參數(shù)資料
型號： LTC3880IUJ#PBF
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： 0.1 A DUAL SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PQCC40
封裝： 6 X 6 MM, LEAD FREE, PLASTIC, WJJD-2, QFN-40
文件頁數(shù)： 60/112頁
文件大小： 2182K
代理商： LTC3880IUJ#PBF
LTC3880/LTC3880-1
51
3880fa
APPLICATIONS INFORMATION
Table 15. ASEL
RTOP (kΩ)
RBOTTOM (kΩ)
SLAVE ADDRESS
LSB HEX
0 or Open
Open
NVM
10
23.2
xyz_1111
F
10
15.8
xyz_1110
E
16.2
20.5
xyz_1101
D
16.2
17.4
xyz_1100
C
20
17.8
xyz_1011
B
20
15
xyz_1010
A
20
12.7
xyz_1001
9
20
11
xyz_1000
8
24.9
11.3
xyz_0111
7
24.9
9.09
xyz_0110
6
24.9
7.32
xyz_0101
5
24.9
5.76
xyz_0100
4
24.9
4.32
xyz_0011
3
30.1
3.57
xyz_0010
2
30.1
1.96
xyz_0001
1
Open
0
xyz_0000
0
EFFICIENCY CONSIDERATIONS
The percent efficiency of a switching regulator is equal to
the output power divided by the input power times 100%.
It is often useful to analyze individual losses to determine
what is limiting the efficiency and which change would
produce the most improvement. Percent efficiency can
be expressed as:
%Efficiency = 100% – (L1 + L2 + L3 + ...)
where L1, L2, etc. are the individual losses as a percent-
age of input power.
Although all dissipative elements in the circuit produce
losses, four main sources usually account for most of the
losses in LTC3880 circuits: 1) IC VIN current, 2) INTVCC
regulator current, 3) I2R losses, 4) Topside MOSFET
transition losses.
1. The VIN current is the DC supply current given in
the Electrical Characteristics table, which excludes
MOSFET driver and control currents. VIN current typi-
cally results in a small (<0.1%) loss.
2. INTVCC current is the sum of the MOSFET driver and
control currents. The MOSFET driver current results
from switching the gate capacitance of the power
MOSFETs. Each time a MOSFET gate is switched from
low to high to low again, a packet of charge dQ moves
from INTVCC to ground. The resulting dQ/dt is a cur-
rent out of INTVCC that is typically much larger than the
control circuit current. In continuous mode, IGATECHG
= f(QT + QB), where QT and QB are the gate charges of
the topside and bottom side MOSFETs.
On the LTC3880-1, supplying EXTVCC from an output-
derived source will scale the VIN current required for
the driver and control circuits by a factor of:
VEXTVCC
VIN
1
Efficiency
Forexample,ina20Vto5Vapplication,10mAofINTVCC
current results in approximately 2.5mA of VIN current.
This reduces the mid-current loss from 10% or more
(if the driver was powered directly from VIN) to only a
few percent.
Table 15A1. LTC3880 MFR_ADDRESS Command Examples
Expressing Both 7- or 8-Bit Addressing
DESCRIPTION
HEX DEVICE
ADDRESS BIT
7
BIT
6
BIT
5
BIT
4
BIT
3
BIT
2
BIT
1
BIT
0 R/W
7 BIT 8 BIT
Rail4
0x5A 0xB4 0
1
0
1
0
1
0
Global4
0x5B 0xB6 0
1
0
1
0
1
0
Default
0x4F 0x9E 0
1
0
1
0
Example 1
0x60 0xC0 0
1
0
Example 2
0x61 0xC2 0
1
0
1
0
Disabled2,3,5
1
0
Note 1: This table can be applied to the MFR_CHANNEL_ADDRESS,
and MFR_RAIL_ADDRESS commands as well as the MFR_ADDRESS
command.
Note 2: A disabled value in one command does not disable the device, nor
does it disable the Global address.
