參數(shù)資料
型號(hào)： TPS65270RGET
廠商： TEXAS INSTRUMENTS INC
元件分類(lèi)： 穩(wěn)壓器
英文描述： DUAL SWITCHING CONTROLLER, 1400 kHz SWITCHING FREQ-MAX, PQCC24
封裝： 4 X 4 MM, PLASTIC, VQFN-24
文件頁(yè)數(shù)： 3/20頁(yè)
文件大?。?/td> 1432K
代理商： TPS65270RGET
0
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0
0.5
1
1.5
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2.5
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f
- Switching Frequency - MHz
sw
Resistance
-
W
R
k
f
OSC
SW
(
) = 238
W
-1.05
SLVSAX7
– AUGUST 2011
OVERVIEW
TPS65270 is a power management IC with two step-down buck converters. Both high-side and low-side
MOSFETs are integrated to provide fully synchronous conversion with higher efficiency. TPS65270 can support
4.5-V to 16-V input supply, 2-A continuous current for Buck 1 and 3 A for Buck 2. The buck converters have an
automatic PSM mode, which can improve power dissipation during light loads. Alternatively, the device
implements a constant frequency mode by connecting the LOW_P pin to ground. The wide switching frequency
of 300 kHz to 1.4 MHz allows for efficiency and size optimization. The switching frequency is adjustable by
selecting a resistor to ground on the ROSC pin. Input ripple is reduced by 180
° out-of-phase operation between
Buck 1 and Buck 2.
Both buck converters have peak current mode control which simplifies the loop compensation. A traditional type
II compensation network can stabilize the system and achieve fast transient response. Moreover, an optional
capacitor in parallel with the upper resistor of the feedback divider provides one more zero and makes the
crossover frequency over 100 kHz. Each buck converter has an individual cycle-by-cycle current limit and low
side reverse current limit.
The device has a built-in LDO regulator. During a standby mode, the 6.5-V LDO can be used to drive MCU and
other active loads. with this LDO, system is able to turn off the two buck converters so as to reduce the power
consumption and improve the standby efficiency. Each converter has its own programmable soft start that can
reduce the input inrush current. The individual Enable pins for each independent control of each output voltage
and power sequence.
DETAILED DESCRIPTION
Adjustable Switching Frequency
To select the internal switching frequency connect a resistor from ROSC to ground. Figure 14 shows the required
resistance for a given switching frequency.
Figure 14. ROSC vs Switching Frequency
(1)
For operation at 800 kHz, a 300-k
resistor is required.
Out-of-Phase Operation
In order to reduce input ripple current, Buck 1 and Buck 2 operate 180
° out-of-phase. This enables the system
having less input ripple, then to lower component cost, save board space and reduce EMI.
Delayed Start-Up
If a delayed start-up is required on any of the buck converters fit a ceramic capacitor to the ENx pins. The delay
added is ~1.67 ms per nF connected to the pin. Note that the EN pins have a weak 1-M
pull-up to the 5-V rail.
Copyright
2011, Texas Instruments Incorporated
11
Product Folder Link(s): TPS65270
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