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TPS62748 Datasheet(PDF) 10 Page - Texas Instruments

Part # TPS62748
Description  TPS62748 300 mA High Efficiency Buck Converter with Ultra-low Quiescent Current and Load Switch
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

TPS62748 Datasheet(HTML) 10 Page - Texas Instruments

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V ,
IN
V
OUT
t
softstart
V
IN
Step Down Operation
100%
Mode
100%
Mode
V
TH_100+
V
TH_100-
V
UVLO+
V
UVLO-
V
tracks V
OUT
IN
V
tracks V
OUT
IN
V
discharge
OUT
TPS62748
SLVSD37A – SEPTEMBER 2015 – REVISED OCTOBER 2015
www.ti.com
9.4 Device Functional Modes
9.4.1 Enable and Shutdown
The device is turned on with EN=high. With EN=low the device enters shutdown and turns off the load switch.
This pin must be terminated.
9.4.2 Device Start-up and Softstart
The device has an internal softstart to minimize input voltage drop during start-up. This allows the operation from
high impedance battery cells. Once the device is enabled the device starts switching after a typical delay time of
10ms. Then the softstart time of typical 700 µs begins with a reduced current limit of typical 150 mA. When this
time passed by the device enters full current limit operation. This allows a smooth start-up and the device can
start into full load current. Furthermore, larger output capacitors impact the start-up behaviour of the DC/DC
converter. Especially when the output voltage does not reach its nominal value after the typical soft-start time of
700 µs, has passed.
9.4.3 Automatic Transition Into No Ripple 100% Mode
Once the input voltage comes close to the output voltage, the DC/DC converter stops switching and enters 100%
duty cycle operation. It connects the output VOUT via the inductor and the internal high side MOSFET switch to
the input VIN, once the input voltage VIN falls below the 100% mode enter threshold, VTH_100-. The DC/DC
regulator is turned off, switching stops and therefore no output voltage ripple is generated. Since the output is
connected to the input, the output voltage follows the input voltage minus the voltage drop across the internal
high side switch and the inductor. Once the input voltage increases and trips the 100% mode exit threshold,
VTH_100+ , the DC/DC regulator turns on and starts switching again. See Figure 5 and Figure 18.
Figure 5. Automatic Transition into 100% Mode
10
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Product Folder Links: TPS62748


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