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LT1767: Monolithic 1.5A, 1.25MHz Step-Down Switching Regulators Data Sheet11/7/2014PDF430K
Overview
Features and Benefits
- 1.5A Switch in a Small MSOP Package
- Constant 1.25MHz Switching Frequency
- High Power Exposed Pad (MS8E) Package
- Wide Operating Voltage Range: 3V to 25V
- High Efficiency 0.22Ω Switch
- 1.2V Feedback Reference Voltage
- Fixed Output Voltages of 1.8V, 2.5V, 3.3V, 5V
- 2% Overall Output Tolerance
- Uses Low Profile Surface Mount Components
- Low Shutdown Current: 6μA
- Synchronizable to 2MHz
- Current Mode Loop Control
- Constant Maximum Switch Current Rating at All Duty Cycles*
Product Details
The LT1767 is a 1.25MHz monolithic buck switching regulator. A high efficiency 1.5A, 0.22Ω switch is included on the die together with all the control circuitry required to complete a high frequency, current mode switching regulator. Current mode control provides fast transient response and excellent loop stability.
New design techniques achieve high efficiency at high switching frequencies over a wide operating range. A low dropout internal regulator maintains consistent performance over a wide range of inputs from 24V systems to Li-Ion batteries. An operating supply current of 1mA improves efficiency, especially at lower output currents. Shutdown reduces quiescent current to 6μA. Maximum switch current remains constant at all duty cycles. Synchronization allows an external logic level signal to increase the internal oscillator from 1.5MHz to 2MHz.
The LT1767 is available in an 8-pin MSOP fused lead-frame package and a low thermal resistance exposed pad package. Full cycle-by-cycle current limit and thermal shutdown are provided. High frequency operation allows the reduction of input and output filtering components and permits the use of chip inductors.
Applications
- DSL Modems
- Portable Computers
- Wall Adapters
- Battery-Powered Systems
- Distributed Power
Product Categories
Product Lifecycle
Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (1)
Documentation & Resources
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R388 Reliability Data3/26/2018PDF32 K
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DC502A - Demo Manual9/24/2009PDF235K
Tools & Simulations
LTspice
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LTspice Simulations
Models for the following parts are available in LTspice:
LT1767
LT1767-1.8
LT1767-2.5
LT1767-3.3
LT1767-5
Design Resources
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