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YB1231 - HV600mA
Low-Noise LDO Regulator
Description
The YB1231 is a series of ultra-low-noise, low dropout (LDO) linear regulators with 2.0% output voltage accuracy. The YB1231 regulators achieve a low 440mV dropout at 600mA load current of 4.5V output and are available in voltages ranging from 3.2V to 4.5V with 0.1 V per step (custom voltage is considerable at request). The YB1231 regulators are optimized to work with low-ESR and low cost ceramic capacitors, reducing the amount of board space critical in hand-held devices. The YB1231 requires only 2.2 F output capacitor for stability with any load and consumes less than 1A in shutdown mode. Built-in thermal shutdown and short-circuit protect offer secure protection against fault operation. The YB1231 regulators are available in SOT-23 / SOT-25 / SOT-89 packages.
Features
2.0% Accuracy Output Voltage Output Voltage range 3.2V~4.5V Low-Noise Low-Drop-Out Stable with 2.2F Ceramic Capacitor for Any Load Typical Output Current : 600 mA Low Quiescent Current : ~100A 440mV Dropout at 600mA Load (4.5V) Only Need Input and Output Capacitors Power Saving Shutdown Mode (<1A) Thermal Protection Shutdown Built-In Internal Soft-Start Output Short-circuit Current Limit Protection Green package (RoHS) available
Applications
PDA, Palmtops and Notebook Computers DSC, Handset Camera Modules PCMCIA Cards, PC Cameras USB Based Portable Devices (MP3, PMP) GSM/GPRS/3G RF Transceiver Modules Wireless LANs Bluetooth Portable Radios
Typical Application Circuitry
YB1231 MRev. 1.4
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YB1231 - HV600mA
Low-Noise LDO Regulator
Pin Configuration
Pin Description
Table 1
Pin Name VIN GND EN VOUT
Pin Function Unregulated Input Supply. Bypass with a capacitor to GND. Ground pin. Pull high to enable the regulator. Regulated Output Voltage. Bypass with a capacitor to GND.
Ordering Information
Marking Information
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YB1231 - HV600mA
Low-Noise LDO Regulator
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 Thermal Resistance (SOT-23/25, JC) ........ 140/W Thermal Resistance (SOT-23/25, JA)......... 280/W Thermal Resistance (SOT-89, JC) ............... 46/W Thermal Resistance (SOT-89, JA).............. 180/W Thermal Power Dissipation (SOT-23/25, PD)....0.4W Thermal Power Dissipation (SOT-89, PD).......0.55W
Electrical Characteristics
Table 2
TA = 25, VIN = ( VOUT + 1 V ), CIN = COU T = 2.2F, VEN = VIN
Function Parameter Input Voltage Range Output Voltage Output Voltage Accuracy Output Current Limit Predefined IOUT = 10mA
Conditions
Min 3.5 3.2 -2.0
Typ
Max 6.0 4.5 +2.0
Units V V % mA
Short-circuit output Vout = 4.5V, Iout = 600 mA Vout = 4.0V, Iout = 600 mA
420 440 470 500 530 550 100 0.4 1.7 0.01 51 51 45 36 100 0.4 1.5 0.01 160 20 Vin 160
Dropout Voltage (Note 1)
Vout = 3.6V, Iout = 600 mA Vout = 3.3V, Iout = 600 mA Vout = 3.2V, Iout = 600 mA
mV
Ground Current Line Regulation Load Regulation Shutdown Supply Current
Iground = Iin - Iout Vin = (Vout + 1V) to 6V, Iout = 10 mA Iout = 1mA to 600 mA EN = 0.4V f = 100 Hz, Iout = 10 mA
A %/V % A
Ripple Rejection (PSRR)
f = 1KHz, Iout = 10 mA f = 10 KHz, Iout = 10 mA
dB
Shutdown Exit Delay (Note 2) EN Logic Low Level EN Logic High Level EN Input Bias Current Thermal Shutdown Thermal Shutdown Hysteresis
Vout = 3.3V, Rload = 11 ohm Vin = 2.0V to 6.0V Vin = 2.0V to 6.0 V Vin = EN = Vout + 1V Shutdown Temperature VOUT = 3.3V, IOUT = 100mA
S V V A C C
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.
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YB1231 - HV600mA
Low-Noise LDO Regulator
Typical Characteristics
At TA=25, VIN=(VOUT+1V), CIN=COUT=2.2F, VEN=VIN, unless otherwise noted.
