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TPS68402A0RHFR Datasheet(PDF) 8 Page - Texas Instruments

No. de pieza TPS68402A0RHFR
Descripción Electrónicos  MULTIFUNCTION 3-CHANNEL LED DRIVERS
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Fabricante Electrónico  TI1 [Texas Instruments]
Página de inicio  http://www.ti.com
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TPS68402A0RHFR Datasheet(HTML) 8 Page - Texas Instruments

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REG
1x/1.5x
C/P
WEAK 1x
CP _MODE [ 1:0]
CP _MODE [ 1:0] = OFF
COUT
VOUT
VDD
CIN
BYPASS
TPS68401, TPS68402
SLVSA68A – MARCH 2010 – REVISED JANUARY 2011
www.ti.com
DESCRIPTION OF CHARGE PUMP OPERATION
The TPS68401/TPS68402 includes a regulated fractional charge pump with bypass mode. It is used to boost the
supply voltage for the output drivers when the battery voltage is close to or below the forward bias voltage of the
LEDs. In 1.5x mode VOUT is boosted to 1.5x VDD or 4.55 V, whichever value is lower. In 1x (bypass) mode the
output is connected directly to the input supply.
The charge pump is controlled with two CP_MODE bits in the CONFIG register. When disabled, VOUT is
connected to ground through a 300-k
Ω resistive path. The user can manually select 1x and 1.5x mode or select
automatic mode. When automatic mode is enabled, the charge pump will operate in bypass mode as long as the
input supply voltage is sufficient to drive the LEDs. Dropout voltage of all three channels is monitored and charge
pump gain is set to 1.5x if any one driver does not have enough headroom to drive the LED. When the part
enters Power Save mode the output capacitor is connected to the input supply through a resistive path. See
Power Save mode description for details.
The mode selection logic utilizes digital filtering to prevent glitches of the supply voltage from triggering gain
changes. If R-driver current source is connected to battery (CONFIG register, bit R_TO_BATT set to 1) voltage
monitoring is disabled in R output, but still functional in G and B output.
Figure 1. Functional Model of Charge Pump
8
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Product Folder Link(s): TPS68401 TPS68402


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