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LM34910SD/NOPB
8-36V, 1.25A Constant On-Time Non-Synchronous Buck Regulator 10-WSON -40 to 125
BST
ISEN
SGND
RTN
RON/SD 1
VCC
VIN
LM34910
www.ti.com SNVS297B –OCTOBER 2004–REVISED MARCH 2013
LM34910 High Voltage (40V, 1.25A) Step Down Switching Regulator
Checkfor Samples: LM34910
1FEATURES DESCRIPTIONThe LM34910 Step Down Switching Regulator
Integrated 40V, N-Channel Buck Switch featuresallof the functions neededto implementa
• Integrated Start-Up Regulator low cost, efficient, buck bias regulator capableof
Input Voltage Range: 8Vto 36V supplying 1.25A to the load. This buck regulator
containsa 40V N-Channel Buck Switch, andis
• No Loop Compensation Required available in the thermally enhanced WSON-10
• Ultra-Fast Transient Response package. The hysteretic regulation scheme requires
• Operating Frequency Remains Constant with no loop compensation, resultsin fast load transient
Load Current and Input Voltage response, and simplifies circuit implementation. The
operating frequency remains constant with line and
• Maximum Duty Cycle Limited During Start-Up load variations due to the inverse relationship
• Adjustable Output Voltage between the input voltage and the on-time. The
• Valley Current LimitAt 1.25A current limit detectionis set at 1.25A. Additional
features include: VCC under-voltage lockout, thermal
• Precision Internal Reference shutdown, gate drive under-voltage lockout, and
• Low Bias Current maximum duty cycle limiter.
• Highly Efficient Operation Thermal Shutdown Package WSON-10(4 mmx4 mm)
TYPICAL APPLICATIONS • Exposed Thermal Pad For Improved Heat
Dissipation
• High Efficiency Point-Of-Load (POL) Regulator Non-Isolated Telecommunication Buck
Regulator Secondary High Voltage Post Regulator
Connection Diagram1. 10-Lead DPR0010A
