 |
|
| If you can't view the Datasheet, Please click here to try to view without PDF Reader . |
|
|
|
| If you can't view the Datasheet, Please click here to try to view without PDF Reader . |
|
|
| Datasheet File OCR Text: |
| XC9510 Series Preliminary ! Input Voltage Range ! Output Voltage Range 2.4V ~ 6.0V DC/DC VR VD 0.9 ~ 4.0V (2%) 0.9 ~ 4.0V (2%) 0.9 ~ 5.0V (2%) 800mA 600mA October 28, 2003 Ver. 4 Synchronous Step-Down DC/DC Converter with Built-In LDO Regulator In Series plus Voltage Detector ! Switching Frequency ! Output Current ! Ultra Small Packages ! Ceramic Capacitor Compatible 300kHz, 600kHz, 1.2MHz DC/DC VR SOP-8 ! APPLICATIONS " CD-R / RW, DVD " HDD " PDAs, portable communication modem " Cellular phones " Palmtop computers " Cameras, video recorders ! GENERAL DESCRIPTION The XC9510 series consists of a step-down DC/DC converter and a high-speed LDO regulator connected in series with the DC/DC converter's output. A voltage detector is also built-in. A highly efficient, low noise output is possible since the regulator is steppeddown further from the DC/DC output. The DC/DC converter block incorporates a P-Channel driver transistor and a synchronous N-Channel switching transistor. With an external coil, diode and two capacitors, the XC9510 can deliver output currents up to 800mA at efficiencies over 90%. The XC9510 is designed for use with small ceramic capacitors. A choice of three switching frequencies are available, 300 kHz, 600 kHz, and 1.2 MHz. Output voltage settings for the DC/DC and VR are set-up internally in 0.1V steps within the range of 0.9V to 4.0V ( 2.0%). For the VD, the range is of 0.9V to 5.0V ( 2.0%). The soft start time of the series is internally set to 5ms. With the builtin U.V.L.O. (Under Voltage Lock Out) function, the internal P-channel driver transistor is forced OFF when input voltage becomes 1.4 V or lower. The operational states of the DC/DC and the regulator blocks can be changed by inputting three kinds of voltage level via the CE/MODE pin. The functions of the MODE pin can be selected via the external control pin to switch the DC/DC control mode and the disable pin to shut down the regulator block. ! FEATURES Input Voltage Range : Load Capacitors : 2.4V ~ 6.0V Ceramic Capacitors Compatible (Low ESR Capacitors) VD Function : Detects output voltage from the VDOUT pin while sensing either VDD, DCOUT, or VROUT internally. Nch Open Drain Output Output Voltage Range : 0.9 ~ 4.0V (Accuracy 2%) Output Current : Controls : 800mA PWM Control PWM, PWM / PFM Automatic Switching External Oscillation Frequency : 300kHz, 600kHz, 1.2MHz Output Voltage Range : 0.9 ~ 4.0V (Accuracy 2%) Current Limit Dropout Voltage : High Ripple Rejection 600mA 240mV @ IOUT=300mA (VOUT=2.8V) 60dB @1kHz (VOUT=2.8V) ! TYPICAL APPLICATION CIRCUIT ! TYPICAL PERFORMANCE CHARACTERISTICS XC9510Hxxxx DC/DC Efficiency (DCOUT:3.4V, 1.2MHz), VR Efficiency (VROUT:3.0V) VIN=5.0V, Topr=25 C, L:4.7uH(CDRH4D28C), CIN:4.7uF(ceramic), CL1:10uF(ceramic), CL2:1uF(ceramic) 100 O 90 () SD 1 2 3 CIN 4 VDOUT AGND 5 LX PGND CE/ DCOUT MODE VDD VROUT 8 7 6 DCOUT Efficiency EFFI (%) L CL1 80 70 60 50 40 30 20 PWM/PFM switching control PWM control VROUT CL2 SOP-8 (Top View) 10 0 0.1 1 10 100 DC/DC Output Current IDOUT VR Output Current IROUT (mA) 1000 Semiconductor Ltd. Data Sheet 1 XC9510 Series Synchronous Step-Down DC/DC Converter with Built-In LDO Regulator In Series plus