AIC1633 2-Cell, 200mA, Step-Up DC/DC Converter FEATURES High Efficiency Up To 87%. Adjustable Output Voltage with Two Resistors (AIC1633A) 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 Power-Saving Shutdown Mode (7µA typical). Internal 0.8A Switch. 120KHz Switching Rate. Adjustable Switch Current Limit. On-Chip Low Battery Detector. 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 Logic-controlled shutdown mode is provided for Pocket Organizers. Electronic Dictionaries. Cameras. Pagers. Bar-Code Scanners. LCD Displays. Battery Backup Supplies. Portable Instruments. 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 47µH to 150µH inductance are recommended for most applications. TYPICAL APPLICATION CIRCUIT 470Ω +VIN 1N5819 D1 +VOUT (3.3V) R1 100µH L NORMAL 10K + 22µF C1 SD + LOAD 22µF C2 TATAN RILIM ILIM/SD VOUT VIN LBI SW LBO SGND NOTE: VIN≥1.8V, VOUT≤7V CGND AIC1633 High-Efficiency Step-Up DC/DC Converter Analog Integrations Corporation 4F, 9, Industry E. 9th Rd, Science Based Industrial Park, Hsinchu Taiwan, ROC DS-1633-03 Mar 15, 00 TEL: 886-3-5772500 FAX: 886-3-5772510 www.analog.com.tw 1 AIC1633 ORDERING INFORMATION AIC1633 XXX PIN CONFIGURATION ORDER NUMBER AIC1633CN AIC1633-3CN AIC1633-5CN (PLASTIC DIP ) PACKAGE TYPE N: PLASTIC DIP S: SMALL OUTLINE TEMPERATURE RANGE C=0°C~+70°C OUTPUT VOLTAGE DEFAULT: 3.3V 3: 3.0V 5: 5.0V A: Adjustable TOP VIEW AIC1633CS AIC1633-3CS AIC1633-5CS (PLASTIC SO) AIC1633ACN (PLASTIC DIP ) 8 VIN 2 7 LBI SW 3 6 LBO SGND 4 5 CGND ILIM/SD 1 8 VOUT VIN 2 7 LBI SW 3 6 LBO GND 4 5 FB TOP VIEW AIC1633ACS (PLASTIC SO) VOUT ILIM/SD 1 ABSOLUTE MAXIMUM RATINGS Supply Voltage .........................................................……………………....................... 7.0V Operating Temperature Range ...................................……….……................. -20°C ~ 80°C Storage Temperature Range .........................................……..………....... TEST CIRCUIT ELECTRICAL CHARACTERISTICS -65°C ~ 150°C Refer to Typical Application Circuit. PARAMETER (VIN=3.0V, Ta=25°°C, unless otherwise specified.) TEST CONDITIONS Input Voltage Output Voltage MAX. UNIT 7 V V ILOAD =70mA AIC1633 3.16 3.3 3.44 AIC1633-3 2.88 3 3.12 AIC1633-5 4.80 5 5.20 105 140 AIC1633/AIC1633-3 160 AIC1633-5 250 7 Shutdown Mode Current Shutdown Recovery Time TYP. 1.8 Switch off Current No Load Current MIN. VIN=2.5V, ILOAD =70mA 1.8 µA µA 15 µA mS 2 AIC1633 ELECTRICAL CHARACTERISTICS PARAMETER (CONTINUED) TEST CONDITIONS MIN. MAX. UNIT ILOAD =70mA Efficiency AIC1633/AIC1633-3 87 AIC1633-5 86 % ILOAD =40mA Line Regulation AIC1633, VIN =2.0~3.3V 0.6 AIC1633-3, VIN =2.0~3.0V 0.6 AIC1633-5, VIN =2.2~4.5V 0.5 %VOUT ILOAD =170mA Load Regulation AIC1633/AIC1633-3 0.6 AIC1633-5 0.5 Oscillator