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Dual Channel 200mA LDO Regulator
Description
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.
YB1220
Features
* * * * * * * * * * * * 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
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Dual Channel 200mA LDO Regulator
Pin Configuration
YB1220
Pin Description
Table 1
Pin 1 2 3 4 5 6 Pin 1 2 3 4 5 6
Name EN1 GND EN2 VO2 VIN VO1 Name EN1 VIN EN2 VO2 GND VO1
SOT-26M Description Pull High to Enable Output VO1 Ground Pin Pull High to Enable Output VO2 Regulated Output Voltage 2 Unregulated Input Supply Regulated Output Voltage 1 SOT-26T Description Pull High to Enable Output VO1 Unregulated Input Supply Pull High to Enable Output VO2 Regulated Output Voltage 2 Ground Pin Regulated Output Voltage 1
Pin 1 2 3 4 5 6
Name VO1 GND EN1 EN2 VIN VO2
SOT-26R Description Regulated Output Voltage 1 Ground Pin Pull High to Enable Output VO1 Pull High to Enable Output VO2 Unregulated Input Supply Regulated Output Voltage 2
YB1220 MRev.1.1
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Dual Channel 200mA LDO Regulator
Ordering Information
YB1220
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 (SOT-26, JC) ....................140/W Thermal Resistance (SOT-26, JA) ....................250/W Internal Power Dissipation (SOT-26, PD).................. 0.4W
YB1220 MRev.1.1
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Dual Channel 200mA LDO Regulator
Electrical Characteristics
Table 2
TA = 25, VIN= Max(VO1,VO2) + 1 V , CIN = COU T1= Cout2=1.0F, EN = VIN, unless otherwise noted
YB1220
Function Parameter Input Voltage Range Output Voltage Output Voltage Accuracy Output Current Limit Predefined
Conditions
Min 2.0 1.2 -2.0 0
Typ
Max 6.0 3.6 +2.0 +4.0
Units V V % % mA
IOUT = 10mA, VO >= 1.3V IOUT = 10mA, VO = 1.2V Short-Circuit Output Limit VOUT = 3.3V, IOUT = 200mA VOUT = 2.8V, IOUT = 200mA
80 300 380 420 550 800 80 0.4 1.0 ~0.01 62 50 34 0.4 1.5 0.01 160 20
Dropout Voltage
(Note 1)
VOUT = 2.5V, IOUT = 200mA VOUT = 1.8V, IOUT = 200mA VOUT = 1.2V, IOUT = 200mA
mV
Ground Current Line Regulation Load Regulation Shutdown Supply Current
Iout = 0mA VIN = Max(VO1,VO2)+1V to 6V, Iout =10mA Iout = 1mA to 200mA EN1 = EN2 = 0V F = 1KHz, Iout = 1mA
A %/V % A dB dB dB V V A
Ripple Rejection (PSRR)
F = 10KHz, Iout = 1mA F = 100KHz, Iout = 1mA
EN Logic Low Level EN Logic High Level EN Input Bias Current Thermal Shutdown Thermal Hysteresis
VIN = 2.0V to 6V VIN = 2.0V to 6V VIN = EN = 6V Shutdown Temperature
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
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Dual Channel 200mA LDO Regulator
YB1220
Typical Characteristics
At TA=25, VIN=Max(VO1,VO2) +1V, CIN=COUT=1.0F, EN=VIN, unless otherwise noted.
YB1220 MRev.1.1
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Dual Channel 200mA LDO Regulator
YB1220
ILoad=80mA
YB1220 MRev.1.1
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Dual Channel 200mA LDO Regulator
Functional Block Diagram
YB1220
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. 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 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
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. Stability 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. Internal P-Channel Pass Transistor The YB1220 features a low impedance
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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 90A 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 1A. 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 +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
YB1220
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 1.0F capacitor on the YB1220 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. Transient Response The transient response can be improved by increasing the values of the input and output bypass capacitors, and through passive filtering techniques.
YB1220 MRev.1.1
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Dual Channel 200mA LDO Regulator
SOT-26 Package Information
YB1220
YB1220 MRev.1.1
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