AIC1612 High Efficiency Selectable Current Limit Synchronous Step-Up DC/DC Converter DESCRIPTION FEATURES High Efficiency (93% VOUT=3.3V, IOUT=200mA) when VIN=2.4V, AIC1612 is a high efficiency step-up DC-DC converter. The start-up voltage is as low as Output Current up to 500mA. (VIN=2.4V, at VOUT=3.3V, CLSEL=OUT) 0.8V with operating voltage down to 0.7V. 20A Quiescent Supply Current. these devices offer a built-in synchronous rec- Simply consuming 20A of quiescent current, Power-Saving Shutdown Mode (0.1A typical). Internal Synchronous Rectifier (No External Diode Required). Selectable Current Limit for Reduced Ripple Low Noise , Anti-Ringing Feature. On-Chip Low Battery Detector. Low Battery Hysteresis Space-Saving Package: MSOP-10 tifier that reduces size and cost by eliminating the need for an external Schottky diode and improves overall efficiency by minimizing losses. The switching frequency can range up to 500KHz depending on the load and input voltage. The output voltage can be easily set by two external resistors from 1.8V to 5.5V, con- APPLICATIONS necting FB to OUT to get 3.3V, or connecting Palmtop & Notebook Computers. PDAs Wireless Phones Pocket Organizers. Digital Cameras. Hand-Held Devices with 1 to NiMH/NiCd Batteries. to GND to get 5.0V. In terms of design flexibility, the peak current of internal switch is selectable (0.65A or 1.0A). AIC1612 also features a circuit that eliminates noise due to in3-Cell ductor ringing. of TYPICAL APPLICATION CIRCUIT VIN + 47F 200 22H BATT ON OFF SHDN Selectable Current Limit (1.0A or 0.65A) LX OUT CLSEL LBI Low Battery Detection REF AIC1612 LBO GND FB Output 3.3V, 5.0V or Adj. (1.8V to + 5.5V) up to 300mA 47F Low-battery Detect Out 0.1F Analog Integrations Corporation 4F, 9 Industry E. 9th Rd, Science-Based Industrial Park, Hsinchu, Taiwan TEL: 886-3-5772500 FAX: 886-3-5772510 www.analog.com.tw DS-1612-01 080703 1 AIC1612 ORDERING INFORMATION AIC1612CXXX PIN CONFIGURATION PACKING TYPE TR: TAPE & REEL PACKAGING TYPE O: MSOP10 Example: AIC1612COTR In MSO10 Package & Taping & Reel Packing Type (MSOP10) FB 1 LBI 2 LBO 3 TOP VIEW 10 OUT 9 LX 8 GND CLSEL 4 7 BATT REF 5 6 SHDN ABSOLUTE MAXIMUM RATINGS Supply Voltage (OUT to GND) Switch Voltage (LX to GND) 8.0V VOUT+ 0.3V Battery Voltage (BATT to GND) 6.0V SHDN , LBO to GND 6.0V LBI, REF, FB, CLSEL to GND VOUT+0.3V Switch Current (LX) -1.5A to +1.5A Output Current (OUT) -1.5A to +1.5A Operating Temperature Range -40C ~ +85C Storage Temperature Range -65C ~150C TEST CIRCUIT Refer to Typical Application Circuit. 2 AIC1612 ELECTRICAL CHARACTERISTICS (VIN=2.0V, VOUT=3.3V (FB=VOUT), RL=, TA=25C, unless otherwise specified.) PARAMETER TEST CONDITIONS MIN. Minimum Input Voltage 1.1 RL=3K (Note1) 0.8 Start-Up Voltage Tempco VIN<VOUT 1.8 Output Voltage FB = VOUT 3.17 3.3 CLSEL=OUT 300 350 =3.3V) CLSEL=GND 150 300 CLSEL=OUT 180 230 =5.0V) CLSEL=GND 90 160 1.199 1.23 FB=OUT Steady State Output Current (VOUT (Note 2) FB=GND (VOUT IREF= 0 Reference Voltage Tempco UNIT V 5.5 V 1.1 V -2 Output Voltage Range Reference Voltage MAX. 0.7 Operating Voltage Start-Up Voltage TYP. mV/C 5.5 3.43 V mA 1.261 0.024 V mV/C Reference Load Regulation IREF = 0 to 100A 10 30 mV Reference Line Regulation VOUT = 1.8V to 5.5V 5 10 mV/V 1.23 1.261 V 0.3 0.6 FB , LBI Input Threshold 1.199 Internal switch On-Resistance ILX = 100mA LX Switch Current Limit LX Leakage Current CLSEL=OUT 0.80 1.0 1.25 CLSEL=GND 0.50 0.65 0.85 0.05 1 A VFB = 1.4V , VOUT = 3.3V 20 35 A SHDN = GND 0.1 1 A VOUT= 3.3V ,ILOAD = 200mA 90 VOUT = 2V ,ILOAD = 1mA 85 VLX=0V~4V; VOUT=4V Operating Current into OUT (Note 3) Shutdown Current into OUT Efficiency A % 3 AIC1612 ELECTRICAL CHARACTERISTICS PARAMETER (Continued) TEST CONDITIONS MIN. TYP. MAX. UNIT LX Switch On-Time VFB =1V , VOUT = 3.3V 2 4 7 S LX Switch Off-Time VFB =1V , VOUT = 3.3V 0.6 0.9 1.4 S FB Input Current VFB = 1.4V 0.03 50 nA LBI Input Current VLBI = 1.4V 1 50 nA CLSEL Input Current CLSEL = OUT 1.4 3 A SHDN Input Current V SHDN = 0 or VOUT 0.07 50 nA LBO Low Output Voltage VLBI = 0, ISINK = 1mA 0.2 0.4 A LBO Off Leakage Current V LBO = 5.5V, VLBI = 5.5V 0.07 1 LBI Hystereisis Damping Switch Resistance SHDN Input Voltage CLSEL Input Voltage 50 VBATT = 2V 50 VIL VIH 100 0.2VOUT 0.8VOUT VIL VIH mV 0.2VOUT 0.8VOUT V V Note 1: Start-up voltage operation is guaranteed without the addition of an external Schottky diode between the input and output. Note 2: Steady-state output current indicates that the device maintains output voltage regulation under load. Note 3: Device is bootstrapped (power to the IC comes from OUT). This correlates directly with the actual battery supply. 4 AIC1612 TYPICAL PERFORMANCE CHARACTERISTICS 0.5 Shutdown Current Current (A) Input Battery Current (A) 160 140 120 100 VOUT=5V (FB=GND) 80 60 40 VOUT=3.3V (FB=OUT) 20 0 0.5 1.0 1.5 2.0 2.5 3.0 Input battery voltage (V) No-Load Battery Current vs. Input Battery 3.5 0.2 0.1 1.6 VOUT=5V (FB=GND) 1.2 1.0 0.8 0.6 VOUT=3.3V (FB=OUT) 0.4 0.2 0.0 0.01 0.1 1 10 100 Output Current (mA) Fig. 3 300 5.5 VOUT=5.0V (FB=GND) 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 Input Voltage (V) Fig. 4 Ripple Voltage (mV) VIN=1.2V 60 VIN=2.4V VIN=3.6V 30 20 VOUT=5V (FB=GND) 10 CLSEL=OUT (ILIMIT =1A) 100 Turning Point between CCM & DCM CLSEL=OUT (ILIMIT =1A) 160 140 VIN=3.6V 120 100 80 VOUT=5.0V L=22H CIN=47F COUT=47F VIN=2.4V 60 40 VIN=1.2V 20 1000 0 0 50 100 Output Current (mA) Fig. 5 5.0 50 180 10 4.5 Shutdown Current vs. Supply Voltage 100 80 1 4.0 150 200 0.1 3.5 VOUT=3.3V (FB=OUT) 200 220 0 0.01 3.0 250 90 40 2.5 L=22H CIN=100F COUT=100F 350 Start-Up Voltage vs. Output Current 50 2.0 400 100 70 1.5 Fig. 2 1.8 1.4 1.0 Supply Voltage (V) CCM/DCM Boundary Output Current (mA) Fig. 1 Start-Up Voltage (V) 0.3 0.0 0.0 Efficiency (%) 0.4 Efficiency vs. Output Current (ref. to Fig.35) 150 200 250 300 350 400 450 500 550 600 650 Output Current (mA) Fig. 6 Ripple Voltage (ref. to Fig.35) 5 AIC1612 TYPICAL PERFORMANCE CHARACTERISTICS 100 240 CLSEL=OUT (ILIMIT =1A) 90 VIN=3.6V 80 VIN=3.6V 160 Efficiency (%) Ripple Voltage (mV) 200 VIN=2.4V 120 VOUT=5.0V L=22H CIN=100F COUT=100F 80 40 VIN=1.2V 0 100 200 300 400 500 600 700 70 VIN=2.4V 60 40 VOUT=5V (FB=GND) 20 CLSEL=GND (ILIMIT =0.65A) 10 0 800 0.01 0.1 1 Output Current (mA) Fig. 7 VIN=1.2V 50 30 0 10 100 1000 Output Current (mA) Ripple Voltage (ref. to