36V Operation 600mA Synchronous Step-Down DC/DC Converters with a Built-in Driver FET

The XC9705 series are 36V operation synchronous step-down DC/DC converter ICs with a built-in High side driver FET and Low side drive FET. The XC9705 series has an operating voltage range of 3.0V to 36.0V, a switching frequency can be selected from 1.2MHz and 2.2MHz, and by utilizing synchronous rectification, delivers stable voltage with high efficiency. The output voltage can be changed from 2.8V to 15.0V using an external resistor, so the same part number can be used for multiple power lines.

By connecting a resistor and capacitor to the EN/SS pin, the soft start time can be externally adjusted to be longer than the internal soft start. The power good function also monitors the state of the output voltage. This soft-start external adjustment and power good functions make it easy to configure the power supply sequence.

Over-current protection and thermal shutdown are built in as protection function, and it can be used safely.

Feature

Input Voltage Range 3.0V ~ 36.0V (Absolute Max 40.0V)
Surge Voltage 46.0V (Applied Time≦400ms)
Output Voltage Range 2.8V ~ 15.0V
FB Voltage 0.75V±1.5%
Output Current 600mA
Oscillation Frequency 1.2MHz, 2.2MHz
Quiescent Current 11μA
Control Methods PWM/PFM Control
Efficiency 90%@12V→5V, 300mA
Protection functions Current Limit
Thermal Shutdown
Functions Soft-start (external adjustment)
Power Good (USP-6C only)
Output Capacitor Ceramic Capacitor
Operating Junction Temperature -40℃ ~ 150℃

Typical Application Circuit

Technical Document

Packages

Package Number of Pins Pcs/Reel Package Size(mm)
SOT-89-5 5 1,000 4.5 x 4.6 x 1.6
USP-6C 6 3,000 1.8 x 2.0 x 0.6

Evaluation Board

Series Name Evaluation Board No. Evaluation Board details Evaluation Board data Online Store
XC9705 Bare Board
XC9705-SOT-89-5-BB

36V 100% duty step-down DC/DC
Vin: 3.0V ~ 36.0V
Vout: 2.8V ~ 18.0V
Iout: 600mA
fosc: 1.2MHz, 2.2MHz
Control method: F-PWM
Vout adjustment method: External resistance

Package : SOT-89-5
TOREX Direct

XC9705 Series Part Numbers

Part number Sample FB Voltage Oscillation Frequency Packages EDA Online Store
XC9705B75CPR-G 0.75V 1.2MHz SOT-89-5
XC9705B75DPR-G 0.75V 2.2MHz SOT-89-5
XC9705B75CER-G 0.75V 1.2MHz USP-6C
XC9705B75DER-G 0.75V 2.2MHz USP-6C

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