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YB1200R
150mA High PSRR with Auto-Discharge LDO Regulator
Description
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 0.1 V per step (custom voltage is considerable at request). 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 0.47 F output capacitor for stability with any load and consumes less than 1A 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.
Features
* * * * * * * * * * * * * High Accuracy Output Voltage : + 2% Wide Output Voltage Range : 1.2~3.6V Ultra-Low-Noise Low-Drop-Out Typical Output Current : 150 mA Low Quiescent Current: ~60A 180mV Dropout at 150mA 3.3V Output Stable with 0.47F 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 Circuitry
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YB1200R
150mA High PSRR with Auto-Discharge LDO Regulator
Pin Configuration
Pin Description
Table 1
Pin Name VIN GND EN BYPASS VOUT
Pin Function Unregulated Input Supply. Bypass with a capacitor to GND. Ground pin. 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.
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YB1200R
150mA High PSRR with Auto-Discharge LDO Regulator
Ordering Information
Marking Information
Absolute Maximum Ratings
Supply Voltage ................................................ -0.3V to 7.0V 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
Recommended Operating Conditions
Input Supply Voltage.........................................2V to 6.0V Operating Temperature............................ -40 to +85 ESD Susceptibility (HBM)...........................................2KV ESD Susceptibility (MM)........................................... 200V
Thermal Resistance (SC-70/82, JA) ................330/W Internal Power Disspation (SC-70/82, PD)..............0.3W
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YB1200R
150mA High PSRR with Auto-Discharge LDO Regulator
Electrical Characteristics
Table 2
Function Parameter Input Voltage Range Output Voltage Output Voltage Accuracy Output Current Limit Predefined IOUT = 10mA, VOUT >= 1.3V Iout = 10mA, VOUT = 1.2V Short-circuit output Vout = 3.6V, Iout = 150 mA Vout = 3.0V, Iout = 150 mA Dropout Voltage (Note 1) Vout = 2.5V, Iout = 150 mA Vout = 1.5V, Iout = 150 mA Vout = 1.2V, Iout = 150 mA Ground Current Line Regulation Load Regulation Shutdown Supply Current Iground = Iin - Iout Vin = (Vout + 1V) to 6V, Iout = 10 mA Iout = 1mA to 150 mA EN = 0.4V f = 1KHz, Iout = 1 mA Ripple Rejection (PSRR) f = 10KHz, Iout = 1 mA f = 100 KHz, Iout = 1 mA Start Up Delay (Note 2) Rload=100ohm,Cbypass=0nF Rload=100 ohm, Cbypass=33nF Rload=10K ohm, VOUT=1.5V Rload=10K ohm, VOUT=1.2V Vin = 2.0V to 6.0V Vin = 2.0V to 6.0 V Vin = EN = Vout + 1V Shutdown Temperature 1.2 0.01 160 20
TA = 25, VIN = ( VOUT + 1 V ), CIN = COU T = 0.47F, VEN = VIN, unless otherwise noted
Conditions
Min 2.0 1.2 -2.0 0
Typ
Max 6.0 3.6 +2.0 +4.0
Units V V % % mA
45 150 180 250 380 510 60 0.30 0.6 0.01 60 78 69 20 2 1 1 0.4 Vin 50 3.5 0.40 1.2
mV
A %/V % A
dB
S mS mS mS V V A C C
Shutdown Delay (Note 3) EN Logic Low Level EN Logic High Level EN Input Bias Current Thermal Shutdown Thermal Hysteresis
Note1 : 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. Note 2: Time needed for VOUT to reach 90% of final value. Note 3: Time needed for VOUT to discharge below 0.5V.
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YB1200R
150mA High PSRR with Auto-Discharge LDO Regulator
Typical Characteristics
At TA=25, VIN=(VOUT+1V), CIN=COUT=0.47F, VEN=VIN, unless otherwise noted.
YB1200R MRev. 1.0
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YB1200R
150mA High PSRR with Auto-Discharge LDO Regulator
YB1200R MRev. 1.0
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YB1200R
150mA High PSRR with Auto-Discharge LDO Regulator
YB1200R MRev. 1.0
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YB1200R
150mA High PSRR with Auto-Discharge LDO Regulator
Functional Block Diagram
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 feedback voltage and amplifies the difference. If the feedback voltage is lower
YB1200R MRev. 1.0
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 0.47 uF. 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. Internal P-Channel Pass Transistor The YB1200R features a low impedance
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YB1200R
150mA High PSRR with Auto-Discharge 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 YB1200R consumes only 60A 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 1A. Thermal Protection Shutdown The thermal protection shutdown function protects the device from operating in over temperature condition. When the junction temperature exceeds +160C, 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 +140C. Auto-Discharge Circuitry The YB1200R deploys a NMOS connecting 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 shudown 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 1.0F capacitor on the YB1200R input and a 1.0F 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.
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YB1200R
150mA High PSRR with Auto-Discharge LDO Regulator
SC-70 Package Information
Symbol A A1 A2 b C D E E1 e e1 L
Millimeters MIN. 0.90 0.025 0.875 0.20 0.10 1.90 1.15 2.00 0.65 BSC. 1.30 BSC. 0.425 REF. MAX. 1.10 0.10 1.00 0.40 0.15 2.10 1.35 2.20 MIN. .036 .001 .035 .008 .004 .076 .046 .080
Inches MAX. 0.44 .004 .040 .016 .006 .084 .054 .088 .026 BSC. .052 BSC. .017 REF.
Note: 1. All dimensions are in millimeters, and the dimensions in inches are for reference only. 2. 1mm=40mils=0.04inches
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YB1200R
150mA High PSRR with Auto-Discharge LDO Regulator
SC-82 Package Information
NOTE: 1. CONTROLUNG DIMENSION: mm 2. LEAD FRAME MATERIAL:EFTEC-64T 1/2H OR H. 3. DIMENSION D DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS, MOLD FLASH/PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.15 mm PER SIDE, 4. DIMENSION E1 DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSION. INTERLEAD FLASH OR PROTRUSION SHALL NOT EXCEED 0.15mm PER SIDE.
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