30V 3.0A Synchronous CV/CC Step-Down Converter. Efficiency(%) 100nF BS SW AP2960 EN FB. 220μF 4.7μF. C2 4.7nF

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1 30V 3.0A Synchronous V/ Step-Down onverter General Description AP2960 is a wide input voltage, high efficiency Synchronous /V step-down D/D converter that operates in either V (onstant Output Voltage) mode or (onstant Output urrent) mode. AP2960 provides up to 3.0A output current at 350kHz switching frequency. AP2960 eliminates the expensive, high accuracy current sense resistor, making it ideal for battery charging applications and adaptors with accurate current limit. The AP2960 achieves higher efficiency than traditional constant current switching regulators by eliminating its associated power loss on the additional current sensing resistor. Protection features include cycle-by-cycle current limit, thermal shutdown, and short circuit recovery. AP2960 are available in a SOP8-EP package and require very few external devices for operation. Resistor Programmable urrent Limit from.5a to 3.0A Up to 0.5V Excellent able Voltage Drop ompensation ±7.5% Accuracy 2% Feedback Voltage Accuracy Advanced Feature Set Integrated Soft Start Thermal Shutdown ycle-by-ycle urrent Limit SOP8-EP Package Efficiency VS. Applications ar harger/ Adaptor Rechargeable Portable Devices General-Purpose /V Supply Features 30V Input Voltage Surge 28V Steady State Operation Up to 3.0A Output urrent 350kHz Switching Frequency Up to 93% Efficiency Stable with Low-ESR eramic apacitors to Allow Low-Profile Designs onstant urrent ontrol Without Additional urrent Sensing Resistor Improves Efficiency and Lowers ost. Efficiency(%) Vin=24V 20 Vin=28V 0 Vin=2V Iout(A) Typical Application ircuit 3 00nF V 2V ~24V BS L 5μH V 5V, 2.5A E 220μF R 00kΩ 4.7μF R3.5kΩ AP2960 EN FB ISET GND 0kΩ R nF 05kΩ R6 4 E2 5 R4 9.6kΩ 4.7μF 220μF 4.7μF GND 深圳市雅创威电子有限公司 TEL: QQ: 十年代理品质如一 Wuxi Microelectronics Limited Rev. 0.0 /

2 Ordering Information Order codes Mark Package AP2960SPER AP2960 YYWWP.YYWW=date code,p= Package factory SOP8-EP Package SOP8-EP BS ISET AP2960 EN GND FB Pin Description Pin No. Pin Name Pin Function BS 2 High Side Bias Pin. This provides power to the internal high-side MOSFET gate driver. onnect a 00nF capacitor from BS pin to pin. Power Supply Input. Bypass this pin with a minimum 4.7μF ceramic capacitor to GND, placed as close to the I as possible. 3 Power Switching Output to External Inductor. 4 GND 5 FB 6 7 EN 8 ISET 9 Exposed Pad Ground. onnect this pin to a large PB copper area for best heat dissipation. Return FB,, 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. onnect 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 2M resistance, and contains a precise.6v logic threshold. Drive this pin to a logichigh or leave unconnected to enable the I. Drive to a logic-low to disable the I and enter shutdown mode. Output urrent Setting Pin. onnect a resistor from ISET to GND to program the output current. Heat Dissipation Pad. onnect this exposed pad to large ground copper area with copper and vias. 深圳市雅创威电子有限公司 TEL: QQ: 十年代理品质如一 ( Wuxi Microelectronics Limited Rev /

3 Functional Block Diagram AV PV EN 2MΩ BANDGAP, REGULATOR, & SHUTDOWN ONTROL VREF=0.808V OSILLATOR EMI ONTROL 0.2Ω BS Σ PWM ONTROLLER FB VREF=0.808V + - ONTROL 0.Ω ISET Figure Functional Block Diagram 深圳市雅创威电子有限公司 TEL: QQ: 十年代理品质如一 ( Wuxi Microelectronics Limited Rev /

