The TD1720 is a voltage mode, fixed 300kHz switching
frequency, synchronous buck converter. The TD1720 allows
wide input voltage that is either a single 5~12V or two supply
voltage(s) for various applications. A power-on-reset (POR)
circuit monitors the VCC supply voltage to prevent wrong
logic controls. A builtin soft-start circuit prevents the output
voltages from overshoot as well as limits the input current.
An internal 0.8V temperature-compensated reference
voltage with high accuracy is designed to meet the
requirement of low output voltage applications. The TD1720
provides excellent output voltage regulations against load
current
variation.
The controller’s over-current protection monitors the output
current by using the voltage drop across the RDS(ON) of
low-side MOSFET, eliminating the need for a current sensing
resistor that features high efficiency and low cost. In addition,
the TD1720 also integrates excellent protection functions:
The over-voltage protection (OVP) , under- voltage protection
(UVP). OVP circuit which monitors the FB voltage to prevent
the PWM output from overvoltage,and UVP circuit which
monitors the FB voltage to prevent the PWM output from
under-voltage or short-circuit.The TD1720 is available in
SOP-8P and TDFN3x3-10 packages.
Features
Wide 5V to 12V Supply Voltage
Power-On-Reset Monitoring on VCC
Excellent Output Voltage Regulations 0.8V Internal
Reference ±1% Over-Temperature Range
Integrated Soft-Start
Voltage Mode PWM Operation with External
Compensation
Up to 90% Duty Ratio for Fast Transient Response
Constant Switching Frequency 300kHz ±10%
Drive Dual Low Cost N-MOSFETs with Adaptive
Dead-Time Control
50% Under-Voltage Protection
125% Over-Voltage Protection
Adjustable Over-Current Protection Threshold Using the
RDS(ON) of Low-Side MOSFET
Shutdown Control by COMP
Power Good Monitoring (TDFN-10 3mmx3mm Package
Only)
SOP-8P and TDFN3x3-10 Packages
Lead Free and Green Devices Available (RoHS Compliant)
Applications
Graphic Cards
DSL, Switch HUB
Wireless Lan
Notebook Computer
Mother Board
LCD Monitor/TV
