Datasheet LTM4664 (Analog Devices) - 6

link to page 84 LTM4664
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the internal operating junction temperature. TA = 25°C, VINS1 = 48V, and RUNn = 5V where n = stage # unless otherwise noted. See Figure 46 configuration for setup. (Note 3) SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS OVP Comparator
OVP-SET In OVP-SET Input Range MAX 25 V VOUT2-SET VOUT2-SET Range MAX 25 V IB Input Bias I VCM = 0V to 25V 30 mA VOS Input Offset 0.5V < VCM < 25V 3 mV PSRR Power Supply Rejection 0.5V < VCM < 25V (Note 10) 85 db CMRR Common Mode Rejection 0.5V < VCM < 25V (Note 10) 80 db Delay Propagation Delay 10 µs OVP_Trip Sink OVP_Trip Sink ISINK = 5mA (Note 10) 0.35 V
INTVCC Regulators
VINTVCCSn Internal (LDO) Low Drop Out 30V < VINS1 < 58V, VEXTVCCS1 = 0V, Stage 1 5.4 5.6 5.9 V Regulator, n = Stage # 15V < VINS2 < 19V, VEXTVCCS2 = 0V, Stage 2 VINTVCCSn Load LDO Load Regulation ICC = 50mA, VEXTVCCSn = 0V 0.5 2 % INTVCCSn IPeak INTVCC Stage Peak Output Current 150 mA VINTVCCSn with LDO Output Range with EXTVCCn, 12V < VEXTVCCn < 24V, 5.4 5.6 5.9 V EXTVCC n = Stage # VINSn = 12V VINTVCCSn Load LDO Load Regulation with EXTVCC ICC = 50mA, VEXTVCCn = 6.5V 1 2 % EXT VEXTVCCn Threshold EXTVCCn Switch Over VEXTVCCn Ramping Positive 6.3 6.5 6.65 V VEXTVCCn HYS EXTVCCn Hysteresis 400 mV
Switching Oscillator
Frequency Range n Frequency Range n = Stage # 100 1000 kHz fNOM Stage 1 Optimized Efficiency Freq. Stage 1 FREQS1. Pin Resistor = 36.5k 100 kHz fNOM Stage 2 Optimized Efficiency Freq. Stage 2 FREQS2. Pin Resistor = 60.4k 200 kHz
Output Specifications
ΔVOUT/VOUT Stage 1 Load Regulation Accuracy VOUT1 = 24V, 0A to 3.2A Maximum = 75W 3.5 % Stage 1 VINS1 = 48V, FREQS1 = 100kHz CINB1 = 33µF (Bulk Input Capacitor) CIN1 = 2.2µF 100V Ceramic, CFLY1 = 10µF 50V X6 COUT1 = 10µF 50V VOUT1 Output Load VOUT1 Max Load Current VOUT1 = 24V, 0A to 3.2A Maximum = 75W 3.2 A (Note 4) VINS1 = 48V, FREQS1 = 100kHz CINB1 = 33µF (Bulk Input Capacitor) CIN1 = 2.2µF 100V Ceramic, CFLY1 = 10µF 50V X6 COUT1 = 10µF 50V M1-M4 RDS-ON Stage 1 MOSFET On Resistance VGS = 5V (Note 16) 18 mΩ ΔVOUT/VOUT Stage 2 Load Regulation Accuracy VOUT2 = 12V, 0A to 6.3A Maximum = 75W 5 % Stage 2 VINS2 = 24V, FREQS2 = 200kHz CINB2 = 33µF (Bulk Input Capacitor) CIN2 = 10µF 50V Ceramic, CFLY2 = 22µF 25V X6, COUT2 = 22µF 25V VOUT2 Output Load VOUT1 Max Load Current VOUT2 = 12V, 0A to 6.3A Maximum = 75W 6.3 A (Note 4) VINS2 = 24V, FREQS2 = 200kHz CINB2 = 33µF (Bulk Input Capacitor) CIN2 = 10µF 50V Ceramic, CFLY2 = 22µF 25V X6, COUT2 = 22µF 25V Rev. 0 6 For more information www.analog.com Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics 4:1 Divider Block Diagram Dual 25A Power System Management (PSM) Block Diagram 4:1 Divider Operation 4:1 Divider Description Main Control INTVCCS1,2/EXTVCCS1,2 Power Start-Up and Shutdown Fault Protection and Thermal Shutdown High Side Current Sensing Frequency Selection Power Good and UV (PGOODSn and UVSn pins) Additional Overvoltage Protection 4:1 Divider Application Information Voltage Divider Pre-Balance Before Switching Overcurrent Protection Window Comparator Programming Effective Open