XC9122B091MR-G

XC9120/XC9121/XC9122 Series ETR04009-005b Step-Up DC/DC Controller IC, MAXDUTY: 93% ☆Green Operation Compatible ■GENERAL DESCRIPTION XC9120/XC9121/XC9122 Series are PWM, PWM/PFM auto/external switching controlled step-up DC/DC converter controller ICs. Since maximum duty ratio is as large as 93%, the series is the best for the applications used as high step-up ratios, such as the LCD panels and OLED. In this series, even if it is a high step-up ratio, the output voltage stabilized at high efficiency can be obtained. With 0.9V (±2.0%) of reference voltage supply internal, and using external resistors, RFB1 and RFB2, output voltage can be set up freely within a range of 1.5V to 30V. For a current sense, with the use of RSENSE, ceramic capacitors can be used as load capacitors and allows for lower output ripple and reduced PCB area requirements. Control automatically switches from PWM to PFM during light loads with the XC9121 series and the XC9122 series can switch the control from PWM to PFM using external signals depending on the circuit conditions. During stand-by (when the CE pin is low), all circuits are shutdown to reduce current consumption to as low as 1.0μA or less. ■APPLICATIONS ●Power Supply for the LCDs. ●Organic electroluminescence display (OELD) ■FEATURES Input Voltage Range : 0.9V ~ 6.0V Operating Voltage Range : 1.8V ~ 6.0V Output Voltage Range : 1.5V ~ 30V (externally set) Reference voltage 0.9V (±2.0%) Oscillation Frequency : 100kHz (±15%) Output Current : ≥80mA (VIN=3.6V, VOUT=15V)* Control : XC9120 (PWM) : XC9121 (PWM/PFM Automatic) : XC9122 (PWM/PFM Externally) : 85% (TYP.) High Efficiency : (VIN=3.6V, VOUT=15V, IOUT=10mA)* Stand-by Function : ISTB=1.0A (MAX.) Load Capacitors : Low ESR capacitor compatible Maximum Duty Cycle : 93% (TYP.) for High Step-up Ratio Packages : SOT-25, USP-6C * When using external components showing in the circuit below. ■TYPICAL PERFORMANCE CHARACTERISTICS XC9122D091 (100kHz, 15.0V) L=47uH(CDRH5D28),SD:XB01SB04A2 CL=40uF(Ceramic),Tr:161A11A1 100 4.2V Efficiency: EFFI(%) ■TYPICAL APPLICATION CIRCUIT PWM/PFM 80 VIN=2.7V 60 3.2V 3.6V PWM 40 20 0 0.1 1 10 100 Output Current: IOUT(mA) 1/16 XC9120/XC9121/XC9122 Series ■PIN CONFIGURATION EXT GND 55 44 * The dissipation pad for the USP-6C package should be solder-plated in recommended mount pattern and metal masking so as to enhance mounting strength and heat release. If the pad needs to be connected to other pins, it should be connected to the VDD pin (Pin #2). 1 22 33 FB VDD CE USP-6C (BOTTOM VIEW) SOT-25 (TOP VIEW) ■PIN ASSIGNMENT PIN NUMBER PIN NAME FUNCTION 6 FB Output Voltage Setting Resistor Connection 2 VDD Supply Voltage CE Chip Enable (Operates when "H" Level) CE (/PWM) PWM/PFM Switch* SOT-25 USP-6C 1 2 3 4 4 3 GND Ground 5 1 EXT External Transistor Drive Connection - 5 NC No Connection * The XC9122 series combines the CE pin and PWM/PFM switch pin. ■FUNCTION XC9120/9121 Series CE PIN H Operation L Shut-Down XC9122 Series CE/PWM PIN H More than VDD - 0.2V M 0.65 ~ VDD - 1.0V L 0 ~ 0.2V 2/16 IC OPERATIONAL STATE IC OPERATIONAL STATE Operation (PWM control) Operation (PWM/PFM automatic switching control Shut-Down XC9120/XC9121/XC9122 Series ■ PRODUCT CLASSIFICATION ●Ordering Information XC9120①②③④⑤⑥-⑦(*1): PWM Control XC9121①②③④⑤⑥-⑦(*1): PWM/PFM Automatic Switching Control XC9122①②③④⑤⑥-⑦(*1): PWM/PFM Externally Switching Control DESIGNATOR DESCRIPTION SYMBOL ① Type of DC/DC Controller D ② ③ Output Voltage 09 FB Voltage (ex. FB Voltage=0.9V→②=0, ③=9) ④ Oscillation Frequency 1 ⑤⑥-⑦ Packages (Oder Unit) MR-G 100kHz SOT-25 (3,000pcs/Reel) ER-G USP-6C (3,000pcs/Reel) (*1) DESCRIPTION No current limiter The “-G” suffix indicates that the products are Halogen and Antimony free as well as being fully EU RoHS compliant. ■ BLOCK DIAGRAM ■ ABSOLUTE MAXIMUM RATINGS Ta=25℃ PARAMETER SYMBOL VDD Pin Voltage VDD -0.3 ~ 12.0 V FB Pin Voltage VFB -0.3 ~ 12.0 V CE Pin Voltage VCE -0.3 ~ 12.0 V EXT Pin Voltage VEXT -0.3 ~ VDD + 0.3 V EXT Pin Current IEXT ±100 mA UNIT 250 SOT-25 Power Dissipation RATINGS Pd USP-6C 760 (JESD51-7 board) (*1) mW 120 1250 (JESD51-7 board) (*1) Operating Temperature Range Topr -40 ~ 85 ℃ Storage Temperature Range Tstg -55 ~ 125 ℃ (*1) The power dissipation figure shown is PCB mounted and is for reference only. Please refer to PACKAGING INFORMATION for the mounting condition. 