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参数资料
| 型号： | TPS60121PWPRG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 0.2 A SWITCHED CAPACITOR REGULATOR, 450 kHz SWITCHING FREQ-MAX, PDSO20 |
| 封装： | GREEN, PLASTIC, HTSSOP-20 |
| 文件页数： | 26/30页 |
| 文件大小： | 878K |
| 代理商： | TPS60121PWPRG4 |
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TPS60120, TPS60121, TPS60122, TPS60123, TPS60124, TPS60125
REGULATED 200-mA HIGH EFFICIENCY CHARGE PUMP
DC/DC CONVERTERS
SLVS257B – NOVEMBER 1999 – REVISED AUGUST 2000
5
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
adaptive mode switching (continued)
The voltage on the flying capacitors is measured and compared with the supply voltage (VI). If the voltage across
the flying capacitors is smaller than half of the supply voltage, then the charge pump switches into the 1.5x
conversion-mode. The charge pump switches back from a 1.5x conversion-mode to a voltage doubler mode
if the load current in 1.5x conversion-mode can no longer be delivered.
With this control mode the device runs in doubler-mode at low VI and in 1.5x conversion-mode at high VI to
optimize the efficiency. The most desirable doubler mode is automatically selected depending on both VI and
IL. This means that at light loads the device selects the 1.5x conversion-mode already at smaller supply voltages
than at heavy loads.
The TPS6012x output voltage is regulated using the
ACTIVE-CYCLE regulation. An active cycle controlled
charge pump utilizes two methods to control the output voltage. At high load currents it varies the on resistances
of the internal switches and keeps the ratio ON/OFF time (=frequency) constant. That means the charge pump
runs at a fixed frequency. It also keeps the output voltage ripple as low as in linear-mode. At light loads the
internal resistance and also the amount of energy transferred per pulse is fixed and the charge pump regulates
the voltage by means of a variable ratio of ON-to-OFF time. In this operating point, it runs like a skip mode
controlled charge pump with a very high internal resistance, which also enables a low ripple in this operation
mode. Since the charge pump does effectively switch at lower frequencies at light loads, it achieves a low
quiescent current.
pulse-skip mode
In pulse-skip mode the error amplifier disables switching of the power stages when it detects an output higher
than the nominal output voltage. The oscillator halts and the IC then skips switching cycles until the output
voltage drops below the nominal output voltage. Then the error amplifier reactivates the oscillator and starts
switching the power stages again. The pulse-skip regulation mode minimizes operating current because it does
not switch continuously and deactivates all functions except bandgap reference, error amplifier, and
low-battery/power-good comparator when the output is higher than the nominal output voltage. When switching
is disabled from the error amplifier, the load is also isolated from the input. In pulse-skip mode, a special current
control circuitry limits the peak current. This assures moderate output voltage ripple and also prevents the
device from drawing excessive current spikes out of the battery.
start-up procedure
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 × VI. When the start-up comparator detects this voltage
limit, the IC begins switching. This start-up charging of the output capacitor ensures a short start-up time and
eliminates the need of a Schottky diode between IN and OUT. The IC starts into a maximum load resistance
of VO(nom)/IO(max).
shutdown
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 (1 A max) 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. The typical
no-load shutdown exit time is 10
s. When the device is in shutdown, the load is isolated from the input.
undervoltage lockout and short-circuit current limit
The TPS6012x devices have an undervoltage lockout feature that deactivates the device and places it in
shutdown mode when the input voltage falls below the typical threshold voltage of 1.6 V. During a short-circuit
condition at the output, the current is limited to 115 mA.
相关PDF资料 |
PDF描述 |
|---|---|
| TPS60122PWPR | 0.2 A SWITCHED CAPACITOR REGULATOR, 450 kHz SWITCHING FREQ-MAX, PDSO20 |
| TPS60124PWP | 0.2 A SWITCHED CAPACITOR REGULATOR, 450 kHz SWITCHING FREQ-MAX, PDSO20 |
| TPS60121PWPR | 0.2 A SWITCHED CAPACITOR REGULATOR, 450 kHz SWITCHING FREQ-MAX, PDSO20 |
| TPS60122PWP | 0.2 A SWITCHED CAPACITOR REGULATOR, 450 kHz SWITCHING FREQ-MAX, PDSO20 |
| TPS60123PWPG4 | 0.2 A SWITCHED CAPACITOR REGULATOR, 450 kHz SWITCHING FREQ-MAX, PDSO20 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| TPS60122 | 制造商:TI 制造商全称:Texas Instruments 功能描述:REGULATED 3.3 V, 200-mA HIGH EFFICIENCY CHARGE PUMP DC/DC CONVERTERS |
| TPS60122PWP | 功能描述:电荷泵 Reg 3.3V Hi-Eff Chrg Pump DC/DC Converter 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 |
| TPS60122PWPG4 | 功能描述:电荷泵 Reg 3.3V Hi-Eff Chrg Pump DC/DC Converter 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 |
| TPS60122PWPR | 功能描述:电荷泵 Reg 3.3V Hi-Eff Chrg Pump DC/DC Converter 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 |
| TPS60122PWPRG4 | 功能描述:电荷泵 Reg 3.3V Hi-Eff Chrg Pump DC/DC Converter 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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