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参数资料
| 型号： | MAX5953BUTM+ |
| 厂商： | Maxim Integrated |
| 文件页数： | 10/27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： | 43 |
| 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： | 管件 |
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IEEE 802.3af PD Interface and PWM Controllers
with Integrated Power MOSFETs
10 ______________________________________________________________________________________
Pin Description
PIN
NAME
FUNCTION
1, 2, 3, 5, 7, 12, 13, 14, 17,
19, 35, 38, 46, 47, 48
N.C.
No Connection. Not internally connected. Make no electrical connection to these pins.
4
V+
Positive Input Power. Referenced to V
EE
.
6
MAX
A MAX
UVLO
Undervoltage Lockout Programming Input for PD Interface. UVLO is referenced to V
EE
.
When UVLO is above its threshold, the device enters the power mode. Connect UVLO to
V
EE
to use the default undervoltage lockout threshold. Connect UVLO to the center of an
external resistor-divider between V+ and V
EE
to define a threshold externally. The series
resistance value of the external resistors must add to 25.5k& (?%) and replaces the
detection resistor. To keep the device in undervoltage lockout, drive UVLO between
V
TH,G,UVLO
and V
REF,UVLO
.
6
MAX
B MAX
D
N.C.
No Connection. Not internally connected. Make no electrical connection to this pin.
8
RCLASS
Classification Setting for PD Interface. RCLASS is referenced to V
EE
. Add a resistor from
RCLASS to V
EE
to set a PD class (see Tables 1 and 2).
9
GATE
Gate of Internal Isolation n-Channel Power MOSFET. GATE is referenced to V
EE
. GATE
sources 10礎 when the device enters power mode. Connect an external 100V ceramic
capacitor from GATE to OUT to program the inrush current. Drive GATE to V
EE
to turn off
the internal MOSFET. The detection and classification functions operate normally when
GATE is driven to V
EE
.
10, 11
V
EE
Negative Input Power. Source of the integrated isolation n-channel power MOSFET.
15, 16
OUT
Output Voltage. OUT is referenced to V
EE
. OUT is connected to the drain of the integrated
isolation n-channel power MOSFET. Connect OUT to GND.
18
MAX
A MAX
B
PGOOD
Active-High, Open-Drain Power-Good Indicator Output for PD Interface. PGOOD is
referenced to OUT. PGOOD goes high impedance when V
OUT
is within 1.2V of V
EE
and
when V
GATE
is 5V above V
EE
. Otherwise, PGOOD is internally pulled to OUT (given that
V
OUT
is at least 5V below V+). PGOOD can be connected directly to CSS or DCUVLO to
enable/disable the DC-DC converter.
18
MAX
MAX
D
PGOOD
Active-Low, Open-Drain Power-Good Indicator Output for PD Interface. PGOOD is
referenced to V
EE
. PGOOD is pulled to V
EE
when V
OUT
is within 1.2V of V
EE
and when
V
GATE
is 5V above V
EE
. Otherwise, PGOOD goes high impedance.
20
CS
Current-Sense Input for PWM Controller. CS is referenced to PGND. The current-limit
threshold is internally set to 156mV relative to PGND. The device has an internal noise filter.
If necessary, connect an external RC filter from CS to PGND for additional filtering.
21
PPWM
PWM Pulse Output. Referenced to GND. PPWM leads the internal power MOSFET pulse by
approximately 100ns.
22
GND
Signal Ground of PWM Controller. Connect GND to PGND.
23
PGND
Power Ground of the DC-DC Converter Power Stage. Connect PGND to GND.
24
CSS
Soft-Start Timing Capacitor Connection for PWM Controller. CSS is referenced to GND.
Connect a 0.01礔 or greater ceramic capacitor from CSS to GND. Connect to PGOOD to
automatically enable the PWM controller from the PD interface.
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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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