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| 型號： | V62/07622-03XE |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 2.4 A SWITCHING REGULATOR, 1100 kHz SWITCHING FREQ-MAX, PQCC16 |
| 封裝： | GREEN, PLASTIC, QFN-16 |
| 文件頁數(shù)： | 6/25頁 |
| 文件大?。?/td> | 630K |
| 代理商： | V62/07622-03XE |
V (nominal)
O
0.8%
1.6%
-1.6%
t
W
2 5
I
V
S K I P
I
(1)
SOFT START
100% DUTY CYCLE LOW DROPOUT OPERATION
(
)
(
max
)
(
max
min
L
R
on
DS
r
O
I
O
V
I
V
+
×
+
=
(2)
SLVS630C – APRIL 2007 – REVISED MAY 2008 .............................................................................................................................................................. www.ti.com
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
14
Copyright 2007–2008, Texas Instruments Incorporated
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