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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)： | 67/112頁 |
| 文件大?。?/td> | 2182K |
| 代理商： | LTC3880IUJ#PBF |
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LTC3880/LTC3880-1
58
3880fa
The loss in the bottom side MOSFET is:
PSYNC =
20V – 3.3V
(
)
20V
17.39A
(
)2
1
+ 0.005
(
) 50°C–25°C
(
)
0.003
= 0.852W
Both MOSFETS have I2R losses while the PMAIN equation
includes an additional term for transition losses, which
are highest at high input voltages.
CIN is chosen for an RMS current rating of:
CIN Required IRMS =
17.39
20
3.3
( ) 20–3.3
(
)
1/2
= 6.5A
at temperature assuming only channel 0 or 1 is on. COUT
is chosen with an ESR of 0.006Ω for low output ripple.
The output ripple in continuous mode will be highest at
the maximum input voltage. The output voltage ripple
due to ESR is
VORIPPLE = R(IL) = 0.006Ω 5.5A = 33mV.
APPLICATIONS INFORMATION
VIN
VDD33
VDD25
SDA
1F
VGS MAX ON THE TP0101K IS 8V IF VIN > 16V
CHANGE THE RESISTOR DIVIDER ON THE PFET GATE
1F
3880 F28
10k
100k
TP0101K
ISOLATED 3.3V
SDA
SCL
TP0101K
100k
LTC
CONTROLLER
HEADER
TO LTC DC1613
USB TO I2C/SMBus/PMBus
CONTROLLER
SCL
WP SGND
LTC3880
VIN
VDD33
SDA
SCL
WP SGND
LTC3880
10k
VDD25
Figure 28. LTC Controller Connection
CONNECTING THE USB TO THE I2C/SMBus/PMBus
CONTROLLER TO THE LTC3880 IN SYSTEM
The LTC USB to I2C/SMBus/PMBus controller can be
interfacedtotheLTC3880ontheuser’sboardforprogram-
ming, telemetry and system debug. The controller, when
usedinconjunctionwithLTpowerPlay,providesapowerful
way to debug an entire power system. Faults are quickly
diagnosed using telemetry, fault status registers and the
fault log. The final configuration can be quickly developed
and stored to the LTC3880 EEPROM.
Figure 28 illustrates the application schematic for pow-
ering, programming and communication with one or
more LTC3880s via the LTC I2C/SMBus/PMBus controller
regardless of whether or not system power is present. If
system power is not present the dongle will power the
LTC3880 through the VDD33 supply pin. To initialize the
part when VIN is not applied and the VDD33 pin is pow-
ered use global address 5B command 0xBD data 0x2B
followed by address 5B command 0xBD data 0xC4. The
part can now be communicated with, and the project file
updated. To write the updated project file to the NVM issue
a STORE_USER_ALL command. When VIN is applied,
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| 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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