 160 Fig. 2 5V Output Step-Up Converter 7 AIC1633 APPLICATION EXAMPLES (CONTINUED) +VOUT (+3V) +VIN 470 R1 85 VIN=1.6V 80 LOAD + 1N5819 D1 L1 100H 10F C1 Efficiency (%) ILIM/SD VIN SW SGND VOUT LBI LBO CGND VIN=1.4V VIN=1.0V VIN=0.8V VIN=1.2V 75 70 65 + 22F C2 AIC1633-3 60 0 5 10 15 20 25 30 35 Load Current (mA) Start-Up VIN Voltage = 1.4V Fig. 3 1-Cell Input 3V Output Step-Up Converter 2SB1424 Q1 +VIN 470 R1 150H L1 + C2 10F 15K 10K RILIM ILIM/SD VIN SW + C1 22F SGND 1N5819 D1 VOUT LBI LBO CGND 20K R4 10F R5 R2 3.3K R3 62K 90 +VOUT (+5V) 85 VIN=5V VIN=6V VIN=3V VIN=3.5V VIN=4.5V VIN=4V Efficiency (%) + 80 C4 75 LOAD 70 0 VIN=7V 20 40 60 80 100 120 140 160 180 200 220 240 AIC1633-5 Load Current (mA) Fig. 4 +VIN 1K R1 1K R2 10F + C2 + 10F C1 1K R3 2SB1424 Q1 1N5819 D1 82H L1 4-Cell Input Step-Up/ Step-Down Converter +VOUT (+3V) 33K R4 + 22F C3 24K R5 LOAD 100 VIN=3V 95 ILIM/SD VIN SW SGND VOUT LBI LBO CGND Efficiency (%) 90 VIN=4V VIN=5V 85 80 VIN=7V VIN=6V 0 20 40 60 80 100 120 140 160 180 200 220 AIC1633-3 75 VOUT Ripple May Be Large at VIN=3V Condition Load Current (mA) Fig. 5 3-Cell Input 3V Output Step-Down Converter 8 AIC1633 APPLICATION EXAMPLES L1 50H +VIN 0.1F C2 + 100F C1 Q2 IRFZ34 D1 MBR360 Q1 9014 D3 Q3 1N4148 9014 SGND CGND 0 (CONTINUED) 100 1N4148 R4 VOUT (+5V) 100 80 Efficiency (%) 1N4148 D4 R1 4.3K 100K R3 10K R2 ZD1 5.1V Q4 9014 + C3 10F D5 60 VIN=8V VIN=12V VIN=16V VIN=20V ILIM\SD VOUT VIN SW LBI LBO + 220F C4 40 20 D2 1N4148 AIC1633-5 0.005 0.05 Load Current (mA) 0.5 5 Fig. 6 Boost-Driven 5V Output Step-Down Converter +VOUT +VIN 470 R1 82H L1 + ILIM/SD VOUT 22F C1 VIN SW GND LBI LBO FB R2 R1 LOAD 22F C2 + 1N5819 D1 AIC1631A Fig.7 Adjustable Output Voltage Step-Up Converter 9 AIC1633 PHYSICAL DIMENSION 8 LEAD PLASTIC SO (unit: mm) D SYMBOL A H E MIN 1.35 0.10 0.33 0.19 4.80 3.80 5.80 0.40 MAX 1.75 0.25 0.51 0.25 5.00 4.00 6.20 1.27 A1 B C D E e A C A1 e H L L 1.27(TYP) B 8 LEAD PLASTIC DIP D (unit: mm) SYMBOL A1 A2 b C E MIN 0.381 2.92 0.35 0.20 9.01 7.62 6.09 -- 2.92 MAX -- 4.96 0.56 0.36 10.16 8.26 7.12 10.92 3.81 E1 D E C A2 A1 L E1 e eB L 2.54 (TYP) eB b e 10 |
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