Dropout Voltage vs Output Voltage 600 Dropout Voltage (mV) Dropout Voltage (mV) 500 400 300 200 100ILOAD=1mA 0 3 3.3 3.5 3.6 3.8 4 4.5 Output Voltage (V) 500 400 300 200 100 0 10 100 200 300 400 500 600 Load Current (mA) 3.3V 4.5V Dropout Voltage vs. Load Current
Ground Current vs. Input Voltage 140
Dropout Voltage vs. Temperature 600 Dropout Voltage (mV) 500 400 300 200 100 0 10 100 200 300 400 500 600 3.3V at 25 C 3.3V at 85 C
Ground Current (uA)
120 100 80 60 40 20 0 1 2 3 4 5 6 Input Voltage (V) 3.3V 4.5V
Load Current (mA)
YB1231 MRev. 1.4
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YB1231 - HV600mA
Low-Noise LDO Regulator
Output Voltage vs. Temperature 3.36 3.355 Output Voltage (V) 3.35 3.345 3.34 3.335 3.33 3.325 3.32 25 35 45 55 65 75 85 Temperature (C) 3.3V at 10 mA load
YB1231 MRev. 1.4
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YB1231 - HV600mA
Low-Noise LDO Regulator
Functional Block Diagram
IN
EN
SHUTDOWN AND POWER-ON CONTROL ERROR AMP MOS DRIVER WITH LIMIT
P OUT
THERMAL SENSOR
REFERENCE AND NOISE BYPASS
GND
Figure 3. Block Diagram
Functional Description
The YB1231 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. These devices can supply loads up to 600mA. As shown in the Functional Block Diagram, the YB1231 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 than the reference voltage, the pass-transistor gate is pulled low. This allows more current to pass to the output and increases the output voltage. If the
YB1231 MRev. 1.4
feedback voltage is too high, the pass transistor gate is pulled high, allowing less current to pass to the output. The parts are available with preset output voltages ranging from 3.2V to 4.5V. Stability The YB1231 is a high performance LDO emphasizing stability with low output capacitance. It is able to maintain stability with an output capacitor as low as 2.2 uF. The output capacitor can also be increased to optimize performance. The YB1231 will remain stable and in regulation with no load, unlike many other voltage regulators. Internal P-Channel Pass Transistor The YB1231 features a low impedance P-channel MOSFET pass transistor. This provides several advantages over similar
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YB1231 - HV600mA
Low-Noise LDO Regulator designs using a PNP pass transistor, including low operating power and longer battery life. The YB1231 consumes only 100A of quiescent current under most conditions. Output Short-Circuit Current Limit The YB1231 includes a current limiter, which monitors and controls the pass transistor's gate voltage, limiting the output current to about 420mA, for example, in a short-circuit output situation. Shutdown The YB1231 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. Soft-Start Circuitry The YB1231 includes a soft-start circuitry to limit inrush current at turn-on. During power
YB1231 MRev. 1.4 www.yobon.com.tw 7
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 YB1231 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 2.2F capacitor on the YB1231 input and a 2.2F 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.
YB1231 - HV600mA
Low-Noise LDO Regulator
SOT-25 Package Information
YB1231 MRev. 1.4
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YB1231 - HV600mA
Low-Noise LDO Regulator
SOT-23 Package Information
NOTE: 1. ALL DIMENSIONS ARE IN MILLIMETERS. 2. DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSION OR GATE BURRS SHALL NOT EXCEED 0.25mm PER END. DIMENSION E1 DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSION. INTERLEAD FLASH OR PROTRUSION SHALL NOT EXCEED 0.25 PER SIDE. 3. THE PACKAGE TOP MAY BE SMALLER THAN THE PACKAGE BOTTOM. DIMENSIONS D AND E1 ARE DETERMINED AT THE OUTERMOST EXTREMES OF THE PLASTIC BODY EXCLUSIVE OF MOLD FLASH, THE BAR BURRS. GATE BURRS AND INTERLEAD FLASH, BUT INCLUDING ANY MISMATCH BETEEN THE TOP AND BOTTOM OF THE PLASTIC BODY.. 4. DIMENSION"b"DOES NOT INCLUDE DAMBAR PROTRUSION. ALLOWABLE DAMBAR PROTRUSION SHALL BE 0.08mm TOTAL IN EXCESS OF THE "b"DIMENSION AT MAXIMUM MATERIAL CONDITION. THE DAMBAR CANNOT BE LOCATED ON THE LOWER RADIUS OF THE FOOT . MINMUM SPACE BETWEEN PROTRUSION AND AN ADJACENT LEAD SHALL NOT BE LESS THAN 0.07mm 5. LEAD FRAME MATERIAL:EFTEC 64T
YB1231 MRev. 1.4
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YB1231 - HV600mA
Low-Noise LDO Regulator
SOT-89 Package Information
YB1231 MRev. 1.4
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