Voltage Detector Preliminary ! PIN CONFIGURATION ! PIN ASSIGNMENT PIN NUMBER PIN NAME PGND CE/MODE VDD VDOUT AGND VROUT DCOUT LX FUNCTION Power Ground Chip Enable / MODE Switch Power Supply VD Output Analog Ground VR Output DC/DC Output Switch PGND 1 CE/MODE 2 VDD 3 VDOUT 4 8 LX 7 DCOUT 6 VROUT 5 AGND 1 2 3 4 5 6 7 SOP-8 (Top View) 8 ! SELECTION GUIDE " Ordering Information XC9510 123456 SYMBOL The input for the voltage regulator block comes from the DC/DC. DESCRIPTION DESIGNATOR 1 23 4 5 6 3 6 C S Control Methods and MODE pins, the VD Sense pin (See the chart below) Setting voltage and specifications of each DC/DC, VR, and VD (Based on the internal standard) Oscillation Frequency of DC/DC : 300kHz 600kHz 1.2MHz Package Type : SOP-8 Device Orientation : R L Embossed Tape : Standard feed Embossed Tape : Reverse feed $ Control Methods, CE/MODE Pin, VDSENSE SERIES 1 A B C D DC/DC CONTROL METHODS CE/MODE PINS (H LEVEL) CE/MODE PINS (M LEVEL) CE/MODE PINS (L LEVEL) VD SENSE VDD PWM Control VR : OFF - DCOUT VROUT VDD XC9510 E F H K L PWM, PFM/PWM Manual Switch VR : ON Stand-by Mode (Except for VD) DCOUT VROUT PFM/PWM Automatic Switch VDD PWM Control DCOUT VROUT Semiconductor Ltd. Data Sheet 2 XC9510 Series Synchronous Step-Down DC/DC Converter with Built-In LDO Regulator In Series plus Voltage Detector Preliminary ! PACKAGING INFORMATION $ SOP-8 ! BLOCK DIAGRAM DCOUT Phase Compensation + + logic Buffer, Driver Vref with soft start PWM/PFM Controller Current Limit & Feedback R amp Wave Generator, OSC L X CE/MODE ON/OFF& MODE CONTROL PGND eac h circuit VDD VROUT U.V.L.O. + Current Li mi t + VDOUT + Vref SENSE (VDD or DCOUT or VROUT) Vref AGND * Diodes shown in the above circuits are protective diodes. ! ABSOLUTE MAXIMUM RATINGS Ta=25OC PARAMETER VDD Pin Voltage DCOUT Pin Voltage VROUT Pin Voltage VDOUT Pin Voltage LX Pin Voltage CE/MODE Pin Voltage Continuous Power Dissipation (*1) Operating Temperature Range Storage Temperature Range (*1) IOUT = Pd / (VIN - VOUT) when PC board mounting. (*2) Package power dissipation Semiconductor Ltd. SYMBOL AVDD DCOUT VROUT VDOUT LX CE/MODE Pd Topr Tstg RATINGS - 0.3 ~ 6.5 - 0.3 ~ VDD + 0.3 - 0.3 ~ VDD + 0.3 - 0.3 ~ VDD + 0.3 - 0.3 ~ VDD + 0.3 - 0.3 ~ VDD + 0.3 650 - 40 ~ + 85 - 55 ~ + 125 UNITS V V V V V V mW O SOP-8 C C O Data Sheet 3 XC9510 Series Synchronous Step-Down DC/DC Converter with Built-In LDO Regulator In Series plus Voltage Detector Preliminary ! ELECTRICAL CHARACTERISTICS XC9510HxxCSx $ Common Characteristics PARAMETER Supply Current 1 Supply Current 2 Stand-by Current (note 1) Input Voltage Range U.V.L.O. Voltage (note 2) CE 'H' Level Voltage CE 'M' Level Voltage CE 'L' Level Voltage CE 'H' Level Current CE 'L' Level Current $ DC/DC Converter (2.2V product) PARAMETER Output Voltage Oscillation Frequency Maximum Duty Ratio Minimum Duty Ratio PFM Duty Ratio LX SW 'High' On Resistance (note 3) LX SW 'Low' On Resistance Maximum Output Current Current Limit Efficiency (note 4) Output Voltage Temperature Characteristics Soft Start Time Latch Time (note 5) SYMBOL DCOUT FOSC MAXDUTY MINDUTY PFMDUTY RLXH RLXL IMAX1 ILIM1 EFFI ! VOUT Connected to the external components, IDOUT=100mA CONDITIONS Connected to the external components, IDOUT=30mA Connected to the external components, IDOUT=10mA DCOUT=0V DCOUT=VIN Connected to the external components, No Load DCOUT=0V, LX=VIN-0.05V MIN. 2.156 1.02 100 21 800 TYP. 2.200 1.20 30 