參數(shù)資料
型號： MAX1717EEG
廠商： MAXIM INTEGRATED PRODUCTS INC
元件分類： 穩(wěn)壓器
英文描述： Replaced by TMS320VC5506 : Digital Signal Processors 100-LQFP
中文描述： SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO24
封裝： 0.150 INCH, 0.025 INCH PITCH, MO-137AC, QSOP-24
文件頁數(shù)： 17/32頁
文件大?。?/td> 501K
代理商： MAX1717EEG
M
Dynamically Adjustable, Synchronous
Step-Down Controller for Notebook CPUs
______________________________________________________________________________________
17
where K is the on-time scale factor (Table 3). The load-
current level at which PFM/PWM crossover occurs,
I
LOAD(SKIP)
, is equal to 1/2 the peak-to-peak ripple cur-
rent, which is a function of the inductor value (Figure 4).
For example, in the standard application circuit this
becomes:
The crossover point occurs at an even lower value if a
swinging (soft-saturation) inductor is used.
The switching waveforms may appear noisy and asyn-
chronous when light loading causes pulse-skipping
operation, but this is a normal operating condition that
results in high light-load efficiency. Trade-offs in PFM
noise vs. light-load efficiency are made by varying the
inductor value. Generally, low inductor values produce
a broader efficiency vs. load curve, while higher values
result in higher full-load efficiency (assuming that the
coil resistance remains fixed) and less output voltage
ripple. Penalties for using higher inductor values
include larger physical size and degraded load-tran-
sient response (especially at low input voltage levels).
3 3
.
μ
H
2 1
12
V
12
1 6
1 6
2 3
μ
s
V
V
V
A
I
K
V
L
V
V
V
LOAD SKIP
OUT
BATT
OUT
BATT
(
)
2
≈
V
CC
V
BATT
+5V
BIAS SUPPLY
C2
POWER-GOOD
INDICATOR
L1
1
μ
H
R6
0.005
SKP/SDN
V+
22
1
2
3
21
20
19
18
24
23
14
13
4
5
11
12
7
15
D2
CMPSH-3
C6
1
μ
F
C7
0.1
μ
F
C4
1
μ
F
C3
470pF
TO V
CC
Q1
D1
R2
100k
Q2
C5
1
μ
F
R1
20
C1
D0
TIME
D1
D2
ON/OFF
CONTROL
DL
LX
BST
DH
GND
FB
FBS
GNDS
D1 = INTL RECT 10MQ040N.
FOR OTHER COMPONENTS,
SEE TABLE 1 VALUES.
VGATE
V
DD
MAX1717
8
9
6
10
+5V
16
D3
17
D4
TON
REF
CC
A/B
ILIM
R7
120k
100k
TO V
CC
HIGH/LOW
R4
2k
R5
150k
TO V
REF
A/B = LOW = 1.60V
A/B = HIGH = 1.35V
V
OUT
Figure 3. Voltage-Positioned Circuit
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX1717EEG+ 功能描述:DC/DC 開關(guān)控制器 Adj Synchronous 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
MAX1717EEG+C71058 功能描述:DC/DC 開關(guān)控制器 Step-Down Controller for Notebook CPU 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
MAX1717EEG+T 功能描述:DC/DC 開關(guān)控制器 Adj Synchronous 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
MAX1717EEG-C71058 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述:
MAX1717EEG-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
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