LTC1700 - LTC1700是No R_SENSE Synchronous Step-Up DC/DC Controller

LTC1700是LINEAR凌力尔特公司的一款外部开关电源升压产品，LTC1700是LTC1700是No R_SENSE Synchronous Step-Up DC/DC Controller，本站介绍了LTC1700的封装应用图解、特点和优点、功能等，并给出了与LTC1700相关的LINEAR元器件型号供参考。

LTC1700 - LTC1700是No R_SENSE Synchronous Step-Up DC/DC Controller - 外部开关电源升压 - 电源管理 - 凌力尔特

LTC1700 - No R_SENSE Synchronous Step-Up DC/DC Controller

LTC1700 - No R_SENSE Synchronous Step-Up DC/DC Controller - Linear Technology（凌力尔特）

功能描述

The LTC1700 is a current mode synchronous step-up DC/DC controller that drives external N-channel and P-channel power MOSFETs using a constant frequency PWM architecture. Current limiting is provided by sensing the voltage drop across the main MOSFET, eliminating the need of a sense resistor. This No RSENSETM technique helps the LTC1700 maintain high efficiency at heavy loads while Burst Mode operation ensures high efficiency at light loads, thus providing high efficiencies over a wide range of load currents.

The LTC1700 operates at a minimum input voltage as low as 0.9V. The device boasts a ±1.5% output voltage accuracy and consumes only 200μA of quiescent current. In shutdown, it only draws 10μA.

To prevent inductor current runaway, the duty cycle is limited to 90%. Overvoltage protection is also provided which shuts both the external MOSFETs off when tripped.

High constant operating frequency of 530kHz allows the use of small inductors and output capacitors. The LTC1700 can also be synchronized between 400kHz to 750kHz. Burst Mode operation is inhibited when the device is externally clocked or when the SYNC/MODE pin is pulled low to reduce noise and RF interference.

特点

High Efficiency: Up to 95%

No Current Sense Resistor Required

Constant Frequency 530kHz Operation Allows Small Size, Surface Mount Inductors

OPTI-LOOP Compensation Minimizes COUT

Selectable Burst Mode Operation

Minimum Start-Up Voltage as Low as 0.9V

Synchronizable Between 400kHz and 750kHz

Micropower Shutdown: 10μA

Current Mode Operation for Excellent Line and Load Transient Response

Soft-Start Reduces Supply Current Transients

1.5% Output Voltage Accuracy