YB1253 300mA, Low Power, High PSRR LDO Regulator Description Features The YB1253 is a series of ultra-low-noise, high PSRR, and low quiescent current low dropout (LDO) linear regulators with 2.0% output voltage accuracy. The YB1253 regulators achieve a low 300mA dropout at 300mA load current of 3.6V output and are available in voltages ranging from 1.2V to 3.6V with 0.1 V per step (custom voltage is considerate at request). • • • • • • • • • • • The YB1253 regulators are optimized to work with low-ESR and low cost ceramic capacitors, reducing the amount of board space critical in portable devices. The YB1253 requires only 1.0μF output capacitor for stability with any load and consumes less than 1μA in shutdown mode. Built-in thermal shutdown and short-circuit current limit offer secure protection against fault operation. YB1253 regulators also include an auto-discharge function. The YB1253 regulators are available in SOT-23 / SOT-25 / SOT-89 packages. High Accuracy Output Voltage : + 2% Wide Output Voltage Range : 1.2~3.6V Ultra-Low-Noise Low-Drop-Out Typical Output Current : 300 mA Low Quiescent Current: ~10μA 300mV Dropout at 300mA 3.6V Output Stable with 1.0μF Ceramic Capacitor Only Need Input and Output Capacitors Thermal Protection Shutdown Auto discharge function Green Package (RoHS) Available Applications • • • • • • • • PDA, Notebook, PC Computers DSC, Cellular phones PCMCIA Cards, PC Cameras USB Based Portable Devices GSM/GPRS/3G RF Transceiver Wireless LANs Bluetooth Portable Radios Battery-Powered Devices Typical Application Circuitry Input Input VIN VOUT Cin=1uF ON OFF YB1253 Output Cin=1uF VIN VOUT YB1253 Output Cout=1uF Cout=1uF EN GND GND Figure 1-2 : SOT-23 application circuit Figure 1-1 : SOT-25 application circuit YB1253 Rev. 1.5 www.yobon.com.tw 1 YB1253 300mA, Low Power, High PSRR LDO Regulator Pin Configuration SOT-89 1 GND SOT-89R 2 3 VIN VOUT 1 2 VOUT GND VIN VOUT NC 3 5 4 SOT-25 SOT-23 3 VIN 1 GND 2 VOUT 1 VIN 2 3 GND EN Figure 2 : pin configuration Pin Description Table 1 Pin Name Pin Function VIN Unregulated Input Supply. Bypass with a capacitor to GND GND Ground pin EN Pull high to enable the regulator NC No connection is required VOUT Regulated Output Voltage YB1253 Rev. 1.5 www.yobon.com.tw 2 YB1253 300mA, Low Power, High PSRR LDO Regulator Ordering Information Y B 1253 X O utput V o ltage 120 : 1.2 V 130 : 1.3 V : 360 : 3.6 V X : fixed *O rder exam ple : Y B 12 53 S T 89X 250 fo r Y B 1253 of 2.5V output and S O T-89 package *S hipping Q uantity : S O T -23 : 3 000 units tape & reel S O T -25 : 3 000 units tape & reel S O T -89 : 1 000 units tape & reel S O T -89R : 1000 units tape & reel *O nly gre en packag e P ackage T ype S T 23 : S O T -23 S T 25 : S O T -25 S T 89 : S O T -89 S T 8R : S O T -89R Marking Information Absolute Maximum Ratings (Note 1) Recommended Operating Conditions (Note 2) Supply Voltage ................................-0.3V to 6.0V Input Supply Voltage.........................2V to 5.5V Output Voltage .......................-0.3V to (VIN+0.3V) Operating Temperature..............-40℃ to +85℃ Output Short-Circuit Duration.................... Infinite Junction Temperature Range ................... +150℃ Storage Temperature Range...... -65℃ to +150℃ Lead Temperature.................................... +250℃ ESD Susceptibility (HBM)…………… ………2KV ESD Susceptibility (MM) ............................. 