YB1220 Dual Channel 200mA LDO Regulator Description Features The YB1220 family is a dual-channel LDO product consisting of 2 independent low noise, low dropout (LDO), linear regulators especially designed for battery-powered equipment and portable device. The regulator achieves a low 300 mV dropout at 200mA 3.3V output and good PSRR of near 50dB at 1K~10KHz frequency. The YB1220 consumes only 80uA supply current with both regulators enabled and supports different output voltages of full range from 1.2 to 3.6V (pre-set). The YB1220 is smartly designed to fit in three different pin allocations of SOT23-6 package which offers higher flexibility to users’ PCB layout. Other features of YB1220 include a thermal shutdown circuit and an output short-circuit protection. • • • • • • • • • • • • High Accuracy Output Voltage : + 2% Wide Output Voltage Range : 1.2~3.6V Each Channel Typical Current : 200mA Max. Allowable 300mA Each Channel Low Quiescent Current : ~80uA Dual Enable Pins Control 300mV Dropout at 200mA 3.3V Output Stable with 1.0uF Ceramic Capacitor Thermal Protection Shutdown Output Short-Circuit Current Limit Built-In Internal Soft-Start Green Package (RoHS) Available Applications • • • • • • • Cellular Phone White LED Backlighting PDA, Notebook, PC Digital Camera Portable Application Wireless LAN Battery-Powered Equipment Typical Application Circuitry YB1220 MRev.1.1 www.yobon.com.tw 1 YB1220 Dual Channel 200mA LDO Regulator Pin Configuration Pin Description Table 1 Pin Name 1 EN1 2 SOT-26M Description Pin Name SOT-26R Description Pull High to Enable Output VO1 1 VO1 Regulated Output Voltage 1 GND Ground Pin 2 GND Ground Pin 3 EN2 Pull High to Enable Output VO2 3 EN1 Pull High to Enable Output VO1 4 VO2 Regulated Output Voltage 2 4 EN2 Pull High to Enable Output VO2 5 VIN Unregulated Input Supply 5 VIN Unregulated Input Supply 6 VO1 Regulated Output Voltage 1 6 VO2 Regulated Output Voltage 2 Pin Name 1 EN1 Pull High to Enable Output VO1 2 VIN Unregulated Input Supply 3 EN2 Pull High to Enable Output VO2 4 VO2 Regulated Output Voltage 2 5 GND Ground Pin 6 VO1 Regulated Output Voltage 1 YB1220 MRev.1.1 SOT-26T Description www.yobon.com.tw 2 YB1220 Dual Channel 200mA LDO Regulator Ordering Information Marking Information Absolute Maximum Ratings Recommended Operating Conditions Supply Voltage ................................................ -0.3V to 7.0V Junction Temperature Range ...................................+150℃ Input Supply Voltage........................ 2V to 6.0V Operating Temperature ..............-40℃ to +85℃ ESD Susceptibility (HBM)...........................................2KV Storage Temperature Range..................... -65℃ to +150℃ ESD Susceptibility (MM)........................................... 200V Output Voltage ....................................... -0.3V to (VIN+0.3V) Output Short-Circuit Duration.....................................Infinite Lead Temperature ....................................................+250℃ Thermal Resistance (SOT-26, θJC) ....................140℃/W Thermal Resistance (SOT-26, θJA) ....................250℃/W Internal Power Dissipation (SOT-26, PD).................. 0.4W YB1220 MRev.1.1 www.yobon.com.tw 3 YB1220 Dual Channel 200mA LDO Regulator Electrical Characteristics Table 2 TA = 25℃, VIN= Max(VO1,VO2) + 1 V , CIN = COU T1= Cout2=1.0μF, EN = VIN, unless otherwise noted Function Parameter Conditions Max Units 2.0 6.0 V Predefined 1.2 3.6 V IOUT = 10mA, VO >= 1.3V -2.0 +2.0 % IOUT = 10mA, VO = 1.2V 0 +4.0 % Input Voltage Range Output Voltage Output Voltage Accuracy Output Current Limit Min Typ Short-Circuit Output Limit 80 VOUT = 3.3V, IOUT = 200mA 300 VOUT = 2.8V, IOUT = 200mA 380 VOUT = 2.5V, IOUT = 200mA 420 VOUT = 1.8V, IOUT = 200mA 550 VOUT = 1.2V, IOUT = 200mA 800 Ground Current Iout = 0mA 80 μA Line Regulation VIN = Max(VO1,VO2)+1V to 6V, Iout =10mA 0.4 %/V Load Regulation Iout = 1mA to 200mA 1.0 % Shutdown Supply Current EN1 = EN2 = 0V ~0.01 μA F = 1KHz, Iout = 1mA 62 dB F = 10KHz, Iout = 1mA 50 dB F = 100KHz, Iout = 1mA 34 dB Dropout Voltage (Note 1) Ripple Rejection (PSRR) mA mV EN Logic Low Level VIN = 2.0V to 6V 0.4 EN Logic High Level VIN = 2.0V to 6V EN Input Bias Current VIN = EN = 6V 0.01 μA Thermal Shutdown Shutdown Temperature 160 ℃ 20 ℃ 1.5 Thermal Hysteresis V V Note 1 : The drop out voltage varies depending on output voltage selection Dropout is defined as VIN–VO when VO is 100mV below VO where VIN=Max(VO1,VO2) for nominal VO. Note 2: Time needed for VOUT to reach 90% of final value. YB1220 MRev.1.1 www.yobon.com.tw 4 YB1220 Dual Channel 200mA LDO Regulator Typical Characteristics At TA=25℃, VIN=Max(VO1,VO2) +1V, CIN=COUT=1.0μF, EN=VIN, unless