ACT4514SH-T

Active-Semi FEATURES • • • • Up to 40V Input Voltage Up to 1.5A Constant Output Current Output Voltage up to 12V Patent Pending ActiveCC Constant Current Control − Integrated Current Control Improves Efficiency, Lowers Cost, and Reduces Component Count • Resistor Programmable Outputs ACT4514 APPLICATIONS • Car Charger • Rechargeable Portable Devices • General-Purpose CC/CV Power Supply Rev 1, 21-Jul-11 Wide-Input Sensorless CC/CV Step-Down DC/DC Converter GENERAL DESCRIPTION ACT4514 is a wide input voltage, high efficiency ActiveCC step-down DC/DC converter that operates in either CV (Constant Output Voltage) mode or CC (Constant Output Current) mode. ACT4514 provides up to 1.5A output current at 210kHz switching frequency. ActiveCC is a patent-pending control scheme to achieve highest accuracy sensorless constant current control. ActiveCC eliminates the expensive, high accuracy current sense resistor, making it ideal for battery charging applications and highbrightness LED drive for architectural lighting. The ACT4514 achieves higher efficiency than traditional constant current switching regulators by eliminating the sense resistor and its associated power loss. Protection features include cycle-by-cycle current limit, thermal shutdown, and frequency foldback at short circuit. The devices are available in a SOP-8 package and require very few external devices for operation. − Current Limit from 400mA to 1500mA − Patented cable compensation from DC Cable • • • • Compensation from 0Ω to 0.5Ω 2% Feedback Voltage Accuracy Up to 93% Efficiency 210kHz Switching Frequency Eases EMI Design Advanced Feature Set − Integrated Soft Start − Thermal Shutdown − Secondary Cycle-by-Cycle Current Limit − Protection Against Shorted ISET Pin SOP-8 Package • CC/CV Curve vs. Load Current 6.0 5.0 ACT4514-001 V0UT = 5V Output Voltage (V) 4.0 3.0 2.0 1.0 0.0 0 150 300 450 600 750 900 VIN = 12V VIN = 24V IOUT Current (mA) Innovative PowerTM -1- www.active-semi.com Copyright © 2011 Active-Semi, Inc. Active-Semi ORDERING INFORMATION PART NUMBER ACT4514SH-T ACT4514 Rev 1, 21-Jul-11 TEMPERATURE RANGE -40°C to 85°C PACKAGE SOP-8 PINS 8 PACKING TAPE & REEL PIN CONFIGURATION HSB IN SW GND 1 2 8 7 ISET EN COMP FB ACT4514 3 4 6 5 SOP-8 PIN DESCRIPTIONS PIN 1 2 3 4 5 6 7 8 NAME HSB IN SW GND FB COMP EN ISET DESCRIPTION High Voltage Bias Pin. This provides power to the internal high-side MOSFET gate driver. Connect a 10nF capacitor from HSB pin to SW pin. Power Supply Input. Bypass this pin with a 10µF ceramic capacitor to GND, placed as close to the IC as possible. Power Switching Output to External Inductor. Ground. Connect this pin to a large PCB copper area for best heat dissipation. Return FB, COMP, and ISET to this GND, and connect this GND to power GND at a single point for best noise immunity. Feedback Input. The voltage at this pin is regulated to 0.808V. Connect to the resistor divider between output and GND to set the output voltage. Error Amplifier Output. This pin is used to compensate the converter. Enable Input. EN is pulled up to 5V with a 4μA current, and contains a precise 0.8V logic threshold. Drive this pin to a logic-high or leave unconnected to