Fig.35) Fig. 8 160 Efficiency vs. Output Current (ref. to Fig.35) 120 CLSEL=GND (ILIMIT =0.65A) 140 CLSEL=GND (ILIMIT =0.65A) VIN=3.6V 120 100 80 VIN=2.4V 60 VOUT=5.0V L=22H CIN=47F COUT=47F 40 VIN=1.2V 20 80 60 0 50 100 150 200 250 300 350 400 450 500 550 VIN=1.2V 0 100 200 Output Current (mA) Fig. 9 VOUT=5.0V L=22H CIN=100F COUT=100F VIN=2.4V 40 20 0 0 VIN=3.6V 100 Ripple Voltage (mV) Ripple Voltage (mV) (Continued) 300 400 500 600 Output Current (mA) Ripple Voltage (ref. to Fig.35) Fig. 10 100 260 90 240 Ripple Voltage (ref. to Fig.35) CLSEL=OUT (ILIMIT =1A) 220 VIN=1.2V 70 60 Ripple Voltage (mV) (V) Efficiency (%) 80 VIN=2.4V 50 40 30 VOUT=3.3V (FB=OUT) 20 CLSEL=OUT (ILIMIT =1A) 10 0 0.01 200 180 160 140 VIN=2.4V 120 100 60 VIN=1.2V 40 20 0 0.1 1 10 100 1000 0 50 100 Output Current (mA) Fig. 11 VOUT=3.3V L=22H CIN=47F COUT=47F 80 Efficiency vs. Output Current (ref. to Fig.34) 150 200 250 300 350 400 450 500 550 600 Output Current (mA) Fig. 12 Ripple Voltage (ref. to Fig.34) 6 AIC1612 TYPICAL PERFORMANCE CHARACTERISTICS (Continued) 100 CLSEL=OUT (ILIMIT =1A) 140 90 80 Efficiency (%) Ripple Voltage (mV) 120 100 VIN=2.4V VIN=1.2V 80 60 40 20 AIC1610 (ILIMIT =1A) 0 0 50 100 150 200 250 300 350 VIN=1.2V 70 50 40 VOUT=3.3V 30 VOUT=3.3V (FB=OUT) CIN=100F COUT=100F 20 CLSEL=GND (ILIMIT =0.65A) 400 450 10 500 0 0.01 550 1 Output Current (mA) Fig. 13 Ripple Voltage (ref. to Fig.34) Fig. 14 100 1000 Efficiency vs. Output Current (ref. to Fig.34) 120 CLSEL=GND (ILIMIT =0.65A) CLSEL=GND (ILIMIT =0.65A) 110 120 100 Ripple Voltage (mV) Ripple Voltage (mV) 10 Output Current (mA) 140 100 80 VIN=2.4V 60 VOUT=3.3V L=22H CIN=47F COUT=47F 40 VIN=1.2V 20 90 80 70 60 VIN=2.4V 50 VOUT=3.3V L=22H CIN=100F COUT=100F 40 30 20 VIN=1.2V 10 0 0 0 50 100 150 200 250 300 350 400 450 500 0 50 100 150 Output Current (mA) Fig. 15 200 250 300 350 400 450 500 Output Current (mA) Ripple Voltage (ref. to Fig.34) Fig. 16 1.26 Ripple Voltage (ref. to Fig.34) 0.50 0.45 1.25 P-Channel 0.40 Resistance () Reference Voltage (V) VIN=2.4V 60 1.24 1.23 1.22 0.35 0.30 N-Channel 0.25 0.20 0.15 VOUT=3.3V ILX=100mA 0.10 1.21 IREF=0 1.20 -40 -20 0 20 40 60 80 0.05 0.00 -60 -40 Fig. 17 Reference Voltage vs. Temperature -20 0 20 40 60 80 100 Temperature (C) Temperature (C) Fig. 18 Switch Resistance vs. Temperature 7 AIC1612 TYPICAL PERFORMANCE CHARACTERISTICS 900 700 Maximum Output Current (mA) Maximum Output Current (mA) 800 VOUT=3.3V (FB=OUT) 600 CLSEL=OUT (ILIMIT=1A) 500 400 300 200 CLSEL=GND (ILIMIT=0.65A) 100 0 1.0 1.2 Fig. 19 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 Input Voltage (V) Maximum Output Current vs. Input Voltage VOUT=5V (FB=GND) 700 600 CLSEL=OUT (ILIMIT=1A) 500 400 300 200 CLSEL=GND (ILIMIT=0.65A) 100 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 Input Voltage (V) Maximum Output Current vs. Input Voltage Fig. 20 160 Switching Frequency fosc (KHz) CLSEL=OUT (ILIMIT=1A) 1.0 0.8 ILIM (A) 800 0 3.0 1.2 0.6 CLSEL=GND (ILIMIT=0.65A) 0.4 0.2 0.0 2.0 2.5 Fig. 21 3.0 200 VIN=1.2V VOUT=3.3V 180 160 3.5 4.0 4.5 5.0 Output Voltage (V) Inductor Current vs. Output Voltage 220 Switching Frequency Fosc (KHz) (Continued) 140 120 VOUT=5.0V 100 80 