- 您现在的位置：买卖IC网 > PDF目录14392 > MAX5073ETI+ (Maxim Integrated Products)IC REG BUCK BST ADJ 1A/2A 28TQFN PDF资料下载
参数资料
| 型号： | MAX5073ETI+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 14/25页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK BST ADJ 1A/2A 28TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 60 |
| 类型： | 降压（降压），升压（升压） |
| 输出类型： | 可调式 |
| 输出数： | 2 |
| 输出电压： | 0.8 V ~ 28 V |
| 输入电压： | 4.5 V ~ 23 V |
| PWM 型： | 电压模式 |
| 频率 - 开关： | 200kHz ~ 2.2MHz |
| 电流 - 输出： | 1A，2A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-WFQFN 裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 28-TQFN-EP（5x5） |
2.2MHz, Dual-Output Buck or Boost Converter
with Internal Power MOSFETs
Enable
The MAX5073 dual converter provides separate enable
inputs EN1 and EN2 to individually control or sequence
the output voltages. These active-high enable inputs are
TTL compatible. Pulling EN_ high ramps up the reference
slowly, which provides soft-start at the outputs. Forcing
the EN_ low externally disables the individual output and
generates a PGOOD_ signal. Use EN1, EN2, and
PGOOD1 for sequencing (see Figure 4). Connect
PGOOD1 to EN2 to make sure converter 1’s output is
within regulation before converter 2 starts. Add an RC
network from VL to EN1 and EN2 to delay the individual
converter. A larger RC time constant means a more
delayed output. Sequencing reduces input inrush current
and possible chattering. Connect the EN_ to VL for
always-on operation.
PGOOD_
Converter 1 and converter 2 includes a power-good flag,
PGOOD1 and PGOOD2, respectively. Since PGOOD is
an open-drain output and can sink 3mA while providing
the TTL logic-low signal, pull PGOOD to a logic voltage
to provide a logic-level output. PGOOD goes low when
converter 1’s output drops to 92.5% of its nominal regu-
lated voltage. Connect PGOOD to SGND or leave uncon-
nected if not used.
V IN
VL
Current Limit
The internal switch current of each converter is sensed
using an internal current mirror. Converter 1 and con-
verter 2 have 2A and 1A internal switches. When the
peak switch current crosses the current-limit threshold
of 3A (typ) and 1.8A (typ) for converter 1 and converter
2, respectively, the on cycle is terminated immediately
and the inductor is allowed to discharge. The next
cycle resumes at the next clock pulse.
In deep overload or short-circuit conditions when the
FB voltage drops below 0.4V, the switching frequency
is reduced to 1/4 x f SW to provide sufficient time for the
inductor to discharge. During overload conditions, if the
voltage across the inductor is not high enough to allow
for the inductor current to properly discharge, current
runaway may occur. Current runaway can destroy the
device in spite of internal thermal-overload protection.
Reducing the switching frequency during overload con-
ditions prevents current runaway.
Thermal-Overload Protection
During continuous short circuit or overload at the output,
the power dissipation in the IC can exceed its limit.
Internal thermal shutdown is provided to avoid irreversible
damage to the device. When the die temperature or junc-
tion temperature exceeds +150°C, an on-chip thermal
sensor shuts down the device, forcing the internal switch-
es to turn off, allowing the IC to cool. The thermal sensor
turns the part on again after the junction temperature
cools by +30°C. During thermal shutdown, both regula-
tors shut down, PGOOD_ go low, and soft-start resets.
V IN
VL
VL
V+
VL
V+
OUTPUT2
DRAIN2
DRAIN1
OUTPUT1
OUTPUT2
DRAIN2
DRAIN1
OUTPUT1
SOURCE2
SOURCE1
SOURCE2
SOURCE1
MAX5073
MAX5073
FB2
FB1
R2
FB2
FB1
R1
VL
EN2
EN1
VL
VL
EN2
EN1
VL
PGOOD1
SEQUENCING—OUTPUT 2 DELAYED WITH RESPECT TO OUTPUT 1.
Figure 4. Power-Supply Sequencing Configurations
C2
R1/C1 AND R2/C2 ARE SIZED FOR REQUIRED SEQUENCING.
C1
14
______________________________________________________________________________________
相关PDF资料 |
PDF描述 |
|---|---|
| MAX764CPA+ | IC REG INV -5V/ADJ 0.26A 8DIP |
| MAX635ACPA+ | IC REG INV -5V/ADJ 50MA 8DIP |
| MAX6833FXRD3+T | IC MPU SUPERVISOR SC70-3 |
| MAX738ACPA+ | IC REG BUCK 5V 0.75A 8DIP |
| MAX6838XSD0+T | IC MPU SUPERVISOR SC70-4 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX5073ETI+ | 功能描述:直流/直流开关转换器 2.2MHz Buck or Boost Converter RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MAX5073ETI+T | 功能描述:直流/直流开关转换器 2.2MHz Buck or Boost Converter RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MAX5073ETI-T | 功能描述:直流/直流开关转换器 2.2MHz Buck or Boost Converter RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MAX5073ETJ | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube |
| MAX5074AAUP+T | 制造商:Maxim Integrated Products 功能描述: |
发布紧急采购，3分钟左右您将得到回复。