enable the IC. Drive to a logic-low to disable the IC and enter shutdown mode. Output Current Setting Pin. Connect a resistor from ISET to GND to program the output current. Innovative PowerTM -2- www.active-semi.com Copyright © 2011 Active-Semi, Inc. Active-Semi ABSOLUTE MAXIMUM RATINGS PARAMETER IN to GND SW to GND HSB to GND FB, EN, ISET, COMP to GND Junction to Ambient Thermal Resistance Operating Junction Temperature Storage Junction Temperature Lead Temperature (Soldering 10 sec.) ACT4514 Rev 1, 21-Jul-11 VALUE -0.3 to 40 -1 to VIN + 1 VSW - 0.3 to VSW + 7 -0.3 to + 6 105 -40 to 150 -55 to 150 300 UNIT V V V V °C/W °C °C °C : Do not exceed these limits to prevent damage to the device. Exposure to absolute maximum rating conditions for long periods may affect device reliability. Innovative PowerTM -3- www.active-semi.com Copyright © 2011 Active-Semi, Inc. Active-Semi ELECTRICAL CHARACTERISTICS (VIN = 14V, TA = 25°C, unless otherwise specified.) ACT4514 Rev 1, 21-Jul-11 PARAMETER Input Voltage VIN UVLO Turn-On Voltage VIN UVLO Hysteresis VIN OVP Turn-Off Voltage VIN OVP Hysteresis Standby Supply Current Shutdown Supply Current Feedback Voltage Internal Soft-Start Time Error Amplifier Transconductance Error Amplifier DC Gain Switching Frequency Foldback Switching Frequency Maximum Duty Cycle Minimum On-Time TEST CONDITIONS Input Voltage Rising Input Voltage Falling Input Voltage Rising Input Voltage Falling VEN = 3V, VFB = 1V VEN = 3V, VO = 5V, No load VEN = 0V MIN 10 9.05 TYP 9.35 1.1 MAX 40 9.65 UNIT V V V 32.5 34.5 1.75 1.0 2.5 75 36.5 V V mA mA 100 824 µA mV µs µA/V V/V 792 808 400 VFB = VCOMP = 0.8V, ∆ICOMP = ± 10µA 650 4000 VFB = 0.808V VFB = 0V 190 210 30 240 kHz kHz 82 85 200 1.75 1.8 0.75 1 88 % ns A/V A A V A/A COMP to Current Limit Transconductance VCOMP = 1.2V Switch Current Limit Slope Compensation ISET Voltage ISET to IOUT DC Room Temp Current Gain EN Threshold Voltage EN Hysteresis EN Internal Pull-up Current High-Side Switch ON-Resistance SW Off Leakage Current Thermal Shutdown Temperature VEN = VSW = 0V Temperature Rising IOUT / ISET EN Pin Rising EN Pin Falling 0.75 Duty = 50% Duty = DMAX 25000 0.8 80 4 0.3 1 155 10 0.85 V mV µA Ω µA °C Innovative PowerTM -4- www.active-semi.com Copyright © 2011 Active-Semi, Inc. Active-Semi FUNCTIONAL BLOCK DIAGRAM IN AVIN PVIN ACT4514 Rev 1, 21-Jul-11 EN BANDGAP, REGULATOR, & SHUTDOWN CONTROL OSCILLATOR VREF = 0.808V EMI CONTROL HSB PWM CONTROLLER VREF = 0.808V SW + FB COMP CC CONTROL ISET FUNCTIONAL DESCRIPTION CV/CC Loop Regulation As seen in Functional Block Diagram, the ACT4514 is a peak current mode pulse width modulation (PWM) converter with CC and CV control. The converter operates as follows: A switching cycle starts when the rising edge of the Oscillator clock output causes the High-Side Power Switch to turn on and the Low-Side Power Switch to turn off. With the SW side of the inductor now connected to IN, the inductor current ramps up to store energy in the magnetic field. The inductor current level is measured by the Current Sense Amplifier and added to the Oscillator ramp signal. If the resulting summation is higher than the COMP voltage, the output of the PWM Comparator goes