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參數(shù)資料
| 型號： | MAX797 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Step-Down Controllers with Synchronous Rectifier for CPU Power(3.3V/5V/可調(diào),帶有同步整流器的PWM步降控制器，用于筆記本電腦) |
| 中文描述： | 同步整流降壓型控制器，用于CPU電源 |
| 文件頁數(shù)： | 10/32頁 |
| 文件大?。?/td> | 395K |
| 代理商： | MAX797 |
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M
S tep-Down Controllers with
S ync hronous Rec tifier for CPU Power
10
______________________________________________________________________________________
______S tandard Applic ation Circ uit
It is easy to adapt the basic MAX797 single-output 3.3V
buck converter (Figure 1) to meet a wide range of
applications with inputs up to 28V (limited by choice of
external MOSFET). Simply substitute the appropriate
components from Table 1. These circuits represent a
good set of tradeoffs between cost, size, and efficiency
while staying within the worst-case specification limits
for stress-related parameters such as capacitor ripple
current. Each of these circuits is rated for a continuous
load current at T
A
= +85°C, as shown. The 1A, 2A and
10A applications can withstand a continuous output
short-circuit to ground. The 3A and 5A applications can
withstand a short circuit of many seconds duration, but
the synchronous-rectifier MOSFET overheats, exceed-
ing the manufacturer’s ratings for junction temperature
by 50°C or more.
If the 3A or 5A circuit must be guaranteed to withstand
a continuous output short circuit indefinitely, see the
section MOSFET Switches under Selecting Other
Components. Don’t change the frequency of these cir-
cuits without first recalculating component values (par-
ticularly inductance value at maximum battery voltage).
MAX797
CSL
CSH
VL
SYNC
5
FB
7
V+
10
11
14
Q1
Q2
16
15
13
D2
CMPSH-3
J1
150kHz/300kHz
JUMPER
NOTE:
KEEP CURRENT-SENSE
LINES SHORT AND CLOSE
TOGETHER. SEE FIG. 10
D1
12
8
9
REF
3
GND
4
+5V AT
5mA
+3.3V
OUTPUT
GND
OUT
BST
DH
LX
DL
2
1
LOW-NOISE
CONTROL
PGND
SKIP
SS
6
ON/OFF
CONTROL
SHDN
INPUT
REF OUTPUT
+2.505V AT 100
μ
A
C5
0.33
μ
F
C4
4.7
μ
F
C7
0.1
μ
F
C6
0.01
μ
F
(OPTIONAL)
C1
C2
C3
0.1
μ
F
R1
L1
Figure 1. Standard 3.3V Application Circuit
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX797C/D | 功能描述:DC/DC 開關(guān)控制器 Step down controller 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 安裝風格: 封裝 / 箱體:CPAK |
| MAX797C/D DIE | 制造商:Maxim Integrated Products 功能描述: |
| MAX797CPE | 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 安裝風格: 封裝 / 箱體:CPAK |
| MAX797CSE | 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 安裝風格: 封裝 / 箱體:CPAK |
| MAX797CSE+ | 功能描述:DC/DC 開關(guān)控制器 Step-Down Controller for CPU Power 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 安裝風格: 封裝 / 箱體:CPAK |
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