参数资料
| 型号： | SC900841JVKR2 |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 79/192页 |
| 文件大小： | 0K |
| 描述： | IC POWER MGT 338-MAPBGA |
| 标准包装： | 2,000 |
| 应用： | PC，PDA |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 338-TFBGA |
| 供应商设备封装： | 338-MAPBGA |
| 包装： | 带卷 (TR) |
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FUNCTIONAL DEVICE OPERATION
POWER SUPPLIES
VYMXPA
This is a 2.0 MHz non-synchronous Boost PWM current-
mode control DC/DC regulator with internal low side FET.
VYMXPA is designed to supply the Power Amplifier for the
WiMAX module, it provides a fixed 4.2V output voltage, and
capability to supply up to 700 mA of drive current. It can also be
used to support many applications that need a 5.0 V supply
voltage, as in motor drives and high current OTG Buses. If
used as a 5.0 V supply then the current capability is limited to
a 500 mA maximum.
Since the output of VYMXPA is close to the maximum
battery voltage, at very high battery input voltage conditions,
the output will track the battery voltage minus a diode forward
voltage drop (output is directly connected to the input through
the inductor and an external diode).
Due to the possible need to isolate the output of VYMXPA
boost from the actual load, an external PMOS switch (M YMXPA )
will be used to switch in VYMXPA output to the load, as shown
in Figure 13 . M YMXPA is always enabled and if it is not needed,
then do not populate the switch and ground the YMXPAGTIN
and YMXPAGT pins.
When M YMXPA is used, then users can either connect the
feedback node after or before the switch. Accuracy is
maintained where the feedback node is connected. The output
capacitor C OYMXPA can also connect to either node but is
recommended to follow the feedback node connection.
VYMXPA can be discharged only if M YMXPA is used and the
feedback node is taken after the switch. The discharge FET is
connected internally to the FBYMXPA pin. If M YMXPA is not
used, then the discharge FET should be disabled by setting the
VYMXPADISDSCH bit, since VYMXPA cannot be discharged
due to the lack of an isolation FET (the output is directly
connected to the input through the inductor and an external
diode).
Since VYMXPA is supplying the power amplifier of a WiMAX
module, it can be presented with a high load transient current,
so close attention to the VYMXPA transient response is in
order here to account for these possible load changes.
VYMXPA includes under-voltage, over-voltage, over-
current, and short-circuit protection.
V PWR
L YMXPA
C INYMXPA
V OYMXPA
D YMXPA
SWYMXPA
Driver
CTLVYMX3GPA
AOACCTLVYMX3GPA
SELVYMX 3GPA
PGNDYMXPA
R SENSE
V REFSC
OC
VYMXPADISDSCH
SC
Controller
M YMXPA is an Optional Isolation Switch
If not used then
Connect YMXPAGTIN and YMXPAGT to GND
M YMXPA
YMXPAGTIN
YMXPAGT
V REFUV
V REFOV
Driver
UV
OV
VYMXPAFAULT
SPI
Interface
Then short V OYMXPA to FBYMXPA pin
FBYMXPA
C OYMXPA
Load
Internal
Compensation Z2
Z1
EA
V REF
Discharge FET
Figure 35. VYMXPA Detailed Internal Block Diagram
Under-voltage Detection
VYMXPA features an output under-voltage detection
comparator that serves as an output ready signal, along with
the absence of faults. When VYMXPA is turned on, a
VYMXPAFAULT is asserted, the under-voltage comparator is
turned on, and V OYMXPA starts ramping up. When V OYMXPA
(measured at FBYMXPA) reaches a steady state,
VYMXPAFAULT is de-asserted to indicate the VYMXPA output
readiness to start. During operation, if the output voltage is
decreased below the under-voltage threshold, an under-
voltage condition is detected, and VYMXPAFAULT is asserted.
If the output voltage rises above the under-voltage threshold
plus hysteresis, the VYMXPAFAULT signal is cleared,
assuming no other faults are occurring.
Over-current Protection
VYMXPA limits the peak inductor current by sensing the
switch MOSFET current. The over-current threshold value is
set higher than the worst peak inductor current value. If an
over-current is detected, the switch MOSFET turns off, the
VYMXPAFAULT flag is asserted, and the regulator goes into a
cycle by cycle current limiting until the fault is serviced. If the
900841
Analog Integrated Circuit Device Data
Freescale Semiconductor
79
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