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| 型号： | MAX5953AUTM+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 11/27页 |
| 文件大小： | 371K |
| 描述： | IC INTERFACE 802.3AF 48TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | 以太网供电开关（PoE） |
| 应用： | 远程外设（工业控制，相机，数据访问） |
| 内部开关： | 是 |
| 电源电压： | 11 V ~ 76 V |
| 工作温度： | 0°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 48-WFQFN 裸露焊盘 |
| 供应商设备封装： | 48-TQFN-EP（7x7） |
| 包装： | 带卷 (TR) |
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IEEE 802.3af PD Interface and PWM Controllers
with Integrated Power MOSFETs
______________________________________________________________________________________ 11
Pin Description (continued)
PIN
NAME
FUNCTION
25
OPTO
PWM Comparator Inverting Input. OPTO is referenced to GND. Connect the collector of the
optotransistor to OPTO and a pullup resistor to REGOUT.
26, 27
SRC
Source Connection of Low-Side Power MOSFET in the Two-Switch Power Stage of the DC-
DC Converter. Connect SRC to PGND with a low-value resistor for current limiting.
28, 29
XFRMRL
Low-Side Connection for the Isolation Transformer. Drain terminal of low-side power
MOSFET in the two-switch power stage of the DC-DC converter.
30
DRVIN
Supply Input for the Gate-Driver of Internal Power MOSFETs. DRVIN is referenced to
PGND. Bypass DRVIN with at least 0.1礔 to PGND. Connect DRVIN to REGOUT.
31, 32
XFRMRH
High-Side Connection for the Isolation Transformer. Source connection of high-side power
MOSFET in the two-switch power stage of the DC-DC converter.
33, 34
DRNH
Drain Connection of High-Side MOSFET in the Two-Switch Power Stage of the DC-DC
Converter. Connect DRNH to the most positive rail of the input supply. Bypass DRNH
appropriately to handle the heavy switching current through the transformer.
36
BST
Boost Input for the DC-DC Converter. BST is the boost connection point for the high-side
MOSFET driver. Connect a minimum 0.1礔 capacitor from BST to XFRMRH with short and
wide PC board traces.
37
DCUVLO
DC-DC Converter Undervoltage Lockout Input. DCUVLO is referenced to GND. Connect a
resistor-divider from HVIN to DCUVLO to GND to set the UVLO threshold.
39
HVIN
DC-DC Converter Positive Input Power Supply. HVIN is referenced to GND. Connect HVIN
to V+.
40
INBIAS
Input from the Rectified Bias Winding to the DC-DC Converter. INBIAS is referenced to
GND. INBIAS is the input to the internal linear voltage regulator (REGOUT).
41
REGOUT
Internal Regulator Output. REGOUT is used for the DC-DC converter gate driver. REGOUT
is referenced to GND. V
REGOUT
is always present as long as HVIN is powered with a
voltage above the DCUVLO threshold. Bypass REGOUT to GND with a minimum 2.2礔
ceramic capacitor.
42
RTCT
Oscillator Frequency Set Input for the PWM Controller. RTCT is referenced to GND.
Connect a resistor from RTCT to REGOUT and a ceramic capacitor from RTCT to GND to
set the oscillator frequency.
43
FLTINT
Fault Integration Input for PWM Controller. FLTINT is referenced to GND. During persistent
current-limit faults, a capacitor connected to FLTINT is charged with an internal 80礎
current source. Switching is terminated when V
FLTINT
reaches 2.7V. An external resistor
connected in parallel discharges the capacitor. Switching resumes when V
FLTINT
drops
to 1.9V.
44
RCFF
Feed-Forward Input for PWM Controller. RCFF is referenced to GND. To generate the PWM
ramp, connect a resistor from RCFF to HVIN and a capacitor from RCFF to GND.
45
RAMP
Ramp Sense Input for PWM Controller. Connect RAMP to RCFF.
EP
Exposed Paddle. EP is internally unconnected and must be connected to V
EE
externally.
To improve power dissipation, solder the exposed paddle to a copper pad on the PC
board.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX5953BUTM+ | 功能描述:电压模式 PWM 控制器 IEEE 802.3af PD Int & PWM Controller RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| MAX5953BUTM+T | 功能描述:电压模式 PWM 控制器 IEEE 802.3af PD Int & PWM Controller RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| MAX5953CUTM+ | 功能描述:电压模式 PWM 控制器 IEEE 802.3af PD Int & PWM Controller RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| MAX5953CUTM+T | 功能描述:电压模式 PWM 控制器 IEEE 802.3af PD Int & PWM Controller RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| MAX5953DUTM+ | 功能描述:电压模式 PWM 控制器 IEEE 802.3af PD Int & PWM Controller RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
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