Frequency LBI Pin Trip Point FB Threshold Voltage AIC1633A SW “ON Resistance” AIC1633/AIC1633-3 AIC1633-5 %VOUT 90 120 150 KHz 1.17 1.22 1.27 V 0.598 0.617 0.636 V 1.75 Ω 1.25 VIN=2V LBO “ON Resistance” Ω 45 SW Off Leakage 1 µA Input Pin Bias Current 10 nA/Pin Output Pin Leakage 10 nA/Pin TYPICAL PERFORMANCE CHARACTERISTICS Switch Voltage vs Current SW ON Resistance vs Temperature 2 3 2.5 1.8 AIC1633/AIC1633-3 SW RDS ON (Ω) AIC1633-5 2 VSW (V) TYP. 1.5 1 AIC1633/AIC1633-3 1.6 1.4 AIC1633-5 1.2 0.5 Ta = 25°C 0 0 0.5 1 1.5 ISW (A) 2 2.5 1 0 10 20 30 40 50 60 70 80 Temperature (°C) 3 AIC1633 TYPICAL PERFORMANCE CHARACTERISTICS (CONTINUED) No Load Supply Current vs Input Voltage No Load Supply Current vs Temperature 300 280 VIN=3V Ta = 25°C 260 260 AIC1633/AIC1633-3 220 IS (µA) IS (µA) 240 AIC1633-5 200 180 AIC1633/AIC1633-3 220 180 AIC1633-5 140 160 140 1 1.5 2 2.5 3 3.5 4 4.5 100 5 0 40 50 60 70 Shutdown Mode Supply Current vs Temperature 80 9.4 9 7.8 8.6 IS (µA) IS (µA) 30 Shutdown Mode Supply Current vs Input Voltage 8 7.6 7.8 7.2 7.4 1 1.5 2 2.5 3 3.5 4 4.5 7 5 VIN=3V 8.2 7.4 0 20 40 60 80 VIN (V) Temperature (°C) Oscillator Frequency vs Input Voltage Oscillator Frequency vs Temperature 130 123 Ta = 25°C VIN=3V 120 Frequency (KHz) 122 110 100 90 80 121 120 119 118 70 60 20 Temperature (°C) Ta = 25°C 7 10 VIN (V) 8.2 Frequency (KHz) 1 1.5 2 2.5 3 VIN (V) 3.5 4 4.5 5 117 0 10 20 30 40 50 60 70 80 Temperature (°C) 4 AIC1633 TYPICAL PERFORMANCE CHARACTERISTICS (CONTINUED) Maximum Load Current vs Switch Current Limit Resistance 300 AIC1633/AIC1633-3 Ta=25°C 5% VOUT Drop 250 Maximum Load Current vs Switch Current Limit Resistance 350 VIN=1.8V 300 250 IL (mA) IL (mA) 200 VIN=3V 150 VIN=1.8V 100 0 VIN=2.2V 0 100 200 VIN=2.2V 200 VIN=2.5V 150 VIN=3V VIN=3.3V 100 VIN=2.0V 50 300 VIN=2.5V 400 500 50 600 0 0 20 40 RILIM (KΩ) AIC1633-5 Ta=25°C 5% VOUT Drop VIN=2.0V 60 80 100 120 RILIM (KΩ) BLOCK DIAGRAM ILIM/SD - Current Limit VOUT + VIN 100mV SW 0.617V + LBI - Shutdown + A 1.22V LBO OSC SGND CGND 5 AIC1633 PIN DESCRIPTIONS AIC1633-30/ AIC1633-33 / AIC1633-50 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 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 10µA 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 45Ω “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. 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 10µA 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: GND - Ground. PIN 5: FB - 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: 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 45Ω “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 APPLICATION EXAMPLES 95 +VOUT (+3V) +VIN L1 82µH LOAD ILIM/SD + 22µF C1 VIN LBI SW LBO CGND SGND + 1N5819 D1 