Loop Output Resistance and Load Regulation Undervoltage Lockout Fault Response and Timer Programming Design Example Dual 25A PSM Operation PSM Section Overview, Major Features EEPROM with ECC Power-Up and Initialization Soft-Start Time-Based Sequencing Voltage-Based Sequencing Shutdown Light-Load Current Operation Switching Frequency and Phase PWM Loop Compensation Output Voltage Sensing INTVCC/EXTVCC Power Output Current Sensing and Sub Milliohm DCR Current Sensing Input Current Sensing PolyPhase Load Sharing External/Internal Temperature Sense RCONFIG (Resistor Configuration) Pins Fault Detection and Handling Status Registers and ALERT Masking Mapping Faults to FAULT Pins Power Good Pins CRC Protection Serial Interface Communication Protection Device Addressing Responses to VOUT and IIN/IOUT Faults Output Overvoltage Fault Response Output Undervoltage Response Peak Output Overcurrent Fault Response Responses to Timing Faults Responses to VIN OV Faults Responses to OT/UT Faults Internal Overtemperature Fault Response External Overtemperature and Undertemperature Fault Response Responses to Input Overcurrent and Output Undercurrent Faults Responses to External Faults Fault Logging Bus Timeout Protection Similarity Between PMBus, SMBus and I2C 2-Wire Interface PMBus Serial Digital Interface Figure 11 thru Figure 28 PMBus Protocols PMBus Command Summary PMBus Commands Dual 25A PSM Applications Information VIN to VOUT Step-Down Ratios Input Capacitors Output Capacitors Light Load Current Operation Switching Frequency and Phase Output Current Limit Programming Minimum On-Time Considerations Variable Delay Time, Soft-Start and Output Voltage Ramping Digital Servo Mode Soft Off (Sequenced Off) Undervoltage Lockout Fault Detection and Handling Open-Drain Pins Phase-Locked Loop and Frequency Synchronization Input Current Sense Amplifier Programmable Loop Compensation Checking Transient Response PolyPhase® Configuration Connecting the USB to I2C/SMBus/PMBus Controller to the LTM4664 In-System LTpowerPlay: An Interactive GUI for Digital Power PMBus Communication and Command Processing Thermal Considerations and Output Current Derating Table 10 and Table 11: Output Current Derating (Based on Demo Board) Dual 25A PSM Applications Information–Derating Curves EMI Performance Safety Considerations Layout Checklist/Example Typical Applications PMBus Command Details Addressing and Write Protect General Configuration Commands On/Off/Margin PWM Configuration Voltage Input Voltage and Limits Output Voltage and Limits Output Current and Limits Input Current and Limits Temperature External Temperature Calibration Timing Timing—On Sequence/Ramp Timing—Off Sequence/Ramp Precondition for Restart Fault Response Fault Responses All Faults Fault Responses Input Voltage Fault Responses Output Voltage Fault Responses Output Current Fault Responses IC Temperature Fault Responses External Temperature Fault Sharing Fault Sharing Propagation Fault Sharing Response Scratchpad Identification Fault Warning and Status Telemetry NVM Memory Commands Store/Restore Fault Logging Block Memory Write/Read Package Description Typical Applications Related Parts