AIC1630CS

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. 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. APPLICATIONS Palmtop & Notebook Computers. Battery Charger Supply. Cellular Telephone. LCD Contrast Supply. Flash Memory Programmer. Battery Backup Supplies. Portable Instruments. TYPICAL APPLICATION CIRCUIT +VIN 100Ω 100µF R3 L D1 1N5819 2SC4672 50µH C1 + SD VIN EXT 100µF C3 LOAD Q1 1 SGND 270Ω R4 VOUT LBI LBO CGND +VOUT 3.3V 5nF C2 AIC1630 Note : VIN ≥ 1.8V , VOUT ≤ 7V High Efficiency Step-Up DC/DC Converter Analog Integrations Corporation DS-1630-05 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 AIC1630 ORDERING INFORMATION AIC1630 XXX 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 ORDER NUMBER 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 VIN 2 EXT 3 SGND 4 8 7 6 5 VOUT LBI LBO CGND TOP VIEW SD 1 VIN 2 EXT 3 GND 4 8 7 6 5 VOUT LBI LBO 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 (VIN=3.0V, Ta=25°C, unless otherwise MIN. 1.8 TYP. M AX. 7 UNIT V TEST CONDITIONS IL=200mA AIC1630 AIC1630-3 AIC1630-5 3.16 2.88 4.80 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 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 90 1.17 0.598 3.3 3.0 5.0 105 7 0.4 85 0.6 2.5 120 1.22 0.617 80 50 45 3.44 3.12 5.20 140 15 V µA µA mS % %VOUT %VOUT 150 1.27 0.636 KHz V V mA mA Ω nA/Pin nA/Pin LBO “ON Resistance” Input Pin Bias Current Output Pin Leakage AIC1630A Pin 8=5V, Pin 3= 0.85V Sourcing Sinking VIN=2V 10 10 3 AIC1630 TYPICAL PERFORMANCE CHARACTERISTICS Ext Pin Sourcing Capability 85 80 70 Ext Pin Sourcing Capability vs Temperature 90 VOUT=5V 80 70 60 50 VOUT=5V EXT (mA) 60 EXT(mA) Ta=25°C 50 Ext Pin Voltage=0.85V 40 VOUT=3V 30 40 VOUT=3V 30 0.6 0.8 1 20 EXT Pin Voltage (V) 1.2 1.4 1.6 1.8 0 10 20 30 40 50 60 70 80 Temperature (°C) Ext Pin Sinking Capability 85 80 75 70 55 Ext Pin Sinking Capability vs Temperature 53 51 49 Ta=25°C VOUT=5V Ext Pin Voltage=0.85V EXT (mA) 65 60 55 50 45 40 35 0.6 0.8 1 1.2 1.4 1.6 1.8 2.0 EXT(mA) 47 45 43 41 39 37 35 0 10 20 30 40 50 60 70 80 VOUT=5V VOUT=3V VOUT=3V EXT Pin Voltage (V) Temperature (°C) Switch off Supply Current vs Input Voltage 110 105 100 120 115 110 Switch Off Supply Current vs Temperature VIN=3V IS (µA) 90 85 80 75 1.5 2 2.5 3 3.5 4 4.5 5 S (µA) 95 Ta=25°C 105 100 95 90 VIN (V) 0 10 20 30 40 50 60 70 80 Temperature (°C) 4 AIC1630 TYPICAL PERFORMANCE CHARACTERISTICS (CONTINUED) Shutdown Mode Supply Current vs Input Voltage 8.2 8 9.4 9 Shutdown Mode Supply Current vs Temperature VIN=3V Ta=25C 7.8 8.6 Is (µA) 7.6 7.4 7.2 7 IS (µA) 8.2 7.8 7.4 7 1 1.5 2 2.5 VIN (V) 3 3.5 4 4.5 5 0 10 20 30 40 50 60 70 80 Temperature (°C) Oscillator Frequency vs Input Voltage 130 120 123 Oscillator Frequency vs Temperature (KHz) 122 110 100 Frequency (KHz) VIN=3V 121 Ta=25°C Frequency 90 80 70 60 120 119 118 1 1.5 2 2.5 VIN (V) 3 3.5 4 4.5 5 117 0 10 20 30 40 50 60 70 80 Temperature (°C) BLOCK DIAGRAM SD 100mV VIN FB EXT=LOW EXT OSC + 0.617V FB EXT=HIGH 1.22V + LBO Shutdown + LBI VOUT GND + 100mV FB 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. Input supply. Push-pull drive output to drive external power switch. Ground connected to source of power switch. Ground for control circuits of the IC. It should be separated from SGND to avoid the interference. 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. 