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参数资料
| 型号： | TPS65055RSMR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 1.8 A DUAL SWITCHING CONTROLLER, 2475 kHz SWITCHING FREQ-MAX, PQCC32 |
| 封装： | 4 X 4 MM, GREEN, PLASTIC, QFN-32 |
| 文件页数： | 13/41页 |
| 文件大小： | 1276K |
| 代理商： | TPS65055RSMR |
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Under-Voltage Lockout
ENABLE
discharge
threshold
Vbat
Vref=1V
+
-
Vbat
threshold
discharge
RST and DPD
SHORT-CIRCUIT PROTECTION
SLVS844 – SEPTEMBER 2008.......................................................................................................................................................................................... www.ti.com
The under voltage lockout circuit prevents the device from malfunctioning at low input voltages and from
excessive discharge of the battery and disables the converters and LDOs. The under-voltage lockout threshold is
typically 1.8 V.
The DCDC converters and the LDOs are enabled using external enable pins or enable bits with the I2C
compatible interface. The signal of the enable pin and the enable bit are logically XORed to generate the enable
signal to the converter or LDO. There is one enable pin and one enable bit for each of the LDOs or DCDC
converters, which allows start up of each converter independently. If EN_DCDC1, EN_DCDC2, EN_LDO1,
EN_LDO2, ENLDO3, or EN_LDO4 are set to high, the corresponding converter starts up with soft start as
previously described. The converters and LDOs can also be enabled by setting the enable bits for each of the
LDOs or DCDC converters in register REG_CTRL. See the register description for more details.
Disabling the DCDC converter or LDO 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, and the
entire internal control circuitry is switched-off. For proper operation the enable pins must be terminated and must
not be left floating.
The TPS65055 contains a comparator that supervises a voltage applied to the threshold pin and drives a open
drain NMOS according to the input level applied at threshold. If the input voltage at the threshold pin is lower
than 1V, the open drain NMOS at the discharge output is turned on, pulling the pin to GND. This circuitry is
functional as soon as the supply voltage at Vcc exceeds the undervoltage lockout threshold. Therefore the
TPS65055 has a shutdown current (all DCDC converters and LDOs are off) of 9
A in order to supply bandgap
and comparator.
The TPS65055 contains two open drain outputs that are controlled by the I2C compatible interface. The RST and
DPD outputs are low (internal NMOS active) per default, once the undervoltage lockout threshold has been
exceeded. The status of these outputs can be changed using the REG_CTRL register. See the register
description for more details.
All outputs are short-circuit protected with a maximum output current as defined in the electrical specifications.
20
Copyright 2008, Texas Instruments Incorporated
Product Folder Link(s): TPS65055
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