Note 3: A disabled value in one command does not inhibit the device from
responding to device addresses specified in other commands.
Note 4: It is not recommended to write the value 0x00, 0x0C (7 bit),
or 0x5A or 0x5B(7 bit) to the MFR_ADDRESS, MFR_CHANNEL_
ADDRESS or the MFR_RAIL_ADDRESS commands.
Note 5: To disable the address enter 0x80 in the MFR_ADDRESS
command. The 0x80 is greater than the 7-bit address field, disabling
the address.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LTC3883EUH#PBF 制造商:Linear Technology 功能描述:IC REG CTRLR BUCK PWM VM 32-QFN 制造商:Linear Technology 功能描述:BUCK CNTRL 24V 1MHZ 0.5/5.5V 32QFN 制造商:Linear Technology 功能描述:BUCK, CNTRL, 24V, 1MHZ, 0.5/5.5V, 32QFN 制造商:Linear Technology 功能描述:PWM CONTROLLER, BUCK, 1MHZ, 24V, QFN-32, Input Voltage:24V, Output Voltage:5.5V, Output Current:30A, Supply Voltage Min:4.5V, Supply Voltage Max:24V, Digital IC Case Style:QFN, No. of Pins:32, Frequency:1MHz, MSL:MSL 1 - Unlimited , RoHS Compliant: Yes 制造商:Linear Technology 功能描述:DP-SWREG/Controller, Digitally Programmable, Multiphase Step-Down DC/DC Controll
LTC3883EUH#TRPBF 制造商:Linear Technology 功能描述:IC REG CTRLR BUCK PWM VM 32-QFN 制造商:Linear Technology 功能描述:DP-SWREG/Controller, Digitally Programmable, Multiphase Step-Down DC/DC Controll
LTC3883EUH-1#PBF 制造商:Linear Technology 功能描述:IC REG CTRLR BUCK PWM VM 32-QFN 制造商:Linear Technology 功能描述:BUCK CNTRL 24V 1MHZ 0.5/5.5V 32QFN 制造商:Linear Technology 功能描述:BUCK, CNTRL, 24V, 1MHZ, 0.5/5.5V, 32QFN 制造商:Linear Technology 功能描述:PWM CONTROLLER, BUCK, 1MHZ, 24V, QFN-32, Input Voltage:24V, Output Voltage:5.5V, Output Current:30A, Supply Voltage Min:4.5V, Supply Voltage Max:24V, Digital IC Case Style:QFN, No. of Pins:32, Frequency:1MHz, MSL:MSL 1 - Unlimited , RoHS Compliant: Yes 制造商:Linear Technology 功能描述:DP-SWREG/Controller, Digitally Programmable, Multiphase Step-Down DC/DC Controll
LTC3883EUH-1#TRPBF 制造商:Linear Technology 功能描述:IC REG CTRLR BUCK PWM VM 32-QFN
LTC3883IUH#PBF 制造商:Linear Technology 功能描述:DC DC Cntrlr Single-OUT Sync Step Down 4.5V to 24V Input 32-Pin QFN EP 制造商:Linear Technology 功能描述:IC REG CTRLR BUCK PWM VM 32-QFN 制造商:Linear Technology 功能描述:BUCK CNTRL 24V 1MHZ 0.5/5.5V 32QFN 制造商:Linear Technology 功能描述:BUCK, CNTRL, 24V, 1MHZ, 0.5/5.5V, 32QFN 制造商:Linear Technology 功能描述:PWM CONTROLLER, BUCK, 1MHZ, 24V, QFN-32, Input Voltage:24V, Output Voltage:5.5V, Output Current:30A, Supply Voltage Min:4.5V, Supply Voltage Max:24V, Digital IC Case Style:QFN, No. of Pins:32, Frequency:1MHz, MSL:MSL 1 - Unlimited , RoHS Compliant: Yes 制造商:Linear Technology 功能描述:DP-SWREG/Controller, Digitally Programmable, Multiphase Step-Down DC/DC Controll
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