- 您現(xiàn)在的位置：買賣IC網 > PDF目錄30771 > LTC3816IFE#TRPBF (LINEAR TECHNOLOGY CORP) SWITCHING CONTROLLER, PDSO38 PDF資料下載
參數(shù)資料
| 型號： | LTC3816IFE#TRPBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, PDSO38 |
| 封裝： | LEAD FREE, PLASTIC, TSSOP-38 |
| 文件頁數(shù)： | 21/44頁 |
| 文件大?。?/td> | 753K |
| 代理商： | LTC3816IFE#TRPBF |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁當前第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁
LTC3816
3816f
applicaTions inForMaTion
Figure 15. Programmable VID Slew Rate
VOUT
100mV/DIV
VID5
1V/DIV
DPRSLPVR
5V/DIV
VIN = 12V
VOUT = 0.75V TO 1.15V
CSLEW = 47pF
IMVP-6 CONFIGURATION
0.1ms/DIV
3816 F15
thecontrollerreducestheICSLEWpull-upcurrentfrom40A
to 10A (deeper sleep mode). This effectively reduces the
VID DAC slew rate to 1/4 of its original value. If IMVP-6.5
is selected, the slow slew rate function is disabled.
PULSE-SKIPPING AND FORCED CONTINUOUS MODE
OPERATION
The LTC3816 can operate in one of two modes select-
able with the MODE/SYNC pin: pulse-skipping mode
or forced continuous mode. Shorting the MODE/SYNC
pin to INTVCC selects pulse-skipping mode. Pulse-skip-
ping mode is selected when high efficiency at very light
loads is desired. In this mode, when the inductor current
reverses, the bottom MOSFET turns off to minimize the
efficiency loss due to reverse current flow. This reduces
the conduction loss and slightly improves the efficiency.
As the load reduces, the top gate duty cycle shrinks to
maintain regulation. The LTC3816 is capable of operating
at extremely low duty cycles; hence, TG will continue to
run at a constant switching frequency until the top gate
on-timeislessthan40nsto50ns.Whentheloaddecreases
beyond this point, the LTC3816 TG begins to skip cycles
to maintain regulation. The driver switching frequency
drops, which further improves efficiency by minimizing
gate charge losses.
ForcingtheMODE/SYNCpinlowenablesforcedcontinuous
mode operation. In forced continuous mode, the bottom
MOSFETisalwaysonwhenthetopMOSFETisoff,allowing
the inductor current to reverse at low currents. This mode
is less efficient due to conduction and switching losses,
but has the advantage of better transient response at low
currents, constant frequency operation, and the ability to
maintain regulation when sinking current.
During soft-start, the LTC3816 forces the controller to
operate in pulse-skipping mode until the switcher output
voltage reaches its VBOOT power good threshold. During
VID code transitions, however, the controller always oper-
ates in forced continuous mode to allow the switcher to
sink current.
OPERATING FREQUENCY/FREQUENCY
SYNCHRONIzATION
Theselectionofswitchingfrequencyisatrade-offbetween
efficiency and component size. Low frequency operation
increasesefficiencybyreducingMOSFETswitchinglosses,
but requires a larger inductance and/or capacitance to
maintain low output voltage ripple. For converters with
high step-down VIN-to-VOUT ratios, another consideration
is the minimum on-time of the converter.
t
V
f
ON MIN
OUT
IN MAX
OSC
(
)
(
)
=
If the MODE/SYNC pin is not driven by an external clock,
the RFREQ pin voltage configures the LTC3816 free-run-
ning switching frequency. Floating or shorting the RFREQ
pin to INTVCC allows the controller to run at the nominal
400kHz frequency. Connecting the RFREQ pin to GND
selects 210kHz. Tying RFREQ to a potential between 2.5V
and 3.5V selects 580kHz. The RFREQ pin has an internal
相關PDF資料 |
PDF描述 |
|---|---|
| LTC3816EFE#PBF | SWITCHING CONTROLLER, PDSO38 |
| LTC3816EFE#TRPBF | SWITCHING CONTROLLER, PDSO38 |
| LTC3823IGN#TRPBF | 4 A SWITCHING CONTROLLER, PDSO28 |
| LTC3851AEMSE-1#PBF | 0.05 A SWITCHING CONTROLLER, 810 kHz SWITCHING FREQ-MAX, PDSO16 |
| LTC3851AIUD-1#TRPBF | 0.05 A SWITCHING CONTROLLER, 810 kHz SWITCHING FREQ-MAX, PQCC16 |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LTC3816IUHF#PBF | 功能描述:IC CONTROLLER S-PHASE 32QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 標準包裝:43 系列:- 應用:控制器，Intel VR11 輸入電壓:5 V ~ 12 V 輸出數(shù):1 輸出電壓:0.5 V ~ 1.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-VFQFN 裸露焊盤 供應商設備封裝:48-QFN（7x7） 包裝:管件 |
| LTC3816IUHF#TRPBF | 功能描述:IC CONTROLLER S-PHASE 32QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 標準包裝:43 系列:- 應用:控制器，Intel VR11 輸入電壓:5 V ~ 12 V 輸出數(shù):1 輸出電壓:0.5 V ~ 1.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-VFQFN 裸露焊盤 供應商設備封裝:48-QFN（7x7） 包裝:管件 |
| LTC3819EG#PBF | 功能描述:IC CNTRLR STEP DOWN 36-SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 標準包裝:43 系列:- 應用:控制器，Intel VR11 輸入電壓:5 V ~ 12 V 輸出數(shù):1 輸出電壓:0.5 V ~ 1.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-VFQFN 裸露焊盤 供應商設備封裝:48-QFN（7x7） 包裝:管件 |
| LTC3819EG#TRPBF | 功能描述:IC CNTRLR STEP DOWN 36-SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 標準包裝:43 系列:- 應用:控制器，Intel VR11 輸入電壓:5 V ~ 12 V 輸出數(shù):1 輸出電壓:0.5 V ~ 1.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-VFQFN 裸露焊盤 供應商設備封裝:48-QFN（7x7） 包裝:管件 |
| LTC3822EDD#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 10-DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標準包裝:2,000 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:1MHz 占空比:50% 電源電壓:9 V ~ 10 V 降壓:無 升壓:是 回掃:是 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 85°C 封裝/外殼:8-TSSOP（0.173"，4.40mm 寬） 包裝:帶卷 (TR) |
發(fā)布緊急采購，3分鐘左右您將得到回復。