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參數(shù)資料
| 型號： | MAX1636EAP |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Low-Voltage, Precision Step-Down Controller for Portable CPU Power |
| 中文描述： | 1 A SWITCHING CONTROLLER, 330 kHz SWITCHING FREQ-MAX, PDSO20 |
| 封裝： | 5.30 MM, MO-150, SSOP-20 |
| 文件頁數(shù)： | 17/24頁 |
| 文件大?。?/td> | 219K |
| 代理商： | MAX1636EAP |
Adjustable-Output Feedbac k
(Dual-Mode FB)
A fixed, preset output voltage of 2.5V and 3.3V is
selected when FB is connected to V
CC
or ground. In
this mode, internal resistors monitor the voltage on
CSL. For voltages other than the fixed-output options,
adjust the output voltage through a resistor divider con-
nected to FB (Figure 2). Calculate the output voltage
with the following formula:
V
OUT
= V
REF
(1 + R1 / R2)
where V
REF
= 1.1V nominal. Recommended normal val-
ues for R2 range from 5k
to 100k
. To achieve a 1.1V
nominal output, simply connect FB directly to CSL.
Remote output voltage sensing is not possible in fixed
output mode due to the combined nature of the volt-
age-sense and current-sense inputs (CSL). It is, howev-
er, easy to do in adjustable mode by using the top of
the external resistor divider as the remote sense point.
Low-Noise Operation (PWM Mode)
PWM mode (
SKIP
= high) minimizes RF and audio
interference in noise-sensitive applications such as hi-fi
multimedia-equipped systems, cellular phones, RF
communicating computers, and electromagnetic pen-
entry systems. See the summary of operating modes in
Table 5.
SKIP
can be driven from an external logic signal.
PWM mode forces a constant switching frequency,
reducing interference due to switching noise by con-
centrating the emissions at a known frequency outside
the system audio or IF bands. Choose an oscillator fre-
quency for which switching frequency harmonics do
not overlap a sensitive frequency band. If necessary,
synchronize the oscillator to a tight-tolerance external
clock generator. To extend the output voltage-regula-
tion range, constant operating frequency is not main-
tained under overload or dropout conditions (see the
Overload and Dropout Operationsection).
PWM mode (
SKIP
= high) forces two changes on the
PWM controller. First, it disables the minimum-current
comparator, ensuring fixed-frequency operation.
Second, it changes the detection threshold for reverse-
current limit from 0mV to -100mV, allowing the inductor
current to reverse at light loads. This results in fixed-fre-
quency operation and continuous inductor-current flow.
PWM mode eliminates discontinuous-mode inductor
ringing and improves cross-regulation of transformer-
coupled, multiple-output supplies.
In most applications, tie
SKIP
to GND to minimize qui-
escent supply current. VL supply current with
SKIP
high
is typically 20mA, depending on external MOSFET gate
capacitance and switching losses.
M
Controller for Portable CPU Power
______________________________________________________________________________________
17
0
2
4
-50
50
I
OUT
(A)
V
OUT
(mV)
(100
μ
s/div)
CC = REF
V
OUT
= 3.3V
INTEGRATOR
DEFEATED
0
2
4
-50
50
I
OUT
(A)
V
OUT
(mV)
(100
μ
s/div)
CC = 470pF
V
OUT
= 3.3V
INTEGRATOR
ACTIVE
Figure 5a. Load-Transient Response with Integrator Active
Figure 5b. Load-Transient Response with Integrator Defeated
Low-Voltage, Prec ision S tep-Down
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1636EAP+ | 功能描述:DC/DC 開關(guān)控制器 Precision Step-Down for Portable CPU Pwr RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| MAX1636EAP+T | 功能描述:DC/DC 開關(guān)控制器 Precision Step-Down for Portable CPU Pwr RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| MAX1636EAP-T | 功能描述:DC/DC 開關(guān)控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| MAX1637EEE | 功能描述:DC/DC 開關(guān)控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| MAX1637EEE+ | 功能描述:DC/DC 開關(guān)控制器 Mini Precision Step Down RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
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