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參數(shù)資料
| 型號： | MAX1637 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Miniature, Low-Voltage, Precision Step-Down Controller |
| 中文描述： | 微型、低電壓、高精度降壓型控制器 |
| 文件頁數(shù)： | 7/20頁 |
| 文件大?。?/td> | 211K |
| 代理商： | MAX1637 |
M
Miniature, Low-Voltage,
Prec ision S tep-Down Controller
_______________________________________________________________________________________
7
MAX1637
0.1
μ
F
V
BIAS
+5V
NOMINAL
0.1
μ
F
1
μ
F
470pF
C1
Q1
CMPSH-3
Q2
C2
L1
*
R1
R2
R3
OUTPUT
4.7
μ
F
*SEE RECTIFIER CLAMP DIODE SECTION
**OPTIONAL RC NETWORK FOR POWER-ON-RESET
DL
PGND
LX
DH
BST
V
GG
V
CC
V
BATT
CSH
CSL
FB
1M
**
ON/OFF
CC
GND
SHDN
REF
SYNC
20
SKIP
0.01
μ
F
**
Figure 1. Standard Application Circuit
______S tandard Applic ation Circ uit
The basic MAX1637 buck converter (Figure 1) is easily
adapted to meet a wide range of applications where a
5V or lower supply is available. The components listed
in Table 1 represent a good set of trade-offs among
cost, size, and efficiency, while staying within the worst-
case specification limits for stress-related parameters
such as capacitor ripple current. Do not change the cir-
cuit’s switching frequency without first recalculating
component values (particularly inductance value at
maximum battery voltage).
The power Schottky diode across the synchronous rec-
tifier is optional because the MOSFETs chosen incorpo-
rate a high-speed silicon diode. However, installing the
Schottky will generally improve efficiency by about 1%.
If used, the Schottky diode DC current must be rated to
at least one-third of the maximum load current.
_______________Detailed Desc ription
The MAX1637 is a BiCMOS, switch-mode power-supply
(SMPS) controller designed primarily for buck-topology
regulators in battery-powered applications where high
efficiency and low quiescent supply current are critical.
Light-load efficiency is enhanced by automatic idle-
mode operation—a variable-frequency, pulse-skipping
mode that reduces transition and gate-charge losses.
The step-down, power-switching circuit consists of two
N-channel MOSFETs, a rectifier, and an LC output filter.
Output voltage for this device is the average AC volt-
age at the switching node, which is regulated by
changing the duty cycle of the MOSFET switches. The
gate-drive signal to the high-side N-channel MOSFET,
which must exceed the battery voltage, is provided by
a flying-capacitor boost circuit that uses a 100nF
capacitor between BST and LX. Figure 2 shows the
major circuit blocks.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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 |
| MAX1637EEE+T | 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 |
| MAX1637EEE-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 |
| MAX1637EVKIT | 制造商:Maxim Integrated Products 功能描述:MINIATURE, LOW-VOLTAGE, PRECISION STEP-DOWN C - Bulk |
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