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參數(shù)資料
| 型號： | TPS65023QRHARQ1 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | POWER SUPPLY SUPPORT CKT, PQCC40 |
| 封裝： | 6 X 6 MM, GREEN, PLASTIC, MO-220VJJD-2, VQFN-40 |
| 文件頁數(shù)： | 17/54頁 |
| 文件大?。?/td> | 1546K |
| 代理商： | TPS65023QRHARQ1 |
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Vin
min +
Vout
min )
Ioutmax
r
DS(on)
max ) RL
SLVS927C – MARCH 2009 – REVISED MAY 2010
www.ti.com
a minimum, thus achieving the highest converter efficiency. Setting the comparator thresholds at the nominal
output voltage at light load current results in a low output voltage ripple. The ripple depends on the comparator
delay and the size of the output capacitor. Increasing capacitor values makes the output ripple tend to zero. The
PSM is disabled through the I2C interface to force the individual converters to stay in fixed frequency PWM
mode.
Low-Ripple Mode
Setting Bit 3 in register CON-CTRL to 1 enables the low ripple mode for all of the dc-dc converters if operated in
PFM mode. For an output current less than approximately 10 mA, the output voltage ripple in PFM mode is
reduced, depending on the actual load current. The lower the actual output current on the converter, the lower
the output ripple voltage. For an output current above 10 mA, there is only minor difference in output voltage
ripple between PFM mode and low ripple PFM mode. As this feature also increases switching frequency, it is
used to keep the switching frequency above the audible range in PFM mode down to a low output current.
Soft Start
Each of the three converters has an internal soft start circuit that limits the inrush current during start-up. The soft
start is realized by using a low current to initially charge the internal compensation capacitor. The soft start time
is typically 750 ms if the output voltage ramps from 5% to 95% of the final target value. If the output is already
precharged to some voltage when the converter is enabled, then this time is reduced proportionally. There is a
short delay of typically 170 ms between the converter being enabled and switching activity actually starting. This
allows the converter to bias itself properly, to recognize if the output is precharged, and if so to prevent
discharging of the output while the internal soft start ramp catches up with the output voltage.
100% Duty Cycle Low-Dropout Operation
The TPS65023 converters offer a low input to output voltage difference while still maintaining operation with the
use of the 100% duty cycle mode. In this mode the P-channel switch is constantly turned on. This is particularly
useful in battery-powered applications to achieve longest operation time by taking full advantage of the whole
battery voltage range. The minimum input voltage required to maintain dc regulation depends on the load current
and output voltage. It is calculated as:
(3)
with:
Ioutmax = maximum load current (Note: ripple current in the inductor is zero under these conditions)
rDS(on)max = maximum P-channel switch rDS(on)
RL = DC resistance of the inductor
Voutmin = nominal output voltage minus 2% tolerance limit
Active Discharge When Disabled
When the VDCDC1, VDCDC2, and VDCDC3 converters are disabled, due to an UVLO, DCDC_EN or
OVERTEMP condition, it is possible to actively pull down the outputs. This feature is disabled per default and is
individually enabled via the CON_CTRL2 register in the serial interface. When this feature is enabled, the
VDCDC1, VDCDC2, and VDCDC3 outputs are discharged by a 300
(typical) load which is active as long as
the converters are disabled.
Power Good Monitoring
All three step-down converters and both the LDO1 and LDO2 linear regulators have power good comparators.
Each comparator indicates when the relevant output voltage has dropped 10% below its target value with 5%
hysteresis. The outputs of these comparators are available in the PGOODZ register via the serial interface. An
interrupt is generated when any voltage rail drops below the 10% threshold. The comparators are disabled when
the converters are disabled and the relevant PGOODZ register bits indicate that power is good.
24
Copyright 2009–2010, Texas Instruments Incorporated
Product Folder Link(s): TPS65023-Q1
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| TPS65023QRSBRQ1 | 功能描述:電池管理 Auto Cat 6Ch Pwr Mgmt IC RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel |
| TPS65023RSBG4 | 制造商:Texas Instruments 功能描述: |
| TPS65023RSBR | 功能描述:電池管理 6Ch Pwr Mgmt IC RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel |
| TPS65023RSBRG4 | 功能描述:電池管理 6Ch Pwr Mgmt IC RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel |
| TPS65023RSBT | 功能描述:電池管理 6-Channel Power Management IC RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel |
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