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参数资料
| 型号： | TPS62082DSGR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 0.002 A SWITCHING REGULATOR, PDSO8 |
| 封装： | 2 X 2 MM, GREEN, PLASTIC, WSON-8 |
| 文件页数： | 5/26页 |
| 文件大小： | 872K |
| 代理商： | TPS62082DSGR |
IN,MIN
OUT
OUT,MAX
DS(on)
L
V
I
(R
+ R )
=
+
SLVSAE8
– SEPTEMBER 2011
DETAILED DESCRIPTION
DEVICE OPERATION
The TPS6208x synchronous switched mode converters are based on DCS
Control (Direct Control with
Seamless transition into Power Save Mode). This is an advanced regulation topology that combines the
advantages of hysteretic and voltage mode control.
The DCS
Control topology operates in PWM (Pulse Width Modulation) mode for medium to heavy load
conditions and in Power Save Mode at light load currents. In PWM the converter operates with its nominal
switching frequency of 2MHz having a controlled frequency variation over the input voltage range. As the load
current decreases the converter enters Power Save Mode, reducing the switching frequency and minimizing the
IC quiescent current to achieve high efficiency over the entire load current range. DCS
Control supports both
operation modes (PWM and PFM) using a single building block having a seamless transition from PWM to Power
Save Mode without effects on the output voltage. Fixed output voltage versions provide smallest solution size
combined with lowest quiescent current. The TPS6208x offers both excellent DC voltage and superior load
transient regulation, combined with very low output voltage ripple, minimizing interference with RF circuits.
The device is equipped with the Snooze Mode functionality, which is enabled with the Mode pin. The Snooze
Mode supports high efficiency conversion at lowest output currents below 2mA. If no load current is drawn, the
ultra low quiescent current of 6.5uA is sufficient to maintain the output voltage. This extends battery run time by
reducing the quiescent current during lowest or no load conditions in battery driven applications. For
mains-operated voltage supplies, the Snooze Mode reduces the system's stand-by energy consumption. During
shutdown (EN = LOW), the device reduces energy consumption to less than 1uA.
POWER SAVE MODE
As the load current decreases the TPS6208x will enter the Power Save Mode operation. During Power Save
Mode the converter operates with reduced switching frequency in PFM mode and with a minimum quiescent
current maintaining high efficiency. The power save mode occurs when the inductor current becomes
discontinuous. It is based on a fixed on time architecture. The typical on time is given by ton=210ns(VIN / VOUT).
SNOOZE MODE
The TPS6208x offers a Snooze Mode function. If the Snooze Mode is enabled by an external logic signal setting
the MODE pin to HIGH, the device's quiescent current consumption is reduced to typically 6.5
A. As a result, the
high efficiency range is extended towards the range of lowest output currents below 2mA, see the typical
characteristics efficiency figures.
If the device is operating in Snooze Mode, a dedicated, low power consuming block monitors the output voltage.
All other control blocks are snoozing during that time. If the output voltage falls below the programmed output
voltage by 3.5% (typ), the control blocks wake up, regulates the output voltage and allow themselves to snooze
again until the output voltage drops again. The Snooze Mode operation provides a clear efficiency improvement
at lowest output currents. If the load current increases, the advantage of efficiency in Snooze mode will be
deprived. Since the dynamic load regulation operates best if the Snooze Mode is disabled, it is recommended to
turn off the Snooze Mode by external logic signal if the load current exceeds 2mA, like a micro controller to
operate the MODE pin.
100% DUTY CYCLE LOW DROPOUT OPERATION
The device offers low input to output voltage difference by entering 100% duty cycle mode. In this mode the high
side MOSFET switch is constantly turned on and the low side MOSFET is switched off. 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 to maintain switching regulation, depending on the load current and
output voltage can be calculated as:
(1)
With:
VIN,MIN = Minimum input voltage
IOUT,MAX = Maximum output current
Copyright
2011, Texas Instruments Incorporated
13
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