EP5358HUI Enpirion, EP5358HUI Datasheet - Page 10

• Manufacturer Part Number: EP5358HUI
• Description: DC/DC Switching Converters 500mA Sync Buck Conv Int Inductor, Hi VID
• Manufacturer: Enpirion

Specifications of EP5358HUI

• Mounting Style: SMD/SMT
• Duty Cycle (max): 100 %
• Efficiency: 93 %
• Input / Supply Voltage (max): 6 V
• Input / Supply Voltage (min): - 0.3 V
• Load Regulation: 0.48 %
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Output Current: 500 mA
• Switching Frequency: 5 MHz
• Package / Case: QFN-16
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Excess bulk capacitance on the output of the
device can cause an over-current condition at
startup.
the output, including the output filter capacitor
and bulk and decoupling capacitance, at the
load, is given as:
EP5358LUI:
C
EP5358HUI:
C
EP5358LUI in external divider mode:
C
The above numbers and formula assume a no
load condition.
Over Current/Short Circuit Protection
The current limit function is achieved by
sensing the current flowing through a sense P-
MOSFET which is compared to a reference
current. When this level is exceeded the P-
FET is turned off and the N-FET is turned on,
pulling V
for approximately 0.5mS and then a normal
soft start is initiated.
condition still persists, this cycle will repeat.
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03541
OUT_TOTAL_MAX
OUT_TOTAL_MAX
OUT_TOTAL_MAX
OUT
The maximum total capacitance on
low. This condition is maintained
= C
= C
= 2.086x10
OUT_Filter
OUT_Filter
-4
If the over current
+ C
+ C
/V
OUT
OUT_BULK
OUT_BULK
Farads
= 230uF
= 115uF
09/23/2010
10
Under Voltage Lockout
During initial power up an under voltage
lockout circuit will hold-off the switching
circuitry until the input voltage reaches a
sufficient level to insure proper operation. If
the voltage drops below the UVLO threshold
the lockout circuitry will again disable the
switching.
chattering between states.
Enable
The ENABLE pin provides a means to shut
down
operation.
converter and cause it to shut down. A logic
high will enable the converter into normal
operation.
NOTE:
floating.
Thermal Shutdown
When excessive power is dissipated in the
chip, the junction temperature rises. Once the
junction temperature exceeds the thermal
shutdown temperature the thermal shutdown
circuit turns off the converter output voltage
thus allowing the device to cool. When the
junction temperature decreases by 15C° , the
device will go through the normal startup
process.
the
The ENABLE pin must not be left
Hysteresis is included to prevent
converter
A logic low will disable the
EP5358LUI/EP5358HUI
or
www.enpirion.com
enable
normal
Rev: D