AIC1630 2-Cell, Step-Up DC/DC Converter Controller FEATURES Adjustable Output Voltage with Two Resistors (AIC1630A). Power-Saving Shutdown Mode (7µA typical). 120KHz Switching Rate. On-Chip Low Battery Detector. DESCRIPTION The AIC1630 is a DC-DC converter designed to drive an external power switch for more flexibility, especially in higher voltage and larger power applications. Typically six components are required to set up a step up configuration easily achieving efficiency beyond 80%. A few more components are required to set up a step down configuration delivering 4A load current with 83% typical efficiency, 86% at 2A load, and 300µA quiescent current. APPLICATIONS Palmtop & Notebook Computers. Battery Charger Supply. Cellular Telephone. LCD Contrast Supply. Flash Memory Programmer. Battery Backup Supplies. Portable Instruments. The output voltage is internally set to 3V, 3.3V, 5V or externally set to an arbitrary value below breakdown voltage of the power switch. Logiccontrolled shutdown mode is provided for power saving. The low battery detector can be also configured as a linear regulator. 120KHz switching rate reduces the inductor size. Inductors of 25µH to 50µH inductance are recommended for most applications. TYPICAL APPLICATION CIRCUIT +VIN 100Ω + 50µH R3 L D1 1N5819 SD VOUT VIN LBI EXT LBO 5nF C2 2SC4672 LOAD 100µF C3 +VOUT 3.3V C1 100µF Q1 1 SGND 270Ω R4 CGND AIC1630 Note : VIN ≥ 1.8V , VOUT ≤ 7V High Efficiency Step-Up DC/DC Converter Analog Integrations Corporation 4F, 9, Industry E. 9th Rd, Science Based Industrial Park, Hsinchu Taiwan, ROC DS-1630-05 TEL: 886-3-5772500 FAX: 886-3-5772510 www.analog.com.tw 1 AIC1630 ORDERING INFORMATION AIC1630 XXX ORDER NUMBER 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 AIC1630CN AIC1630-3CN AIC1630-5CN (PLASTIC DIP ) AIC1630CS AIC1630-3CS AIC1630-5CS (PLASTIC SO) AIC1630ACN (PLASTIC DIP ) AIC1630ACS (PLASTIC SO) PIN CONFIGURATION TOP VIEW SD 1 8 VOUT VIN 2 7 LBI EXT 3 6 LBO 5 CGND SGND 4 TOP VIEW SD 1 8 VOUT VIN 2 7 LBI EXT 3 6 LBO GND 4 5 FB ABSOLUTE MAXIMUM RATINGS Supply Voltage ………………………..…………………………….……………………… 7.0V DC Voltage Applied On All Other Pins ………………………..…………………………. 7.0V Operating Temperature Range ………………………….………………………… -20°C~80°C Storage Temperature Range …………………………….…………………… -65°C ~150°C TEST CIRCUIT Refer to Typical Application Circuit. 