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| 型号： | TPS65054RSMT |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 电源管理 |
| 英文描述： | 6-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC32 |
| 封装： | 4 X 4 MM, 0.40 MM PITCH, GREEN, PLASTIC, QFN-32 |
| 文件页数： | 15/40页 |
| 文件大小： | 1234K |
| 代理商： | TPS65054RSMT |
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Enable
RESET
+
-
HYSTERESIS
THRESHOLD
tNRESET
THRESHOLD-HYSTERESIS
Comparator
Output(Internal)
Vbat
100ms
Delay
V
=1V
ref
RESET
THRESHOLD
RESET
SLVS710A – JANUARY 2007 – REVISED AUGUST 2007
Pulling the MODE pin high forces both converters to operate constantly in the PWM mode even at light load
currents. The advantage is the converters operate with a fixed frequency that allows simple filtering of the
switching frequency for noise sensitive applications. In this mode, the efficiency is lower compared to the power
save mode during light loads. For additional flexibility, it is possible to switch from power save mode to forced
PWM mode during operation. This allows efficient power management by adjusting the operation of the converter
to the specific system requirements.
To start up each converter independently, the device has a separate enable pin for each DC/DC converter and
for each LDO. If EN_DCDC1, EN_DCDC2, EN_LDO1, EN_LDO2, EN_LDO3, EN_LDO4 are set to high, the
corresponding converter starts up with soft start as previously described.
Pulling the enable pin low forces the device into shutdown, with a shutdown quiescent current as defined in the
electrical characteristics. In this mode, the P and N-Channel MOSFETs are turned-off, the and the entire internal
control circuitry is switched-off. If disabled, the outputs of the LDOs are pulled low by internal 350
resistors,
actively discharging the output capacitor. For proper operation, the enable pins must be terminated and must not
be left unconnected.
The TPS65051, TPS65052, TPS65054 and TPS65056 contain circuitry that can generate a reset pulse for a
processor with a 100 ms delay time. The input voltage at a comparator is sensed at an input called threshold.
When the voltage exceeds the threshold, the output goes high with a 100-ms delay time. A hysteresis can be
defined with an external resistor connected to the hysteresis input. This circuitry is functional as soon as the
supply voltage at VCC exceeds the undervoltage lockout threshold. Therefore, the TPS6505x has a shutdown
current (all DCDC converters and LDOs are off) of 9
μA in order to supply bandgap and comparator.
Figure 21. RESET Pulse Circuit
22
Copyright 2007, Texas Instruments Incorporated
Product Folder Link(s): TPS65050, TPS65051, TPS65052 TPS65054, TPS65056
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