YB1200R 150mA High PSRR with Auto-Discharge LDO Regulator Description Features The YB1200R is a series of ultra-low-noise, low dropout (LDO) linear regulators with 2.0% output voltage accuracy. The YB1200R regulators achieve a low 180mV dropout at 150mA load current of 3.3V output and are available in voltages ranging from 1.2V to 3.6V with 0.1V per step (custom voltage is considerable at request). High Accuracy Output Voltage : + 2% The YB1200R regulators are optimized to work with low-ESR and low cost ceramic capacitors, reducing the amount of board space critical in portable devices. The YB1200R requires only 0.47μF output capacitor for stability with any load and consumes less than 1μA in shutdown mode. YB1200R also deploys an auto-discharge circuit which can de-energize the output capacitor to prevent the system from abnormal operation during shutdown. Built-in thermal shutdown and short-circuit protect offer secure protection against fault operation. The YB1200R regulators are available in SC-70 / SC-82 packages. Wide Output Voltage Range : 1.2 ~ 3.6V Ultra-Low-Noise Low-Drop-Out Typical Output Current : 150mA Low Quiescent Current : ~ 60μA 180mV Dropout at 150mA 3.3V Output Stable with 0.47μF Ceramic Capacitor Only Need Input and Output Capacitors Thermal Protection Shutdown Output Short-Circuit Current Limit Built-In Internal Soft-Start Built-In Auto-Discharge Function Green Package (RoHS) Available Applications PDA, Notebook, PC Computers DSC, Handset Camera Modules PCMCIA Cards, PC Cameras USB Based Portable Devices GSM/GPRS/3G RF Transceiver Wireless LANs Bluetooth Portable Radios Battery-Powered Devices Typical Application Circuit Figure 1-1: SC-70 Application Circuit YB1200R Rev.1.2 Figure 1-2: SC-82 Application Circuit www.yobon.com.tw 1 YB1200R 150mA High PSRR with Auto-Discharge LDO Regulator Pin Configuration Figure 2: Pin Configuration Pin Description Table 1 Name Description VIN Unregulated Input Supply. Bypass with a capacitor to GND. GND Ground Pin. EN BYPASS VOUT Pull high to enable the regulator. Connect a 33nF capacitor to GND for low noise operation. Regulated Output Voltage. Bypass with a capacitor to GND. YB1200R Rev.1.2 www.yobon.com.tw 2 YB1200R 150mA High PSRR with Auto-Discharge LDO Regulator Ordering Information Absolute Maximum Ratings Recommended Operating Conditions Supply Voltage............................ -0.3V to 7V Output Voltage ................ -0.3V to (VIN+0.3V) Output Short-Circuit Duration..............Infinite Junction Temperature Range.............+150℃ Storage Temperature Range........-65℃ to +150℃ Lead Temperature..............................+250℃ Thermal Resistance (SC-70/82, θJA)....... 330℃/W Internal Power Dissipation (SC-70/82, PD).....0.3W Input Supply Voltage..................... 2V to 6V Operating Temperature......... -40℃ to +85℃ ESD Susceptibility (HBM).................... 2KV ESD Susceptibility (MM).....................200V YB1200R Rev.1.2 www.yobon.com.tw 3 YB1200R 150mA High PSRR with Auto-Discharge LDO Regulator Electrical Characteristics Table 2 VIN = ( VOUT + 1V ), CIN = COUT = 0.47μF, VEN = VIN, TA=25°C, unless otherwise noted. Description Input Voltage Range Output Voltage Output Voltage Accuracy Output Current Limit Dropout Voltage (Note 1) Symbol VOUT ΔVOUT ISC VDROP IG Line Regulation ΔVLINE Load Regulation ΔVLOAD Ripple Rejection (PSRR) MAX Units 2.0 6.0 V Predefined 1.2 3.6 V IOUT = 10mA, VOUT ≧ 1.3V -2.0 +2.0 % 0 +4.0 % VIN Ground Current Shutdown Supply Current Test Conditions ISD PSRR Start Up Delay (Note 2) Shutdown Delay (Note 3) IOUT = 10mA, VOUT = 1.2V MIN TYP Short-Circuit Output 200 mA VOUT = 3.6V, IOUT = 150mA 150 VOUT = 3.0V, IOUT = 150mA 180 VOUT = 2.5V, IOUT = 150mA 250 VOUT = 1.5V, IOUT = 150mA 380 VOUT = 1.2V, IOUT = 150mA 510 Iground = IIN - IOUT VIN = (VOUT + 1V) to 6V, VOUT = 10mA IOUT = 1mA to 150mA 60 0.30 0.40 %/V 0.6 1.2 % EN = 0.4V 0.01 mV μA μA f = 1KHz, IOUT =1mA 50 f = 10KHz, IOUT =1mA 60 f = 100KHz, IOUT =1mA 40 Rload = 100 ohm, Cbypass = 0nF 20 50 μs Rload = 100 ohm, Cbypass = 33nF 2 3.5 ms Rload = 10K ohm, VOUT = 1.5V 1 Rload = 10K ohm, VOUT = 1.2V 1 dB ms EN Logic Low Level VIL VIN = 2.0V to 6.0V EN Logic High Level VIH VIN = 2.0V to 6.0V EN Input Bias Current IBEN VIN = EN = VOUT + 1V 0.01 μA Thermal Shutdown TSD Shutdown Temperature 160 °C Thermal Hysteresis THYS 20 °C 1.2 0.4 V VIN V Note : 1. The drop out voltage varies depending on output voltage selection. Dropout is defined as VIN – VOUT when VOUT is 100mV below VOUT where VIN = VOUT + 1V for nominal VOUT. 2. Time needed for VOUT to reach 90% of final value. 