VOUT=3.3V 60 40 IOUT=100mA 20 0 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 Supply Voltage (V) Fig. 22 VIN=2.4V VOUT=3.3V Switching Frequency vs. Supply Voltage W /o Damping Ringing V IN =2.4V V OUT =3.3V 140 120 VIN=2.4V VOUT=5V 100 80 60 40 VIN=3.6V VOUT=5V 20 0 1 10 100 1000 Output Current (mA) Fig. 23 Switching Frequency vs. Output Current Fig. 24 W ithout Damping Ringing Function 8 AIC1612 TYPICAL PERFORMANCE CHARACTERISTICS (Continued) LX Pin W aveform W . Dam ping Ringing V IN =2.4V V IN =2.4V V O U T =3.3V V OUT =3.3V Loading=200m A Inductor C urrent V O UT A C C ouple Fig. 25 W ith Dam ping Ringing Function Loading: 1m A F ig. 26 H eavy Load W aveform 200m A VIN V IN =2.4V V O U T =3.3V VIN=2.0V~3.0V VOUT=3.3V, IOUT=100mA V O U T : A C C ouple VOUT F ig. 27 Load Transient R esponse V SHDN Fig. 28 Line Transient Response V SHDN VOUT VOUT VOUT=3.3V VOUT=3.3V CIN=COUT=100F C IN=COUT=47F Fig. 29 Exiting Shutdown Fig. 30 Exiting Shutdown 9 AIC1612 TYPICAL PERFORMANCE CHARACTERISTICS V SHDN V SHDN VOUT Fig. 31 (Continued) V OUT VOUT=5.0V V OUT =5.0V CIN=COUT=47F C IN =C OUT =100F Fig. 32 Exiting Shutdown Exiting Shutdown BLOCK DIAGRAM OUT SHDN CLSEL OUT + Minimum Off-Time 0.1F Damping Q1 Switch One Shot Q3 BATT R1 200 VIN L LX Q2 47H F/ F S Q C3 47F + C1 47F GND R - One Shot + Mirror Maximum On-Time FB + LBO + - Reference Voltage REF C4 0.1F LBI 10 AIC1612 PIN DESCRIPTIONS PIN 1: FB- Connecting to OUT to get +3.3V output, connecting to GND to get +5.0V output, or using a resistor network to set output voltage ranging from +1.8V to +5.5V. PIN 2: LBILow-Battery comparator input internally sets at +1.23V to trip. PIN 3: LBO- Open-drain low battery comparator output. Output is low when VLBI is <1.23V. LBO is high impedance during shutdown. PIN 4: CLSEL- Current-limit selects input. CLSEL= OUT sets the current limit to 1.0A. CLSEL=GND sets the current limit to 0.65A. PIN 5: REF- 1.23V reference voltage. Bypass with a 0.1F capacitor. PIN 6: SHDN- Shutdown input. High=operating, low=shutdown. PIN 7: BATT- Battery input and damping switch connection. If damping switch is unused, leave BATT unconnected. PIN 8: GND- Ground. PIN 9: LXN-channel and P-channel power MOSFET drain. PIN 10: OUT- Power output. OUT provides bootstrap power to the IC. APPLICATION INFORMATION Overview BLOCK DIAGRAM) with ultra-low quiescent current. AIC1612 is a high efficiency, step-up DC-DC con- The peak current of the internal N-MOSFET power verter, designed to feature a built-in synchronous rectifier, which reduces size and cost by eliminating the need for an external Schottky diode. The start-up voltage of AIC1612 is as low as 0.8V and it operates with an input voltage down to 0.7V. Quiescent supply current is only 20A. In addition, AIC1612 features a circuit that eliminates inductor ringing to reduce switch is selectable. The switch frequency depends on either loading condition or input voltage, and can range up to 500KHz. It is governed by a pair of oneshots that set a minimum off-time (1S) and a maximum on-time (4S). Synchronous Rectification noise. The internal P-MOSFET on-resistance is typi- Using the internal synchronous rectifier eliminates