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TPS65040 Datasheet(PDF) 42 Page - Texas Instruments |
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TPS65040 Datasheet(HTML) 42 Page - Texas Instruments |
42 / 74 page PABIAS1 VOUT 4.2V 0.8V 0.40V 2.414V TPS65040 SLVS708B – NOVEMBER 2006 – REVISED APRIL 2007 DETAILED DESCRIPTION (continued) Because the DC/DC converter operates in buck/boost mode using only one external inductor, the output voltage can be programmed from 0.8 V to 4.2 V by an analog input voltage applied to terminal PABIAS1. The VOUT voltage is determined by: VOUT (V) = -1.688 × PABIAS1 (V) + 4.874 Figure 71 shows VOUT voltage vs PABIAS1 input. Figure 71. VOUT Voltage vs PABIAS1 Input The DC/DC converter output is enabled or disabled by TXONFST pin and the r[PSNCNTDC/DC] register bit (accessed via the serial I/F, default value = 1). When r[PSNCNTDC/DC] = 1, a high level on the TXONFST pin powers up the DC/DC converter. The output then rises to the voltage selected by the input voltage on the PABIAS1 pin. Note: At VBAT values outside the range specified in the recommended operating conditions table, the DC/DC converter must be turned off. The DC/DC converter ON/OFF options are shown in Table 1. Table 1. DC/C Converter (BKBT) ON/OFF Control REG_EN(1) VIO1V8(1) TXONFST r[PSCNTDC/DC] OUTPUT 1 1 1 1 ON 1 1 0 1 OFF 1 1 1 0 OFF 1 1 0 0 OFF 0 0 Don't Care Don't Care OFF 1 0 Don't Care Don't Care OFF (1) REG_EN and VIO1V8 sequence is described in the Sequence Control section. The EXT_DC_DC_ON_OFF pin can control an external DC/DC converter based on the states of the TXONFST pin, and r [PSCNTDC/DC_EXT]. r [PSCNTDC/DC_EXT] is 0 by default. The detail is described in the SERIAL INTERFACE Section. Table 2 shows Low/High control for an external DC/DC converter. Table 2. Low/High Control for External DC/DC Converter REG_EN(1) VIO1V8(1) TXONFST r[PSCNTDC/DC_EXT] EXT_DC_DC_ON_OFF 1 1 1 1 High 1 1 0 1 Low (1) REG_EN and VIO1V8 sequence is described in the Sequence Control section. 42 Submit Documentation Feedback |
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