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參數(shù)資料
| 型號： | TPS60141PWPR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 0.1 A SWITCHED CAPACITOR REGULATOR, 450 kHz SWITCHING FREQ-MAX, PDSO20 |
| 封裝： | GREEN, PLASTIC, HTSSOP-20 |
| 文件頁數(shù)： | 19/23頁 |
| 文件大?。?/td> | 862K |
| 代理商： | TPS60141PWPR |
TPS60140, TPS60141
LOW POWER DCDC CONVERTER
REGULATED 5 V, 100mA CHARGE PUMP VOLTAGE TRIPLER
SLVS273 FEBRUARY 2000
5
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
detailed description (continued)
start-up procedure and shutdown
During start-up, i.e., when ENABLE is set from logic low to logic high, the output capacitor is charged up with
a limited current until the output voltage(VO) reaches 0.8 x VI. When the start-up comparator detects this voltage
limit, the IC begins switching. This pre-charging of the output capacitor ensures a short start-up time. In addition,
the inrush current into an empty output capacitor is limited because the current through the switches is limited
before the charge pump starts switching.
Driving ENABLE low places the device in shutdown mode. This disables all switches, the oscillator, and control
logic. The device typically draws 0.05
A of supply current in this mode. Leakage current drawn from the output
is as low as 1
A max. The device exits shutdown once ENABLE is set to a high level. When the device is in
shutdown, the load is isolated from the input.
undervoltage lockout and short-circuit protection
The TPS6014x devices have an undervoltage lockout feature that deactivates the device and places it in
shutdown mode when the input voltage falls below 1.6 V. The devices are also short-circuit protected. The output
current is limited to typically 100 mA during a hard short circuit condition at the output, i.e., when VO is GND.
In this case the condition to enter the start-up mode is met, the device stops switching and controls the
on-resistance of the appropriate MOSFET switches to limit the current.
low-battery detector (TPS60140 only)
The internal low-battery comparator trips at 1.21 V
± 5% when the voltage on pin LBI ramps down. The voltage
V(TRIP) at which the low battery warning is issued can be adjusted with a resistive divider as shown in Figure 1.
The sum of resistors R1 and R2 is recommended to be in the 100 k
to 1 M range. When choosing R1 and
R2, be aware of the input leakage current into the LBI terminal.
LBO is an open drain output. An external pullup resistor to OUT, in the 100 k
to 1 M range, is recommended.
During start-up, the LBO output signal is invalid for the first 500
s. LBO is high impedance when the device
is disabled. If the low-battery comparator function is not used, connect LBI to ground and leave LBO
unconnected.
V
(TRIP)
+ 1.21 V
1
)
R1
R2
VO
_
+
VREF
VBAT
R2
R1
LBI
IN
LBO
R3
Figure 1. Programming of the Low-Battery Comparator Trip Voltage
A 100 nF ceramic capacitor should be connected in parallel to R2 if large line transients are expected. These
voltage drops can inadvertently trigger the low-battery comparator and produce a wrong low-battery warning
signal at the LBO pin.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TPS60141PWPRG4 | 功能描述:電荷泵 Reg 5-V Charge Pump RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 輸出電壓:- 1.5 V to - 5.5 V, 3 V to 11 V 輸出電流:100 mA 電源電流:1 mA 最大工作溫度:+ 70 C 封裝 / 箱體:SOIC-8 Narrow 封裝:Tube |
| TPS60150 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:TPS60150 5V/140mA Charge Pump Device |
| TPS60150_09 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:TPS60150 5V/140mA Charge Pump Device |
| TPS60150DRV | 制造商:TI 制造商全稱:Texas Instruments 功能描述:TPS60150 5V/140mA Charge Pump Device |
| TPS60150DRVR | 功能描述:電荷泵 150mA,5V Charge Pump RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 輸出電壓:- 1.5 V to - 5.5 V, 3 V to 11 V 輸出電流:100 mA 電源電流:1 mA 最大工作溫度:+ 70 C 封裝 / 箱體:SOIC-8 Narrow 封裝:Tube |
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