參數(shù)資料
型號(hào)： MAX1714BEEE
廠商： MAXIM INTEGRATED PRODUCTS INC
元件分類(lèi)： 穩(wěn)壓器
英文描述： High-Speed Step-Down Controller for Notebook Computers
中文描述： SWITCHING CONTROLLER, 600 kHz SWITCHING FREQ-MAX, PDSO16
封裝： 0.150 INCH, 0.025 INCH PITCH, MO-137AA, QSOP-16
文件頁(yè)數(shù)： 20/24頁(yè)
文件大小： 443K
代理商： MAX1714BEEE
M
High-Speed Step-Down Controller
for Notebook Computers
20
______________________________________________________________________________________
capacitors close to the CPU. Resistance values higher
than 5m
just improve the stability (which can be
observed by examining the load-transient response
characteristic as shown in the
Typical Operating
Characteristics
). Avoid adding excess PC board trace
resistance, as there’s an efficiency penalty; 5m
is suffi-
cient for a 7A circuit.
V
SOAR
determines the minimum output capacitance
requirement. In this example, the switching frequency
has been increased to 600kHz and the inductor value
has been reduced to 0.5μH (compared to 300kHz and
1.5μH for the standard 8A circuit) in order to minimize the
energy transferred from inductor to capacitor during
load-step recovery. The overshoot must be calculated to
avoid tripping the OVP latch. The efficiency penalty for
operating at 600kHz is about 2% to 3%, depending on
the input voltage.
An optional 1k
resistor is placed in series with OUT.
This resistor attenuates high-frequency noise in some
boards, which can cause double pulsing.
Fixed Output Voltages
The MAX1714’s Dual Mode operation allows the selec-
tion of common voltages without requiring external com-
ponents (Figure 8). Connect FB to AGND for a fixed
+2.5V output or to V
CC
for a +3.3V output, or connect FB
directly to OUT for a fixed +1.0V output.
Setting V
OUT
with a Resistor-Divider
The output voltage can be adjusted with a resistor-
divider if desired (Figure 9). The equation for adjusting
the output voltage is:
where V
FB
is 1.0V.
2-Stage (5V Powered) Notebook CPU
Buck Regulator
The most efficient and overall cost-effective solution for
stepping down a high-voltage battery to a very low out-
put voltage is to use a single-stage buck regulator that’s
powered directly from the battery. However, there may
be situations where the battery bus can’t be routed near
the CPU, or where space constraints dictate the smallest
possible local DC-DC converter. In such cases, the 5V
powered circuit of Figure 10 may be appropriate. The
reduced input voltage allows a higher switching frequen-
cy and a much smaller inductor value.
PC Board Layout Guidelines
Careful PC board layout is critical to achieving low
switching losses and clean, stable operation. The switch-
ing power stage requires particular attention (Figure 11).
If possible, mount all of the power components on the
top side of the board with their ground terminals flush
against one another. Follow these guidelines for good PC
board layout:
Keep the high-current paths short, especially at the
ground terminals. This practice is essential for stable,
jitter-free operation.
Connect AGND and PGND together close to the IC.
For the MAX1714B, these grounds are connected
internally to the GND pin. Carefully follow the ground-
ing instructions under step 4 of the
Layout Procedure
.
Keep the power traces and load connections short.
This practice is essential for high efficiency. Using
thick copper PC boards (2 oz vs. 1 oz) can enhance
full-load efficiency by 1% or more. Correctly routing
PC board traces is a difficult task that must be
approached in terms of fractions of centimeters,
V
V
1 R1
R2
OUT
FB
=
2V
0.2V
OUT
FB
FIXED
2.5V
TO ERROR AMP
FIXED
3.3V
MAX1714
Figure 8. Feedback Mux
Dual Mode is a trademark of Maxim Integrated Products.
R
1
2FC
ESR
OUT
≥
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參數(shù)描述
MAX1714BEEE+ 功能描述:電流型 PWM 控制器 Step-Down Controller for Notebook RoHS:否 制造商:Texas Instruments 開(kāi)關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14
MAX1714BEEE+T 功能描述:電流型 PWM 控制器 Step-Down Controller for Notebook RoHS:否 制造商:Texas Instruments 開(kāi)關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14
MAX1714BEEE-T 功能描述:電流型 PWM 控制器 RoHS:否 制造商:Texas Instruments 開(kāi)關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14
MAX1714BEEE-TG074 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述:
MAX1714BEVKIT 功能描述:電流型 PWM 控制器 Evaluation Kit for the MAX1714B RoHS:否 制造商:Texas Instruments 開(kāi)關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14
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