Datasheet ADP5135 (Analog Devices)

Triple 1800 mA Buck Regulator with Precision Enables and Power-Good Outputs Data Sheet ADP5135 FEATURES TYPICAL APPLICATION CIRCUIT Input voltage range: 3.0 V to 5.5 V ADP5135 Three 1800 mA buck regulators 3.0V AVIN HOUSE- TO 17 24-lead, 4 mm × 4 mm LFCSP package KEEPING VDDIO 5.5V C7 AGND 0.1µF VOUT1 18 Regulator accuracy: ±1.8% 10 L1 1µH VIN1 SW1 Factory programmable or external adjustable VOUTx pins 16 15 C1 PGND1 FB1 10µF R1 Precision enables for easier power sequencing BUCK1 14 11 C2 1.8A 22µF R2 Power-good pins for monitoring each regulator ON EN1 OFF 12 3 MHz buck operation with forced PWM and auto PWM/PSM PWM MODE 13 AUTO modes VIN2 VOUT2 BUCK1/BUCK2/BUCK3: output voltage range from 0.8 V to 3.8 V 3 C3 9 PGND2 10µF L2 1µH 5 BUCK2 SW2 APPLICATIONS 1.8A 4 ON R3 EN2 FB2 8 C4 OFF 7 Power for processors, application specific integrated circuits 22µF R4 (ASICs), field-programmable gate arrays (FPGAs), and radio frequency (RF) chipsets VIN3 VOUT3 21 22 C5 L3 1µH Portable instrumentation and medical devices PGND3 10µF BUCK3 SW3 19 1.8A 20 Space constrained devices FB3 R5 ON EN3 23 C6 OFF 24 22µF R6 VDDIO R7 100Ω POWER PG1 R8 6 GOOD PG2 100Ω 2 R9 PG3 100Ω
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GENERAL DESCRIPTION Table 1. Family Devices
The ADP5135 combines three high performance buck regulators
Max Device Channels Current Package
(BUCK1, BUCK2, and BUCK3). It is available in a 24-lead, ADP5023 2 buck regulators, 1 LDO 800 mA, LFCSP (CP-24-10) 4 mm × 4 mm LFCSP. 300 mA The high switching frequency of the buck regulators enables tiny ADP5024 2 buck regulators, 1 LDO 1.2 A, LFCSP (CP-24-10) 300 mA multilayer external components and minimizes the board space. ADP5034 2 buck regulators, 2 LDOs 1.2 A, LFCSP (CP-24-10), When the MODE pin is set to high, the buck regulators operate in 300 mA TSSOP (RE-28-1) forced pulse-width modulation (PWM) mode. When the ADP5037 2 buck regulators, 2 LDOs 800 mA, LFCSP (CP-24-10) MODE pin is set to low, the buck regulators operate in PWM 300 mA mode only when the load is above a predefined threshold. When ADP5033 2 buck regulators, 2 LDOs 800 mA, WLCSP (CB-16-8) with 2 ENx pins 300 mA the load current falls below this predefined threshold, the ADP5040 1 buck regulator, 2 LDOs 1.2 A, LFCSP (CP-20-10) regulator operates in power save mode (PSM), improving the 300 mA light load efficiency. ADP5041 1 buck regulator, 2 LDOs 1.2 A, LFCSP (CP-20-10) with supervisory circuit, 300 mA BUCK1 and BUCK2 operate in synchronization, and BUCK3 watchdog function, and operates out of phase to reduce the input capacitor requirement. manual reset ADP5133 2 buck regulators with 800 mA WLCSP (CB-16-8) Regulators in the ADP5135 are activated through dedicated 2 ENx pins enable pins. The default output voltages can be externally set in ADP5134 2 buck regulators, 2 LDOs 1.2 A, LFCSP (CP-24-7) the adjustable version, or factory programmable to a wide range with precision enable and 300 mA power good of preset values in the fixed voltage version.
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Document Outline Features Applications Typical Application Circuit General Description Revision History Specifications BUCK1, BUCK2, and BUCK3 Input and Output Capacitors, Recommended Absolute Maximum Ratings Thermal Resistance ESD Caution Pin Configuration and Function Descriptions Typical Performance Characteristics Theory of Operation Power Management Unit Power-Good Output Thermal Protection Undervoltage Lockout Precision Enable and Shutdown Control Buck Regulators: BUCK1, BUCK2, AND BUCK3 Control Scheme PWM Mode Power Save Mode (PSM) PSM Current Threshold Oscillator/Phasing of Inductor Switching Short-Circuit Protection Buck Regulator Soft Start Current Limit 100% Duty Operation Active Pull-Down Resistors Applications Information Buck External Component Selection Feedback Resistors Inductor Output Capacitor Input Capacitor Typical Application Schematics Power Dissipation and Thermal Considerations Buck Regulator Power Dissipation Junction Temperature PCB Layout Guidelines Outline Dimensions Ordering Guide