參數(shù)資料
型號(hào)： PC34704BEP
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： 電源管理
英文描述： 8-CHANNEL POWER SUPPLY MANAGEMENT CKT, QCC56
封裝： 7 X 7 MM, 1 MM HEIGHT, 0.40 MM PITCH, ROHS COMPLIANT, QFN-56
文件頁(yè)數(shù)： 19/50頁(yè)
文件大?。?/td> 2010K
代理商： PC34704BEP
Analog Integrated Circuit Device Data
26
Freescale Semiconductor
34704
FUNCTIONAL DESCRIPTION
FUNCTIONAL INTERNAL BLOCK DESCRIPTION
OVERALL EFFICIENCY ANALYSIS
In battery applications, it is highly recommended to power
every single regulator directly from the battery to obtain full
output capability:
Figure 4. Overall Efficiency Analysis
Efficiency analysis includes the following losses:
MOSFET Conduction Losses
MOSFET Switching Losses (Except for REG7 due to
external MOSFET and board layout dependence)
MOSFET Gate Charging Losses
MOSFET Deadtime Losses
External Diode Losses (Only for REG7)
Inductor Winding DC Losses
Inductor Core Losses (Assumed to be 20% of DC Losses
as a rule of thumb)
Output AC Losses
Li-Ion Efficiency Analysis
In this configuration, all of the regulators are supplied or
powered directly with 3.6V nominal, battery voltage.
Efficiency was calculated using the maximum allowed
frequency of 1.5MHz and 1.0MHz for FSW1 and FSW2,
respectively, in this configuration. As a result, the following
numbers are valid for worst case operation conditions.
The following table shows the detailed analysis for each
regulator with V2 at 3.3V, V3 at 1.2V, and V4 at 1.8V. This is
taken at the specified typical loads on Page15:
VBAT
V1 (5.0V)
REG1
VBAT
V2 (2.8 / 3.3V)
REG2
VBAT
V3 (1.2V / 1.5V / 1.8V)
REG3
VBAT
V4 (1.8V / 2.5V)
REG4
VBAT
V5 (3.3V)
REG5
VBAT
V6 (15V)
REG6
VBAT
V7 (-7.0V)
REG7
VBAT
V8 (15V)
REG8
REG1
REG2
REG3
REG4
REG5
REG6
REG7
REG8
Vin (V)
3.60
Vout (V)
5.00
3.30
1.20
1.80
3.30
15
-7
15
Iout_typ (A)
0.100
0.200
0.150
0.100
0.150
0.050
0.015
Iout_max (A)
0.500
0.550
0.300
0.500
0.060
0.030
DCR(m
)
230
310
230
Cout (
F)
22
ESR (m
)
9.00
Fsw (kHz)
1500
1000
Lout (
H)
1.50
4.70
Iin_typ (A)
0.154
0.201
0.063
0.059
0.150
0.254
0.107
0.077
Iin_max (A)
0.540
0.502
0.209
0.178
0.501
0.304
0.128
0.154
ILout_peak (A)
0.724
0.510
0.649
0.444
0.512
0.444
0.443
0.297
ICout_RMS (A)
0.212
0.005
0.074
0.076
0.0006
0.071
0.129
0.043
Pout (W)
0.500
0.660
0.180
0.495
0.750
0.350
0.225
Ploss On Chip (W)
0.042
0.047
0.038
0.028
0.034
0.135
0.000
0.045
Ploss Total (W)
0.044
0.049
0.041
0.030
0.035
0.145
0.027
0.047
Pin (W)
0.544
0.709
0.221
0.210
0.530
0.895
0.377
0.272
n (%)
91.90%
93.12%
81.48%
85.91%
93.33%
60.00%
69.00%
64.00%
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