So happy to get this good order from our italy customer. They purchased Switching Voltage Regulators and OR Controller Source Selector Switch produced by ADI from us.
1. Part Number : MAX1797EUA+T
Function : Step-Up
Output Configuration : Positive
Topology : Boost
Output Type : Adjustable (Programmable)
Number of Outputs : 1
Voltage - Input (Min) : 1V
Voltage - Input (Max) : 5.5V
Voltage - Output (Min/Fixed) : 2V (3.3V, 5V)
Voltage - Output (Max) : 5.5V
Current - Output : 800mA (Switch)
Frequency - Switching : 500kHz
Synchronous Rectifier: Yes
Operating Temperature: -40°C ~ 85°C (TA)
Applications :
· Portable Digital Audio Players
· PDAs/Palmtops
· Wireless Handsets
· Portable Terminals
Features :
① > 95% Efficiency
② True-Shutdown Circuitry
• Output Disconnects from Input in Shutdown
• No External Schottky Diode Needed
③ 25μA Quiescent Supply Current
④ Low-Noise Antiringing Feature
⑤ LBI/LBO Comparator Enabled in Shutdown
⑥ 2μA Shutdown Current
⑦ 8-Pin μMAX Package
The MAX1797 is high-efficiency, step-up DC-DC converters intended for small portable hand-held devices. These devices feature Maxim’s True Shutdown™ circuitry, which fully disconnects the output from the input in shutdown, improves efficiency, and eliminates costly external components. All three devices also feature Maxim’s proprietary LX-damping circuitry for reduced EMI in noise-sensitive applications.
For additional in-system flexibility, a battery monitoring comparator (LBI/LBO) remains active even when the DC-DC converter is in shutdown
The input voltage range is +0.7V to VOUT, where VOUT can be set from +2V to +5.5V. Startup is guaranteed from +0.85V. The MAX1797 have a preset, pin-selectable 5V or 3.3V output. The output can also be adjusted to other voltages, using two external resistors. The three devices differ only in their current limits, allowing optimization of external components for different loads: The MAX1797 have current limits of 0.25A, 0.5A, and 1A, respectively.
All devices are packaged in a compact, 8-pin μMAX package that is only 1.09mm tall and half the size of an 8-pin SO.
The MAX1797 compact step-up DC-DC converters start-up with voltages as low as 0.85V and operate with an input voltage down to +0.7V.
Consuming only 25μA of quiescent current, these devices have an internal synchronous rectifier that reduces cost by eliminating the need for an external diode and improves overall efficiency by minimizing losses in the circuit.
The internal N-channel MOSFET power switch resistance is typically 0.17Ω, which minimizes losses. The LX switch current limits of the MAX1797 is 0.25A, 0.5A, and 1A, respectively.
Devices offer Maxim’s proprietary True Shutdown circuitry, which disconnects the output from the input in shutdown and puts the output in a high-impedance state. These devices also feature Maxim’s proprietary LX-damping circuitry, which reduces EMI in noise-sensitive applications. For additional in-system flexibility, the LBI/LBO comparator remains active in shutdown.
The MAX1797 each contain an internal damping switch to minimize ringing at LX. The damping switch connects a resistor across the inductor when the inductor’s energy is depleted. Normally, when the energy in the inductor is insufficient to supply current to the output, the capacitance and inductance at LX form a resonant circuit that causes ringing. The ringing continues until the energy is dissipated through the series resistance of the inductor. The damping switch supplies a path to quickly dissipate this energy, minimizing the ringing at LX. Damping LX ringing does not reduce VOUT ripple, but does reduce EMI
2. Part Number : LTC4412ES6#TRPBF
Type : Source Selector Switch
FET Type : P-Channel
Ratio - Input:Output : 2:1
Internal Switch(s) : No
Delay Time - ON : 110 µs
Delay Time - OFF : 13 µs
Current - Supply : 15 µA
Voltage - Supply : 2.5V ~ 28V
Application :
· Cellular Phones
· Notebook and Handheld Computers
· Digital Cameras
· USB-Powered Peripherals
· Uninterruptible Power Supplies
· Logic Controlled Power Switch
Faetures :
· Very Low Loss Replacement for Power Supply OR’ing Diodes
· Minimal External Components
· Automatic Switching Between DC Sources
· Simplifies Load Sharing with Multiple Batteries
· Low Quiescent Current: 11µA
· 3V to 28V AC/DC Adapter Voltage Range
· 2.5V to 28V Battery Voltage Range
· Reverse Battery Protection
· Drives Almost Any Size MOSFET for Wide Range of Current Requirements
· MOSFET Gate Protection Clamp
· Manual Control Input
· Low Profile (1mm) ThinSOT™ Package
· AEC-Q100 Qualified for Automotive Applications
The LTC®4412 controls an external P-channel MOSFET to create a near ideal diode function for power switchover or load sharing. This permits highly efficient OR’ing of multiple power sources for extended battery life and low self-heating. When conducting, the voltage drop across the MOSFET is typically 20mV. For applications with a wall adapter or other auxiliary power source, the load is automatically disconnected from the battery when the auxiliary source is connected. Two or more LTC4412s may be interconnected to allow load sharing between multiple batteries or charging of multiple batteries from a single charger.
The wide supply operating range supports operation from one to six Li-Ion cells in series. The low quiescent current (11µA typical) is independent of the load current.
The gate driver includes an internal voltage clamp for MOSFET protection.
The STAT pin can be used to enable an auxiliary P-channel MOSFET power switch when an auxiliary supply is detected. This pin may also be used to indicate to a microcontroller that an auxiliary supply is connected. The control (CTL) input enables the user to force the primary MOSFET off and the STAT pin low.
The LTC4412 is available in a low profile (1mm) ThinSOT package.
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Main brand: Maxim,Analog Device, Xilinx,Microchip, Texas Instruments,STM, Yageo,Murata, Samsung,Kemet, TDK,AVX, Molex
Support:
1. One Year Guarantee for all parts
2. Free shipping for the first order within 2kg
3. Mini order from 1 pcs
4. Short lead time, Quick delivery
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