Datasheet AD8452 (Analog Devices) - 6

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Data Sheet AD8452 PULSE-WIDTH MODULATOR SPECIFICATIONS Table 2. Parameter Test Conditions/Comments Min Typ Max Unit
SOFT START (SS) SS Pin Current VSS = 0 V 4 5 6 µA SS Threshold Rising Switching enable threshold 0.52 0.65 V SS Threshold Falling Switching disable threshold 0.4 0.5 V End of Soft Start Asynchronous to synchronous threshold 4.4 4.5 4.6 V PWM CONTROL Frequency Frequency Range RFREQ = 33.2 kΩ to 200 kΩ 50 300 kHz Oscillator Frequency RFREQ = 100 kΩ 90 100 110 kHz FREQ Pin Voltage RFREQ = 100 kΩ 1.1 1.255 1.4 V SYNC Output (Internal Frequency VSCFG ≥ 4.53 V or SCFG pin floating Control) Internal SYNC Range For SYNC output 50 300 kHz SYNC Output Clock Duty Cycle VSCFG = VVREG, RFREQ = 100 kΩ 40 50 60 % SYNC Sink Pull Down Resistance VSCFG = 5 V, ISYNC = 10 mA 10 20 Ω SYNC Input (External Frequency Control) VSCFG < 4.25 V External SYNC Range For SYNC input clock 50 300 kHz SYNC Internal Pull-Down Resistor 0.5 1 1.5 MΩ Maximum SYNC Pin Voltage For external sync operation 5 V SYNC Threshold Rising 1.2 1.5 V SYNC Threshold Falling 0.7 1.05 V SCFG SCFG High Threshold Rising SYNC set to input 4.53 4.7 V Falling SYNC set to output 4.25 4.47 V SCFG Low Threshold Rising Programmable phase shift above threshold 0.55 0.65 V Falling No phase shift 0.4 0.5 V SCFG Pin Current RFREQ = 100 kΩ, VSCFG = DGND 10 11 12 µA DMAX Maximum Internal Duty Cycle VDMAX, VSS, and VSCFG = 5 V 97 % DMAX Setting Current VDMAX = 0 V, RFREQ = 100 kΩ 10 11 12 µA DMAX and SCFG Current Matching1 10 % DT DT Pin Current RFREQ = 100 kΩ, VDT = DGND 20 24 µA Maximum DT Programming Voltage See Figure 28 3.5 V CURRENT LIMIT (CL) CLVT CLVT Pin Current Minimum CLVT pin voltage = 50 mV 16 21 27 µA CLP, CLN Common-Mode Range VCLP = VCLN 0 8 V Input Resistance 24 30 36 kΩ Current Limit Threshold Offset VCLP = VCLN, RCLVT = 2.49 kΩ 50 mV CLFLG Open-drain, active low output Max CLFLG Voltage Open-drain output 5.5 V CFLG Pull-Down Resistance 8 Ω Current Limit RFREQ = 100 kΩ, 16 consecutive clock pulses Overload Time 160 μs Cool Down Time 160 μs Rev. 0 | Page 5 of 34 Document Outline Features Applications General Description Functional Block Diagram Table of Contents Revision History Specifications Analog Front-End and Controller Specifications Pulse-Width Modulator Specifications Digital Interface Specifications Power Supply Temperature Range Specifications Absolute Maximum Ratings Thermal Resistance ESD Caution Pin Configuration and Function Descriptions Typical Performance Characteristics In-Amp Characteristics Difference Amplifier Characteristics CC and CV Loop Filter Amplifiers and VSET Buffer (except where Noted) Reference Characteristics Pulse-Width Modulator Theory of Operation Introduction Instrumentation Amplifier (In-Amp) Reversing Polarity When Charging and Discharging In-Amp Offset Option Battery Reversal and Overvoltage Protection Difference Amplifier CC and CV Loop Filter Amplifiers Charging Lithium-Ion (Li-Ion) Cells Concepts of Constant Current (CC) and Constant Voltage (CV) Compensation Charge and Discharge Control Conditions to Charge and Discharge a Battery MODE Pin Input and Output Supply Pins Shutdown Undervoltage Lockout (UVLO) Soft Start PWM Drive Signals Peak Current Protection and Diode Emulation (Synchronous) Peak Current-Limit Detection Diode Emulation/Synchronous Mode Operation Frequency and Phase Control Internal Frequency Control External Frequency Control Operating Frequency Phase Shift Maximum Duty Cycle Fault Input Thermal Shutdown (TSD) Applications Information Analog Controller Functional Description Power Supply Connections Current Sense In-Amp Connections Current Sensors Optional Low-Pass Filter Voltage Sense Differential Amplifier Connections Battery Current and Voltage Control Inputs (ISET and VSET) Loop Filter Amplifiers Selecting Charge or Discharge Options Select RCL and RCLVT for the Peak Current Limit Setting the Operating Frequency and Programming the Synchonization Pin Select RFREQ for Standalone or Master Clock Selecting RFREQ for a Slave Device Programming the External Clock Phase Shift Programming the Dead Time Programming the Maximum Duty Cycle Selecting CSS Additional Information Outline Dimensions Ordering Guide