- 您现在的位置：买卖IC网 > PDF目录383329 > MAX1630 (Maxim Integrated Products, Inc.) Multi-Output, Low-Noise Power-Supply Controllers for Notebook Computers PDF资料下载
参数资料
| 型号： | MAX1630 |
| 厂商： | Maxim Integrated Products, Inc. |
| 英文描述： | Multi-Output, Low-Noise Power-Supply Controllers for Notebook Computers |
| 中文描述： | 多输出、低噪声电源控制器，用于笔记本电脑 |
| 文件页数： | 15/28页 |
| 文件大小： | 237K |
| 代理商： | MAX1630 |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页当前第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页
M
Multi-Output, Low-Noise Power-S upply
Controllers for Notebook Computers
______________________________________________________________________________________
15
Table 4. Operating Modes
SEQ
RUN/ON3
DESCRIPTION
X
Low
X
All circuit blocks turned off. Supply current = 4μA.
SHDN
TIME/ON5
X
MODE
Shutdown
Low
Standby
Low
High
Ref
Both SMPSs off. Supply current = 30μA.
Low
Run
High
High
Run
Low
High
Ref
5V SMPS enabled/3.3V off
High
Ref
3.3V SMPS enabled/5V off
High
Run
High
Timing capacitor
Standby
Low
High
GND
Both SMPSs off. Supply current = 30μA.
Timing capacitor
Run
High
Timing capacitor
Standby
Low
High
VL
Both SMPSs off. Supply current = 30μA.
High
High
Ref
Both SMPSs enabled
GND
Both SMPSs enabled. 5V enabled before 3.3V.
Timing capacitor
Run
High
High
VL
Both SMPSs enabled. 3.3V enabled before 5V.
X = Don’t Care
S hutdown Mode
Holding
SHDN
low puts the IC into its 4μA shutdown
mode.
SHDN
is logic input with a threshold of about 1V
(the V
TH
of an internal N-channel MOSFET). For auto-
matic start-up, bypass
SHDN
to GND with a 0.01μF
capacitor and connect it to V+ through a 220k
resistor.
Power-Up S equenc ing
and ON/
OFF
Controls
Start-up is controlled by RUN/ON3 and TIME/ON5 in
conjunction with SEQ. With SEQ tied to REF, the two
control inputs act as separate ON/
OFF
controls for
each supply. With SEQ tied to VL or GND, RUN/ON3
becomes the master ON/
OFF
control input and
TIME/ON5 becomes a timing pin, with the delay
between the two supplies determined by an external
capacitor. The delay is approximately 800μs/nF. The
+3.3V supply powers-up first if SEQ is tied to VL, and
the +5V supply is first if SEQ is tied to GND. When driv-
ing TIME/ON5 as a control input with external logic,
always place a resistor (>1k
) in series with the input.
This prevents possible crowbar current due to the inter-
nal discharge pull-down transistor, which turns on in
standby mode and momentarily at the first power-up or
in shutdown mode.
RESET
Power-Good V oltage Monitor
The power-good monitor generates a system
RESET
sig-
nal. At first power-up,
RESET
is held low until both the
3.3V and 5V SMPS outputs are in regulation. At this point,
an internal timer begins counting oscillator pulses, and
RESET
continues to be held low until 32,000 cycles have
elapsed. After this timeout period (107ms at 300kHz or
160ms at 200kHz),
RESET
is actively pulled up to VL. If
SEQ is tied to REF (for separate ON3/ON5 controls), only
the 3.3V SMPS is monitored—the 5V SMPS is ignored.
Output Undervoltage S hutdown Protec tion
(MAX 1630/MAX 1631/MAX 1632)
The output undervoltage lockout circuit is similar to
foldback current limiting, but employs a timer rather
than a variable current limit. Each SMPS has an under-
voltage protection circuit that is activated 6144 clock
cycles after the SMPS is enabled. If either SMPS output
is under 70% of the nominal value, both SMPSs are
latched off and their outputs are clamped to ground by
the synchronous rectifier MOSFETs (see Output
Overvoltage Protection section). They won’t restart until
SHDN
or RUN/ON3 is toggled, or until V+ power is
cycled below 1V. Note that undervoltage protection can
make prototype troubleshooting difficult, since you
have only 20ms or 30ms to figure out what might be
wrong with the circuit before both SMPSs are latched
off. In extreme cases, it may be useful to substitute the
MAX1633/MAX1634/MAX1635 into the prototype
breadboard until the prototype is working properly.
Output Overvoltage Protec tion
(MAX 1630/MAX 1631/MAX 1632)
Both SMPS outputs are monitored for overvoltage. If
either output is more than 7% above the nominal regu-
lation point, both low-side gate drivers (DL_) are
latched high until
SHDN
or RUN/ON3 is toggled, or until
V+ power is cycled below 1V. This action turns on the
synchronous rectifiers with 100% duty, in turn rapidly
discharging the output capacitors and forcing both
SMPS outputs to ground. The DL outputs are also kept
high whenever the corresponding SMPS is disabled,
and in shutdown if VL is sustained.
相关PDF资料 |
PDF描述 |
|---|---|
| MAX1631 | Multi-Output, Low-Noise Power-Supply Controllers for Notebook Computers |
| MAX1631CAI | Multi-Output, Low-Noise Power-Supply Controllers for Notebook Computers |
| MAX1631EAI | Multi-Output, Low-Noise Power-Supply Controllers for Notebook Computers |
| MAX1632 | Multi-Output, Low-Noise Power-Supply Controllers for Notebook Computers |
| MAX1632CAI | Multi-Output, Low-Noise Power-Supply Controllers for Notebook Computers |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1630CAI | 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 |
| MAX1630CAI+ | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX1630CAI-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 |
| MAX1630EAI | 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 |
| MAX1630EAI-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 |
发布紧急采购，3分钟左右您将得到回复。