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. - Input supply. PIN 2: VIN PIN 3: EXT - PIN 2: VIN 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: PIN 4:SGND PIN 5:CGND - PIN 6:LBO - 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 7:LBI - PIN 8:VOUT - 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) VIN 100Ω R3 100µF 95 90 + C1 50µH L 1N5819 SD VIN EXT SGND VOUT LBI LBO CGND 65 60 Ef f icienc y (% ) 85 80 V IN= 4.5V V IN= 3V V IN= 3.3V V IN= 2.2V 75 70 5nF C2 D1 100µF LOAD 2SC4672 Q1 V IN= 2V + C3 270Ω R4 AIC1630-5 0 100 200 300 400 500 600 700 800 Load Current (mA ) Fig. 1 5V Output Step-Up Converter VOUT (+12V) 100Ω 85 VIN R3 C1 VIN=5V + SD 220µF VIN VOUT VIN=4.5V Efficiency (%) 180K LBI LBO FB R1 80 L 1N5819 D1 VIN=3.3V VIN=2.75V 47µH D2 1N4148 EXT 1K R4 GND 75 2SC4672 Q1 LOAD 100µF OS-CON + C3 10K R2 70 0 30 60 90 VIN=2.25V 120 150 180 210 240 270 AIC1630A Load Current (mA) Note : VIN ≥ 2.2V Fig. 2 12V Output Step-Up Converter for Flash Memory VOUT (+36V) VIN VS(+3/5V) 95 V IN= 20V + C1 L 220µH 47µF SD VIN EXT VOUT LBI LBO FB 1M R1 90 V IN= 16V Ef ficiency (% ) 85 V IN= 12V V IN= 8V V IN= 6V 1N5819 D1 LOAD 2SC4672 Q1 + C3 33µF 120Ω R3 80 GND 75 AIC1630A 17.8K R2 70 0 10 V IN= 5V 20 30 40 50 Vs= 5V 60 70 Load Current (mA) Fig. 3 36V Output Step-Up Converter for Color LCD 7 AIC1630 APPLICATION EXAMPLES VIN D1 1N5819 VOUT (-24V) C3 L 150µH 10µF + 0.1µF C2 47µF 2SC4672 Q1 VS (+3/5V) C6 5nF (CONTINUED) 88 86 84 V IN= 15V V IN= 10V V IN= 20V V IN= 5V + Eff iciency (% ) C1 SD VIN EXT VOUT LBI LBO FB 90K R1 82 80 78 76 74 72 70 0 5 10 15 20 25 30 1.2K R3 C5 5nF GND C4 + 47µF 1N5819 LOAD 1N5819 D2 D3 AIC1630A 2.4K R2 Vs= 5V 35 40 45 Load Current (mA) Fig. 4 -24V Output Inverting Converter for LCD VIN D1 1N5819 VOUT (-24V) C5 150µH L VS (+3/5V) + 220µF C3 10µF 2SC4672 Q1 78 76 Vs= 3V V IN= 5V V IN= 4V V IN= 3V + C1 150Ω SD VIN EXT R3 D4 GND VOUT LBI LBO FB 74 5nF D2 + 10µF C2 120Ω R4 1N5819 LOAD 1N5819 D3 C4 + 33µF AIC1630A 2.4K R2 Ef ficiency (% ) 90K R1 72 70 68 66 64 62 60 58 V IN= 2V 1N4148 56 0 5 10 15 20 25 Load Current (mA) Fig. 5 2V Input 20mA Load -24V Output Inverting Converter for LCD VOUT (+12V) VIN C3 L D1 1N5819 50µH + 220µF VS (+3/5V) + 10µF C1 SD VOUT LBI LBO FB 10K R2 180K R1 90 95 V IN= 20V 47µF C2 D2 2SC4672 Q1 VOUT (-12V) + 10µF C5 + VIN 120Ω R4 430Ω R3 EXT GND Eff iciency (% ) V IN= 16V V IN= 12V V IN= 8V V IN= 6V 85 80 1N5819 C4 47µF + 1N5819 D3 D4 1N4148 AIC1630A 75 V IN= 5V 70 0 10 20 30 40 50 Vs= 5V 60 70 Load Current (mA) Fig. 6 12V Dual Output Converter for computer for computer Interfacing 8 AIC1630 APPLICATION EXAMPLES SI9430DY MBR360 Q2 V IN + 100 µF C1 5.1V ZD1 R3 100K 9014 Q1 R4 270 Ω (CONTINUED) L 50µH + C2 220µF V OUT (+5V) 91 89 87 D1 + SD VIN MPSA13 680P R5 36K Quicient Current = 300 µA C4 EXT GND LBO FB R2 6.4K VOUT LBI VIN= 12V VIN= 8V R1 45K L O A D Efficiency (% ) 10µF C3 85 83 81 79 77 75 0 VIN= 16V VIN= 20V AIC1630A 1 1.5 2 2.2 2.5 3 3.5 4 Load Current (A ) Fig. 7 5V Output Step-Down Converter -1 SI9430DY MBR360 VIN L 50µH D1 220µF + R3 100K Q1 5.1V 9014 ZD1 100µF C1 Q3 9014 270Ω R4 1N4148 D2 Q2 + C2 VOUT (+5V) 90 V IN= 8V 10µF 680P R5 36K Quicient Current = 300µA C4 C3 SD VIN VOUT LBI LBO FB R2 6.4K R1 45K L O A D Ef ficiency (% ) + V IN= 12V 85 MPSA13 EXT GND V IN= 16V V IN= 20V 80 0 AIC1630A 1 Load Current (A) 2 3 4 5 Fig. 8 5V Output Step-Down Converter -2 9 AIC1630 APPLICATION EXAMPLES 2A FUSE 50µH L1 1N5819 D2 240K 100k VBAT R4 33K 220µF 1 50 R1 SD VOUT LBI LBO FB VIN EXT GND (CONTINUED) +VIN (VIN