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TPS61010 Datasheet(PDF) 6 Page - Texas Instruments

Part # TPS61010
Description  HIGH-EFFICIENCY, 1-CELL AND 2-CELL BOOST CONVERTERS
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

TPS61010 Datasheet(HTML) 6 Page - Texas Instruments

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DGS
(TOP VIEW)
DRC
(TOP VIEW)
1
2
3
4
5
10
9
8
7
6
EN
COMP
FB
GND
VOUT
LBO
LBI
ADEN
SW
VBAT
FB
GND
VOUT
VBAT
LBI
COMP
SW
ADEN
EN
LBO
DETAILED DESCRIPTION
Controller Circuit
Synchronous Rectifier
TPS61010, TPS61011
TPS61012, TPS61013
TPS61014, TPS61015, TPS61016
SLVS314D – SEPTEMBER 2000 – REVISED JUNE 2005
Terminal Functions
Terminal
I/O
Description
DRG
DRC
Name
No.
No.
Autodischarge input. The autodischarge function is enabled if this pin is connected to VBAT, it is disabled
ADEN
8
8
I
if ADEN is tied to GND.
COMP
2
2
I
Compensation of error amplifier. Connect an R/C/C network to set frequency response of control loop.
1
I
Chip-enable input. The converter is switched on if this pin is set high, it is switched off if this pin is
EN
1
connected to GND.
Feedback input for adjustable output voltage version TPS61010. Output voltage is programmed
FB
3
3
I
depending on the output voltage divider connected there. For the fixed output voltage versions, leave
FB-pin unconnected.
GND
4
4
Ground
Low-battery detector input. A low battery warning is generated at LBO when the voltage on LBI drops
LBI
9
9
I
below the threshold of 500 mV. Connect LBI to GND or VBAT if the low-battery detector function is not
used. Do not leave this pin floating.
Open-drain low-battery detector output. This pin is pulled low if the voltage on LBI drops below the
LBO
10
10
O
threshold of 500 mV. A pullup resistor must be connected between LBO and VOUT.
SW
7
7
I
Switch input pin. The inductor is connected to this pin.
VOUT
5
5
O
Output voltage. Internal resistor divider sets regulated output voltage in fixed output voltage versions.
VBAT
6
6
I
Supply pin
The device is based on a current-mode control topology using a constant frequency pulse-width modulator to
regulate the output voltage. The controller limits the current through the power switch on a pulse by pulse basis.
The current-sensing circuit is integrated in the device, therefore, no additional components are required. Due to
the nature of the boost converter topology used here, the peak switch current is the same as the peak inductor
current, which will be limited by the integrated current limiting circuits under normal operating conditions.
The control loop must be externally compensated with an R-C-C network connected to the COMP-pin.
The device integrates an N-channel and a P-channel MOSFET transistor to realize a synchronous rectifier. There
is no additional Schottky diode required. Because the device uses a integrated low rDS(on) PMOS switch for
rectification, the power conversion efficiency reaches 95%.
A special circuit is applied to disconnect the load from the input during shutdown of the converter. In conventional
synchronous rectifier circuits, the backgate diode of the high-side PMOS is forward biased in shutdown and
allows current flowing from the battery to the output. This device, however, uses a special circuit to disconnect
the backgate diode of the high-side PMOS and so, disconnects the output circuitry from the source when the
regulator is not enabled (EN = low).
The benefit of this feature for the system design engineer, is that the battery is not depleted during shutdown of
the converter. So, no additional effort has to be made by the system designer to ensure disconnection of the
battery from the output of the converter. Therefore, design performance will be increased without additional costs
and board space.
6


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