MAX5910ESA+ Maxim Integrated Products, MAX5910ESA+ Datasheet - Page 9

• Manufacturer Part Number: MAX5910ESA+
• Description: IC HOT-SWAP SWITCH 65V 8-SOIC
• Manufacturer: Maxim Integrated Products
• Series: Simple Swapper™r
• Type: Hot-Swap Switchr

Specifications of MAX5910ESA+

• Applications: IP Phones, Power over LAN, Network Routers and Switches
• Internal Switch(s): Yes
• Current Limit: 280mA
• Voltage - Supply: 10 V ~ 65 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (0.154", 3.90mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

The MAX5910/MAX5917 monitor their internal die tem-
perature. If the temperature of the die exceeds +140°C,
the internal FET is turned off and IFAULT and PGOOD
are pulled low. The output is enabled again only when
the die temperature is below the thermal shutdown tem-
perature by 3.5°C typically.
Power-good (PGOOD) logic output signals when the
output has exceeded the PGOOD threshold. When the
output voltage is below 70% of the input voltage,
PGOOD is pulled low. When the output voltage is larger
than 80% of the input voltage for more than 12ms,
PGOOD is asserted.
The MAX5910 can output 280mA, the MAX5917B can
output 420mA, and the MAX5917A can output up to
567mA. In applications where high power is expected,
use the MAX5917 for its superior heat dissipation prop-
erties, and always solder all of its GND pins to a large
section of circuit board copper.
The enable input (ENABLE) responds to 3.3V logic sig-
nals and will force the internal FET off if ENABLE is
pulled low. This feature allows the host to disconnect
the load from the power bus if required. Drive ENABLE
high to enable V
The undervoltage lockout (UVLO) value defaults to
26.5V if the UVLO pin is left open circuit (Figure 3).
Connect UVLO to V
a minimum of 7.5V (Figure 4). This lockout voltage can
also be changed with a resistive-divider from V
GND. The center node of the divider is connected to
the UVLO pin (Figure 5). The values of R1 and R2 must
satisfy the condition R1//R2 << 260k
1.65M . R2 can be calculated as follows:
where V
IN (UVLO)
Changing the Undervoltage Lockout
R2 = R1
+65V Simple Swapper Hot-Swap Switches
Applications Information
OUT
is the desired lockout voltage.
_______________________________________________________________________________________
IN
.
✕
to set the undervoltage lockout to
[(V
Thermal Shutdown Fault
UVLO
Power-Good (PGOOD)
Choosing a Device
/ 7.5V) - 1]
Logic Control
and R2 <<
Setting
IN
to
Figure 3. UVLO is Set Internally to its +26.5V Default Value
Figure 4. Minimum +7.5V UVLO Configuration
Figure 5. Adjusting UVLO with an External Resistive-Divider
V
IN
V
IN
0.1 F
V
R2
R1
IN
0.1 F
V
UVLO
ENABLE
N.C.
V
UVLO
ENABLE
N.C.
IN
IN
V
UVLO
ENABLE
N.C.
IN
MAX5910
MAX5910
MAX5910
IFAULT
PGOOD
PGOOD
IFAULT
V
V
GND
GND
OUT
PGOOD
OUT
IFAULT
V
GND
OUT
+3.3V
+3.3V
10k
R
+3.3V
V
V
10k
OUT
OUT
V
R
10k
OUT
10k
9