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TPS62052DGSR Datasheet(PDF) 9 Page - Texas Instruments

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Part # TPS62052DGSR
Description  800-mA Synchronous Step-Down Converter
Download  30 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

TPS62052DGSR Datasheet(HTML) 9 Page - Texas Instruments

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background image
FB
PG
VIN
8
LBO
GND
SYNC
EN
LBI
PGND
TPS62051
SW
1
6
7
3
2
9
5
4
10
R3
R4
R1
R2
R5
R6
R7
1 Cell Li-lon
Ci = 10 µF
L1 = 10
µH
VO = 2.5 V / 600 mA
Co = 22 µF
C(ff) =
6.8 pF
LBI
ENABLE
LBO
VIN
Bandgap
LBI
Comparator
Enable to Internal Circuitry
TPS62050, TPS62051, TPS62052, TPS62054, TPS62056
www.ti.com
SLVS432F – SEPTEMBER 2002 – REVISED JUNE 2015
Feature Description (continued)
9.3.3 ENABLE / Low-Battery Detector (Enhanced Version) TPS62051 Only
The TPS62051 device offers an enhanced LBI functionality to provide a precise, user-programmable
undervoltage shutdown. No additional supply voltage supervisor (SVS) is needed to provide this function.
When the enable (EN) pin is pulled high, only the internal bandgap voltage reference is switched on to provide a
reference source for the LBI comparator. As long as the voltage at LBI is less than the LBI trip point, all other
internal circuits are shut down, reducing the supply current to 5 µA. As soon as input voltage at LBI rises above
the LBI trip point of 1.21 V, the device is completely enabled and starts switching.
Figure 4. Block Diagram of ENABLE / LBI Functionality for TPS62051
The logic level of the LBO pin is not defined for the first 500 µs after EN is pulled high.
When the enhanced LBI is used to supervise the battery voltage and shut down the TPS62051 at low input
voltages, the battery voltage rises again when the current drops to zero. The implemented hysteresis on the LBI
pin may not be sufficient for all types of batteries. Figure 5 shows how an additional external hysteresis can be
implemented.
Figure 5. Enhanced LBI With Increased Hysteresis
A MATHCAD® file to calculate R7 can be downloaded from the product folder on the TI web.
9.3.4 Undervoltage Lockout
The undervoltage lockout (UVLO) circuit prevents the device from misoperation at low input voltages. The circuit
prevents the converter from turning on the switch or rectifier MOSFET under undefined conditions.
Copyright © 2002–2015, Texas Instruments Incorporated
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9
Product Folder Links: TPS62050 TPS62051 TPS62052 TPS62054 TPS62056


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