Driver Transistor Built-In Synchronous Step-Down DC/DC Controller Ics Input Voltage : 25V XC9213 Series Preliminary May 20, 2003 Ver. 1 ! ! ! ! ! ! ! ! " APPLICATIONS Synchronous, Bootstrap Nch-Nch Drive Input Voltage Range : 2.5V ~ 25.0V Switching Frequency : 300kHz (±15%) PWM/PFM Manual Switching Control Overcurrent Protection Circuit Built-In High Efficiency : 93% (TYP.) TSSOP-16 Package Ceramic Capacitor Compatible # PDAs # Mobile Phones # Note book computers # Portable Audio Systems # Various Multi-function Power Supplies " FEATURES " GENERAL DESCRIPTION XC9213 series is Nch-Nch drive, synchronous, step-down DC/DC controller ICs with a built-in bootstrap driver circuit. Output will be stable no matter which load capacitors, including a low ESR capacitor, are used. Resistance (RSENSE) of about 100mΩ will be required as a current sense. The phase compensation is also run when a low ESR capacitor is used. In addition, the circuit is double protected by the ways of limiting the current while detecting overshoot current and making output shutdown at any given timing by a protection time setting capacitor (CPRO). The output voltage can be set freely within a range of 1.5V~15.0V with 1.0V (accuracy ±1.5%) of internal reference voltage by using externally connected resistors (RFB1, 2). Synchronous rectification PWM control can be switched to non-synchronous 30mV current limit PFM/PWM automatic switchable control (= voltage between RSENSE pins) by using the MODE pin. The series has a built-in voltage detector for monitoring a selected voltage by external resistors. During stand-by (CE pin = low) all circuits are shutdown to reduce current consumption to as low as 3.0µA or less. Input Voltage Range : 2.5V ~ 25.0V Output Voltage Range : 1.5V ~ 15.0V externally set Oscillation Frequency : 300kHz (±15%) Output Current : More than 5A (VIN=5.0V, VOUT=3.3V) Control : PWM/PFM manual-switching control. Current Limiter, Protection : Current limit operates at voltage Reference voltage : 1.0V (±1.5%) sense 150mV. Shutdown time can be adjusted by CPRO. High Efficiency : 93% (TYP., PWM mode @ VIN=5.0V, Detect Voltage Function : Detects 0.9V / Open-drain output Stand-by Current : ISTB = 3.0µA (MAX.) Load Capacitor : Low ESR (ceramic, etc.) Package : TSSOP-16 VOUT = 3.3V, 1A) capacitor compatible " TYPICAL APPLICATION CIRCUIT " TYPICAL PERFORMANCE CHARACTERISTICS XC9213B103V (FOSC:300kHz,3.0V) VIN : 5.0V, Tr1,Tr2: IRF7313, L : 6.1uH (CDRH127-6H1), Cout : 150uF (OS) S D2 100 VIN V Dou t CIN CB ST N1 L VOUT CFB XC9213 ( VL CV L CS S RFB 1 CL FB CSS CPRO CP RO AGND M ODE ) S D1 CE EXT2 PGND N2 RFB 2 Efficiency EFFI (%) V Di n RS ENS E VIN VS E NS E BST EXT1 VDi n Lx V Do ut 80 60 40 PWM Synchronous Rectification PWM / PFM Non Synchronous Rectification 20 0 0.01 1 0.1 1 Output Current IOUT (A) 10 Driver Transistor Built-In Synchronous Step-Down DC/DC Controller Ics Input Voltage : 25V XC9213 Series Preliminary " PIN CONFIGURATION 16 15 14 13 12 11 10 9 1 2 3 4 5 6 7 8 TSSOP-16 (TOP VIEW) " PIN ASSIGNMENT PIN NUMBER PIN NAME FUNCTION 1 VIN Input Voltage 2 VSENSE Current Detection 3 VL Local Power Supply 4 CE Chip Enable 5 