MAX5971A Maxim Integrated Products, MAX5971A Datasheet - Page 11

• Manufacturer Part Number: MAX5971A
• Description: Single-Port 40W IEEE 802.3af/at PSE Controller with Integrated MOSFET
• Manufacturer: Maxim Integrated Products

8–11, 15
1, 2, 3
PIN
12
4
5
6
7
Single-Port, 40W, IEEE 802.3af/802.3at PSE
MIDSPAN
PWMEN
V
NAME
ILIM1
ILIM2
EE_DIG
______________________________________________________________________________________
V
I.C.
EE
Analog Low-Side Supply Input. Bypass with an external 100V, 47FF capacitor in parallel with a
100V, 0.1FF ceramic capacitance between AGND and V
Class 5 Current-Limit Digital Adjust 1. Referenced to V
supply. Use ILIM1 with ILIM2 to enable Class 5 operation and to adjust the Class 5 current-limit
value. See the Electrical Characteristics table and Table 3 in the Class 5 PD Classification section
for details.
Class 5 Current-Limit Digital Adjust 2. Referenced to V
supply. Use ILIM2 with ILIM1 to enable Class 5 operation and to adjust the Class 5 current-limit
value. See the Electrical Characteristics table and Table 3 in the Class 5 PD Classification section
for details.
PWM Control Logic Input. Referenced to V
ply. Leave unconnected to enable the internal PWM to drive the LED pin. Force low to disable the
internal PWM.
Detection Collision Avoidance Logic Input. Referenced to V
to the digital supply. Leave unconnected to activate the detection collision avoidance circuitry
for midspan PSE systems. Force low to disable this function for an end-point PSE system. The
MIDSPAN logic level latches after the device is powered up or after a reset condition.
Internally Connected. Connect I.C. to V
Digital Low-Side Supply Input. Connect to V
Controller with Integrated MOSFET
*EXPOSED PAD, CONNECT TO AGND.
TOP VIEW
OUTP
N.C.
N.C.
OUT
OUT
N.C.
DET
22
23
24
25
26
27
28
21
1
+
20
2
THIN QFN
19
MAX5971A
3
18
4
17
5
EE
*EP
.
16
6
EE
FUNCTION
EE
. PWMEN is internally pulled up to the digital sup-
15
7
externally.
14
13
12
11
10
9
8
EN
LEGACY
V
I.C.
I.C.
I.C.
I.C.
EE
EE
EE_DIG
EE
. ILIM1 is internally pulled up to the digital
. ILIM2 is internally pulled up to the digital
.
EE
. MIDSPAN is internally pulled up
Pin Configuration
Pin Description
11