3/16 XC9120/XC9121/XC9122 Series ■ELECTRICAL CHARACTERISTICS (fOSC=100kHz) PARAMETER SYMBOL CONDITIONS Ta=25℃ MIN. TYP. MAX. UNIT CIRCUIT FB Voltage VFB 0.882 0.900 0.918 V ④ Supply Voltage Range (*1) VDD 1.8 - 6.0 V ① Output Voltage Setting Range VOUTSET 1.5 - 30.0 V ② Operation Start Voltage VST1 - - 0.9 V ③ Oscillation Start Voltage (*1) VST2 - - 0.8 V ④ Operation Hold Voltage VHLD - - 0.7 V ③ Supply Voltage 1 IDD1 Same as VST2, VDD=3.0V - 25 50 μA ④ Supply Voltage 2 IDD2 Same as IDD1, FB=1.2V - 13 30 μA ④ Stand-by Current ISTB Same as IDD1, CE=0V - - 1.0 μA ⑤ Oscillation Frequency fOSC Same as IDD1 85 100 115 kHz ④ Maximum Duty Ratio MAXDTY Same as IDD1 89 93 96 % ④ PFM Duty Ratio PFMDTY No Load (XC9121D, XC9122D types) 24 32 40 % ⑥ Efficiency (*2) EFFI - 85 - % ① Soft-Start Time tSS 5.0 10.0 20.0 ms ① CE "H" Voltage VCEH Same as IDD1 0.65 - - V ⑤ CE "L" Voltage VCEL Same as IDD1 - - 0.20 V ⑤ EXT "H" ON Resistance REXTH Same as IDD1, VEXT=VOUT-0.4V - 24 36 Ω ④ EXT "L" ON Resistance REXTL Same as IDD1, VEXT=0.4V - 16 24 Ω ④ PWM ‘H’ Voltage (*3) VPWMH IOUT=1mA (XC9122D type) VDD-0.2 - - V ① PWM ‘L’ Voltage (*3) VPWML IOUT=1mA (XC9122D type) - - VDD-1.0 V ① CE "H" Current ICEH Same as IDD2, CE=VDD - - 0.1 μA ⑤ CE "L" Current ICEL Same as IDD2, CE=0V - - -0.1 μA ⑤ FB "H" Current IFBH Same as IDD2, FB=VDD - - 0.1 μA ⑤ FB "L" Current IFBL Same as IDD2, FB=0V - - -0.1 μA ⑤ Recommended circuit using 2SD1628, VIN=VOUTSET×0.6, VDD=3.0V, IOUT=1.0mA Recommended circuit using 2SD1628 VOUT=3.3V, IOUT=1.0mA No external components, CE connected to VDD, Voltage applied, FB=0V Recommended circuit using 2SD1628 VOUT=3.3V, IOUT=1.0mA IOUT=10mA Test Conditions: Unless otherwise stated, CL: ceramic, recommended MOSFET should be connected. When VOUT is set at 15V, VIN=VDD=3.6V. NOTE: *1: Although the IC starts step-up operations from a VDD=0.8V, the output voltage and oscillation frequency are stabilized at VDD>1.8V. Therefore, a VDD of more than 1.8V is recommended when VDD is supplied from VIN or other power sources. *2: EFFI: {(output voltage) x (output current)} / {(input voltage) x (input current)} x 100 *3: The XC9122 series’ CE pin combines PWM/PFM external switch pin. In the operation state, PWM control becomes effective when the CE pin is more than VDD-0.2V. When the CE pin is less than VDD-1.0V and more than VCEH, PWM/PFM automatic switching control becomes effective with 32% duty. 4/16 XC9120/XC9121/XC9122 Series ■ TYPICAL APPLICATION CIRCUIT SD RSENSE CFB VOUT RFB1 RFB2 1 CL 5 Nch Power MOS FET CIN VIN RB 2 3 4 CB CE NPM Tr When obtaining VDD from a source other than VIN (VOUT), please insert a by-pass capacitor CDD between the VDD pin and the GND pin in order to provide stable operations. Please place CL and CIN as close as to the VOUT and VDD pins respectively and also close to the GND pin. Strengthen the wiring sufficiently. RSENSE should be removed and shorted when the CL capacitor except for ceramic or low ESR capacitor is used. Insert RB and CB when using a bipolar NPN transistor. 5/16 XC9120/XC9121/XC9122 Series ■ OPERATIONAL EXPLANATION The XC9120/XC9121/XC9122 series consists of a reference voltage source, ramp wave circuit, error amplifier, PWM comparator, phase compensation circuit, and current limiter circuit. The series ICs compare, using the error amplifier, the voltage of the internal voltage reference source with the feedback voltage from the FB pin. 