AGND Analog Ground 6 MODE PWM / PFM Switch 7 CPRO Protection Time Setting Capacitor Connection <Set shutdown time of VOUT when detecting overcurrent> 8 CSS Soft-start Capacitor Connection <Set soft-start time> 9 VDIN Voltage Detector Input (0.9V) 10 FB Output Voltage Setting Resistor Connection < Set output voltage freely by split resistors > 11 VDOUT Voltage Detector Output (Open-Drain) 12 PGND Power Ground 13 EXT2 Low Side Nch Driver Transistor <Connect to Gate of Low Side Nch MOSFET > 14 LX Coil Connection 15 EXT1 High Side Nch Driver Transistor <Connect to Gate of High Side Nch MOSFET > 16 BST Bootstrap " SELECTION GUIDE # ORDERING INFORMATION XC9213B 1 SYMBOL 2345 PART NO. DESCRIPTION Reference Voltage 1, 2 10 3 3 4 V 5 R Device Orientation : Embossed Tape, Standard Feed L Device Orientation : Embossed Tape, Reverse Feed Fixed Oscillation Frequency : 300kHz Package Types : TSSOP-16 2 Driver Transistor Built-In Synchronous Step-Down DC/DC Controller Ics Input Voltage : 25V XC9213 Series Preliminary " BLOCK DIAGRAM CE Control Logic CE VIN Internal Blocks Latch Protection Circuit CPRO Current Limit & Current Feedback Short Protection UVLO Comparator Circuit FB + VDIN VDOUT BST UVLO EXT1 Phase Compensation Voltage Detector - CSS VSENSE Vref with Soft Start PWM Comparator + + Ramp Error Amp. Generator Buffer Driver + LX - EXT2 - VL Voltage Regulator + MODE PGND Mode Control Logic AGND " ABSOLUTE MAXIMUM RATINGS PARAMETER SYMBOL RATINGS UNITS VIN pin voltage VIN - 0.3 ~ 30.0 V VSENSE pin voltage VSENSE - 0.3 ~ 30.0 V VL pin voltage VL - 0.3 ~ 6.0 V CE pin voltage CE - 0.3 ~ 30.0 V MODE pin voltage MODE - 0.3 ~ 30.0 V CPRO pin voltage CPRO - 0.3 ~ 6.0 V CSS pin voltage CSS - 0.3 ~ 6.0 V VDIN pin voltage VDIN - 0.3 ~ 6.0 V FB pin voltage FB - 0.3 ~ 6.0 V VDOUT pin voltage VDOUT - 0.3 ~ 30.0 V EXT2 pin voltage EXT2 - 0.3 ~ 6.0 V Lx pin voltage Lx - 0.3 ~ 30.0 V EXT1 pin voltage EXT1 - 0.3 ~ 30.0 V BST pin voltage BST - 0.3 ~ 30.0 V Power Dissipation Pd 350 Operational Ambient Temperature Topr - 40 ~ + 85 mW O C Storage Temperature Tstg - 55 ~ + 125 3 C O Driver Transistor Built-In Synchronous Step-Down DC/DC Controller Ics Input Voltage : 25V XC9213 Series Preliminary " ELECTRICAL CHARACTERISTICS XC9213B103 (FOSC = 300kHz) Ta=25OC PARAMETER Input Voltage Output Voltage Setting Range FB Control Voltage UVLO Voltage Supply Current 1 Supply Current 2 Stand-by Current Oscillation Frequency Max. Duty Ratio 1 Max. Duty Ratio 2 PFM Duty Ratio SENSE Voltage CPRO time Soft-Start Time Efficiency SYMBOL VIN VOUTSET VFB UVLO IDD1 IDD2 ISTB FOSC MAXDTY1 MAXDTY2 PFMDTY VSENSE TPRO TSS EFFI CE "H" Voltage VCEH CE "L" Voltage VCEL MODE "H" Voltage MODE "L" Voltage EXT1 "H" Resistance EXT1 "L" ON Resistance EXT2 "H" ON Resistance EXT2 "L" ON Resistance CE "H" Current CE "L" Current MODE "H" Current MODE "L" Current CSS "H" Current CSS "L" Current FB "H" Current FB "L" Current VPWMH VPWML REXT1H REXT1L REXT2H REXT2L ICEH ICEL IMODEH IMODEL ICSSH ICSSL IFBH IFBL CPRO=100pF CSS=100pF, VOUT x 0.95, CE=0V ! 