2 AIC1630 ELECTRICAL CHARACTERISTICS specified.) PARAMETER Input Voltage Default Output Voltage Switch Off Current Shutdown Mode Current Recovery Time from Shutdown Efficiency Line Regulation Load Regulation Oscillator Frequency LBI Pin Trip Point FB Threshold Voltage EXT Pin Driving Capability LBO “ON Resistance” Input Pin Bias Current Output Pin Leakage (VIN=3.0V, Ta=25°°C, unless otherwise TEST CONDITIONS IL=200mA AIC1630 AIC1630-3 AIC1630-5 MIN. 1.8 TYP. MAX. 7 3.16 2.88 4.80 3.3 3.0 5.0 105 7 0.4 85 3.44 3.12 5.20 140 15 VIN=2.5V, IL=200mA IL=300mA Fig. 1 in Appl. Examples VIN=2.2~3.3V VOUT=5V, IL=100mA IL=10mA~500mA VOUT=5V AIC1630A Pin 8=5V, Pin 3= 0.85V Sourcing Sinking VIN=2V 90 1.17 0.598 UNIT V V µA µA mS % 0.6 %VOUT 2.5 %VOUT 120 1.22 0.617 150 1.27 0.636 KHz V V 10 10 mA mA Ω nA/Pin nA/Pin 80 50 45 3 AIC1630 TYPICAL PERFORMANCE CHARACTERISTICS Ext Pin Sourcing Capability vs Temperature Ext Pin Sourcing Capability 90 85 80 VOUT=5V VOUT=5V 80 Ta=25°C 60 EXT(mA) EXT (mA) 70 50 70 60 Ext Pin Voltage=0.85V 50 40 VOUT=3V 40 30 VOUT=3V 30 20 0.6 0.8 1 1.2 1.4 EXT Pin Voltage (V) 1.6 1.8 10 0 50 60 70 80 55 80 53 Ta=25°C VOUT=5V 51 75 49 EXT(mA) 70 EXT (mA) 40 30 Ext Pin Sinking Capability vs Temperature Ext Pin Sinking Capability 65 60 VOUT=5V 55 VOUT=3V 50 47 Ext Pin Voltage=0.85V 45 43 41 VOUT=3V 39 45 37 40 35 20 Temperature (°C) 85 35 0.6 0.8 1 1.2 1.4 1.6 1.8 2.0 0 10 20 30 Switch off Supply Current vs Input Voltage 110 50 60 70 80 Switch Off Supply Current vs Temperature 120 105 40 Temperature (°C) EXT Pin Voltage (V) 115 VIN=3V 100 110 Ta=25°C 95 S (µA) IS (µA) 105 90 100 85 95 80 75 1.5 2 2.5 3 3.5 VIN (V) 4 4.5 5 90 0 10 20 30 40 50 60 70 80 Temperature (°C) 4 AIC1630 TYPICAL PERFORMANCE CHARACTERISTICS (CONTINUED) Shutdown Mode Supply Current vs Temperature Shutdown Mode Supply Current vs Input Voltage 8.2 9.4 8 VIN=3V 9 Ta=25C 8.6 IS (µA) Is (µA) 7.8 7.6 8.2 7.4 7.8 7.2 7.4 7 1 1.5 2 2.5 3 VIN (V) 3.5 4 4.5 7 5 0 10 20 30 40 50 60 70 80 Temperature (°C) Oscillator Frequency vs Input Voltage Oscillator Frequency vs Temperature 130 123 120 Frequency (KHz) (KHz) 122 110 Ta=25°C Frequency 100 90 80 120 119 118 70 60 VIN=3V 121 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) BLOCK DIAGRAM - SD VOUT Shutdown 100mV + LBI VIN FB EXT=LOW - EXT 1.22V OSC + GND 0.617V FB EXT=HIGH + + - LBO FB 100mV 5 AIC1630 PIN DESCRIPTION AIC1630/ AIC1630-3 / AIC1630-5 PIN 1: SD - The AIC1630 goes in shutdown mode and consumes less than 10µA when SD pin is pulled to ground and it goes in normal operating mode when the SD pin is pulled to a positive voltage above 100mV. PIN 2: VIN - Input supply. PIN 3: EXT - Push-pull drive output to drive external power switch. 