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 EXT pin to output a switching duty cycle. This process is continuously performed to ensure stable output voltage. Error amplifier is designed to monitor the output voltage, comparing the feedback voltage (FB) with the reference voltage Vref. In response to feedback of a voltage lower than the reference voltage Vref, the output voltage of the error amp. decreases. The circuit generates the internal reference clock. The frequency is set to 100kHz (TYP.). The ramp wave generator generates a saw-tooth waveform based on outputs from the OSC Generator. The PWM comparator compares outputs from the error amp. and saw-tooth waveform. When the voltage from the error amp’s output is low, the external switch will be set to ON. The circuit generates PFM pulses. The XC9122 series can switch PWM control and PWM/PFM switching control by external signal. The PWM/PFM automatic switching control becomes effective when the voltage of the CE pin is less than VDD-1.0V, and the control switches between PWM and PFM automatically depending on the load. The PWM/PFM control turns into the PFM control when threshold voltage becomes lower than voltage of error amps. The PWM control becomes effective when the CE pin voltage is more than VDD-0.2V. Noise is easily reduced with the PWM control since the switching frequency is fixed. Because of this, the series gives the best control suitable for your application. The reference voltage, Vref (FB pin voltage) =0.9V, is adjusted and fixed by laser trimming (for output voltage settings, please refer to the output voltage setting.). Soft-start circuit protects against inrush current, when the power is switched on, and also protects against voltage overshoot. It should be noted, however, that this circuit does not protect the load capacitor (CL) form inrush current. With the Vref voltage limited and depending on the input to the error amps, the operation maintains a balance between the two inputs of the error amps and controls the EXT pin’s ON time so that it does not increase more than is necessary. The function controls the operation and shutdown of the IC. When the voltage of the CE pin is 0.2V or less, the mode will be disable, the channel’s operations will stop and the EXT pin will be kept at a low level (the external N-ch MOSFET will be OFF). When the IC is in a state of disable, current consumption will be no more than 1.0μA. When the CE pin’s voltage is 0.65V or more, the mode will be enabled and operations will recommence. 6/16 XC9120/XC9121/XC9122 Series ■ OPERATIONAL EXPLANATION (Continued) 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 2MΩ. VOUT = 0.9 x (RFB1 + RFB2) / RFB2 The value of CFB, speed-up capacitor for phase compensation, should result in fzfb = 1/(2×π×CFB×RFB1) equal to 15kHz. Adjustments are required between 5kHz to 30kHz depending on the application, value of inductance (L), and value of load capacitance (CL). ex.) Output Voltage Setting VOUT RFB1 RFB2 (V) (kΩ) (kΩ) 390 12 30.0 270 10 25.0 470 22 20.0 510 27 18.0 CFB (pF) 27 39 22 18 VOUT (V) 15.0 10.0 7.0 3.3 RFB1 (kΩ) 470 150 150 150 RFB2 (kΩ) 30 15 22 56 CFB (pF) 22 68 68 68 The circuit of the XC9120 series is organized by a specialized circuit, which reenacts negative feedback of both voltage and current. Also by insertion of approximately 50mΩ of a low and inexpensive sense resistor as current sense, a high degree of stability is possible even using a ceramic capacitor, a condition which used to be difficult to achieve. Compared to a tantalum condenser, because the series can be operated in a very small capacity, it is suited to use of the ceramic capacitor, which is cheap and small. Tr SD L, CL L CL RSENSE CL L CL RSENSE : *When a MOSFET is used XP161A1355PR (N-Channel Power MOSFET, TOREX) Note: As the breakdown voltage of XP161A1355PR is 20V, take care with the output voltage. With output voltages over 17V, use the XP161A11A1PR with a breakdown voltage of 30V. VST1: XP161A1355PR=1.2V (MAX.) XP161A11A1PR=2.5V (MAX.) : XBS104S14R-G (Schottky Barrier Diode, TOREX) :Please set up as follows according to an operating condition or external components. : 47μH (CDRH5D28, SUMIDA) : 22μH (CDRH5D28, SUMIDA) : 25V, 10μF (Ceramic type, TMK316BJ106KL, TAIYO YUDEN) : 10V, 10μF (Ceramic type, LMK325BJ106ML, TAIYO YUDEN) Use the formula below when step-up ratio and output current is large. CL = (CL standard value) x (IOUT (mA) / 100mA x VOUT / VIN) : 50mΩ (fOSC = 100kHz) *When a NPN Transistor is used: 2SD1628 (ON Semiconductor) RB : 500Ω (Adjust with Tr’s HSE or load) CB : 2200pF (Ceramic type) CB