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參數(shù)資料
| 型號(hào)： | MAX1638EEG |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 中文描述： | SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO24 |
| 封裝： | 0.150 INCH, 0.025 INCH PITCH, QSOP-24 |
| 文件頁數(shù)： | 16/16頁 |
| 文件大小： | 149K |
| 代理商： | MAX1638EEG |
__________Applic ations Information
Effic ienc y Considerations
Refer to the MAX796–MAX799 data sheet for informa-
tion on calculating losses and improving efficiency.
PC Board Layout Considerations
Good PC board layout and routing are required in high-
current, high-frequency switching power supplies to
achieve good regulation, high efficiency, and stability.
The PC board layout artist must be provided with
explicit instructions concerning the placement of
power-switching components and high-current routing.
It is strongly recommended that the evaluation kit PC
board layouts be followed as closely as possible.
Contact Maxim’s Applications Department concerning
the availability of PC board examples for higher-current
circuits.
In most applications, the circuit is on a multilayer
board, and full use of the four or more copper layers is
recommended. Use the top layer for high-current
power and ground connections. Leave the extra cop-
per on the board as a pseudo-ground plane. Use the
bottom layer for quiet connections (REF, FB, AGND),
and the inner layers for an uninterrupted ground plane.
A ground plane and pseudo-ground plane are essential
for reducing ground bounce and switching noise.
Place the high-power components (C1, R1, N1, D1, N2,
L1, and C2 in Figure 1) as close together as possible.
Minimize ground-trace lengths in high-current paths.
The surface-mount power components should be
butted up to one another with their ground terminals
almost touching. Connect their ground terminals using
a wide, filled zone of top-layer copper (the pseudo-
ground plane), rather than through the internal ground
plane. At the output terminal, use vias to connect the
top-layer pseudo-ground plane to the normal inner-
layer ground plane at the output filter capacitor ground
terminals. This minimizes interference from IR drops
and ground noise, and ensures that the IC’s AGND is
sensing at the supply’s output terminals.
Minimize high-current path trace lengths. Use very
short and wide traces. From C1 to N1: 0.4 in. (10mm)
max length; D1 anode to N2: 0.2 in. (5mm) max length;
LX node (N1 source, N2 drain, D1 cathode, inductor
L1): 0.6 in. (15mm) max length.
__________________Pin Configuration
___________________Chip Information
24
23
22
21
20
19
18
17
1
2
3
4
5
6
7
8
DH
LX
PGND
DL
CSH
CSL
PWROK
BST
TOP VIEW
V
DD
PDRV
NDRV
D3
LG
D0
D1
D2
16
15
14
13
9
10
11
12
D4
FREQ
CC2
CC1
FB
AGND
REF
V
CC
SSOP/QSOP*
MAX1638
TRANSISTOR COUNT: 3135
SUBSTRATE CONNECTED TO AGND
M
High-S peed S tep-Down Controller with
S ync hronous Rec tific ation for CPU Power
16
______________________________________________________________________________________
R2
(OPTIONAL)
(OPTIONAL)
(OPTIONAL)
INPUT 5V
C2
C8
OUTPUT
1.3V TO3.5V
N3
NDRV
PDRV
LOAD
MAX1638
P1
Figure 6. GlitchCatcher Circuit
*Future package
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| MAX1638VRMEVKIT | 功能描述:DC/DC 開關(guān)控制器 High-Speed Step-Down Controller with Synchronous Rectification 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(fēng)格: 封裝 / 箱體:CPAK |
| MAX1639ESE | 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 |
| MAX1639ESE+ | 功能描述:DC/DC 開關(guān)控制器 High Speed 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 |
| MAX1639ESE+T | 功能描述:DC/DC 開關(guān)控制器 High Speed 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 |
| MAX1639ESE-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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