|Category||Power Management => Regulators => Switching Regulators|
|Description||Control Method = PWM ;; Operation Start Voltage = (Input 2.2-18 V) ;; Output Voltage = 2.5-6.0 V ;; Output Accuracy = - ;; Switching Frequency = 300 KHZ ;; Current Consumption Operating = 75 µA (Step-down) 900 µA (Step-up) ;; Current Consumption Shutdown = 2 µA Max. ;; Efficiency Typ. = 87% (Step-down) 83% (Step-up) ;; Package = 16-pin Tssop|
|Datasheet||Download S-8460B00AFT-TB datasheet
SINGLE-COIL PWM CONTROL STEP-UP/DOWN TYPE SWITCHING REGULATOR CONTROLLER
The is a PWM control step-up and step-down switching regulator-controller consisting of an automatic-selection control circuit for step-up and step-down, a reference voltage source, an oscillation circuit, an error amplifier, a phase compensation CMOS circuit, etc. The automatic-selection control circuit for step-up and step-down in PWM control realizes a high performance step-up and step-down switching regulator operating on one coil. Adopting Nchannel power MOS transistors for external switches, in addition, enables high efficiency and high output current. The S-8460 provides low-ripple output, high-efficiency and excellent transient characteristics which come from the PWM control circuit capable of varying the duty ratio linearly from 0%, the optimized error amplifier and the phase compensation circuit.Features
High-efficiency is achieved from one coil by automatic-selection control circuit. N-channel power MOS configuration for external switches realizes high-efficiency. Synchronous rectification at step-down operation 18.0 V Input voltage : Output voltage range 6.0 V Variable output voltage: Automatic-recovery overload protection circuit 300 kHz Oscillation frequency Soft-start function set by an external capacitor Css Power-off functionApplications
Power source for portable devices such as PDAs, electronic organizers, cellular phones. Main or local power source for notebook PCs and peripherals. Constant voltage source for cameras, video equipment and communication devices. Available from 2 dry battery cells and 1 lithium cell to AC adapter.
SINGLE-COIL PWM CONTROL STEP-UP/DOWN TYPE SWITCHING REGULATOR CONTROLLER Rev.1.1_00 S-8460 Block Diagram
SD1 SW1 BST CBST EXT1 LX VIN CIN VL EXT2 Voltage source Reference voltage with soft-start EXT3 SW3 COUT L VINRemark Diodes shown in the figure are parasitic diodes. Figure 1
SINGLE-COIL PWM CONTROL STEP-UP/DOWN TYPE SWITCHING REGULATOR CONTROLLER Rev.1.1_00 S-8460 Pin Configuration
Description IC Power supply pin *1 Power supply for boost ON/ OFF Power-off pin "H" : Normal operation (Step-up and -down) "L" : Halt (No step-up and -down) *2 4 VSS GND pin 5 CSS Capacitor connection for soft-start time 6 CPRO Capacitor connection for protection time 7 T Test pin, should be connected to GND NC No connection 9 FB pin NC No connection 11 EXT3 External transistor driving pin *2 12 DVSS Digital GND pin 13 EXT2 External transistor driving pin 14 LX Connection pin for coil 15 EXT1 External transistor driving pin 1 16 BST Boost capacitor connection for SW1 driving *1. No use except boosting this IC is allowed. *2. VSS pin and DVSS pin are internally short-circuited. *3. NC pin is electrically open. Connection of this pin to VIN or VSS is allowed.
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|S-8520 Control Method = Pwm, Pwm/pfm ;; Operation Start Voltage = (Input 2.5 to 10/16 V) ;; Output Voltage = 1.5-6.0V ;; Output Accuracy = ±2.4% ;; Switching Frequency = 60, 180, 300 KHZ ;; Current Consumption|