otherwise noted. YB1220 MRev.1.1 www.yobon.com.tw 5 YB1220 Dual Channel 200mA LDO Regulator ILoad=80mA YB1220 MRev.1.1 www.yobon.com.tw 6 YB1220 Dual Channel 200mA LDO Regulator Functional Block Diagram Functional Description The YB1220 consists of two low-noise, low-quiescent current, low-dropout linear regulators and is supplied in a small SOT-26 package suitable for portable and battery-powered applications. Each channel can independently supply loads up to 200mA (typical operation, not maximum) and output voltages are preset and ranging from 1.2V to 3.6V. difference. If the feedback voltage is lower than the reference voltage, the gate of pass-transistor is pulled low, allowing more current to pass to the output and increasing the output voltage. If the feedback voltage is too high, the gate of pass transistor is pulled high, resulting in less current to the output. As shown in the Functional Block Diagram, the YB1220 consists of a single reference generating circuit, two error amplifiers, two P-channel pass transistors, independent internal feedback voltage dividers, two short circuit current limiters and one thermal shutdown protection circuit. The YB1220 is a high performance LDO emphasizing stability with low output capacitance. It is able to maintain stability with an output capacitor as low as 1.0uF. The output capacitor can also be increased to optimize performance. The YB1220 will remain stable and in regulation with no load, unlike many other voltage regulators. The internal reference is connected to the error amplifier’s inverting input. The error amplifier compares this reference with the feedback voltage and amplifies the YB1220 MRev.1.1 Stability Internal P-Channel Pass Transistor The YB1220 features a low impedance www.yobon.com.tw 7 YB1220 Dual Channel 200mA LDO Regulator P-channel MOSFET pass transistor. This provides several advantages over similar designs using a PNP pass transistor, including low operating power and longer battery life. The YB1220 consumes only 90µA around of quiescent current under most conditions. Output Short-Circuit Current Limit The YB1220 includes two current limiters, which monitor and control the pass transistor’s gate voltage, limiting the output current to about 80mA, for example, in a short-circuit output situation. Shutdown The YB1220 also features a low-power shutdown mode. It consists of independent switches to turn off different channel. The two LDOs are allowed to work in both active, only one active or both disabled to keep the lowest current consumption. In the both shutdown mode, the internal functional blocks, such as voltage reference and the error amplifiers, are turned off completely, and the quiescent current is less than 1µA. In the single shutdown mode, the reference circuit and the active side error amplifier remain functional whereas the disabled error amplifier gets into shutdown mode. Thermal Protection Shutdown The thermal protection shutdown function protects the device from operating in over temperature condition. When the junction temperature exceeds +160°C, the thermal sensor signals the shutdown logic, turning off the pass transistor and allowing the IC to cool down. The thermal sensor turns the pass transistor on again after the IC’s YB1220 MRev.1.1 junction temperature drops to +140°C. Soft-Start Circuitry The YB1220 includes a soft-start circuitry to limit inrush current at turn-on. During power up, the output capacitor and output load are charged with a reduced output current. Shortly after the initial power up, the soft-start feature is terminated and normal operation is resumed. Application Information Enable/Shutdown The YB1220 comes with an active-high enable pin that allows the regulator to be enabled. Forcing the enable pin low disables the regulator and puts it into the shutdown mode. This pin cannot be left floating as it may cause an undetermined state. Input/Output Capacitor It is recommended to use a 1.0µF capacitor on the YB1220 input and a 1.0µF capacitor on the output. For high regulation performance, larger input capacitor values and lower ESRs provide better noise rejection and line-transient response. The output noise, load-transient response, stability, and power-supply rejection can be improved by using large output capacitors. Low ESR ceramic capacitors provide optimal performance and save space. Transient Response The transient response can be improved by increasing the values of the input and output bypass capacitors, and through passive filtering techniques. www.yobon.com.tw 8 YB1220 Dual Channel 200mA LDO Regulator SOT-26 Package Information YB1220 MRev.1.1 www.yobon.com.tw 9