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TPS61252DGST Datasheet(PDF) 11 Page - Texas Instruments

No. de Pieza. TPS61252DGST
Descripción  TPS61252 Tiny 1.5-A Boost Converter With Adjustable Input Current Limit
Descarga  27 Pages
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Fabricante  TI1 [Texas Instruments]
Página de inicio  http://www.ti.com
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TPS61252DGST Datasheet(HTML) 11 Page - Texas Instruments

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(
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OUT
IN
DS(on)
OUT
V
V
DCR
r
I
=
-
+
g
TPS61252
www.ti.com
SLVSAG3A – SEPTEMBER 2010 – REVISED DECEMBER 2014
Feature Description (continued)
10.3.9 Thermal Regulation
The TPS61252 contains a thermal regulation loop that monitors the die temperature. If the die temperature rises
to values above 110 °C, the device automatically reduces the current limit to prevent the die temperature from
further increasing. Once the die temperature drops about 10 °C below the threshold, the device automatically
increases the current to the set value. This function also reduces the current during a short-circuit-condition.
10.3.10 Thermal Shutdown
As soon as the junction temperature, TJ, exceeds 140°C (typical), the device enters thermal shutdown. In this
mode, the High Side and Low Side MOSFETs are turned-off. When the junction temperature falls about 20 °C
below the thermal shutdown, the device resumes operation.
10.4 Device Functional Modes
10.4.1 Power Save Mode
The TPS61252 integrates a power save mode to improve efficiency at light load. In power save mode the
converter only operates when the output voltage trips below a set threshold voltage. It ramps up the output
voltage with several pulses and goes into power save mode again once the output voltage exceeds the set
threshold voltage. During the power save operation when the output voltage is above the set threshold, the
converter turns off some of the inner circuits to save energy.
Figure 8. Power Save Mode
The PFM mode is left and PWM mode entered, in case the output current can no longer be supported in PFM
mode.
10.4.2 100% Duty-Cycle Mode
If VIN > VOUT, the TPS61252 offers the lowest possible input-to-output voltage difference while still maintaining
current limit operation with the use of the 100% duty-cycle mode. In this mode, the high-side switch is constantly
turned on. During this operation, the output voltage follows the input voltage and will not fall below the
programmed value if the input voltage decreases below VOUT. The output voltage drop during 100% mode
depends on the load current and input voltage, and is calculated as:
where
DCR is the DC resistance of the inductor
rDS(on) is the typical on-resistance of the high-side switch
(4)
If the load current exceeds the set current limit, the resistance of the high-side switch increases to limit the
current and the output voltage drops.
Copyright © 2010–2014, Texas Instruments Incorporated
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