4 (Note ) Absolute Maximum Ratings Input Supply Voltage -0.3V~30V Voltage -0.3V~30V Boost Voltage -0.3 ~ (V+5.5V) EN Pin -0.3V ~ 6V FB ISET Pin -0.3V ~ 5.5V Junction Temperature Internal limit Storage Temperature -55 ~ 50 Lead Temperature (Soldering 0 sec.) 260 ESD Rating per ESDA/JEDE JS Human Body Mode......±4 kv Operating Ratings Input Supply Voltage 6V ~ 28V Operating Temperatur 40 to +85 Max Junction Temperature -40 ~ 25 Package Thermal Resistance θ JA 50 /W θ J 5 /W Note : Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Electrical haracteristics (V = 2V, TA = +25, unless otherwise noted.) Parameter Symbol onditions Min Typ Max Unit Input Supply Voltage Input Voltage 6 28 V Input UVLO UVLO Threshold VUVLO V Rising V Hysteresis VHYS V Falling 0.3 V Input Supply urrent Standby Supply urrent (no load) IQ VFB = 0.8V 3 ma Standby Supply urrent IV VFB = V 2.5 ma Shutdown Supply urrent 0 µa ENABLE Enable threshold (High) VEN_HIGH V Enable threshold (Low) VEN_LOW.3 V Enable internal pull up IEN 6 µa able ompensation ISET voltage VISET V ISET to I D urrent Gain ISETGA RISET =.5kΩ A/A Error Amplifier Output sink current ISK VFB=0.7V 00 µa Output source current ISOURE VFB=0.9V 00 µa Open loop gain GVO 4000 Input voltage VI V Output Voltage Feedback voltage VFB mv Feedback current IFB 50 na Frequency Operation frequency Fsw_0.8V VFB = 0.8V 350 khz Hiccup Waiting Time Fsw_0V VFB = 0V 20 ms Maximum duty cycle D max Fsw = 350kHz 93 % Minimum duty cycle D min Fsw = 350kHz 7 % 深圳市雅创威电子有限公司 TEL: QQ: 十年代理品质如一 ( Wuxi Microelectronics Limited Rev /

5 Electrical haracteristics (ontinued) (V = 2V, TA = +25, unless otherwise noted.) MOSFET High Side MOSFET On Resistance () RDS(ON_H) 0.2 Ω Low Side MOSFET On Resistance () RDS(ON_L) 0. Ω High-Side MOSFET Leakage urrent RDS(HIGH_LEAK) V = 0V μa Low-Side MOSFET Leakage urrent RDS(LOW_LEAK) V = V μa urrent Limit High Side MOSFET current Limit ILIM_HS RISET=5.kΩ 3.8 A ISET voltage I / ISET, VISET RISET =.5kΩ V Soft start Soft start time () TSS 2 ms Thermal Shutdown Thermal Shutdown threshold () TSDN 65 Thermal Shutdown Hysteresis TSDN_HYS 25 Notes: () Guaranteed by design. 深圳市雅创威电子有限公司 TEL: QQ: 十年代理品质如一 ( Wuxi Microelectronics Limited Rev /

