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| 型号： | TPS65023QRSBRQ1 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 电源管理 |
| 英文描述： | POWER SUPPLY SUPPORT CKT, PQCC40 |
| 封装： | 5 X 5 MM, GREEN, PLASTIC, WQFN-40 |
| 文件页数： | 14/54页 |
| 文件大小： | 1546K |
| 代理商： | TPS65023QRSBRQ1 |
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www.ti.com
SLVS927C – MARCH 2009 – REVISED MAY 2010
DETAILED DESCRIPTION
VRTC Output and Operation With or Without Backup Battery
The VRTC pin is an always-on output, intended to supply up to 30 mA to a permanently required rail (i.e., for a
real-time clock). The TPS65023 asserts the RESPWRON signal if VRTC drops below 2.4 V. VRTC is selected
from a priority scheme based on the VSYSIN and VBACKUP inputs.
When the voltage at the VSYSIN pin exceeds 2.65 V, VRTC connects to the VSYSIN input via a PMOS switch
and all other paths to VRTC are disabled. The PMOS switch drops a maximum of 375 mV at 30 mA, which
should be considered when using VRTC. VSYSIN can be connected to any voltage source with the appropriate
input voltage, including VCC or, if set to 3.3-V output, DCDC2 or DCDC3. When VSYSIN falls below 2.65 V or
shorts to ground, the PMOS switch connecting VRTC and VSYSIN opens and VRTC then connects to either
VBACKUP or the output of a dedicated 3-V/30-mA LDO. Texas Instruments recommends connecting VSYSIN to
VCC or ground - VCC if a non-replaceable primary cell is connected to VBACKUP and ground if the VRTC
output will float.
If the PMOS switch between VSYSIN and VRTC is open and VBACKUP exceeds 2.65 V, VRTC connects to
VBACKUP via a PMOS switch. The PMOS switch drops a maximum of 375 mV at 30 mA, which should be
considered if using VRTC. A typical application may connect VBACKUP to a primary Li button cell, but any
battery that provides a voltage between 2.65 V and 6 V (i.e. a single Li-Ion cell or a single boosted NiMH battery)
is acceptable, to supply the VRTC output. In systems with no backup battery, the VBACKUP pin should be
connected to GND.
If the switches between VRTC and VSYSIN or VBACKUP are open, the dedicated 3-V/30-mA LDO, driven from
VCC, connects to VRTC. This LDO is disabled if the voltage at the VSYSIN input exceeds 2.65 V.
Inside TPS65023 there is a switch (Vmax switch) which selects the higher voltage between VCC and VBACKUP.
This is used as the supply voltage for some basic functions. The functions powered from the output of the Vmax
switch are:
INT output
RESPWRON output
HOT_RESET input
LOW_BAT output
PWRFAIL output
Enable pins for dc-dc converters, LDO1 and LDO2
Undervoltage lockout comparator (UVLO)
Reference system with low frequency timing oscillators
LOW_BAT and PWRFAIL comparators
The main 2.25-MHz oscillator, and the I2C interface are only powered from VCC.
Copyright 2009–2010, Texas Instruments Incorporated
21
Product Folder Link(s): TPS65023-Q1
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相关代理商/技术参数 |
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| TPS65023RSBG4 | 制造商:Texas Instruments 功能描述: |
| TPS65023RSBR | 功能描述:电池管理 6Ch Pwr Mgmt IC RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
| TPS65023RSBRG4 | 功能描述:电池管理 6Ch Pwr Mgmt IC RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
| TPS65023RSBT | 功能描述:电池管理 6-Channel Power Management IC RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
| TPS65023RSBT | 制造商:Texas Instruments 功能描述:Power Management IC |
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