cally 0.3 to improve overall efficiency by minimizing the need for an external Schottky diode. Therefore, AC losses. The output voltage can be easily set by the cost and board space are reduced. During the two external resistors from 1.8V to 5.5V, connecting cycle of off-time, P-MOSFET turns on and shuts N- FB to OUT to get 3.3V, or connecting to GND to get MOSFET 5.0V. CLSEL pin of AIC1612 offers a selectable cur- resistance of MOSFET, synchronous rectifier signifi- rent limit (1.0A or 0.65A). The lower current limit al- cantly improves efficiency without an additional ex- lows the use of a physically smaller inductor in ternal Schottky diode. Thus, the conversion effi- space-sensitive applications. ciency can be as high as 93%. PFM Control Scheme Reference Voltage The key feature of AIC1612 is a unique minimum- The reference voltage (REF) is nominally 1.23V for off-time, constant-on-time, current-limited, pulse- excellent T.C. performance. In addition, REF pin can frequency-modulation (PFM) control scheme (see source up to 100A to external circuit with good load off. Due to the low turn-on 11 AIC1612 regulation (<10mV). A bypass capacitor of 0.1F is required for proper operation and good performance Low-Battery Detection AIC1612 contains an on-chip comparator with 50mV internal hysteresis (REF, REF+50mV) for low battery Shutdown detection. If the voltage at LBI falls below the internal The whole circuit is shutdown when V SHDN is low. At reference voltage, LBO (an open-drain output) sinks shutdown mode, the current can flow from battery to current to GND. output due to the body diode of P-MOSFET. VOUT falls to approximately Vin-0.6V and LX remains high impedance. The capacitance and load at OUT de- Component Selection termine the rate at which VOUT decays. Shutdown 1. Inductor Selection can be pulled as high as 6V, regardless of the volt- An inductor value of 22H performs well in most age at OUT. applications. The AIC1612 also works with inductors in the 10H to 47H range. An inductor Current Limit Select Pin with higher peak inductor current tends a higher AIC1612 allows a selectable inductor current limit of output voltage ripple (IPEAKxoutput filter capaci- either 1.0A or 0.65A. The flexibility contributes to de- tor ESR). The inductor's DC resistance signifi- signs for higher current or smaller applications. cantly affects efficiency. We can calculate the CLSEL draws 1.4A when connecting to OUT. AIC1612 is designed with an internal damping switch maximum output current as follows: VIN VOUT - VIN IOUT(MAX ) = ILIM - t OFF VOUT 2xL ........................................................................(2) (Fig.33) to reduce ringing at LX. where IOUT(MAX)=maximum output current in BATT/Damping Switch The damping switch supplies a path to quickly dissipate the energy stored in inductor and reduces the ringing at LX. Damping LX ringing does not reduce VOUT ripple, but does reduce EMI. R1=200 works well for most applications while reducing efficiency by only 1%. Larger R1 value provides less damping, but less impact on efficiency. In principle, lower value of R1 is needed to fully damp LX when VOUT /VIN ratio is