0.5 0.5 1.2 90 100 5 8 MAX. 2.244 1.38 0 38 UNITS V MHz % % % mA A % ppm /OC mS mS Ta=25OC SYMBOL IDD1 IDD2 ISTB VIN VUVLO VCEH VCEM VCEL ICEH ICEL CONDITIONS VIN=CE=DCOUT=5.0V VIN=CE=5.0V, DCOUT=0V VIN=6.5V, CE=0V MIN. 2.4 1.00 0.6 VSS - 0.1 - 0.1 TYP. 300 240 0.6 1.40 MAX. 2.5 6.0 1.78 VDD VDD-1.2 0.25 0.1 0.1 UNITS V V V V V TEST CIRCUIT 1 1 1 3 3 3 3 1 1 Ta=25OC TEST CIRCUIT 3 3 4 4 3 5 3 6 3 3 3 3 Ta=25OC IDOUT=30mA ! Topr " VOUT -40OC - $ Regulator (1.8V product) PARAMETER Output Voltage Maximum Output Current Load Regulation Dropout Voltage 1 (note 6) Dropout Voltage 2 Line Regulation Current Limit Short-Circuit Current Ripple Rejection Rate Output Voltage Temperature Characteristics SYMBOL VROUT(E) IMAX2 ! VROUT Vdif 1 Vdif 2 ! VOUT ! VIN " VOUT ILIM2 ISHORT PSRR 1mA 2 2 2 2 2 2 7 7 2 2 ! VOUT IROUT=30mA ! Topr " VOUT -40OC Data Sheet 4 XC9510 Series Synchronous Step-Down DC/DC Converter with Built-In LDO Regulator In Series plus Voltage Detector Preliminary ! ELECTRICAL CHARACTERISTICS (Continued) $ Detector (2.7V product) PARAMETER Detect Voltage Hysteresis Range VD Output Current Output Voltage Temperature Characteristics Test Conditions : SYMBOL VDF VHYS IVD ! VDF ! Topr " VDF VDOUT=0.5V -40OC 8 9 8 - - Unless otherwise stated; VD : VIN=6.0V DC/DC : VIN=3.6V [@ DCOUT:2.2V] VR : VIN = VROUT(T) + 1.0 (V) [When VROUT(T) <1.4V, VIN =2.4V] note 1 : VD operates when in stand-by mode. note 2 : Including hysteresis operating voltage range. note 3 : On resistance = 0.05V / ILX note 4 : EFFI = { ( Output Voltage x Output Current ) / ( Input Voltage x Input Current) } x 100 note 5 : Time until it short-circuits DCOUT with GND through 1 of resistance from a state of operation and is set to DCOUT=0V from current limit pulse generating. note 6 : Vdif = (VIN1 (note 7) - VROUT1 (note 8 ) ) note 7 : VIN 1 = The input voltage when VROUT1 appears as input voltage is gradually decreased. note 8 : VROUT1 = A voltage equal to 98% of the output voltage whenever an amply stabilized IOUT {VROUT(T) + 1.0V} is input. Semiconductor Ltd. Data Sheet 5 XC9510 Series Synchronous Step-Down DC/DC Converter with Built-In LDO Regulator In Series plus Voltage Detector Preliminary ! TEST CIRCUITS Circuit 1 Supply Current, Stand-by Current, CE Current 1 2 3 PGND CE/ MODE VDD VDOUT LX DCOUT VROUT AGND 8 DCOUT : VIN or GND 7 6 5 Circuit 2 Output Voltage (VR), Load Stability, Dropout Voltage, CE Current (MODE Current) 1 2 3 4 PGND CE/ MODE VDD VDOUT LX DCOUT VROUT AGND 8 7 6 5 CE/MODE : VIN or VIN-1.2V or GND A A 4 V V IROUT CIN : 1.0uF (ceramic) CIN : 4.7uF (ceramic) CL:1.0uF(ceramic, 2.2uF(ceramic, VROUT>1.5V) VROUT<1.5V) Circuit 3 Output Voltage (DC/DC) Oscillation Frequency, U.V.L.O. Voltage, Softstart Time, Latch Time, CE Voltage, (PFM Duty Cycle), (MODE Voltage) L 1 2 3 4 PGND CE/ MODE VDD VDOUT LX DCOUT VROUT AGND 8 7 6 5 CL : 10uF (ceramic) Circuit 4 Minimum Duty Cycle, Maximum Duty Cycle 1 CE : VIN 2 3 PGND CE/ MODE VDD VDOUT LX DCOUT VROUT AGND 8 7 6 5 200 V IDOUT 4 V V CIN : 4.7uF (ceramic) FOSC 300kHz 600kHz 1.2MHz L 22uH 10uH 4.7uH CIN : 1.0uF(ceramic) Circuit 5 Lx ON Resistance Circuit 6 Current Limit 1 (DC/DC) L 1 CE : VIN 2 3 4 PGND CE/ MODE VDD VDOUT LX DCOUT VROUT AGND 8 7 6 5 A CE : VIN 1 2 3 4 PGND CE/ MODE VDD VDOUT LX DCOUT VROUT AGND 8 7 6 5 IDOUT V CIN : 1.0uF (ceramic) CIN : 4.7uF (ceramic) Circuit 7 Current Limit 2 (VR), Short Protection (VR) Circuit 8 Detect