- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄383481 > MAX668-MAX669 (Maxim Integrated Products, Inc.) 1.8V to 28V Input, PWM Step-Up Controllers in レMAX PDF資料下載
參數(shù)資料
| 型號： | MAX668-MAX669 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | 1.8V to 28V Input, PWM Step-Up Controllers in レMAX |
| 中文描述： | 1.8V至28V輸入，PWM升壓控制器在レ最大 |
| 文件頁數(shù)： | 10/18頁 |
| 文件大?。?/td> | 326K |
| 代理商： | MAX668-MAX669 |
M
1.8V to 28V Input, PWM Step-Up
Controllers in μMAX
10
______________________________________________________________________________________
MAX669
LDO
CS+
REF
FREQ
V
CC
SYNC/
SHDN
PGND
FB
GND
N1
EXT
V
IN
= 1.8V to 12V
C3
0.22
μ
F
C2
0.1
μ
F
C4
1
μ
F
R4
100k
1%
R1
0.02
R2
218k
1%
R3
24.9k
1%
C7
220pF
D1
MBRS340T3
IRF7401
C5
68
μ
F
20V
C6
68
μ
F
20V
C8
0.1
μ
F
3
5
7
6
8
2
4
9
1
10
V
OUT
= 12V @ 0.5A
C1
68
μ
F
20V
L1
4.7
μ
H
Figure 2. MAX669 High-Voltage Bootstrapped Configuration
MAX669
LDO
CS+
REF
FREQ
V
CC
SYNC/
SHDN
PGND
FB
GND
N1
EXT
V
IN
= 1.8V to 5V
C3
0.22
μ
F
C2
1
μ
F
R4
100k
1%
R1
0.02
R2
75k
1%
R3
24.9k
1%
C7
220pF
D1
MBRS340T3
FDS6680
IRF7401
C4
68
μ
F
10V
C5
68
μ
F
10V
C6
0.1
μ
F
3
5
7
6
8
2
4
9
1
10
V
OUT
= 5V @ 1A
C1
68
μ
F
10V
L1
4.7
μ
H
Figure 3. MAX669 Low-Voltage Bootstrapped Configuration
Bootstrapped Operation
With bootstrapped operation, the IC is powered from
the circuit output (V
OUT
). This improves efficiency
when the input voltage is low, since EXT drives the FET
with a higher gate voltage than would be available from
the low-voltage input. Higher gate voltage reduces the
FET on-resistance, increasing efficiency. Other (unde-
sirable) characteristics of bootstrapped operation are
increased IC operating power (since it has a higher
operating voltage) and reduced ability to start up with
high load current at low input voltages. If the input volt-
age range extends below 2.7V, then bootstrapped
operation with the MAX669 is the only option.
With V
CC
connected to V
OUT
, as in Figure 2, EXT volt-
age swing is 5V when V
CC
is 5.2V or more, and V
CC
-
0.2V when V
CC
is less than 5.2V. If the output voltage
does not exceed 5.5V, the on-chip regulator can be
disabled by connecting V
CC
to LDO (Figure 3). This
eliminates the LDO forward drop and supplies maxi-
mum gate drive to the external FET.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX669EUB | 1.8V to 28V Input, PWM Step-Up Controllers in レMAX |
| MAX668 | Quadruple 2-Line To 1-Line Data Selector/Multiplexer With 3-State Outputs 20-LCCC -55 to 125 |
| MAX669 | QUADRUPLE 2-INPUT POSITIVE-OR GATES 14-CDIP -55 to 125 |
| MAX668EUB | 1.8V to 28V Input, PWM Step-Up Controllers in レMAX |
| MAX6687AU75H | Local/Remote Temperature Switches in a レMAX Package |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX66901-K00# | 功能描述:射頻識別變換器工具 MAX66901 RF Eval Kit RoHS:否 制造商:Olimex Ltd. 產(chǎn)品:RFID Readers 用于:ISO15693 |
| MAX66902-K00# | 功能描述:射頻識別變換器工具 HF DEVELOPER KIT RoHS:否 制造商:Olimex Ltd. 產(chǎn)品:RFID Readers 用于:ISO15693 |
| MAX66903-K00 | 功能描述:射頻識別變換器工具 MAX6100/20/40 Eval Kit RoHS:否 制造商:Olimex Ltd. 產(chǎn)品:RFID Readers 用于:ISO15693 |
| MAX6690MEE | 功能描述:板上安裝溫度傳感器 RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準(zhǔn)確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數(shù)字輸出 - 總線接口:2-Wire, I2C, SMBus 電源電壓-最大:5.5 V 電源電壓-最小:4.5 V 最大工作溫度:+ 50 C 最小工作溫度:0 C 關(guān)閉: 安裝風(fēng)格: 封裝 / 箱體: 設(shè)備功能:Temperature and Humidity Sensor |
| MAX6690MEE+ | 功能描述:板上安裝溫度傳感器 Remote/Local Temperature Sensor RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準(zhǔn)確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數(shù)字輸出 - 總線接口:2-Wire, I2C, SMBus 電源電壓-最大:5.5 V 電源電壓-最小:4.5 V 最大工作溫度:+ 50 C 最小工作溫度:0 C 關(guān)閉: 安裝風(fēng)格: 封裝 / 箱體: 設(shè)備功能:Temperature and Humidity Sensor |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。