Datasheet ADP5138 (Analog Devices)

Quad, 1 A, 5.5 V, Synchronous Step-Down Regulators with One RF LDO Regulator Data Sheet ADP5138 FEATURES TYPICAL APPLICATION CIRCUIT PVINx voltage range: 3 V to 5.5 V VOUT1 ADP5138 Continuous output current R Channel 1 to Channel 4 (buck): 1 A POR POR AVIN POR Channel 5 (LDO): 250 mA CAVIN L1 EN1 VOUT1 = 3.3V 3.2 MHz fixed PWM switching frequency V SW1 IN = 5V ± 10% PVIN1 Synchronization input function FB1 COUT1 CIN1 PGND1 Buck regulators run at 90° out of phase L2 Individual precision enable input V EN2 OUT2 = 1.0V SW2 Power-on reset output PVIN2 R C TOP2 OUT2 C Integrated compensation IN2 FB2 RBOT2 PGND2 Soft start and power-up sequencing reduce inrush current L3 V Active output discharge switch function EN3 OUT3 = 1.25V SW3 PVIN3 Stable with low ESR output ceramic capacitors RTOP3 COUT3 CIN3 FB3 OVLO, UVM, and UVLO RBOT3 PGND3 TSD protection L4 V Qualified for automotive applications EN4 OUT4 = 1.35V SW4 PVIN4 FB4 COUT4 APPLICATIONS CIN4 PGND4 Automotive V Industrial and instrumentation EN5 OUT5 = 1.8V VOUT5 RTOP5 DC to dc point of load applications PVIN5 FB5 COUT5 CIN5 SYNC GND RBOT5
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GENERAL DESCRIPTION
The ADP5138 integrates four high performance synchronous The ADP5138 integrates internal compensation to simplify step-down regulators and one low noise radio frequency (RF) the design. The internal soft start circuitry and power-up low dropout (LDO) regulator. The device runs from PVINx sequencing help reduce the input inrush current. input voltages of 3 V to 5.5 V. The output voltage of each The ADP5138 monitors the input voltage and provides input channel is factory set or can be programmed down to 0.8 V overvoltage lockout (OVLO), undervoltage monitor (UVM), with a resistor. Each step-down regulator can provide up to 1 A and undervoltage lockout (UVLO) features. It also monitors the of continuous output current and the LDO can provide 250 mA undervoltage and overvoltage of the outputs. The power-on of output current. reset (POR) signal is asserted when the input or output voltage The ADP5138 runs at the fixed PWM switching frequency, fault occurs. 3.2 MHz, or can be synchronized to the external clock from Additional protection includes overcurrent protection (OCP) 2.8 MHz to 3.5 MHz, which is outside the amplitude and thermal shutdown (TSD). modulation (AM) band. The four buck regulators run at 90° out of phase to reduce the input ripple current and the input The ADP5138 operates over the −40°C to +125°C operating capacitor size, thereby helping to lower system electromagnetic temperature range (junction), and is available in a 28-lead interference (EMI). LFCSP package.
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Document Outline Features Applications Typical Application Circuit General Description Revision History Functional Block Diagram Specifications Buck Regulator Specifications LDO Regulator Specifications Absolute Maximum Ratings Thermal Resistance ESD Caution Pin Configuration and Function Descriptions Typical Performance Characteristics Theory of Operation Control Scheme Precision Enable and Shutdown Oscillator and Phase Shift Synchronization Input Overvoltage Lockout (OVLO) Input Undervoltage Monitor (UVM) Input Undervoltage Lockout (UVLO) Output Voltage Power-Good Power-On Reset (POR) Soft Start and Power-Up Sequence Current-Limit and Short-Circuit Protection Active Output Discharge Thermal Shutdown Applications Information Input Capacitor Selection Output Voltage Setting Inductor Selection Output Capacitor Selection Application Circuit Factory-Programmable Options Outline Dimensions Ordering Guide Automotive Products