|Place of Origin:||TAIWAN|
|Minimum Order Quantity:||10PCS|
|Payment Terms:||T/T, Western Union|
|Product Category:||Switching Regulator||Output Voltage:||800 MV To 17 V|
|Output Current:||1.2 A||Number Of Outputs:||1 Output|
|Maximum Input Voltage:||20 V||Topological Structure:||Buck|
|Minimum Input Voltage:||3 V||Switching Frequency:||700kHz|
|Minimum Operating Temperature:||-40 C||Maximum Operating Temperature:||+ 125 C|
|Height:||0.87 Mm||Length:||2.9 Mm|
|Width:||1.6 Mm||Factory Packing Quantity:||3000|
700kHz Switching Regulator Analog Devices,
1.2A Switching Regulator Analog Devices,
ADP2300AUJZ-R7 Integrated Circuits Switching Regulator
ADP2300AUJZ-R7 ELECTRONIC INTEGRATED CIRCUITS SWITCHING REGULATOR 20V, 1.2A, NON-SYNC, STEP DOWN DC-DC
1.2 A maximum load current
±2% output accuracy over temperature range
Wide input voltage range: 3.0 V to 20 V
700 kHz (ADP2300) or 1.4 MHz (ADP2301) switching frequency options
High efficiency up to 91%
Current-mode control architecture
Output voltage from 0.8 V to 0.85 × VIN
Automatic PFM/PWM mode switching
Precision enable pin with hysteresis
Integrated high-side MOSFET
Integrated bootstrap diode
Internal compensation and soft start
Minimum external components
Undervoltage lockout (UVLO)
Overcurrent protection (OCP) and thermal shutdown ( TSD)
Available in ultrasmall, 6-lead TSOT packageSupported by ADIsimPower™ design tool
The ADP2300/ADP2301 are compact, constant-frequency, current-mode, step-down dc-to-dc regulators with integrated power MOSFET. The ADP2300/ADP2301 devices run from input voltages of 3.0 V to 20 V, making them suitable for a wide range of applications. A precise, low voltage internal reference makes these devices ideal for generating a regulated output voltage as low as 0.8 V, with ±2% accuracy, for up to 1.2 A load current. There are two frequency options: the ADP2300 runs at 700 kHz, and the ADP2301 runs at 1.4 MHz. These options allow users to make decisions based on the trade-off between efficiency andtotal solution size. Current-mode control provides fast and stable line and load transient performance. The ADP2300/ADP2301 devices include internal soft start to prevent inrush current at power-up. Other key safety features include short-circuit protec-tion, thermal shutdown (TSD), and input undervoltage lockout(UVLO). The precision enable pin threshold voltage allows the ADP2300/ADP2301 to be easily sequenced from other input/output supplies. It can also be used as a programmable UVLO input by using a resistive divider.The ADP2300/ADP2301 are available in a 6-lead TSOT package and are rated for the −40°C to +125°C junction temperature range.
THEORY OF OPERATION The ADP2300/ADP2301 are nonsynchronous, step-down dc-to-dc regulators, each with an integrated high-side power MOSFET. A high switching frequency and ultrasmall, 6-lead TSOT package allow small step-down dc-to-dc regulatorsolutions. The ADP2300/ADP2301 can operate with an input voltage from3.0 V to 20 V while regulating an output voltage down to 0.8 V. The ADP2300/ADP2301 are available in two fixed-frequency options: 700 kHz (ADP2300) and 1.4 MHz (ADP2301)
BASIC OPERATIONThe ADP2300/ADP2301 use the fixed-frequency, peak current-mode PWM control architecture at medium to high loads, but shift to a pulse-skip mode control scheme at light loads to reduce the switching power losses and improve efficiency. When the devices operate in fixed-frequency PWM mode, output regulationis achieved by controlling the duty cycle of the integrated MOSFET.When the devices operate in pulse-skip mode at light loads, the output voltage is controlled in a hysteretic manner with higher output ripple. In this mode of operation, the regulator periodically stops switching for a few cycles, thus keeping the conversion losses minimal to improve efficiency..
PWM MODEIn PWM mode, the ADP2300/ADP2301 operate at a fixed frequenc y, set by an internal oscillator. At the start of each oscillator cycle, the MOSFET switch is turned on, sending a positive voltage across the inductor. The inductor current increases until the current-sense signal crosses the peak inductor current threshold that turns off the MOSFET switch; this threshold is set by the error amplifier output. During the MOSFET off time, the inductor current declines through the external diode until the next oscillator clock pulse starts a new cycle. The ADP2300/ADP2301 regulate the output voltage by adjusting the peak inductor current threshold.
POWER SAVING MODETo achieve higher efficiency, the ADP2300/ADP2301 smoothly transition to the pulse-skip mode when the output load decreasesbelow the pulse-skip current threshold. When the output voltagedips below regulation, the ADP2300/ADP2301 enter PWM modefor a few oscillator cycles until the voltage increases to withinregulation. During the idle time between bursts, the MOSFET switch is turned off, and the output capacitor supplies all the output current.Since the pulse-skip mode comparator monitors the internal compensation node, which represents the peak inductor current information, the average pulse-skip load current threshold dependson the input voltage (VIN), the output voltage (VOUT), the inductor, and the output capacitor. Because the output voltage occasionally dips below regulation and then recovers, the output voltage ripple in the power savingmode is larger than the ripple in the PWM mode of operation.
BOOTSTRAP CIRCUITRYThe ADP2300/ADP2301 each have an integrated boot regulator, which requires that a 0.1 μF ceramic capacitor (X5R or X7R) be placed between the BST and SW pins to provide the gate drive voltage for the high-side MOSFET. There must be at least a 1.2 V difference between the BST and SW pins to turn on the high-sideMOSFET. This voltage should not exceed 5.5 V in case the BST pin is supplied with an external voltage source through a diode.The ADP2300/ADP2301 generate a typical 5.0 V bootstrap voltagefor a gate drive circuit by differentially sensing and regulating thevoltage between the BST and SW pins. A diode integrated on thechip blocks the reverse voltage between the VIN and BST pins when the MOSFET switch is turned on. PRECISION ENABLEThe ADP2300/ADP2301 feature a precision enable circuit thathas a 1.2 V reference voltage with 100 mV hysteresis. When the voltage at the EN pin is greater than 1.2 V, the part is enabled. If the EN voltage falls below 1.1 V, the chip is disabled. The precisionenable threshold voltage allows the ADP2300/ADP2301 to be easily sequenced from other input/output supplies. It can also be used as programmable UVLO input by using a resistive d iv id e r.An internal 1.2 μA pull-down current prevents errors if the EN pin is floating.INTEGRATED SOFT STARTThe ADP2300/ADP2301 include internal soft start circuitry that ramps the output voltage in a controlled manner during startup, thereby limiting the inrush current. The soft start time istypically fixed at 1460 μs for the ADP2300 and at 730 μs for theADP2301.CURRENT LIMITThe ADP2300/ADP2301 include current-limit protection circuitry to limit the amount of positive current flowing through the high-side MOSFET switch. The positive current limit on the power switch limits the amount of current that can flow from the input to the output.
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