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TPS68402A0RHFR Datasheet(PDF) 8 Page - Texas Instruments |
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TPS68402A0RHFR Datasheet(HTML) 8 Page - Texas Instruments |
8 / 37 page 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 Submit Documentation Feedback Copyright © 2010–2011, Texas Instruments Incorporated Product Folder Link(s): TPS68401 TPS68402 |
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