high. When this happens or when Oscillator clock output goes low, the High-Side Power Switch turns off. At this point, the SW side of the inductor swings to a diode voltage below ground, causing the inductor current to decrease and magnetic energy to be transferred to output. This state continues until the cycle starts again. The High-Side Power Switch is driven by logic using HSB as the positive rail. This pin is charged to VSW + 5V when the Low-Side Power Switch turns on. The COMP voltage is the integration of the error between FB input and the internal 0.808V reference. If FB is lower than the reference voltage, COMP tends to go higher to increase current to the output. Output current will increase until it reaches the CC limit set by the ISET resistor. At this point, the device will transition from Innovative PowerTM -5- regulating output voltage to regulating output current, and the output voltage will drop with increasing load. The Oscillator normally switches at 200kHz. However, if FB voltage is less than 0.6V, then the switching frequency decreases until it reaches a typical value of 30kHz at VFB = 0.15V. Enable Pin The ACT4514 has an enable input EN for turning the IC on or off. The EN pin contains a precision 0.8V comparator with 75mV hysteresis and a 4µA pull-up current source. The comparator can be used with a resistor divider from VIN to program a startup voltage higher than the normal UVLO value. It can be used with a resistor divider from VOUT to disable charging of a deeply discharged battery, or it can be used with a resistor divider containing a thermistor to provide a temperature-dependent shutoff protection for over temperature battery. The thermistor should be thermally coupled to the battery pack for this usage. If left floating, the EN pin will be pulled up to roughly 5V by the internal 4µA current source. It can be driven from standard logic signals greater than 0.8V, or driven with open-drain logic to provide digital on/off control. Thermal Shutdown The ACT4514 disables switching when its junction temperature exceeds 155°C and resumes when the temperature has dropped by 20°C. www.active-semi.com Copyright © 2011 Active-Semi, Inc. Active-Semi APPLICATIONS INFORMATION Output Voltage Setting Figure 1: Output Voltage Setting ACT4514 Rev 1, 21-Jul-11 Inductor Selection The inductor maintains a continuous current to the output load. This inductor current has a ripple that is dependent on the inductance value: Higher inductance reduces the peak-to-peak ripple current. The trade off for high inductance value is the increase in inductor core size and series resistance, and the reduction in current handling capability. In general, select an inductance value L based on ripple current requirement: L= Figure 1 shows the connections for setting output voltage. Select the proper ratio of the feedback resistors RFB1 and RFB2 based on output voltage. Typically, use RFB2 ≈ 10kΩ determine RFB1 from the following equation: the two the and VOUT × (VIN _VOUT ) VIN fSW ILOADMAX K RIPPLE (2) ⎛V ⎞ RFB1 = RFB2 ⎜ OUT −1⎟ ⎝ 0.808V ⎠ (1) where VIN is the input voltage, VOUT is the output voltage, fSW is the switching frequency, ILOADMAX is the maximum