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| 型号： | TPS62111RSATG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 2.4 A SWITCHING REGULATOR, 1100 kHz SWITCHING FREQ-MAX, PQCC16 |
| 封装： | GREEN, PLASTIC, QFN-16 |
| 文件页数： | 5/28页 |
| 文件大小： | 842K |
| 代理商： | TPS62111RSATG4 |
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V (nominal)
O
0.8%
1.6%
–1.6%
t
I
SKIP
V
I
25
W
(1)
SOFT START
100% DUTY-CYCLE, LOW-DROPOUT OPERATION
I
O
DS(on)
(L)
V min
V max I max (r
max R
)
=
+
g
(2)
www.ti.com .................................................................................................................................................... SLVS585A – JULY 2005 – REVISED FEBRUARY 2009
DETAILED DESCRIPTION (continued)
Figure 18. Power-Save Mode Output-Voltage Thresholds
The typical PFM (SKIP) current threshold for the TPS6211x is given by:
Equation 1 is valid for input voltages up to 7 V. For higher voltages, the skip current threshold is not increased
further. The converter enters the fixed-frequency PWM mode as soon as the output voltage falls below VO –
1.6% (nominal).
The TPS6211x has an internal soft-start circuit that limits the inrush current during start-up. This prevents
possible voltage drops of the input voltage when a battery or a high-impedance power source is connected to the
input of the TPS6211x.
The soft start is implemented as a digital circuit increasing the switch current in steps of 300 mA, 600 mA, 1200
mA. The typical switch current limit is 2.4 A. Therefore, the start-up time depends on the output capacitor and
load current. Typical start-up time with a 22-F output capacitor and 800-mA load current is 1 ms.
The TPS6211x offers the lowest possible input-to-output voltage difference while still maintaining operation with
the use of the 100% duty-cycle mode. In this mode, the P-channel switch is constantly turned on. This is
particularly useful in battery-powered applications to achieve the longest operation time, 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 is calculated as:
with:
IOmax = maximum output current plus inductor ripple current
rDS(on)max = maximum P-channel switch rDS(on)
R(L) = dc resistance of the inductor
VOmax = nominal output voltage plus maximum output-voltage tolerance
Copyright 2005–2009, Texas Instruments Incorporated
13
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