high. Selecting the Output Voltage amps VIN=input voltage L=inductor value in H =efficiency (typically 0.9) tOFF=LX switch' off-time in S ILIM=1.0A or 0.65A 2. Capacitor Selection The output voltage ripple relates with the peak inductor current and the output capacitor ESR. VOUT can be simply set to 3.3V/5.0V by connecting Besides output ripple voltage, the output ripple FB pin to OUT/GND due to the use of internal resis- current also needs to be concerned. A filter ca- tor divider in the IC (Fig.34 and Fig.35). In order to pacitor with low ESR is helpful to the efficiency adjust output voltage, a resistor divider is connected to VOUT, FB, GND (Fig.36). Vout can be calculated by the following equation: and steady state output current of AIC1612. Therefore NIPPON tantalum capacitor MCM series with 100F/6V is recommended. A smaller R5=R6 [(VOUT / VREF )-1] .....................................(1) capacitor (down to 47F with higher ESR) is ac- Where VREF =1.23V and VOUT ranging from 1.8V to ceptable for light loads or in applications that can 5.5V. The recommended R6 is 240K. tolerate higher output ripple. 12 AIC1612 3. PCB Layout and Grounding and efficiency and minimize output ripple voltage, Since AIC1612's switching frequency can range use a ground plane and solder the IC's GND di- up to 500kHz, it makes AIC1612 become very rectly to the ground plane. Fig.37 to 39 are the sensitive. So careful printed circuit layout is im- recommended layout diagrams. portant for minimizing ground bounce and noise. IC's OUT pin should be as clear as possible. Ripple Voltage Reduction And the GND pin should be placed close to the Two or three parallel output capacitors can sig- ground plane. Keep the IC's GND pin and the nificantly improve ground leads of the input and output filter capaci- AIC1612. The addition of an extra input capaci- tors less than 0.2in (5mm) apart. In addition, tor results in a stable output voltage. Fig.40 keep all connection to the FB and LX pins as shows the application circuit with the above fea- short as possible. In particular, when using ex- tures. Fig. 41 to 48 are the performances of ternal feedback resistors, locate them as close Fig.40. output ripple voltage of to the FB as possible. To maximize output power APPLICATION EXAMPLES VIN VOUT R1 200 OUT DAMPING SWITCH Q3 Q1 L 22H BATT LX R1 200 0.1F R2 100K REF LBO GND LOW BATTERY OUTPUT FB AIC1612 L: TDK SLF7045T-22OMR90 C1, C3: NIPPON Tantalum Capacitor 6MCM476MB2TER GND Fig.33 Simplified Damping Switch Diagram Fig.34 VOUT = 3.3V Application Circuit. VIN VIN L 22H R1 200 R1 200 C1 47F LX BATT VOUT OUT R3 CLSEL C2 0.1F C3 47F R2 100K REF LBO C4 GND FB LOW BATTERY OUTPUT AIC1622 L: TDK SLF7045T-22OMR90 C1, C3: NIPPON Tantalum Capacitor 6MCM476MB2TER Fig.35 VOUT = 5.0V Application Circuit. LX BATT LBI R4 0.1F C4 L 22H C1 47F VOUT OUT R3 SHDN 0.1F C3 47F SHDN R4 AIC1612 R4 C2 0.1F CLSEL LBI C4 LBI VOUT OUT VIN 22H Q2 LX BATT R3 L1 C1 47F C2 0.1F CLSEL SHDN 100K R2 REF C3 47F R5 LBO GND LOW BATTERY OUTPUT FB AIC1612 R6 L: TDK SLF7045T-22OMR90 C1, C3: NIPPON Tantalum Capacitor 6MCM476MB2TER V OUT=V REF*(1+R5/R6) Fig.36 An Adjustable Output Application Circuit 13 AIC1612 