load current, and KRIPPLE is the ripple factor. Typically, choose KRIPPLE = 30% to correspond to the peak-to-peak ripple current being 30% of the maximum load current. With a selected inductor value the peak-to-peak inductor current is estimated as: ILPK _ PK = VOUT × (VIN _VOUT ) L × VIN × fSW CC Current Setting ACT4514 constant current value is set by a resistor connected between the ISET pin and GND. The CC output current is linearly proportional to the current flowing out of the ISET pin. The voltage at ISET is roughly 1V and the current gain from ISET to output is roughly 25000 (25mA/1µA). To determine the proper resistor for a desired current, please refer to Figure 2 below. Figure 2: Curve for Programming Output CC Current (3) The peak inductor current is estimated as: 1 ILPK = ILOADMAX + ILPK _ PK 2 (4) The selected inductor should not saturate at ILPK. The maximum output current is calculated as: IOUTMAX = ILIM _ ACT4514-002 Output Current vs. RISET 1800 1600 1 I_ 2 LPK PK (5) Output Current (mA) 1400 1200 1000 800 600 400 200 0 0 10 20 30 40 50 60 70 80 90 LLIM is the internal current limit, which is typically 2.5A, as shown in Electrical Characteristics Table. External High Voltage Bias Diode It is recommended that an external High Voltage Bias diode be added when the system has a 5V fixed input or the power supply generates a 5V output. This helps improve the efficiency of the regulator. The High Voltage Bias diode can be a low cost one such as IN4148 or BAT54. RISET (kΩ) Innovative PowerTM -6- www.active-semi.com Copyright © 2011 Active-Semi, Inc. Active-Semi APPLICATIONS INFORMATION CONT’D Figure 3: External High Voltage Bias Diode ACT4514 Rev 1, 21-Jul-11 for ceramic type. In the case of tantalum or electrolytic capacitors, the ripple is dominated by RESR multiplied by the ripple current. In that case, the output capacitor is chosen to have sufficiently low ESR. For ceramic output capacitor, typically choose a capacitance of about 22µF. For tantalum or electrolytic capacitors, choose a capacitor with less than 50mΩ ESR. Rectifier Diode Use a Schottky diode as the rectifier to conduct current when the High-Side Power Switch is off. The Schottky diode must have current rating higher than the maximum output current and a reverse voltage rating higher than the maximum input voltage. This diode is also recommended for high duty cycle operation and high output voltage applications. Input Capacitor The input capacitor needs to be carefully selected to maintain sufficiently low ripple at the supply input of the converter. A low ESR capacitor is highly recommended. Since large current flows in and out of this capacitor during switching, its ESR also affects efficiency. The input capacitance needs to be higher than 10µF. The best choice is the ceramic type, however, low ESR tantalum or electrolytic types may also be used provided that the RMS ripple current rating is higher than 50% of the output current. The input capacitor should be placed close to the IN and G pins of the IC, with the shortest traces possible. In the case of tantalum or electrolytic types, they can be further away if a small parallel 0.1µF ceramic capacitor is placed