SC900841JVKR2 Freescale Semiconductor, SC900841JVKR2 Datasheet - Page 80

• Manufacturer Part Number: SC900841JVKR2
• Description: IC POWER MGT 338-MAPBGA
• Manufacturer: Freescale Semiconductor

Specifications of SC900841JVKR2

• Applications: PC's, PDA's
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 338-TBGA
• Input Voltage: 2.8 V to 4.4 V
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Supply: -
• Voltage - Supply: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

output current falls below the over-current threshold, normal
operation is regained and the VYMXPAFAULT is cleared,
assuming no other faults are occurring.
Short-circuit Protection
currents, in case of an output short, by detecting the voltage
on the feedback pin FBYMXPA. If the FBYMXPA voltage falls
below a set threshold, VYMXPA detects a short-circuit, turns
off VYMXPA, turns off the isolation switch, and asserts the
VYMXPAFAULT flag. There is no automatic restart after this
event, and VYMXPA has to be re-enabled in order to clear
the VYMXPAFAULT flag.
prevent false or premature detection of a short-circuit
condition, as the block will be subjected to an inrush current
possibly higher than the trip threshold. If a short were already
present when starting up, soft start would end after about
4.0 ms, SC is detected, and the boost is disabled as
described.
Over-voltage Protection
comparator that senses the output voltage through an
internal resistor divider connected at FBYMXPA pin,
compares it to an internal reference, and shuts down the
80
900841
FUNCTIONAL DEVICE OPERATION
POWER SUPPLIES
VYMXPA protects the internal MOSFET from excessive
Short-circuit protection is disabled during soft start, to
VYMXPA features an output over-voltage protection
Figure 36. VYMXPA Efficiency Curves (V
regulator, in the case an excessive voltage occurs for any
reason, and asserts the VYMXPAFAULT flag. The over-
voltage threshold is fixed at a 5.77 V typical. There is no
automatic restart after this event. VYMXPA has to be re-
enabled in order to clear the VYMXPAFAULT flag.
Main Features
• Supplies the power amplifier of a WiMAX module.
• Uses the V
• Supports up to 700 mA (500 mA) of output current at 4.2 V
• 2.0 MHz switching frequency
• Uses internal compensation
• Soft Start feature to minimize inrush currents at power up
• Uses internal low side switch MOSFET
• Gate drive circuits are supplied directly from V
• Output over-voltage, under-voltage, over-current, and
• External switch control for output isolation when needed
Efficiency Curves
the recommended external component values and typical
output voltage. 3.0 V ≤ VPWR ≤ 4.4 V. Curves below do not
take in account the switch drop across M
(5.0 V) fixed output voltage
short-circuit protection
The following efficiency curves are calculated based on
OYMXPA
PWR
rail as its power supply
= 4.2 V)
Analog Integrated Circuit Device Data
Freescale Semiconductor
YMXPA.
PWR