Datasheet ADP2300, ADP2301 (Analog Devices)

1.2 A, 20 V, 700 kHz/1.4 MHz, Nonsynchronous Step-Down Regulator Data Sheet ADP2300/ ADP2301 FEATURES TYPICAL APPLICATIONS CIRCUIT 1.2 A maximum load current 3.0V TO 20V BST ±2% output accuracy over temperature range VIN Wide input voltage range: 3.0 V to 20 V VOUT ADP2300/ SW 700 kHz (ADP2300) or 1.4 MHz (ADP2301) ADP2301 switching frequency options EN High efficiency up to 91% ON FB OFF GND Current-mode control architecture
001
Output voltage from 0.8 V to 0.85 × V IN
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Automatic PFM/PWM mode switching
Figure 1.
Precision enable pin with hysteresis 100 Integrated high-side MOSFET fSW = 1.4MHz fSW = 700kHz Integrated bootstrap diode 95 Internal compensation and soft start 90 Minimum external components %) 85 Undervoltage lockout (UVLO) ( Y C Overcurrent protection (OCP) and thermal shutdown (TSD) N 80 IE Available in ultrasmall, 6-lead TSOT package FFIC 75 Supported by ADIsimPower™ design tool E APPLICATIONS 70 LDO replacement for digital load applications 65 VIN = 12V Intermediate power rail conversion VOUT = 5.0V 60 Communications and networking 0 0.2 0.4 0.6 0.8 1.0 1.2
069
Industrial and instrumentation IOUT (A)
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Healthcare and medical
Figure 2. Efficiency vs. Output Current
Consumer GENERAL DESCRIPTION
The ADP2300/ADP2301 are compact, constant-frequency, total solution size. Current-mode control provides fast and stable current-mode, step-down dc-to-dc regulators with integrated line and load transient performance. The ADP2300/ADP2301 power MOSFET. The ADP2300/ADP2301 devices run from devices include internal soft start to prevent inrush current at input voltages of 3.0 V to 20 V, making them suitable for a wide power-up. Other key safety features include short-circuit protec- range of applications. A precise, low voltage internal reference tion, thermal shutdown (TSD), and input undervoltage lockout makes these devices ideal for generating a regulated output (UVLO). The precision enable pin threshold voltage allows the voltage as low as 0.8 V, with ±2% accuracy, for up to 1.2 A load ADP2300/ADP2301 to be easily sequenced from other input/ current. output supplies. It can also be used as a programmable UVLO There are two frequency options: the ADP2300 runs at 700 kHz, input by using a resistive divider. and the ADP2301 runs at 1.4 MHz. These options allow users to The ADP2300/ADP2301 are available in a 6-lead TSOT package make decisions based on the trade-off between efficiency and and are rated for the −40°C to +125°C junction temperature range.
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Document Outline Features Applications Typical Applications Circuit General Description Revision History Specifications Absolute Maximum Ratings Thermal Resistance ESD Caution Pin Configuration and Function Descriptions Typical Performance Characteristics Functional Block Diagram Theory of Operation Basic Operation PWM Mode Power Saving Mode Bootstrap Circuitry Precision Enable Integrated Soft Start Current Limit Short-Circuit Protection Undervoltage Lockout (UVLO) Thermal Shutdown Control Loop Applications Information ADIsimPower Design Tool Programming the Output Voltage Voltage Conversion Limitations Low Input Voltage Considerations Programming the Precision Enable Inductor Catch Diode Input Capacitor Output Capacitor Thermal Considerations Design Example Switching Frequency Selection Catch Diode Selection Inductor Selection Output Capacitor Selection Resistive Voltage Divider Selection Circuit Board Layout Recommendations Typical Application Circuits Outline Dimensions Ordering Guide