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| 型号： | TPS65040ZQER |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 电源管理 |
| 英文描述： | 8-CHANNEL POWER SUPPLY MANAGEMENT CKT, PBGA71 |
| 封装： | 5 X 5 MM, 0.50 MM PITCH, GREEN, PLASTIC, MICRO, BGA-71 |
| 文件页数： | 37/73页 |
| 文件大小： | 1928K |
| 代理商： | TPS65040ZQER |
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PABIAS1
VOUT
4.2V
0.8V
0.40V
2.414V
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
ON
1
0
1
OFF
1
0
OFF
1
0
OFF
0
Don't Care
OFF
1
0
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
High
1
0
1
Low
(1)
REG_EN and VIO1V8 sequence is described in the Sequence Control section.
42
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