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 - - PIN 8:VOUT - The noninverting input of the battery low detector, of which the inverting input is internally connects to 1.22V voltage reference. The output voltage feedbacks to the IC through this pin. AIC1630A PIN 1: SD - The AIC1630A goes in shutdown mode and consumes less than 10 µA when SD pin is pulled to ground and it goes in normal operating mode when the SD pin is pulled to a positive voltage above 100mV. PIN 2: VIN - Input supply. PIN 3: EXT - Push-pull drive output to drive external power switch. 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. 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. 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 6 AIC1630 APPLICATION EXAMPLES VOUT (+5V) 100Ω VIN 95 R3 L 1N5819 VIN LBI LBO SGND 2SC4672 Q1 C3 100µF + VOUT EXT 5nF C2 D1 LOAD SD Eff iciency (% ) 50µH C1 90 100µF + V IN= 4.5V 85 80 V IN= 2.2V V IN= 3.3V V IN= 3V 75 V IN= 2V 70 CGND 270Ω 65 AIC1630-5 R4 60 0 100 200 300 400 500 600 700 800 Load Current (mA) Fig. 1 5V Output Step-Up Converter 100Ω VIN (+12V) 85 VIN=5V R3 + C1 L 180K D2 1N5819 D1 + C3 LBO 80 VIN=3.3V VIN=2.75V 75 1N4148 Note : 10K R2 VIN=2.25V 70 AIC1630A R4 VIN FB GND 1K 2SC4672 Q1 LOAD EXT R1 LBI VIN 47µH VIN=4.5V VOUT SD 220µF Efficiency (%) VOUT 100µF OS-CON 0 30 60 90 120 150 180 210 240 270 Load Current (mA) ≥ 2.2V Fig. 2 12V Output Step-Up Converter for Flash Memory VS(+3/5V) VOUT 95 (+36V) V IN= 20V C1 L 47µF 220µH EXT D1 + C3 33µF 120Ω R3 1M LBO GND AIC1630A 90 R1 LBI VIN 1N5819 LOAD VOUT SD V IN= 16V Ef ficiency (% ) + VIN 2SC4672 Q1 FB 85 V IN= 12V 80 V IN= 8V V IN= 6V 75 17.8K R2 Vs= 5V V IN= 5V 70 0 10 20 30 40 50 60 70 Load Current (mA) Fig. 3 36V Output Step-Up Converter for Color LCD 7 AIC1630 APPLICATION EXAMPLES 10µF C4 C1 + C2 47µF 0.1µF 1N5819 D2 LOAD + 2SC4672 Q1 VOUT (-24V) C3 + 47µF 88 C6 5nF 150µH D3 1.2K R3 SD VOUT VIN LBI EXT LBO GND FB AIC1630A C5 5nF 90K 2.4K V IN= 15V 86 V IN= 10V 84 R1 Eff iciency (% ) L D1 1N5819 (CONTINUED) VS (+3/5V) VIN 1N5819 V IN= 20V 82 V IN= 5V 80 78 76 74 R2 Vs= 5V 72 70 0 5 10 15 20 25 30 35 40 45 Load Current (mA) Fig. 4 + C3 D1 1N5819 10µF C2 D2 2SC4672 Q1 10µF + 5nF 78 220µF L 150Ω R4 R3 C4 + 33µF VIN LBI EXT LBO 90K R1 74 V IN= 4V 72 V IN= 3V 70 68 66 64 FB GND AIC1630A D4 1N5819 D3 C1 120Ω 1N5819 LOAD VOUT SD V IN= 5V Vs= 3V 76 + Ef ficiency (% ) 150µH VOUT (-24V) C5 -24V Output Inverting Converter for LCD VS (+3/5V) VIN 2.4K 62 R2 V IN= 2V 60 58 1N4148 56 0 5 10 15 20 25 Load Current (mA) VOUT (+12V) 2V Input 20mA Load -24V Output Inverting Converter for LCD VIN + C3 L 47µF C2 D2 C4 47µF + 10µF C5 + 95 V IN= 20V C1 10µF SD 2SC4672 Q1 + VS (+3/5V) + 50µH D1 1N5819 VOUT (-12V) 220µF 120Ω R4 Fig. 6 VIN LBI EXT LBO 180K R1 430Ω R3 1N5819 D3 VOUT GND FB AIC1630A D4 1N4148 10K R2 90 Eff iciency (% ) Fig. 5 1N5819 V IN= 16V 85 V IN= 12V 80 V IN= 8V V