6 Functional Description V/ Loop Regulation As seen in Functional Block Diagram, the AP2960 is a peak current mode pulse width modulation (PWM) converter with and V 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 side of the inductor now connected to V, the inductor current ramps up to store energy in the magnetic field. The inductor current level is measured by the urrent Sense Amplifier and added to the Oscillator ramp signal. If the resulting summation is higher than the voltage, the output of the PWM omparator goes high. When this happens or when Oscillator clock output goes low, the High-Side Power Switch turns off. At this point, the side of the inductor swings to ground through the internal Low Side Power Switch, 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 BS as the positive rail. This pin is charged to V + 5V when the Low-Side Power Switch turns on. The voltage is the integration of the error between FB input and the internal 0.808V reference. If FB is lower than the reference voltage, tends to go higher to increase current to the output. Output current will increase until it reaches the limit set by the ISET resistor. At this point, the device will be transition from regulating output voltage to regulating output current, and the output voltage will drop with increasing load. The Oscillator normally switches at 350kHz. However, if FB voltage is lower than 0.25V, AP2960 will go into short circuit of auto-restart mode with very low power. Enable Pin The AP2960 has an enable input EN for turning the I on or off. The EN pin contains a precision.6v comparator with 300mV hysteresis and a 2M pullup resistance. The comparator can be used with a resistor divider from V to program a startup voltage higher than the normal UVLO value. It can be used with a resistor divider from V 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 2M pull-up resistance. It can be driven from standard logic signals greater than.6v, or driven with open-drain logic to provide digital on/off control. Thermal Shutdown The AP2960 disables switching when its junction temperature exceeds 60 and resumes when the temperature has dropped by 25. APPLIATIONS FORMATION Output Voltage Setting Figure 2: Output Voltage Setting FB R FB R FB2 Vout Figure 2 shows the connections for setting the output voltage. Select the proper ratio of the two feedback resistors RFB and RFB2 based on the output voltage. Adding a capacitor in parallel with RFB helps the system stability. Typically, use RFB2 20kΩ and determine RFB from the following equation: R FB V RFB V urrent Setting AP2960 constant current value is set by a resistor connected between the ISET pin and GND. The output current is approximating linearly proportional to the current flowing out of the ISET pin. The voltage at ISET is roughly V and the current gain from ISET to output is roughly (30mA/μA). To determine the proper resistor for a desired current, please refer to Figure 5 below. Figure 3: urve for Programming Output urrent Output urrent(a) Output urrent vs R ISET Vin=2V,Vout=4.0V R ISET (kω) 深圳市雅创威电子有限公司 TEL: QQ: 十年代理品质如一 ( Wuxi Microelectronics Limited Rev /

7 Figure 4: /V urve(r3=.5k, R4=9.6k, R6=05k) Output Voltage (V) 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: V V V L V f I K LOADMAX RIPPLE where V is the input voltage, V is the output voltage, f 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: I LPK PK V V -V L V f The peak inductor current is estimated as: I LPK I LOADMAX I 2 LPK PK The selected inductor should not saturate at ILPK. The maximum output current is calculated as: I MAX I LIM I 2 /V urve Output urrent (A) LPK PK LLIM is the internal current limit, which is typically 3.8A, as shown in Electrical haracteristics 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 Vin=2V Vin=24V Vin=28V 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 448 or BAT54. Figure 5: External High Voltage Bias Diode 5V BS 00nF This diode is also recommended for high duty cycle operation and high output voltage applications. Input apacitor 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 4.7μF. 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 and GND pins of the I, with the shortest traces possible. In the case of tantalum or electrolytic types, they can be further away if a small parallel 4.7μF ceramic capacitor is placed right next to the I. Output apacitor The output capacitor also needs to have low ESR to keep low output voltage ripple. The output ripple voltage is: V V RIPPLE I MAX K RIPPLER ESR 2 8 f L Where IMAX is the maximum output current, KRIPPLE is the ripple factor, RESR is the ESR of the output capacitor, f is the switching frequency, L is the inductor value, and 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 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 4.7μF. For tantalum or electrolytic capacitors, choose a capacitor with less than 50mΩ ESR. 深圳市雅创威电子有限公司 TEL: QQ: 十年代理品质如一 ( Wuxi Microelectronics Limited Rev /