right next to the IC. Output Capacitor The output capacitor also needs to have low ESR to keep low output voltage ripple. The output ripple voltage is: VRIPPLE = IOUTMAX K RIPPLE RESR + VIN 28 × fSW LC OUT 2 (6) where IOUTMAX is the maximum output current, KRIPPLE is the ripple factor, RESR is the ESR of the output capacitor, fSW is the switching frequency, L is the inductor value, and COUT is the output capacitance. In the case of ceramic output capacitors, RESR is very small and does not contribute to the ripple. Therefore, a lower capacitance value can be used Innovative PowerTM -7- www.active-semi.com Copyright © 2011 Active-Semi, Inc. Active-Semi STABILITY COMPENSATION Figure 4: Stability Compensation ACT4514 Rev 1, 21-Jul-11 If RCOMP is limited to 15kΩ, then the actual cross over frequency is 3.4 / (VOUTCOUT). Therefore: CCOMP = 1.2 ×10 −5 VOUTCOUT (F) (14) STEP 3. If the output capacitor’s ESR is high enough to cause a zero at lower than 4 times the cross over frequency, an additional compensation capacitor CCOMP2 is required. The condition for using CCOMP2 is: ⎞ ⎛ 1.1 × 10 −6 ,0.012 × VOUT ⎟ RESRCOUT ≥ Min⎜ ⎟ ⎜C OUT ⎠ ⎝ : CCOMP2 is needed only for high ESR output capacitor (Ω) (15) The feedback loop of the IC is stabilized by the components at the COMP pin, as shown in Figure 3. The DC loop gain of the system is determined by the following equation: And the proper value for CCOMP2 is: CCOMP 2 = COUT RESRCOUT RCOMP (16) AVDC 0 . 808 V = AVEA G COMP I OUT (7) The dominant pole P1 is due to CCOMP: G EA fP1 = 2 π AVEA C COMP The second pole P2 is the output pole: I OUT fP 2 = 2 π V OUT C OUT The first zero Z1 is due to RCOMP and CCOMP: 1 f Z1 = 2π RCOMP CCOMP2 Though CCOMP2 is unnecessary when the output capacitor has sufficiently low ESR, a small value CCOMP2 such as 100pF may improve stability against PCB layout parasitic effects. Table 2 shows some calculated results based on the compensation method above. Table 1: (8) (9) Typical Compensation for Different Output Voltages and Output Capacitors VOUT 2.5V COUT 22μF Ceramic 22μF Ceramic 22μF Ceramic 47μF SP CAP 47μF SP CAP 47μF SP CAP 470μF/6.3V/30mΩ 470μF/6.3V/30mΩ 470μF/6.3V/30mΩ RCOMP 8.2kΩ 12kΩ 15kΩ 15kΩ 15kΩ 15kΩ 15kΩ 15kΩ 15kΩ CCOMP CCOMP2 2.2nF 1.5nF 1.5nF 1.5nF 1.8nF 2.7nF 15nF 22nF 27nF None None None None None None 47pF 47pF 47pF (10) 3.3V 5V 2.5V 3.3V 5V 2.5V 3.3V 5V And finally, the third pole is due to RCOMP and CCOMP2 (if CCOMP2 is used): fP 3 = 1 2πR COMP C COMP2 (11) The following steps should be used to compensate the IC: STEP 1. Set the cross over frequency at 1/10 of the switching frequency via RCOMP: R COMP = 2 πVOUT C OUT fSW 10 G EA GCOMP × 0 .808 V (Ω) (12) : CCOMP2 is needed for high ESR output capacitor. CCOMP2 ≤ 47pF is recommended. CC Loop Stability The constant-current control loop is internally compensated over the 400mA-1500mA output range. No additional external compensation is required to stabilize the CC current. = 2 . 