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参数资料
| 型号： | MAX1902EAI |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 500kHz Multi-Output, Low-Noise Power-Supply Controllers for Notebook Computers |
| 中文描述： | 0.2 A DUAL SWITCHING CONTROLLER, 550 kHz SWITCHING FREQ-MAX, PDSO28 |
| 封装： | 5.30 MM, MO-150, SSOP-28 |
| 文件页数： | 10/33页 |
| 文件大小： | 649K |
| 代理商： | MAX1902EAI |
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M
500kHz Multi-Output, Low-Noise Power-Supply
Controllers for Notebook Computers
10
______________________________________________________________________________________
Pin Description (continued)
PIN
QSOP
QFN
NAME
FUNCTION
15
13
SEQ
Pin-strap input that selects the SMPS power-up sequence:
SEQ = GND: 5V before 3.3V,
RESET
output determined by both outputs
SEQ = REF: Separate ON3/ON5 controls,
RESET
output determined by 3.3V
output
SEQ = V
L
: 3.3V before 5V,
RESET
output determined by both outputs
16
14
DH5
Gate-Drive Output for the 5V, High-Side N-Channel Switch. DH5 is a floating driver
output that swings from LX5 to BST5, riding on the LX5 switching node voltage.
17
18
19
20
15
17
18
19
LX5
BST5
DL5
PGND
Switching-Node (Inductor) Connection. Can swing 2V below ground without hazard.
Boost Capacitor Connection for High-Side Gate Drive (0.1μF)
Gate-Drive Output for the Low-Side Synchronous-Rectifier MOSFET. Swings 0 to V
L
.
Power Ground
21
20
VL
5V Internal Linear-Regulator Output. V
L
is also the supply-voltage rail for the chip.
After the 5V SMPS output has reached 4.5V (typ), V
L
automatically switches to the
output voltage through CSL5 for bootstrapping. Bypass to GND with 4.7μF. V
L
supplies up to 25mA for external loads.
22
21
V+
Battery Voltage Input, 4.2V to 30V. Bypass V+ to PGND close to the IC with a 0.22μF
capacitor. Connects to a linear regulator that powers V
L
.
23
22
SHDN
Shutdown Control Input, Active Low. Logic threshold is set at approximately 1V. For
automatic startup, connect
SHDN
to V+ through a 220k
resistor and bypass
SHDN
to
GND with a 0.01μF capacitor.
24
25
26
23
24
26
DL3
BST3
LX3
Gate-Drive Output for the Low-Side Synchronous-Rectifier MOSFET. Swings 0 to VL.
Boost Capacitor Connection for High-Side Gate Drive (0.1μF)
Switching-Node (Inductor) Connection. Can swing 2V below ground without hazard.
27
27
DH3
Gate-Drive Output for the 3.3V, High-Side N-Channel Switch. DH3 is a floating driver
output that swings from LX3 to BST3, riding on the LX3 switching-node voltage.
28
—
28
RUN/ON3
N.C.
ON/
OFF
Control Input. See the
Power-Up Sequencing and ON/
OFF
Controls
section.
No Connection
6, 16, 25, 32
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1902EAI+ | 功能描述:DC/DC 开关控制器 500kHz Multi-Output Power-Supply Ctlr RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX1902EAI+T | 功能描述:DC/DC 开关控制器 500kHz Multi-Output Power-Supply Ctlr RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX1902EAI-T | 功能描述:DC/DC 开关控制器 RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX1904BEAI | 制造商:Maxim Integrated Products 功能描述: |
| MAX1904BEAI+ | 功能描述:DC/DC 开关控制器 500kHz Multi-Output Power-Supply Ctlr RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
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