3. Time needed for VOUT to discharge below 0.5V. YB1200R Rev.1.2 www.yobon.com.tw 4 YB1200R 150mA High PSRR with Auto-Discharge LDO Regulator Typical Performance Characteristics VIN = ( VOUT + 1V ), CIN = COUT = 0.47μF, VEN = VIN, TA=25°C, unless otherwise noted. Dropout Voltage vs. Output Load Ground Current vs. Input Voltage Dropout Voltage vs. Temperature Dropout Voltage vs. Temperature Output Voltage vs. Temperature Output Voltage vs. Temperature YB1200R Rev.1.2 www.yobon.com.tw 5 YB1200R 150mA High PSRR with Auto-Discharge LDO Regulator Line Transient Response Load Transient Response Start Up Delay (Cbypass=0nF) Start Up Delay (Cbypass=33nF) Shutdown Delay (VOUT = 1.2V) Shutdown Delay (VOUT = 1.5V) YB1200R Rev.1.2 www.yobon.com.tw 6 YB1200R 150mA High PSRR with Auto-Discharge LDO Regulator PSRR vs. Frequency (1mA load) PSRR vs. Frequency (10mA load) YB1200R Rev.1.2 www.yobon.com.tw 7 YB1200R 150mA High PSRR with Auto-Discharge LDO Regulator Function Block Figure 3: Function Block Functional Description The YB1200R is an ultra-low-noise, low-quiescent current, low-dropout linear regulator. It is supplied in a extremely small SC-70 / SC82 package for different applications. YB1200R can supply loads up to 150mA (typical operation, not maximum) and output voltages are preset and ranging from 1.2V to 3.6V. As shown in the Functional Block Diagram, the YB1200R consists of a reference and noise bypass circuit, error amplifier, output drive transistor, internal feedback voltage divider, thermal sensor, and short circuit current limiter. The internal reference is connected to the error amplifier’s inverting input. The error amplifier compares this reference with the YB1200R Rev.1.2 feedback voltage and amplifies the difference. If the feedback voltage is lower than the reference voltage, the gate of the pass-transistor is pulled low. This allows more current to pass to the output and increases the output voltage. If the feedback voltage is too high, the gate of the pass transistor is pulled high, allowing less current to pass to the output. Stability The YB1200R is a high performance LDO emphasizing stability with low output capacitance. It is able to maintain stability with an output capacitor as low as 0.47μF. The output capacitor can also be increased to optimize performance. The YB1200R will remain stable and in regulation with no load, unlike many other voltage regulators. www.yobon.com.tw 8 YB1200R 150mA High PSRR with Auto-Discharge LDO Regulator Internal P-Channel Pass Transistor The YB1200R features a low impedance 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 YB1200R consumes only 60µA of quiescent current under most conditions. Output Short-Circuit Current Limit The YB1200R includes a current limiter, which monitors and controls the pass transistor’s gate voltage, limiting the output current to about 200mA, for example, in a short-circuit output situation. Shutdown The YB1200R also features a low-power active shutdown mode. It has a switch that turns off the device when disabled. This allows the output capacitor and load to discharge and de-energize the load. In the shutdown mode, the internal functional blocks, such as voltage reference and the error amplifier, are turned off completely, and the quiescent current is less than 1µA. 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 junction temperature drops to +140°C. Auto-Discharge Circuitry The YB1200R deploys a NMOS connecting YB1200R Rev.1.2 between VOUT and ground. When EN pin is pulled low, the NMOS is activated by an inverted signal from EN. The charge kept on output capacitor is discharged quickly through the NMOS. It prevents the system from abnormal operation at the beginning of shutdown mode. Soft-Start Circuitry The YB1200R 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 YB1200R 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 YB1200R 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. www.yobon.com.tw 9 YB1200R 150mA High PSRR with Auto-Discharge LDO Regulator Package Information (SC-70) YB1200R Rev.1.2 www.yobon.com.tw 10 YB1200R 150mA High PSRR with Auto-Discharge LDO Regulator Package Information (SC-82) NOTICE: y The information described herein is subject to change without notice. y Yobon does not assume any responsibility for use of any circuitry or applications described herein, nor does it convey any patent license. YB1200R Rev.1.2 www.yobon.com.tw 11