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參數資料
| 型號： | TPS62691YFFT |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩壓器 |
| 英文描述： | 0.6 A SWITCHING REGULATOR, 4400 kHz SWITCHING FREQ-MAX, BGA6 |
| 封裝： | DSBGA-6 |
| 文件頁數： | 9/27頁 |
| 文件大小： | 870K |
| 代理商： | TPS62691YFFT |
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PFMModeatLightLoad
PFMRipple
PWMModeatHeavyLoad
NominalDCOutputVoltage
(
)
IN
OUT
DS(on)
L
V min = V
max + I
max
R
max + R
SLVS965
– MARCH 2011
Figure 35. Operation in PFM Mode and Transfer to PWM Mode
MODE SELECTION
The MODE pin allows to select the operating mode of the device. Connecting this pin to GND enables the
automatic PWM and power-save mode operation. The converter operates in regulated frequency PWM mode at
moderate to heavy loads and in the PFM mode during light loads, which maintains high efficiency over a wide
load current range.
Pulling the MODE pin high forces the converter to operate in the PWM mode even at light load currents. The
advantage is that the converter modulates its switching frequency according to a spread spectrum PWM
modulation technique allowing simple filtering of the switching harmonics in noise-sensitive applications. In this
mode, the efficiency is lower compared to the power-save mode during light loads.
For additional flexibility, it is possible to switch from power-save mode to PWM mode during operation. This
allows efficient power management by adjusting the operation of the converter to the specific system
requirements.
LOW DROPOUT, 100% DUTY CYCLE OPERATION
The device starts to enter 100% duty cycle mode once input and output voltage come close together. In order to
maintain the output voltage, the P-channel MOSFET is turned on 100% for one or more cycles.
With further decreasing VIN the high-side switch is constantly turned on, thereby providing a low input-to-output
voltage difference. 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 regulation depends on the load current and output voltage, and can be
calculated as:
(1)
With:
IOUTmax = Maximum output current, plus inductor ripple current.
RDS(on)max = Maximum P-channel MOSFET RDS(on).
RL = Inductor DC resistance.
VOUTmax = Nominal output voltage, plus maximum output voltage tolerance.
2011, Texas Instruments Incorporated
17
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