Voltage, Release Voltage 1 CE : VIN 2 3 4 PGND CE/ MODE VDD VDOUT LX DCOUT VROUT AGND 8 7 6 5 VD_SENSE (DCOUT or VROUT) 1 CE/MODE : VSS 2 3 200k 4 PGND CE/ MODE VDD VDOUT LX DCOUT VROUT AGND 8 7 6 5 A V V V CIN: 1uF CIN : 4.7uF (ceramic) CL : 1.0uF (ceramic) Circuit 9 VD Output Current VD_SENSE (DCOUT or VROUT) 1 CE : VSS 2 3 PGND CE/ MODE VDD VDOUT LX DCOUT VROUT AGND 8 7 6 5 A V CIN : 1uF 4 Semiconductor Ltd. Data Sheet 6 XC9510 Series Synchronous Step-Down DC/DC Converter with Built-In LDO Regulator In Series plus Voltage Detector Preliminary ! TYPICAL APPLICATION CIRCUIT () SD 1 2 3 CIN 4 VDOUT AGND 5 PGND CE/ DCOUT MODE VDD LX 8 7 6 L CL1 DCOUT FOSC 1.2MHz 600kHz L 4.7H (CDRH4D28C, SUMIDA) 10H (CDRH4D28C, SUMIDA) 22H (CDRH4D28C, SUMIDA) VROUT VROUT CL2 300kHz CIN CL1 SOP-8 (TOP VIEW) CL2 : 4.7F (ceramic, TAIYO-YUDEN) : 10F (ceramic, TAIYO-YUDEN) : 1F (ceramic, TAIYO-YUDEN), VROUT>1.5V : 2.2F (ceramic, TAIYO-YUDEN), VROUT<1.5V ! OPERATIONAL EXPLANATION The XC9510 series consists of a synchronous step-down DC/DC converter, a high speed LDO voltage regulator, and a voltage detector. Since the LDO voltage regulator is stepped-down from the DC/DC's output, high efficiency and low noise is possible even at lower output voltages. $ DC/DC Converter The series consists of a reference voltage source, ramp wave circuit, error amplifier, PWM comparator, phase compensation circuit, output voltage adjustment resistors, driver transistor, synchronous switch, current limiter circuit, U.V.L.O. circuit and others. The series ICs compare, using the error amplifier, the voltage of the internal voltage reference source with the feedback voltage from the VOUT pin through split resistors. Phase compensation is performed on the resulting error amplifier output, to input a signal to the PWM comparator to determine the turn-on time during PWM operation. The PWM comparator compares, in terms of voltage level, the signal from the error amplifier with the ramp wave from the ramp wave circuit, and delivers the resulting output to the buffer driver circuit to cause the Lx pin to output a switching duty cycle. This process is continuously performed to ensure stable output voltage. The current feedback circuit monitors the P-channel MOS driver transistor current for each switching operation, and modulates the error amplifier output signal to provide multiple feedback signals. This enables a stable feedback loop even when a low ESR capacitor, such as a ceramic capacitor, is used, ensuring stable output voltage. < Reference Voltage Source > The reference voltage source provides the reference voltage to ensure stable output voltage of the DC/DC converter. < Ramp Wave Circuit > The ramp wave circuit determines switching frequency. The frequency is fixed internally and can be selected from 300kHz, 600 kHz and 1.2 MHz. Clock pulses generated in this circuit are used to produce ramp waveforms needed for PWM operation, and to synchronize all the internal circuits. < Error Amplifier > The error amplifier is designed to monitor output voltage. The amplifier compares the reference voltage with the feedback voltage divided by the internal split resistors. When a voltage lower than the reference voltage is fed back, the output voltage of the error amplifier increases. The gain and frequency characteristics of the error amplifier output are fixed internally to deliver an optimized signal to the