YB1220 YOBON | Alldatasheet

Document overview

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Technical content

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

Dual Channel 200mA LDO Regulator Pin Name SOT-26M Description

1 EN1 Pull High to Enable Output VO1

2 GND Ground Pin

3 EN2 Pull High to Enable Output VO2

4 VO2 Regulated Output Voltage 2

5 VIN Unregulated Input Supply

6 VO1 Regulated Output Voltage 1

Pin Name SOT-26R Description

1 VO1 Regulated Output Voltage 1

3 EN1 Pull High to Enable Output VO1

4 EN2 Pull High to Enable Output VO2

6 VO2 Regulated Output Voltage 2

Pin Name SOT-26T Description

2 VIN Unregulated Input Supply

5 GND Ground Pin

Dual Channel 200mA LDO Regulator

Ordering Information

Recommended Operating Conditions

Dual Channel 200mA LDO Regulator Function Parameter Conditions Min Typ Max Units Input Voltage Range 2.0 6.0 V Output Voltage Predefined 1.2 3.6 V IOUT = 10mA, VO >= 1.3V -2.0 +2.0 % Output Voltage Accuracy IOUT = 10mA, VO = 1.2V 0 +4.0 % Output Current Limit Short-Circuit Output Limit 80 mA VOUT = 3.3V, IOUT = 200mA 300 VOUT = 2.8V, IOUT = 200mA 380 VOUT = 2.5V, IOUT = 200mA 420 VOUT = 1.8V, IOUT = 200mA 550 Dropout Voltage (Note 1) VOUT = 1.2V, IOUT = 200mA 800 mV Ground Current Iout = 0mA 80 μA Line Regulation VIN = Max(VO1,VO2)+1V to 6V, Iout =10mA 0.4 %/V Load Regulation Iout = 1mA to 200mA 1.0 % Shutdown Supply Current EN1 = EN2 = 0V ~0.01 μA F = 1KHz, Iout = 1mA 62 dB F = 10KHz, Iout = 1mA 50 dB Ripple Rejection (PSRR) F = 100KHz, Iout = 1mA 34 dB EN Logic Low Level VIN = 2.0V to 6V 0.4 V EN Logic High Level VIN = 2.0V to 6V 1.5 V EN Input Bias Current VIN = EN = 6V 0.01 μA Thermal Shutdown Shutdown Temperature 160 ℃ Thermal Hysteresis 20 ℃

Electrical Characteristics

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. TA = 25℃, VIN= Max(VO1,VO2) + 1 V , CIN = COU T1= Cout2=1.0μF, EN = VIN, unless otherwise noted

Dual Channel 200mA LDO Regulator Typical Characteristics At TA=25℃, VIN=Max(VO1,VO2) +1V, CIN=COUT=1.0μF, EN=VIN, unless otherwise noted.

Dual Channel 200mA LDO Regulator ILoad=80mA

Dual Channel 200mA LDO Regulator Functional Block Diagram 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 difference. If the feedba ck 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

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 YB 1220 consumes only 90µA around of quie scent current under most conditions. Output Short-Circuit Current Limit The YB1220 includes tw o 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 feat ures 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 1µA. 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 protecti on 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. Soft-Start Circuitry 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

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 1.0µF capacitor on the YB1220 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. Transient Response The transient response can be improved by increasing the values of the input and output bypass capacitors, and through passive filtering techniques.

Dual Channel 200mA LDO Regulator