75 × 10 8 VOUT C OUT STEP 2. Set the zero fZ1 at 1/4 of the cross over frequency. If RCOMP is less than 15kΩ, the equation for CCOMP is: C COMP 1 .8 × 10 −5 = R COMP Output Cable Resistance Compensation To compensate for resistive voltage drop across the charger's output cable, the ACT4514 integrates a -8www.active-semi.com Copyright © 2011 Active-Semi, Inc. (F) (13) Innovative PowerTM Active-Semi STABILITY COMPENSATION CONT’D simple, user-programmable cable voltage drop compensation using the impedance at the FB pin. Use the curve in Figure 4 to choose the proper feedback resistance values for cable compensation. RFB1 is the high side resistor of voltage divider. In the case of high RFB1 used, the frequency compensation needs to be adjusted correspondingly. As show in Figure 6, adding a capacitor in paralled with RFB1 or increasing the compensation capacitance at COMP pin helps the system stability. Figure 5: Cable Compensation at Various Resistor Divider Values Delta Output Voltage vs. Output Current 0.64 ACT4514-003 0.56 0.48 0.4 0.32 0.24 0.16 0.08 0 0 250 500 750 1000 VIN = 14V V0UT = 5V IISET = 1.5A k 40 k ACT4514 Rev 1, 21-Jul-11 and the schottky diode. 2) Place input decoupling ceramic capacitor CIN as close to IN pin as possible. CIN is connected power GND with vias or short and wide path. 3) Return FB, COMP and ISET to signal GND pin, and connect the signal GND to power GND at a single point for best noise immunity. 4) Use copper plane for power GND for best heat dissipation and noise immunity. 5) Place feedback resistor close to FB pin. 6) Use short trace connecting HSB-CHSB-SW loop Figure 7 shows an example of PCB layout. Delta Output Voltage (V) B1 RF =3 00 R 1 FB =2 1 R FB =2 00 k R FB 1 =1 50k R FB1 = 10 0k RFB1 = 68k RFB1 = 12k 1250 1500 Output Current (mA) Figure 6: Frequency Compensation for High RFB1 Figure 7: PCB Layout PC Board Layout Guidance When laying out the printed circuit board, the following checklist should be used to ensure proper operation of the IC. 1) Arrange the power components to reduce the AC loop size consisting of CIN, IN pin, SW pin Innovative PowerTM -9- Figure 8 and Figure 9 give two typical car charger application schematics and associated BOM list. www.active-semi.com Copyright © 2011 Active-Semi, Inc. Active-Semi Figure 8: Typical Application Circuit for 5V/1.2A Car Charger ACT4514 Rev 1, 21-Jul-11 Table 2: BOM List for 5V/1.2A Car Charger ITEM 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 REFERENCE U1 C1 C2 C3 C4 C5 C6 C7 (Optional) L1 D1 D2 R1 R2 R3 R4 DESCRIPTION IC, ACT4514SH, SOP-8 Capacitor, Electrolytic, 47µF/50V, 6.3х7mm Capacitor, Ceramic, 2.2µF/50V, 1206, SMD Capacitor, Ceramic, 1.5nF/6.3V, 0603, SMD Capacitor, Ceramic, 10nF/50V, 0603, SMD Capacitor, Electrolytic, 100µF/10V, 6.3х7mm Capacitor, Ceramic, 1µF/10V, 0603, SMD Capacitor, Ceramic, 220pF/6.3V, 0603 68µH, 1.5A, 20%, SMD CDRH125-680M Diode, Schottky, 40V/2A, SB240, DO-15 Diode, 75V/150mA, LL4148 Chip Resistor, 20kΩ, 0603, 1% Chip Resistor, 52kΩ, 0603, 1% Chip Resistor, 12kΩ, 0603, 5% Chip Resistor, 10kΩ, 0603, 1% MANUFACTURER Active-Semi Murata, TDK Murata, TDK Murata, TDK Murata, TDK Murata, TDK Murata, TDK Murata, TDK Sumida Diodes Good-ARK Murata, TDK Murata, TDK Murata, TDK Murata, TDK QTY 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Innovative PowerTM - 10 - www.active-semi.com Copyright © 2011 Active-Semi, Inc. Active-Semi Figure 9: Typical Application