8 STABILITY ENSATION Figure 6: Stability ompensation R 2 2 is needed only for high ESR output capacitor The feedback loop of the I is stabilized by the components at the pin, as shown in Figure 6. The D loop gain of the system is determined by the following equation: A VD 0.808V I A VEA G The dominant pole P is due to : f P GEA 2A VEA The second pole P2 is the output pole: f P2 I 2V The first zero Z is due to R and : f Z 2R And finally, the third pole is due to R and 2 (if 2 is used): f P3 2R 2 The following steps should be used to compensate the I: STEP. Set the cross over frequency at /0 of the switching frequency via R: R 2V 0G G EA f 0.808V V STEP 2. Set the zero fz at /4 of the cross over frequency. If R is less than 5kΩ, the equation for is: R F 5 If R is limited to 5kΩ, then the actual cross over frequency is 6.58 / (V). Therefore: V F 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 2 is required. The condition for using 2 is: R ESR Min,0. 006V And the proper value for 2 is: 2 R R ESR Though 2 is unnecessary when the output capacitor has sufficiently low ESR, a small value 2 such as 00pF may improve stability against PB layout parasitic effects. Table shows some calculated results based on the compensation method above. Table : Typical ompensation for Different Output Voltages and Output apacitors Vout out R 2 3.3V 47uF eramic AP 0KΩ 4.7nF None 5.0V 47uF eramic AP 0KΩ 4.7nF None 3.3V 220uF/0V/30mΩ 0KΩ 4.7nF None 5.0V 220uF/0V/30mΩ 0KΩ 4.7nF None Loop Stability The constant-current control loop is internally compensated over the 500mA-3000mA output range. No additional external compensation is required to stabilize the current. Output able Voltage-Drop ompensation To compensate for resistive voltage drop across the charger's output cable, the AP2960 integrates a simple, user-programmable cable voltage drop compensation using the impedance at the FB pin. Use the curve in Figure 7 to choose the proper feedback resistance values for cable compensation. RFB is the high side resistor of voltage divider. In the case of high RFB used, the frequency compensation needs to be adjusted correspondingly. As show in Figure 8, adding a capacitor in paralleled with RFB or increasing the compensation capacitance at pin helps the system stability. 深圳市雅创威电子有限公司 TEL: QQ: 十年代理品质如一 ( Wuxi Microelectronics Limited Rev /

9 Figure 7: able Voltage-Drop ompensation at Various Resistor Divider Values Delta Output Voltage(mV) Delta Output Voltage vs Output urrent (vs R FB ) K 360K 300K 240K 200K 50K 00K 5K ) Arrange the power components to reduce the A loop size, consisting of input ceramic capacitor, V pin, pin. 2) Place input decoupling ceramic capacitor as close to V pin as possible. is connected power GND with vias or short and wide path. 3) Return FB, and ISET to signal GND pin, and connect the signal GND to power GND at a single point for best noise immunity. onnect exposed pad to power ground copper area with copper and vias. 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 BS-3- loop. Figure 9: Example of PB Layout Output urrent(a) Figure 8: Frequency ompensation for High RFB V R FB FFD nf FB R R FB2 2 P Board Layout Guidance Figure 9 showed the example of components placement and PB layout. When laying out the printed circuit board, the following checklist should be used to ensure proper operation of the I. 深圳市雅创威电子有限公司 TEL: QQ: 十年代理品质如一 ( Wuxi Microelectronics Limited Rev /

10 Package Information SOP8-EP c D θ L' E E2 E L L b D A2 A e A Symbol A A A2 b c D D E E E2 e L L L-L' θ Dimensions In Millimeters Dimensions In Inches Min Max Min Max (BS) 0.050(BS) REF 0.04REF 深圳市雅创威电子有限公司 TEL: QQ: 十年代理品质如一 Wuxi Microelectronics Limited Rev /

11 Important Notice Microelectronics o. Ltd. reserves the right to make changes without further notice to any products or specifications herein. Microelectronics o. Ltd. does not assume any responsibility for use of any its products for any particular purpose, nor does Microelectronics o. Ltd assume any liability arising out of the application or use of any its products or circuits. Microelectronics o. Ltd does not convey any license under its patent rights or other rights nor the rights of others. 深圳市雅创威电子有限公司 TEL: QQ: 十年代理品质如一 ( Wuxi Microelectronics Limited Rev. 0.0 /

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