Datasheet Texas Instruments HPA00443PWPR — 数据表

TPS54283, TPS54286
www.ti.com SLUS749C – JULY 2007 – REVISED OCTOBER 2007 2-A DUAL NON-SYNCHRONOUS CONVERTER WITH INTEGRATED HIGH-SIDE MOSFET
FEATURES CONTENTS 1 4.5-V to 28-V Input Range Output Voltage Range 0.8 V to 90% of Input
Voltage Output Current Up to 2 A Two Fixed Switching Frequency Versions:
– TPS54283: 300 kHz
– TPS54286: 600 kHz Two Selectable Levels of Overcurrent
Protection (Output 2) 0.8-V 1.5% Voltage Reference 2.1-ms Internal Soft Start Dual PWM Outputs 180В° Out-of-Phase Ratiometric or Sequential Startup Modes
Selectable by a Single Pin 100-mΩ Internal High-Side MOSFETs Current Mode Control Internal Compensation (See Page 16) Pulse-by-Pulse Overcurrent Protection Thermal Shutdown Protection at 148°C 14-Pin PowerPAD™ HTSSOP package
23 2 Electrical Characteristics 3 Device Information 9 Application Information 12 Design Examples 32 Additional References 44 DESCRIPTION
TPS54283 and TPS54286 are dual output
non-synchronous buck converters capable of
supporting 2-A output applications that operate from a
4.5-V to 28-V input supply voltage, and require output
voltages between 0.8 V and 90% of the input voltage.
With internally-determined operating frequency, soft
start time, and control loop compensation, these
converters provide many features with a minimum of
external components. Channel 1 overcurrent
protection is set at 3 A, while Channel 2 overcurrent
protection level is selected by connecting a pin to
ground, to BP, or left floating. The setting levels are
used to allow for scaling of external components for
applications not needing the full load capability of …