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TPS43335-Q1 Fiches technique(PDF) 11 Page - Texas Instruments

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No de pièce TPS43335-Q1
Description  LOW IQ, SINGLE BOOST, DUAL SYNCHRONOUS BUCK CONTROLLER
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Fabricant  TI1 [Texas Instruments]
Site Internet  http://www.ti.com
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TPS43335-Q1
TPS43336-Q1
www.ti.com
SLVSAV6B – JUNE 2011 – REVISED JULY 2012
PIN FUNCTIONS (continued)
NAME
NO.
I/O
DESCRIPTION
Soft-start or tracking input for buck controller BuckB. The buck controller regulates the FBB voltage to the lower of
0.8 V or the SSB pin voltage. An internal pullup current source of 1 µA is present at the pin, and an appropriate
SSB
25
O
capacitor connected here can be used to set the soft-start ramp interval. A resistor-divider connected to another
supply can also be used to provide a tracking input to this pin.
If an external clock is present on this pin, the device detects it and the internal PLL locks onto the external clock.
This overrides the internal oscillator frequency. The device can synchronize to frequencies from 150 kHz to 600
kHz. A high logic level on this pin ensures forced continuous-mode operation of the buck controllers and inhibits
SYNC
20
I
transition to low-power mode. An open or low allows discontinuous mode operation and entry into low-power
mode at light loads. On the TPS43332, a high level enables frequency-hopping spread spectrum, whereas an
open or a low level disables it.
Battery input sense for the boost controller. If the boost controller is enabled and the voltage at VBAT falls below
VBAT
1
I
the boost threshold, the device activates the boost controller and regulates the voltage at VIN to the programmed
boost output voltage.
Main Input pin. This is the buck controller input pin as well as the output of the boost regulator. Additionally, it
VIN
38
I
powers the internal control circuits of the device.
An external capacitor on this pin is required to provide a regulated supply for the gate drivers of the buck and
boost controllers. A capacitance in the order of 4.7 µF is recommended. The regulator can be used such that it is
VREG
35
O
either powered from VIN or EXTSUP. This pin has current-limit protection and should not be used to drive any
other loads.
Copyright © 2011–2012, Texas Instruments Incorporated
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