參數(shù)資料
型號： P95020NQG8
廠商： INTEGRATED DEVICE TECHNOLOGY INC
元件分類： 電源管理
英文描述： 2-CHANNEL POWER SUPPLY MANAGEMENT CKT, QCC132
封裝： 10 X 10 MM, 0.85 MM HEIGHT, QFN-132
文件頁數(shù)： 12/169頁
文件大?。?/td> 4297K
代理商： P95020NQG8
IDTP95020
Product Datasheet
September 2, 2011 Revision 1.3 Final
109
2011 Integrated Device Technology, Inc.
The Voltage value in the Output Voltage Register may be
changed during the Soft Start sequence.
Peak Current Limiting
During normal operation the BOOST5 converter provides
Cycle-by-Cycle current limiting. If the output voltage drops
below VIN then current limiting is no longer possible (See
Startup and Soft-Start section on Page 108).
Boost5 – Output Diode
Use a Schottky diode as shown in Figure 32 such as an
MSS1P5-E3/89A or equivalent if the converter output
voltage is 4.5V or greater. The Schottky diode carries the
output current for the time it takes for the synchronous
rectifier to turn on. Do not use ordinary rectifier diodes,
since the slow recovery times will compromise efficiency.
A Schottky diode is optional for output voltages below
4.5V.
Boost5 - Application
VIN (3.0 to 4.5V) typically comes from VSYS.
The approximate output current capability versus VIN
value is given in the equation below.
()
D
1
f
L
2
V
D
IL
I
IN
peak
OUT
×
×
×
η
=
(6)
Where:
η = estimated efficiency
ILOUT-PEAK = peak current limit value (1.5A)
VIN = Input voltage
D = steady-state duty ratio = (VOUT - VIN )/ VOUT
f = switching frequency (1.0MHz typical)
L = inductance value (2.2uH)
BOOST5 provides 4.05 to 5.0V to the CLASS_D Audio
Power Bridge and (optionally) LDOs requiring 5V input.
Figure 34. Boost5 Application Diagram
This block DOES NOT PROVIDE full short circuit
protection. When the output voltage drops below the input
voltage there is a direct path through the inductor and
internal synchronous rectifier (SR1) directly to the output
capacitor. The BOOST5 power supply block is designed
to provide power to the CLASS_D Audio Amplifier and
LDOs requiring input voltage greater than the system
voltage. External devices powered by this IP block are
expected to provide their own short circuit protection.
Input Capacitors
The input capacitors CIN should be located as physically
close as possible to the inductor L and power ground
(BOOST5_GND). Ceramic capacitors are recommended
for their higher current operation and small profile. Also,
ceramic capacitors are inherently capable to withstand
input current surges from low impedance sources such as
batteries in portable devices than are tantalum capacitors.
Typically, 6.3V rated capacitors are required. See Table
173 for recommended external components.
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