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TLV62569 Datasheet(PDF) 7 Page - Texas Instruments

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Part # TLV62569
Description  2-A High Efficiency Synchronous Buck Converter in SOT Package
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

TLV62569 Datasheet(HTML) 7 Page - Texas Instruments

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Control Logic
Soft Start
Thermal
Shutdown
UVLO
Gate
Drive
GND
FB
EN
SW
Modulator
TOFF
GND
Zero Current Detect
Peak Current Detect
+
_
VREF
VSW
VIN
+
±
GND
VPG
VFB
VIN
PG
Power Good feature is only available in TLV62569P
Copyright Ú 2016, Texas Instruments Incorporated
7
TLV62569, TLV62569P
www.ti.com
SLVSDG1B – DECEMBER 2016 – REVISED JUNE 2017
Product Folder Links: TLV62569 TLV62569P
Submit Documentation Feedback
Copyright © 2016–2017, Texas Instruments Incorporated
7 Detailed Description
7.1 Overview
The TLV62569 is a high-efficiency synchronous step-down converter. The device operates with an adaptive off
time with peak current control scheme. The device operates at typically 1.5-MHz frequency pulse width
modulation (PWM) at moderate to heavy load currents. Based on the VIN/VOUT ratio, a simple circuit sets the
required off time for the low-side MOSFET. It makes the switching frequency relatively constant regardless of the
variation of input voltage, output voltage, and load current.
7.2 Functional Block Diagrams
Figure 4. TLV62569 Functional Block Diagram
7.3 Feature Description
7.3.1 Power Save Mode
The device automatically enters Power Save Mode to improve efficiency at light load when the inductor current
becomes discontinuous. In Power Save Mode, the converter reduces switching frequency and minimizes current
consumption. In Power Save Mode, the output voltage rises slightly above the nominal output voltage. This effect
is minimized by increasing the output capacitor.
7.3.2 100% Duty Cycle Low Dropout Operation
The device offers a low input-to-output voltage differential by entering 100% duty cycle mode. In this mode, the
high-side MOSFET switch is constantly turned on and the low-side MOSFET is switched off. The minimum input
voltage to maintain output regulation, depending on the load current and output voltage, is calculated as:
VIN(MIN) = VOUT + IOUT x (RDS(ON) + RL)
where
RDS(ON) = High side FET on-resistance
RL = Inductor ohmic resistance (DCR)
(1)


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