IN= 6V 75 Vs= 5V V IN= 5V 70 0 10 20 30 40 Load Current (mA) 50 60 70 12V Dual Output Converter for computer for computer Interfacing 8 AIC1630 APPLICATION EXAMPLES (CONTINUED) L SI9430DY V IN R3 100K + 100µF C1 5.1V ZD1 R4 270Ω 9014 Q1 + 50µH MBR360 Q2 D1 C2 220µF V OUT (+5V) 91 89 87 VIN= 12V 10µF C3 SD VIN MPSA13 85 VOUT R1 45K LBI C4 680P EXT R5 LBO GND R2 6.4K FB 36K AIC1630A Quicient Current = 300µA 100µF C1 81 VIN= 16V VIN= 20V 79 77 75 0 1 1.5 2 2.2 2.5 3 3.5 4 L 270Ω R4 Q3 1N4148 MBR360 Q1 5.1V 9014 ZD1 Q2 9014 R3 100K VIN= 8V 83 5V Output Step-Down Converter -1 SI9430DY + L O A D Load Current (A) Fig. 7 VIN Efficiency (% ) + 50µH D1 VOUT (+5V) + 220µF C2 90 V IN= 8V + 10µF C3 SD VOUT VIN 680P R5 C4 LBI EXT LBO GND FB 36K AIC1630A Quicient Current = 300µA Fig. 8 R1 45K L O A D Ef ficiency (% ) D2 MPSA13 V IN= 12V 85 R2 6.4K V IN= 16V V IN= 20V 80 0 1 2 3 Load Current (A) 4 5 5V Output Step-Down Converter -2 9 AIC1630 BATTERY PACK IRFD020 Q1 VIN LBI EXT LBO GND FB D3 AIC1630A + R3 + C2 RIF 3 3K + R9 0.8 2 MODE LED AIC1761/1766 1N4148 D3 GND FB AIC1630A Q2 12K 2N3904 R2 750 R5 R6 330 2N2222 Q5 2N3904 Q4 RIT 75K RIF 0.82 100K R10 + 100µF C4 120K 22K R9 +VIN (+VIN can be either higher or lower than the battery voltage) 220 R12 R11 + + C3 4.7µF 120K R15 0.1µF C5 1.5K R13 VBT VREF GND VDD TIMER VOUT MODE LED 1.5K R14 Trickle LBO C2 VBAT 47K R3 240K R4 220µF LBI EXT BATTERY PACK Charging 100µF VIN Note: VOUT 100K TIP32C Q3 VOUT 4.7V ZD1 L1 50µH IRFD020 Q1 C1 VDD TIMER 1.5K R13 Step-Up Rechargeable Battery Charger IN5819 D2 + GND 1.5K R12 VIN ≥ 2.2V Charging current =0.8A, Auto-Cut-Off at 0.75/0.25% -∆V point and Fault Conditions. (RIF sets the Charging Current) VIN must be lower than VBAT. Short Circuit Condition is protected with a 2A Fuse. Fig. 9 SD + 22 K C3 R7 R6 150 R1 VREF VBT C3 1 0nF Note: 0.1µF C5 100µF C4 R11 1 20K 1 2K R2 R5 100µF C1 100k 33K VBAT VOUT SD ZD1 4.7V R4 220µF R1 240K D2 1 50 +VIN (VIN<VBAT) 220 R10 Trickle 1N5819 Charging 50µH L1 2A FUSE (CONTINUED) 4.7µF APPLICATION EXAMPLES 1n4148 AIC1761/1766 Fast Charge Current = 0.8A @VIN<VBAT =(VIN - VBAT - 0.5)/0.82 @VIN>VBAT Trickle charge Current = 30mA. (RIF sets Fast Charge Current, RIT sets Trickle Charge Current) Typical Efficiency = 75%. With Short Circuit Protection. Fig. 10 Step-Up/Down Rechargeable Battery Charger 10 AIC1630 PHYSICAL DIMENSIONS 8 LEAD PLASTIC SO (unit: mm) D H E e 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 e A A1 C B SYMBOL 1.27(TYP) H 5.80 6.20 L 0.40 1.27 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 L 8 LEAD PLASTIC DIP (unit: mm) D E1 E A2 A1 C L eB b e e 2.54 (TYP) eB — 10.92 L 2.92 3.81 11