mixer. < PWM/PFM > The XC9510A to F series are PWM control, while the XC9510H to L series can be automatically switched between PWM control and PWM/PFM control. The PWM mode of the XC9510A to F series are controlled on a specified frequency from light loads through the heavy loads. Since the frequency is specified, the composition of a noise filter etc. becomes easy. However, the efficiency at the time of the light load may become low. The XC9510H to L series can switch in any timing between PWM control and PWM/PFM automatic switching control. The series can not control only PFM mode. If needed, the operation can be set on a specified frequency; therefore, the control of the noise etc. is possible and the high efficiency at the time of the light load during PFM control mode is possible. With the automatic PWM/PFM switching control function, the series ICs are automatically switched from PWM control to PFM control mode under light load conditions. If during light load conditions the coil current becomes discontinuous and on-time rate falls lower than 30%, the PFM circuit operates to output a pulse with 30% of a fixed on-time rate from the Lx pin. During PFM operation with this fixed on-time rate, pulses are generated at different frequencies according to conditions of the moment. This causes a reduction in the number of switching operations per unit of time, resulting in efficiency improvement under light load conditions. However, since pulse output frequency is not constant, consideration should be given if a noise filter or the like is needed. Necessary conditions for switching to PFM operation depend on input voltage, load current, coil value and other factors. Semiconductor Ltd. Data Sheet 7 XC9510 Series Synchronous Step-Down DC/DC Converter with Built-In LDO Regulator In Series plus Voltage Detector Preliminary ! OPERATIONAL EXPLANATION (Continued) < Synchronous / Non-synchronous > The XC9510 series automatically switches synchronous / non synchronous according to the state of the DC/DC converter. In the series, highly efficient operation using the synchronous mode while the coil current is in a continuation state. The series enters non-synchronous operation when the built-in Nch switching transistor for synchronous operaion is shutdown which happens when the load current becomes low and the operation changes to a disconsinuous state. The IC can operate without an external schottky diode because the parasitic diode in the Nch switching transistor provides the circuit's stepdown operation. However, since Vf of the parasitic diode is high 0.6V, the efficiency level during non-synchronous operation shows a slight decrease. Please use an external schottky diode if high efficiency is required during light load current. $ Continuous Mode : Synchronous ILmax $ Discontinuous Mode : Non-Synchronous Coil Current ILmin Coil Current 0mA ILmax 0mA LX W ave Form LX W ave Form < Current Limit > The current limiter circuit of the XC9510 series monitors the current flowing through the P-channel MOS driver transistor connected to the Lx pin, and features a combination of the constant-current type current limit mode and the operation suspension mode. 1 When the driver current is greater than a specific level, the constant-current type current limit function operates to turn off the pulses from the Lx pin at any given timing. 