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参数资料
| 型号： | TPS60211DGSRG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHED CAPACITOR REGULATOR, 400 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封装： | GREEN, PLASTIC, MSOP-10 |
| 文件页数： | 21/25页 |
| 文件大小： | 593K |
| 代理商： | TPS60211DGSRG4 |
TPS60210, TPS60211, TPS60212, TPS60213
REGULATED 3.3 V, LOW RIPPLE CHARGE PUMP
WITH ULTRALOW OPERATING CURRENT
SLVS296 JUNE 2000
5
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
detailed description (continued)
constant-frequency mode
When the output current is higher than the linskip current threshold, the charge pump runs continuously at the
switching frequency fOSC. The control circuit, fed from the error amplifier, controls the charge on C1 and C2 by
regulating the rDS(on) of the integrated MOSFET switches. When the output voltage decreases, the rDS(on)
decreases as well, resulting in a larger voltage across the flying capacitors C1 and C2. This regulation scheme
minimizes output ripple.
Since the device switches continuously, the output ripple contains well-defined frequency components, and the
circuit requires smaller external capacitors for a given output ripple. However, constant-frequency mode, due
to higher operating current, is less efficient at light loads. For this reason, the device switches seamlessly into
the pulse-skip mode when the output current drops below the linskip current threshold.
pulse-skip mode
The device enters the pulse-skip mode when the load current drops below the linskip current threshold of about
7 mA. In pulse-skip mode, the controller disables switching of the power stages when it detects an output voltage
higher than 3.3 V. It skips switching cycles until the output voltage drops below 3.3 V. Then the controller
reactivates the oscillator and switching of the power stages starts again. A 30-mV output voltage offset is
introduced in this mode.
The pulse-skip regulation mode minimizes operating current because it does not switch continuously and
deactivates all functions except the voltage reference and error amplifier when the output is higher than 3.3 V.
Even in pulse-skip mode the rDS(ON) of the MOSFETs is controlled. This way the energy per switching cycle that
is transferred by the charge pump from the input to the output is limited to the minimum that is necessary to
sustain a regulated output voltage, with the benefit that the output ripple is kept to a minimum. When switching
is disabled in pulse-skip mode, the load is isolated from the input.
start up, snooze mode, short circuit protection
During start-up (i.e., when voltage is applied to the supply pin IN) the input is connected to the output until the
output voltage reaches 0.8 x VI. When the start-up comparator detects this limit, the actual charge pump output
stages are activated to boost the voltage higher than the input voltage. This precharging of the output current
with a limited current ensures a short start-up time and avoids high inrush currents into an empty output
capacitor.
Driving SNOOZE low, programs the device into the snooze mode. In this mode, the converter will still maintain
the output voltage at 3.3 V
±6%. The operating current in snooze mode, is however, drastically reduced to a
typical value of 2
A, while the output current is limited to a maximum of 2 mA. If the load current increases above
2 mA, the controller recognizes a further drop of the output voltage and the device enters the start-up mode to
bring the voltage up to its nominal value again. However, it does not switch into the normal operating mode. The
device limits short circuit currents to typically 60 mA.
synchronization to an external clock signal
The operating frequency of the charge pump is limited to 400 kHz in order to avoid troublesome interference
problems in the sensitive 455-kHz IF band. The device can either run from the integrated oscillator, or an
external clock signal can be used to drive the charge pump. The maximum frequency of the external clock signal
is 800 kHz. The switching frequency used internally to drive the charge pump power stages is half of the external
clock frequency. The external clock signal is applied to the SNOOZE-pin. The device will switch into the snooze
mode if the signal on SNOOZE is held low for more than 10
s.
When the load current drops below the linskip current threshold, the device enters the pulse-skip mode but stays
synchronized to the external clock signal.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TPS60212 | 制造商:TI 制造商全称:Texas Instruments 功能描述:REGULATED 3.3V LOW RIPPLE CHARGE PUMP WITH ULTRA LOW OPERATING CURRENT |
| TPS60212DGS | 功能描述:电荷泵 Reg 3.3-V 50-mA Charge Pump RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 输出电压:- 1.5 V to - 5.5 V, 3 V to 11 V 输出电流:100 mA 电源电流:1 mA 最大工作温度:+ 70 C 封装 / 箱体:SOIC-8 Narrow 封装:Tube |
| TPS60212DGSG4 | 功能描述:电荷泵 Reg 3.3-V 50-mA Charge Pump RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 输出电压:- 1.5 V to - 5.5 V, 3 V to 11 V 输出电流:100 mA 电源电流:1 mA 最大工作温度:+ 70 C 封装 / 箱体:SOIC-8 Narrow 封装:Tube |
| TPS60212DGSR | 功能描述:电荷泵 Reg 3.3-V 50-mA Charge Pump RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 输出电压:- 1.5 V to - 5.5 V, 3 V to 11 V 输出电流:100 mA 电源电流:1 mA 最大工作温度:+ 70 C 封装 / 箱体:SOIC-8 Narrow 封装:Tube |
| TPS60212DGSRG4 | 功能描述:电荷泵 Reg 3.3-V 50-mA Charge Pump RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 输出电压:- 1.5 V to - 5.5 V, 3 V to 11 V 输出电流:100 mA 电源电流:1 mA 最大工作温度:+ 70 C 封装 / 箱体:SOIC-8 Narrow 封装:Tube |
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