Circuit for 5V/0.75A Car Charger ACT4514 Rev 1, 21-Jul-11 Table 3: BOM List for 5V/0.75A Car Charger ITEM REFERENCE 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 U1 C1 C2 C3 C4 C5 C6 C7 (Optional) L1 D1 D2 R1 R2 R3 R4 DESCRIPTION IC, ACT4514SH, SOP-8 Capacitor, Electrolytic, 47µF/50V, 6.3х7mm Capacitor, Ceramic, 2.2µF/50V, 1206, SMD Capacitor, Ceramic, 1.5nF/6.3V, 0603, SMD Capacitor, Ceramic, 10nF/50V, 0603, SMD Capacitor, Electrolytic, 100µF/10V, 6.3х7mm Capacitor, Ceramic, 1µF/10V, 0603, SMD Capacitor, Ceramic, 220pF/6.3V, 0603 82µH, 1A, 20%, SMD 1058-MGDN6-00013 Diode, Schottky, 40V/2A, SB240, DO-15 Diode, 75V/150mA, LL4148 Chip Resistor, 33kΩ, 0603, 1% Chip Resistor, 52kΩ, 0603, 1% Chip Resistor, 12kΩ, 0603, 5% Chip Resistor, 10kΩ, 0603, 1% MANUFACTURER Active-Semi Murata, TDK Murata, TDK Murata, TDK Murata, TDK Murata, TDK Murata, TDK Murata, TDK Tyco Electronics Diodes Good-ARK Murata, TDK Murata, TDK Murata, TDK Murata, TDK QTY 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Innovative PowerTM - 11 - www.active-semi.com Copyright © 2011 Active-Semi, Inc. Active-Semi TYPICAL PERFORMANCE CHARACTERISTICS (Circuit of Figure 7, IISET = 0.9A, L = 82µH, CIN = 10µF, COUT = 22µF, TA = 25°C, unless otherwise specified.) ACT4514 Rev 1, 21-Jul-11 Efficiency vs. Load Current 100 VIN = 10V 90 240 ACT4514-004 220 200 180 160 140 120 100 Switching Frequency vs. Input Voltage ACT4514-005 80 70 60 50 40 10 100 VIN = 12V VIN = 24V VOUT = 5V 1000 10000 Switching Frequency (kHz) Efficiency (%) 10 12 18 24 30 32 Load Current (mA) Input Voltage (V) Switching Frequency vs. Feedback Voltage 250 1000 900 ACT4514-006 CC Current vs. Temperature ACT4514-007 VIN = 12V RISET = 33kΩ Switching Frequency (kHz) CC Current (mA) 200 800 700 600 500 400 -40 150 100 50 0 0 100 200 300 400 500 600 700 800 900 -25 0 25 50 75 80 Feedback Voltage (mV) Temperature (°C) CC Current vs. Input Voltage 1000 RISET = 33kΩ 900 2500 Peak Current Limit vs. Duty Cycle Maximum CC Current (mA) ACT4514-008 ACT4514-009 2250 2000 1750 1500 1250 1000 750 500 250 0 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 CC Current (mA) 800 700 600 500 400 10 12 18 24 30 32 Input Voltage (V) Duty Cycle Innovative PowerTM - 12 - www.active-semi.com Copyright © 2011 Active-Semi, Inc. Active-Semi TYPICAL PERFORMANCE CHARACTERISTICS CONT’D (Circuit of Figure 7, IISET = 0.9A, L = 82µH, CIN = 10µF, COUT = 22µF, TA = 25°C, unless otherwise specified.) ACT4514 Rev 1, 21-Jul-11 Shutdown Current vs. Input Voltage (EN pulled low) 140 120 100 80 60 40 20 0 0 5 10 15 20 25 30 35 40 2000 Standby Supply Current vs. Input Voltage ACT4514-011 Standby Supply Current (µA) ACT4514-010 1800 1600 1400 1200 1000 800 600 400 200 0 0 5 10 15 20 25 30 35 40 Shutdown Current (µA) Input Voltage (V) Input Voltage (V) Reverse Leakage Current (VIN Floating) 100 ACT4514-012 Start up into CV Load ACT4514-013 V0UT = 5V CV = 3.2V IISET = 0.9A VIN = 12V Reverse Leakage Current (µA) 80 60 CH1 40 20 CH2 0 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 VOUT (V) CH1: IOUT, 500mA/div CH2: VOUT, 2V/div TIME: 200µs/div Start up into CV Load ACT4514-014 V0UT = 5V CV = 3.2V IISET = 0.9A VIN = 24V SW vs. Output Voltage Ripples