C2 22µF VOUT Efficiency (%) 90 470Ω R1 30 60 90 120 150 95 470Ω R1 90 ILIM/SD + L1 82µH 22µF C1 LBI LBO SGND CGND AIC1633-5 1N5819 D1 85 VIN=3.0V VIN=2.2V 80 VIN=1.8V 75 70 65 Fig. 2 VIN=4.5V VOUT VIN SW 22µF C2 VIN=1.8V 3V Output Step-Up Converter +VIN + VIN=2.0V 75 Load Current (mA) +VOUT LOAD VIN=2.2V 80 65 0 AIC1633-3 Fig. 1 (+5V) VIN=3.0V 85 70 Efficiency (%) 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 - The non-inverting input of the battery low detector, of which the inverting input is internally connects to 1.22V voltage reference. 0 20 40 60 80 100 Load Current (mA) 120 140 160 5V Output Step-Up Converter 7 AIC1633 APPLICATION EXAMPLES +VOUT 470Ω R1 +VIN (+3V) (CONTINUED) 85 VIN=1.6V 80 10µF C1 L1 100µH VIN LBI SW LBO Efficiency (%) 1N5819 D1 VOUT ILIM/SD + LOAD CGND SGND VIN=1.4V VIN=1.0V 75 VIN=1.2V VIN=0.8V 70 65 + AIC1633-3 22µF C2 60 0 5 10 15 20 25 30 35 Load Current (mA) Start-Up VIN Voltage = 1.4V 1-Cell Input 3V Output Step-Up Converter 2SB1424 Q1 15K +VIN 10K RILIM 470Ω R1 R5 C2 10µF VIN LBI SW LBO 1N5819 D1 10µF + C2 + 10µF C1 20K R4 1N5819 D1 VIN=4.5V VIN=3V VIN=3.5V VIN=4V 75 LOAD VIN=7V 20 40 60 80 100 120 140 160 180 200 220 240 Load Current (mA) 4-Cell Input Step-Up/ Step-Down Converter 82µH L1 +VOUT (+3V) 100 VIN=3V 95 1K R3 ILIM/SD VOUT VIN LBI SW LBO SGND CGND AIC1633-3 VOUT Ripple May Be Large at V IN=3V Condition 33K R4 + 22µF C3 24K R5 LOAD Efficiency (%) 1K R2 10µF VIN=6V 80 AIC1633-5 2SB1424 Q1 1K R1 C4 VIN=5V 85 70 0 Fig. 4 +VIN R3 62K + CGND SGND C1 22µF R2 3.3K VOUT ILIM/SD + 150µH L1 + 90 +VOUT (+5V) Efficiency (%) Fig. 3 VIN=4V 90 VIN=5V 85 VIN=7V 80 75 VIN=6V 0 20 40 60 80 100 120 140 160 180 200 220 Load Current (mA) Fig. 5 3-Cell Input 3V Output Step-Down Converter 8 AIC1633 APPLICATION EXAMPLES (CONTINUED) L1 50µH 100µF C1 Q1 9014 IRFZ34 ZD1 5.1V D3 D1 MBR360 D2 10K R2 R1 4.3K Q2 + 100K R3 1N4148 D4 Q3 R4 VOUT (+5V) D5 Q4 9014 + ILIM\SD VOUT C3 10µF VIN LBI SW LBO + 220µF C4 VIN=8V VIN=12V VIN=16V VIN=20V 80 Efficiency (%) 1N4148 0.1µF C2 100 100Ω +VIN 60 40 20 9014 1N4148 SGND CGND 0 AIC1633-5 1N4148 0.005 0.05 0.5 Load Current (mA) 5 Fig. 6 Boost-Driven 5V Output Step-Down Converter +VOUT +VIN 470Ω R1 22µF C2 Fig.7 82µH L1 LOAD + ILIM/SD VOUT 22µF C1 VIN LBI SW LBO GND + 1N5819 D1 R1 FB AIC1631A R2 Adjustable Output Voltage Step-Up Converter 9 AIC1633 PHYSICAL DIMENSION 8 LEAD PLASTIC SO (unit: mm) D SYMBOL MIN MAX A 1.35 1.75 A1 0.10 0.25 B 0.33 0.51 C 0.19 0.25 D 4.80 5.00 E 3.80 4.00 H E e e A C A1 B H 5.80 6.20 L 0.40 1.27 L 8 LEAD PLASTIC DIP (unit: mm) D E1 E A2 A1 C L eB b 1.27(TYP) e SYMBOL MIN MAX A1 0.381 — A2 2.92 4.96 b 0.35 0.56 C 0.20 0.36 D 9.01 10.16 E 7.62 8.26 E1 6.09 7.12 e 2.54 (TYP) eB — 10.92 L 2.92 3.81 10