- 您现在的位置：买卖IC网 > PDF目录22319 > MAX1999EEI+T (Maxim Integrated)IC REG QD BCK/LINEAR SYNC 28QSOP PDF资料下载
参数资料
| 型号： | MAX1999EEI+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 23/32页 |
| 文件大小： | 0K |
| 描述： | IC REG QD BCK/LINEAR SYNC 28QSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 拓扑： | 降压（降压）同步（2），线性（LDO）（2） |
| 功能： | 任何功能 |
| 输出数： | 4 |
| 频率 - 开关： | 200kHz ~ 500kHz |
| 电压/电流 - 输出 1： | 控制器 |
| 电压/电流 - 输出 2： | 控制器 |
| 电压/电流 - 输出 3： | 3.3V，100mA |
| 带 LED 驱动器： | 无 |
| 带监控器： | 无 |
| 带序列发生器： | 是 |
| 电源电压： | 4.5 V ~ 24 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 28-QSOP |
| 包装： | 带卷 (TR) |
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页第15页第16页第17页第18页第19页第20页第21页第22页当前第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页
High-Efficiency, Quad Output, Main Power-
Supply Controllers for Notebook Computers
Table 3. Operating Mode Truth Table
MODE
Power-Up
Run
Overvoltage
Protection
Undervoltage
Protection
Discharge
Standby
Shutdown
Thermal Shutdown
CONDITION
LDO5 < UVLO threshold
SHDN = high, ON3 or ON5
enabled
Either output > 111% of
nominal level, PRO = low
Either output < 70% of
nominal after 22ms time-
out expires and output is
enabled, PRO = low
PRO is low and either
SMPS output is still high in
either standby mode or
shutdown mode
ON5, ON3 < startup
threshold, SHDN = high
SHDN = low
T J > +160 ° C
COMMENT
Transitions to discharge mode after a V+ POR and after REF becomes valid.
LDO5, LDO3, REF remain active. DL_ is active if PRO is low.
Normal operation
DL_ is forced high. LDO3, LDO5 active. Exited by a V+ POR or by toggling
SHDN , ON3, or ON5.
If PRO is low, DL_ is forced high after discharge mode terminates. LDO3,
LDO5 active. Exited by a V+ POR or by toggling SHDN , ON3, or ON5.
Discharge switch (12 ? ) connects OUT_ to PGND. One output may still run
while the other is in discharge mode. Activates when LDO_ is in UVLO, or
transition to UVLO, standby, or shutdown has begun. LDO3, LDO5 active.
DL_ stays high if PRO is low. LDO3, LDO5 active.
All circuitry off
All circuitry off. Exited by V+ POR or cycling SHDN , ON3, or ON5.
in shutdown mode. When shutdown mode activates, the
reference turns off, making the threshold to exit shut-
down inaccurate. To guarantee startup, drive SHDN
above 2V ( SHDN input rising-edge trip level). For auto-
matic shutdown and startup, connect SHDN to V+. If
PRO is low, both SMPS outputs are discharged to 0.3V
through a 12 ? switch before entering true shutdown.
The accurate 1V falling-edge threshold on SHDN can be
used to detect a specific analog voltage level and shut
the device down. Once in shutdown, the 1.6V rising-
edge threshold activates, providing sufficient hysteresis
for most applications. For additional hysteresis, the
undervoltage threshold can be made dependent on
REF or LDO_, which go to 0V in shutdown.
Table 4. Power-Up Sequencing
Power-Up Sequencing and
On/Off Controls (ON3, ON5)
ON3 and ON5 control SMPS power-up sequencing.
ON3 or ON5 rising above 2.4V enables the respective
outputs. ON3 or ON5 falling below 1.6V disables the
respective outputs.
Connecting ON3 or ON5 to REF forces the respective
outputs off while the other output is below regulation and
starts after that output regulates. The second SMPS
remains on until the first SMPS turns off, the device shuts
down, a fault occurs, or LDO5 goes into undervoltage
lockout. Both supplies begin their power-down sequence
immediately when the first supply turns off. Driving ON_
SHDN ( V)
< 1.0
> 2.4
> 2.4
> 2.4
> 2.4
> 2.4
> 2.4
V ON3 ( V)
X
< 1.6
> 2.4
> 2.4
< 1.6
> 2.4
REF
V ON5 ( V)
X
< 1.6
> 2.4
< 1.6
> 2.4
REF
> 2.4
LDO5
Off
On
On
On
On
On
On
LDO3
Off
On
On
On
On
On
On
5V SMPS
Off
Off
On
Off
On
On (after 3V
SMPS is up)
On
3V SMPS
Off
Off
On
On
Off
On
On (after 5V
SMPS is up)
______________________________________________________________________________________
23
相关PDF资料 |
PDF描述 |
|---|---|
| ECS-F1HE335K | CAP TANT 3.3UF 50V 20% RADIAL |
| V300C3V3H50BG2 | CONVERTER MOD DC/DC 3.3V 50W |
| AMM18DTMS | CONN EDGECARD 36POS R/A .156 SLD |
| TH3D475M050D0900 | CAP TANT 4.7UF 50V 20% 2917 |
| ADP199ACBZ-R7 | IC HIGH-SIDE LOAD SWITCH 8WLCSP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1999EVKIT | 功能描述:DC/DC 开关控制器 Evaluation Kit for the MAX1777 MAX1977 MAX1999 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 |
| MAX199ACAI | 功能描述:模数转换器 - ADC RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| MAX199ACAI+ | 功能描述:模数转换器 - ADC 12Bit 8Ch 100ksps 4.18V Precision ADC RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| MAX199ACAI+T | 功能描述:模数转换器 - ADC 12Bit 8Ch 100ksps 4.18V Precision ADC RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| MAX199ACAI-T | 功能描述:模数转换器 - ADC RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
发布紧急采购，3分钟左右您将得到回复。