Fig.37 Top layer VIN Fig.38 Bottom layer Connect to OUT for 3.3V output voltage Connect to GND for 5.0V output voltage Open for adjustable output voltage; VOUT=1.23(1+R5/R6) JU1 R5 VOUT R6 R3 1 2 R4 100K R2 VOUT 3 OUT 10 LBI LX 9 GND 8 LBO 4 CLSEL BATT 7 5 JU2 Connect to OUT for 1.0A limit Connect to GND for 0.8A limit FB REF SHDN AIC1612 6 Fig.39 Placement VIN VIN L1 + 22H + C2 6V/100uF C1 6V/100F D1 is Optional VOUT R1 200 VIN JU3 C3 0.1F + C4 1F + C5 6V/100F + C6 C7 6V/100F 6V/100F Connect to GND for shutdown Connect to VOUT for normal L1: TDK SLF7045T-22OMR90 C1~C2, C5~7: NIPPON Tantalum Capacitor 6MCM107MCTER Fig.40 AIC1612 application circuit with small ripple voltage 100 95 90 60 CLSEL=OUT (ILIMIT =1A) VIN=3.6V 50 Ripple Voltage (mV) 85 Efficiency (%) 80 VIN=2.4V 75 70 65 60 CLSEL=OUT (ILIMIT =1A) 55 50 VOUT=5.0V 45 40 VIN=1.2V 30 20 VIN=2.4V VOUT=5.0V VIN=1.2V 10 L=22H L=22H 35 30 0.01 VIN=3.6V 40 0 0.1 1 10 100 1000 0 100 Output Current (mA) Fig. 41 Efficiency (ref. to Fig.40) 200 300 400 500 600 700 Output Current (mA) Fig. 42 Ripple Voltage (ref. to Fig.40) 14 AIC1612 60 95 90 60 CLSEL=GND (ILIMIT =0.65A) VIN=3.6V 50 85 Ripple Voltage (mV) Efficiency (%) 80 75 70 VIN=2.4V 65 60 55 CLSEL=GND (ILIMIT =0.65A) 50 45 40 35 30 25 0.01 VOUT=5.0V VIN=1.2V 1 10 100 30 20 VIN=2.4V 10 L=22H 0.1 VIN=3.6V 40 0 1000 0 200 Efficiency (ref. to Fig.40) Fig. 44 VIN=2.4V Ripple Voltage (mV) Efficiency (%) CLSEL=OUT (ILIMIT =1A) 40 80 75 70 VIN=1.2V 65 60 CLSEL=OUT (ILIMIT =1A) VOUT=3.3V 35 30 25 VIN=2.4V 20 15 10 L=22H 45 40 0.01 1 10 100 0 1000 50 100 150 200 Efficiency (ref. to Fig.40) Fig. 46 300 350 400 450 500 550 600 Ripple Voltage (ref. to Fig.40) 35 CLSEL=GND (ILIMIT =0.65A) 95 30 90 80 Ripple Voltage (mV) 85 Efficiency (%) 250 Output Current (mA) 100 VIN=2.4V 75 70 65 CLSEL=GND (ILIMIT =0.65A) 55 VOUT=3.3V VIN=1.2V 25 20 VIN=2.4V 15 10 VOUT=3.3V VIN=1.2V 5 L=22H 45 40 0.01 L=22H 5 0 0.1 Fig. 45 50 VOUT=3.3V VIN=1.2V Output Current (mA) 60 500 Ripple Voltage (ref. to Fig.40) 45 85 50 400 50 90 55 300 Output Current (mA) 100 95 L=22H 100 Output Current (mA) Fig. 43 VOUT=5.0V VIN=1.2V L=22H 0 0.1 1 10 100 1000 0 50 100 Output Current (mA) Fig. 47 Efficiency (ref. to Fig.40) 150 200 250 300 350 400 Output Current (mA) Fig. 48 Ripple Voltage (ref. to Fig.40) 15 AIC1612 PHYSICAL DIMENSION 10 LEAD MSOP (unit: mm) D E E1 e A2 SYMBOL MIN MAX A1 -- 0.20 A2 0.76 0.97 b 0.15 0.30 C 0.13 0.23 D 2.90 3.10 E 4.80 5.00 E1 2.90 3.10 e C 0.40 0.66 A1 L 0.50 b L Note: Information provided by AIC is believed to be accurate and reliable. However, we cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in an AIC product; nor for any infringement of patents or other rights of third parties that may result from its use. We reserve the right to change the circuitry and specifications without notice. Life Support Policy: AIC does not authorize any AIC product for use in life support devices and/or systems. Life support devices or systems are devices or systems which, (I) are intended for surgical implant into the body or (ii) support or sustain life, and whose failure to perform, when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user. 16