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參數資料
| 型號： | LTC3112IDHD#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 12 A SWITCHING REGULATOR, 825 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | 5 X 4 MM, 0.75 MM HEIGHT, LEAD FREE, PLASTIC, MO-229WJGD-2, DFN-16 |
| 文件頁數： | 4/32頁 |
| 文件大?。?/td> | 651K |
| 代理商： | LTC3112IDHD#PBF |
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LTC3112
12
3112f
OPERATION
THERMAL CONSIDERATIONS
For the LTC3112 to provide maximum output power, it
is imperative that a good thermal path be provided to
dissipate the heat generated within the package. This can
be accomplished by taking advantage of the large thermal
pad on the underside of the IC. It is recommended that
multiple vias in the printed circuit board be used to conduct
the heat away from the IC and into a copper plane with as
much area as possible.
The efciency and maximum output current capability of
the LTC3112 will be reduced if the converter is required to
continuously deliver large amounts of power or operate at
high ambient temperatures. The amount of output current
derating is dependent upon factors such as board ground
plane or heat sink area, ambient operating temperature,
and the input/output voltages of the application. A poor
thermal design can cause excessive heating, resulting in
impaired performance or reliability.
The temperature rise curves given in the Typical
Performance Characteristics section can be used as a
general guide to predict junction temperature rise from
ambient. These curves were generated by mounting the
LTC3112 to the 4-layer FR4 Demo Board printed circuit
board layout shown in Figure 3. The curves were taken
with the board at room temperature, elevated ambient
temperatures will result in greater thermal rise rates due
to increased initial RDS(ON) of the N-Channel MOSFETs.
The die temperature of the LTC3112 should be kept below
the maximum junction rating of 125°C.
In the event that the junction temperature gets too high
(approximately 130C), the current limit will be linearly
decreased from its typical value. If the junction temperature
continues to rise and exceeds approximately 155°C the
LTC3112 will be disabled. All power devices are turned
off and all switch nodes put to a high impedance state.
The soft-start circuit for the converter is reset during
thermal shutdown to provide a smooth recovery once the
overtemperature condition is eliminated. When the die
temperature drops to approximately 145°C the LTC3112
will re-start.
UNDERVOLTAGE LOCKOUTS
The LTC3112 buck-boost converter is disabled and all power
devices are turned off until the VCC supply reaches 2.35V
(typical). The soft-start circuit is reset during undervolt-
age lockout to provide a smooth restart once the input
voltage rises above the undervoltage lockout threshold.
A second UVLO circuit disables all power devices if VIN is
below 2.3V rising, 2.0V falling (typical). This can provide
a lower VIN operating range in applications where VCC is
powered from an alternate source or VOUT after start-up.
INDUCTOR DAMPING
When the LTC3112 is disabled (RUN = 0V) or sleeping
during Burst Mode operation (PWM/SYNC = 0V), active
circuits “damp” the inductor voltage through a 250Ω
(typical) impedance from SW1 and SW2 to GND to minimize
ringing and reduce EMI.
PWM MODE OPERATION
When the PWM/SYNC pin is held high, the LTC3112 buck-
boost converter operates in a xed frequency pulse width
modulation (PWM) mode using voltage mode control. Full
output current capability is only available in PWM mode.
A proprietary switching algorithm allows the converter to
transition between buck, buck-boost, and boost modes
withoutdiscontinuityininductorcurrent.Theswitchtopology
for the buck-boost converter is shown in Figure 1.
VIN
VOUT
A
L
B
D
C
3112 F01
Figure 1. Buck-Boost Switch Topology
When the input voltage is signicantly greater than the
output voltage, the buck-boost converter operates in buck
mode. Switch D turns on at maximum duty cycle and switch
C turns on just long enough to refresh the voltage on the
BST2 capacitor used to drive switch D. Switches A and B
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| LTC3112EDHD#PBF | 12 A SWITCHING REGULATOR, 825 kHz SWITCHING FREQ-MAX, PDSO16 |
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相關代理商/技術參數 |
參數描述 |
|---|---|
| LTC3112IFE#PBF | 功能描述:IC REG BUCK BST SYNC ADJ 20TSSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關穩(wěn)壓器 系列:- 設計資源:Design Support Tool 標準包裝:1 系列:- 類型:升壓（升壓） 輸出類型:固定 輸出數:1 輸出電壓:3V 輸入電壓:0.75 V ~ 2 V PWM 型:- 頻率 - 開關:- 電流 - 輸出:100mA 同步整流器:是 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-5 細型，TSOT-23-5 包裝:剪切帶 (CT) 供應商設備封裝:TSOT-23-5 其它名稱:AS1323-BTTT-30CT |
| LTC3112IFE#TRPBF | 功能描述:IC REG BUCK BST SYNC ADJ 20TSSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關穩(wěn)壓器 系列:- 設計資源:Design Support Tool 標準包裝:1 系列:- 類型:升壓（升壓） 輸出類型:固定 輸出數:1 輸出電壓:3V 輸入電壓:0.75 V ~ 2 V PWM 型:- 頻率 - 開關:- 電流 - 輸出:100mA 同步整流器:是 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-5 細型，TSOT-23-5 包裝:剪切帶 (CT) 供應商設備封裝:TSOT-23-5 其它名稱:AS1323-BTTT-30CT |
| LTC3113 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:40V, 2A Synchronous Buck-Boost DC/DC |
| LTC3113EDHD#PBF | 功能描述:IC REG BUCK BOOST ADJ 3A 16DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關穩(wěn)壓器 系列:- 設計資源:Design Support Tool 標準包裝:1 系列:- 類型:升壓（升壓） 輸出類型:固定 輸出數:1 輸出電壓:3V 輸入電壓:0.75 V ~ 2 V PWM 型:- 頻率 - 開關:- 電流 - 輸出:100mA 同步整流器:是 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-5 細型，TSOT-23-5 包裝:剪切帶 (CT) 供應商設備封裝:TSOT-23-5 其它名稱:AS1323-BTTT-30CT |
| LTC3113EDHD#TRPBF | 功能描述:IC REG BUCK BOOST ADJ 3A 16DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關穩(wěn)壓器 系列:- 設計資源:Design Support Tool 標準包裝:1 系列:- 類型:升壓（升壓） 輸出類型:固定 輸出數:1 輸出電壓:3V 輸入電壓:0.75 V ~ 2 V PWM 型:- 頻率 - 開關:- 電流 - 輸出:100mA 同步整流器:是 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-5 細型，TSOT-23-5 包裝:剪切帶 (CT) 供應商設備封裝:TSOT-23-5 其它名稱:AS1323-BTTT-30CT |
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