200V Thermal Information (Note 3) Thermal Resistance (SOT-23/25, θJA).280℃/W Thermal Resistance (SOT-89, θJA)…...180℃/W Internal Power Dissipation (SOT-23/25, PD)……0.4W Internal Power Dissipation (SOT-89, PD)0.55W Note: 1. Exceeding these ratings may damage the device. 2. The device is not guaranteed to function outside of its operating conditions. 3. θJA is measured in free air at TA = 25℃ on a low effective thermal conductivity board. YB1253 Rev. 1.5 www.yobon.com.tw 3 YB1253 300mA, Low Power, High PSRR LDO Regulator Electrical Characteristics Table 2 TA = 25℃, VIN = ( VOUT + 1 V ), CIN = COU T = 1.0μF, VEN = VIN, unless otherwise t d Function Parameter Conditions Max Units 2.0 5.5 V Predefined 1.2 3.6 V IOUT = 10mA, VOUT >= 1.3V -2.0 +2.0 % IOUT = 10mA, VOUT = 1.2V 0 +4.0 % Input Voltage Range Output Voltage, VOUT Output Voltage Accuracy Output Current Limit Min Typ Short-circuit output 500 Vout = 3.6V, Iout = 300 mA 300 Vout = 3.3V, Iout = 300 mA 350 Vout = 2.8V, Iout = 300 mA 430 Vout = 1.8V, Iout = 300 mA 600 Vout = 1.2V, Iout = 300 mA 900 Ground Current Iground = Iin - Iout 10 Line Regulation Vin = (Vout+1V) to 5.5V, Iout =10mA 0.10 0.20 %/V Load Regulation Iout = 1mA to 300 mA 0.005 0.01 %/mA Shutdown Supply Current EN = Vin=0V 1 μA Ripple Rejection (PSRR) (Note 2) Start Up Delay (Note 3) Rload=100ohm Dropout Voltage (Note 1) Shutdown Delay mA mV μA 50 dB 200 μS Rload=10K ohm, VOUT=1.5V 1 mS Rload=10K ohm, VOUT=1.2V 1 mS EN Logic Low Level Vin = 2.0V to 5.5V EN Logic High Level Vin = 2.0V to 5.5V EN Input Bias Current Vin = EN = 3V 1.5 μA Thermal Shutdown Shutdown Temperature 160 °C 20 °C Thermal Hysteresis 1.2 0.4 V Vin V Note 1: The dropout voltage varies depending on output voltage selection. Dropout is defined as VIN–VOUT when VOUT is 100mV below nominal VOUT where Vin=Vout + 1V for nominal VOUT. Note 2: PSRR is tested at Vin=3.8+1Vppac, Vout=2.8V, I_load=1mA. Note 3: Time needed for VOUT to reach 90% of final value. YB1253 Rev. 1.5 www.yobon.com.tw 4 YB1253 300mA, Low Power, High PSRR LDO Regulator Typical Characteristics At TA=25℃, VIN=(VOUT+1V), CIN=COUT=1.0μF, VEN=VIN, unless otherwise noted. Output Curent VS Dropout voltage Input voltage VS Quiescent current 1000 45 40 Iout= 300mA 800 700 Quiescent current (uA) Dropout Voltage (mV) 900 1.3V 600 500 1.8V 400 300 3.3V 35 25 3.3V 20 1.8V 15 200 10 100 5 0 Iout= 0 30 0 0 50 100 150 200 250 300 350 2 2.5 3 3.5 Output current (mA) Output voltage VS Temperature 3.5 5 5.5 3.5 3.3V 3 Iout= 300mA 2.5 2 Ouput voltage (V) Output Voltage (V) 4.5 Output voltage VS Output current 3.3V 3 4 input voltage (V) 1.8V 1.5 1 0.5 2.5 2 1.8V 1.5 1 0.5 0 0 50 60 70 80 90 100 110 120 130 0 Temperature (degree) 50 100 150 200 250 Output current (mA) Startup delay time Shutdown delay time Rout = 10Ω Vout = 3.3V EN Rout = 10Ω Vout = 3.3V EN Vout Vout YB1253 Rev. 1.5 www.yobon.com.tw 5 300 YB1253 300mA, Low Power, High PSRR LDO Regulator Load transient response Input transient response Iout=100mA Vout =3.3V Vout VIN Iout 250mA 10mA Vout 6V VIN=4.3V Vout =3.3V 4V Power supply rejection ratio Power supply rejection ratio Vin=3.8VDC + 1VP-P, Cout=1.0μF Vin=3.8VDC + 1VP-P, Cout=1.0μF Vout=2.8V Vout=2.8V Iout=1mA Iout=10mA YB1253 Rev. 1.5 www.yobon.com.tw 6 YB1253 300mA, Low Power, High PSRR LDO Regulator Functional Block Diagram VIN EN Vref VOUT Thermal shutdown Short Circuit Protection GND Figure 3 : Function diagram Functional Description The YB1253 is an ultra-low-noise, low-quiescent current, low-dropout linear regulator. It is supplied in a SOT-23 / SOT-25 / SOT-89 package for different applications. YB1253 can supply load current up to 300mA (typical operation, not maximum) with good line and load regulation. Output voltages are preset and ranging from 1.2V to 3.6V. 