3V IOUT=1A No external components, FB=0V, Voltage which EXT pin starts oscillation No external components, FB=0V, Voltage which EXT pin voltage holding "L" level No load No load FB=0.9V, EXT1=3.6V FB=1.1V, EXT2=0.4V FB=1.1V, EXT1=3.6V FB=0.9V, EXT2=0.4V CE=5.0V CE=0V MODE=5.0V MODE=0V CSS=3.8V CSS=0V FB=5.0V FB=1.1V SYMBOL VLOUT " VOUT " VOUT " VIN x VOUT SYMBOL VDF VHYS VDIOUT tDLY IVDINH IVDINL IVDOUTH IVDOUTL $ Regulator PARAMETER Output Voltage Load Stability Input Stability $ Detector PARAMETER Detect Voltage Hysteresis Range VD Input Current Delay Time VDIN "H" Current VDIN "L" Current VDOUT " H" Current VDOUT " L" Current CONDITIONS MIN. 2.5 1.5 255 - TYP. 1.0 1.5 550 450 300 95 98 2 150 100 300 93 MAX. 25.0 15.0 3.0 345 - UNIT V V V V µA µA µA kHz % % µS mV µS µS % 1.4 - - V - 0.5 V 1.4 - 18 10 18 3 -0.7 -2.0 - 0.5 0.1 -0.1 0.1 -0.1 0.1 -0.1 V V Ω Ω Ω Ω µA µA µA µA µA µA µA µA CONDITIONS IOUT=10mA 1mA≤IOUT≤30mA IOUT=10mA VOUTVL + 1.0V≤VIN≤25.0V MIN. - TYP. 4.0 100 MAX. - UNIT V mV - 0.2 - %/V CONDITIONS MIN. - TYP. 0.9 6 15 - MAX. 0.1 0.1 -0.1 -0.1 -0.1 UNIT V % mV mS µA µA µA µA Voltage which EXT1 pin starts oscillation No external components, CE=VIN, FB=0.9V No external components, CE=VIN, FB=1.1V No external components, CE=FB=0V Same as IDD1 Same as IDD1 Same as IDD2 MODE=0V, IOUT=1mA, No RSENSE VDOUT=0.5V VDR ! VOUT inversion VDIN=5.0V VDIN=0V VDOUT=5.0V VDOUT=0V Test conditions : Unless otherwise stated, VOUT = 3.0V, VIN = 5.0V, CE = 5.0V, MODE = 5.0V Test circuits : Tr 1 : Tr 2 : 2SK2857 (NEC) 2SK2857 (NEC) CFB : 68pF RSENSE : 0Ω CL : 22µF (OS-CON) CPRO : 0F CIN : 22µF (OS-CON) CSS : 100pF SD 1 : CRS02 (Schottky barrier diode) CVL : 1µF RFB 1 : 200kΩ CBST : 0.1µF RFB 2 : 110kΩ 4 Driver Transistor Built-In Synchronous Step-Down DC/DC Controller Ics Input Voltage : 25V XC9213 Series Preliminary " EXTERNAL COMPONENTS <Setting of Output Voltage> Output voltage can be set by adding external split resistors. Output voltage is determined by the following equation, based on the values of RFB1 and RFB2. The sum of RFB1 and RFB2 should normally be 2 MΩ or less. VOUT = RFB1 / RFB2 + 1 The value of CFB1, speed-up capacitor for phase compensation, should be fzfb= 1 / (2 × π × CFB × RFB1) which is equal to 10kHz. Adjustments are required from 1kHz to 50kHz depending on the application, value of inductance (L), and value of load capacity (CL). [ Example of Equation ] VOUT = 3.0V RFB1 = 200kΩ, RFB2 = 110kΩ, CFB = 68pF VOUT = 220k / 110k + 1 =3.0V fzfb = 1 / (2 x π x 68p x 220k ) = 10.64kHz <External Components> Tr 1, Tr 2 $ IOUT = 2 ~ 3A IRF7313 (Nch x 2) (IR, SO-8) $ IOUT = ~10A SUP70N03-09 (Vishay, TO-220AB) SUB70N03-09 (Vishay, TO-263) L: 6.8µF (CDH127-6H1, SUMIDA) SD 1 : CMS02 (Schottky barrier diode, TOSHIBA) SD 2 : CRS02 (Schottky barrier diode, TOSHIBA) * Please select SD2 with low reverse current. RSENSE : Current Limit Value = 150mV / RSENSE ex.) When RSENSE = 30mΩ, CPRO : TPRO = CPRO x 1e6 ex.) When CPRO = 100pF TPRO = 100e -12 x 1e6 =100µS CSS= TSS = CSS x 3e6 ex.) When CSS = 3300pF, CBST : 0.1µF ~ 1µF TPRO = 3300e - 12 x 3e6 = 9.9mS * Please adjust according to CVL : 1µF CIN : 22µF (OS-CON, SANYO) CL : 150µF (OS-CON, SANYO) Current Limit = 150mV / 30mΩ = about 5A reverse current characteristics of SD2. 5