ACT4514-015 VIN = 12V V0UT = 5V I0UT = 0.9A CH1 CH1 CH2 CH2 CH1: IOUT, 500mA/div CH2: VOUT, 2V/div TIME: 200µs/div CH1: SW, 10V/div CH2: VOUT_RIPPLE, 50mV/div TIME: 2µs/div Innovative PowerTM - 13 - www.active-semi.com Copyright © 2011 Active-Semi, Inc. Active-Semi TYPICAL PERFORMANCE CHARACTERISTICS CONT’D (Circuit of Figure 7, IISET = 0.9A, L = 82µH, CIN = 10µF, COUT = 22µF, TA = 25°C, unless otherwise specified.) ACT4514 Rev 1, 21-Jul-11 SW vs. Output Voltage Ripples ACT4514-016 VIN = 24V V0UT = 5V I0UT = 0.9A VIN = 12V V0UT = 5V I0UT = 0.9A Start up with EN ACT4514-017 CH1 CH1 CH2 CH2 CH1: SW, 10V/div CH2: VRIPPLE, 50mV/div TIME: 2µs/div CH1: EN, 1V/div CH2: VOUT, 1V/div TIME: 10ms/div Start up with EN ACT4514-018 VIN = 24V V0UT = 5V IISET = 0.9A Load Step Waveforms ACT4514-019 VIN = 12V V0UT = 5V IISET = 0.9A CH1 CH1 CH2 CH2 CH1: EN, 1V/div CH2: VOUT, 1V/div TIME: 10ms/div CH1: IOUT, 500mA/div CH2: VOUT, 500mV/div TIME: 100μs/div Load Step Waveforms ACT4514-020 VIN = 24V V0UT = 5V IISET = 0.9A Short Circuit ACT4514-021 VIN = 12V V0UT = 5V IISET = 0.9A CH1 CH1 CH2 CH2 CH3 CH1: IOUT, 500mA/div CH2: VOUT, 500mV/div TIME: 100μs/div CH1: VOUT, 2V/div CH2: IOUT, 1A/div CH3: SW TIME: 20µs/div Innovative PowerTM - 14 - www.active-semi.com Copyright © 2011 Active-Semi, Inc. Active-Semi TYPICAL PERFORMANCE CHARACTERISTICS CONT’D (Circuit of Figure 7, IISET = 0.9A, L = 82µH, CIN = 10µF, COUT = 22µF, TA = 25°C, unless otherwise specified.) ACT4514 Rev 1, 21-Jul-11 Short Circuit ACT4514-022 VIN = 24V V0UT = 5V IISET = 0.9A VIN = 12V V0UT = 5V IISET = 0.9A Short Circuit Recovery ACT4514-023 CH1 CH1 CH2 CH2 CH3 CH3 CH1: VOUT, 2V/div CH2: IOUT, 1A/div CH3: SW TIME: 20µs/div CH1: VOUT, 2V/div CH2: IOUT, 1A/div CH3: SW TIME: 20µs/div Short Circuit Recovery ACT4514-024 VIN = 24V V0UT = 5V IISET = 0.9A CH1 CH2 CH3 CH1: VOUT, 2V/div CH2: IOUT, 1A/div CH3: SW TIME: 20µs/div Innovative PowerTM - 15 - www.active-semi.com Copyright © 2011 Active-Semi, Inc. Active-Semi PACKAGE OUTLINE SOP-8 PACKAGE OUTLINE AND DIMENSIONS C D ACT4514 Rev 1, 21-Jul-11 SYMBOL A E1 E DIMENSION IN MILLIMETERS MIN 1.350 0.100 1.350 0.330 0.190 4.700 3.800 5.800 DIMENSION IN INCHES MIN 0.053 0.004 0.053 0.013 0.007 0.185 0.150 0.228 L MAX 1.750 0.250 1.550 0.510 0.250 5.100 4.000 6.300 MAX 0.069 0.010 0.061 0.020 0.010 0.201 0.157 0.248 A1 A2 ? θ e B B C D A1 E A A2 E1 e L θ 1.270 TYP 0.400 0° 1.270 8° 0.050 TYP 0.016 0° 0.050 8° Active-Semi, Inc. reserves the right to modify the circuitry or specifications without notice. Users should evaluate each product to make sure that it is suitable for their applications. Active-Semi products are not intended or authorized for use as critical components in life-support devices or systems. Active-Semi, Inc. does not assume any liability arising out of the use of any product or circuit described in this datasheet, nor does it convey any patent license. Active-Semi and its logo are trademarks of Active-Semi, Inc. For more information on this and other products, contact sales@active-semi.com or visit http://www.active-semi.com. ® is a registered trademark of Active-Semi. - 16 www.active-semi.com Copyright © 2011 Active-Semi, Inc. Innovative PowerTM