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. As shown in the Functional Block Diagram, the YB1253 consists of a reference and noise bypass circuit, error amplifier, output drive transistor, internal feedback voltage divider, thermal sensor, and short circuit current limiter. Stability The internal reference is connected to the error amplifier’s inverting input. The error amplifier compares this reference with the feedback voltage YB1253 Rev. 1.5 The YB1253 is a high performance LDO emphasizing stability with low output capacitance. It is able to maintain stability with an output capacitor as low as 1.0µF. The output capacitor can also be increased to optimize performance. The YB1253 will remain stable and in regulation with no load, unlike many other voltage regulators. www.yobon.com.tw 7 YB1253 300mA, Low Power, High PSRR LDO Regulator Internal P-Channel Pass Transistor Application Information The YB1253 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 YB1253 consumes only 10µA of quiescent current under most conditions. Enable/Shutdown Output Short-Circuit Current Limit The YB1253 includes a current limiter, which monitors and controls the pass transistor’s gate voltage, limiting the output current to about 500mA, for example, in a short-circuit output situation. Shutdown The YB1253 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. The YB1253 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 in the YB1253 input and a 1.0µF capacitor in 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. 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. YB1253 Rev. 1.5 www.yobon.com.tw 8 YB1253 300mA, Low Power, High PSRR LDO Regulator SOT-25 Package Information A1 E1 A2 D e1 bx5 e A E L2 L1 G AU GE PLAN E t L Symbol C Inches MIN. MAX. MIN. MAX. A 0.95 1.45 .037 .057 A1 0.05 0.15 .002 .006 A2 0.90 1.30 .035 .051 b 0.30 0.50 .0118 .019 C 0.08 0.20 .0031 .0078 D 2.84 3.00 .1118 .118 E 1.50 1.70 .059 .0669 E1 2.60 3.00 .102 .118 e 0.95 BSC. .0374 BSC. e1 1.90 BSC. .0748 BSC. L 0.35 0.55 .0137 .0216 L1 0.10 BSC. .0039 BSC. L2 0.60 REF. .0236 REF. t YB1253 Rev. 1.5 milimeters 0° 8° 0° www.yobon.com.tw 8° 9 YB1253 300mA, Low Power, High PSRR LDO Regulator SOT-23 Package Information A1 A2 E1 b?3 D e1 e A E L2 L1 GAUGE PLANE t L Symbol C MIN. MAX. A 0.95 1.45 .037 .057 A1 0.05 0.15 .002 .006 A2 0.90 1.30 .035 .051 b 0.30 0.50 .0118 .019 C 0.08 0.20 .0031 .0078 D 2.84 3.00 .1118 .118 E 1.50 1.70 .059 .0669 E1 2.60 3.00 .102 .118 Inches MIN. MAX. e 0.95 BSC. .0374 BSC. e1 1.90 BSC. .0748 BSC. L 0.35 0.55 .0137 .0216 L1 0.10 BSC. .0039 BSC. L2 0.60 REF. .0236 REF. t YB1253 Rev. 1.5 milimeters 0° 8° www.yobon.com.tw 0° 8° 10 YB1253 300mA, Low Power, High PSRR LDO Regulator SOT-89 Package Information bx2 E1 D b2 e1 e b1 E L A Symbol C Inches MIN. MAX. MIN. MAX. A 1.40 1.60 .055 .063 b 0.36 0.48 .014 .019 b1 0.44 0.56 .017 .022 b2 1.50 1.83 .059 .072 C 0.35 0.44 .014 .017 D 4.40 4.60 .173 .181 E 2.29 2.60 .090 .102 E1 3.94 4.25 .155 .167 e 1.50 BSC. .059 BSC. e1 3.00 BSC. .118 BSC. L YB1253 Rev. 1.5 milimeters 0.89 1.20 .035 www.yobon.com.tw .047 11