2 When the driver transistor is turned off, the limiter circuit is then released from the current limit detection state. 3 At the next pulse, the driver transistor is turned on. However, the transistor is immediately turned off in the case of an over current state. 4 When the over current state is eliminated, the IC resumes its normal operation. The IC waits for the over current state to end by repeating the steps 1 through 3 . If an over current state continues for 8msec and the above three steps are repeatedly performed, the IC performs the function of latching the OFF state of the driver transistor, and goes into operation suspension mode. Once the IC is in suspension mode, operations can be resumed by either turning the IC off via the CE/MODE pin, or by restoring power to the VIN pin. The suspension mode does not mean a complete shutdown, but a state in which pulse output is suspended; therefore, the internal circuitry remains in operation. The constant-current type current limit of the XC9510 series can be set at 1.2A. Limit<8mS * Limit>8mS * Current Limit LEVEL IDOUT 0mA DCOUT VSS LX CE Restart VIN *1.2MHz, Typical Semiconductor Ltd. Data Sheet 8 XC9510 Series Synchronous Step-Down DC/DC Converter with Built-In LDO Regulator In Series plus Voltage Detector Preliminary ! OPERATIONAL EXPLANATION (Continued) < U.V.L.O. Circuit> When the VIN pin voltage becomes 1.4 V or lower, the P-channel output driver transistor is forced OFF to prevent false pulse output caused by unstable operation of the internal circuitry. When the VIN pin voltage becomes 1.8 V or higher, switching operation takes place. By releasing the U.V.L.O. function, the IC performs the soft start function to initiate output startup operation. The soft start function operates even when the VIN pin voltage falls momentarily below the U.V.L.O. operating voltage. The U.V.L.O. circuit does not cause a complete shutdown of the IC, but causes pulse output to be suspended; therefore, the internal circuitry remains in operation. $ High Speed LDO Voltage Regulator The voltage regulator block of the XC9510 series consists of a reference voltage source, error amplifier, and current limiter circuit. The voltage divided by split resistors is compared with the internal reference voltage by the error amplifier. The P-Channel MOSFET, which is connected to the VROUT pin, is then driven by the subsequent output signal. The output voltage at the VROUT pin is controlled and stabilized by a system of negative feedback. A stable output voltage is achievable even if used with low ESR capacitors as a phase compensation circuit is built-in. < Reference Voltage Source > The reference voltage source provides the reference voltage to ensure stable output voltage of the regulator. < Error Amplifier > The error amplifier compares the reference voltage with the signal from VROUT, and the amplifier controls the output of the Pch driver transistor. $ Detector The detector block of the XC9510 series detects output voltage from the VDOUT pin while sensing either VDD, DCOUT, or VROUT internally. (N channel Open Drain Type) Semiconductor Ltd. Data Sheet 9 |
Price & Availability of XC9510
 |
|
|
|
|
All Rights Reserved © IC-ON-LINE 2003 - 2022 |
| [Add Bookmark] [Contact Us] [Link exchange] [Privacy policy] |
|
Mirror Sites : [www.datasheet.hk]
[www.maxim4u.com] [www.ic-on-line.cn]
[www.ic-on-line.com] [www.ic-on-line.net]
[www.alldatasheet.com.cn]
[www.gdcy.com]
[www.gdcy.net] |