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參數(shù)資料
| 型號： | LTC3531ES6-3.3#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 0.46 A SWITCHING REGULATOR, PDSO6 |
| 封裝： | LEAD FREE, PLASTIC, MO-193, TSOT-23, 6 PIN |
| 文件頁數(shù)： | 2/16頁 |
| 文件大?。?/td> | 705K |
| 代理商： | LTC3531ES6-3.3#PBF |
LTC3531/
LTC3531-3.3/LTC3531-3
10
3531fb
Buck Mode
If VIN is ~800mV above VOUT, the LTC3531 operates in
buck or step-down mode. The higher offset between VIN
and VOUT (800mV) is required to ensure sufcient mag-
netizing voltage across the inductor when the RDSONS
are taken into account. At the beginning of a buck mode
cycle (Figure 1 right side) switches A and D are turned
on (VIN – VOUT is applied across the inductor), current
is delivered to the output and ramped up until IPEAK is
detected. When this occurs, A is turned off, B is turned
on and inductor current falls (–VOUT across the induc-
tor) until an IVALLEY is detected. This AD then BD switch
sequence is repeated until the output is pumped above
its regulation voltage, a nal IZERO is detected, and the
part returns to sleep mode.
Start-Up Mode
Before VOUT reaches approximately 1.6V, the D switch is
disabled and its body diode is used to transfer current to
the output capacitor. In start-up mode, the IVALLEY/IZERO
sense circuit is disabled and an alternate algorithm is used
to control inductor current. When the LTC3531 is brought
out of shutdown (assuming VOUT is discharged) switches
A and C are turned on until the inductor current reaches
IPEAK. The AC switches are then turned off and inductor
current ows to the output through the B switch and D
body diode. The period for the B switch/D body diode is
controlled by the tOFF timer to ~800nS. This sequence of
AC switch-on to IPEAK then B switch and D body diode for
~800ns is repeated until VOUT reaches ~1.6V. Once this
OPERATIO
U
threshold is reached, the LTC3531 will transfer through the
required modes until VOUT is brought into regulation.
Due to propagation delays in the sense circuitry, the
magnitudes of the IPEAK, IVALLEY, and IZERO currents may
shift depending on VIN, VOUT and operating mode.
OTHER LTC3531 FEATURES
Shutdown: The part is shut down by pulling SHDN below
0.4V, and made active by pulling the pin up to VIN or VOUT.
Note that SHDN an be driven above VIN or VOUT, as long
as it is limited to less than 6V.
Output Disconnect and Inrush Limiting: The LTC3531
is designed to allow true output disconnect by opening
both P-channel MOSFET rectiers. This allows VOUT to go
to zero volts during shutdown, drawing no current from
the input source. It also provides inrush current limiting
at turn-on, minimizing surge currents seen by the input
supply.
Thermal Shutdown: If the die temperature reaches ap-
proximately 150°C, the part will go into thermal shut-
down and all switches will be turned off. The part will be
enabled again when the die temperature has dropped by
10°C (nominal). To deliver the power that the LTC3531
is capable of, it is imperative that a good thermal path be
provided to dissipate the heat generated within the pack-
age. It is recommended that multiple vias in the printed
circuit board be used to conduct heat away from the IC
and into a copper plane with as much area as possible.
Soldering the Exposed Pad to the GND plane (DFN version)
is recommended to improve thermal performance.
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| LTC3532 | 制造商:LINEAR 制造商全稱:LINEAR 功能描述:High Effi ciency, Synchronous, 4-Switch Buck-Boost Controller |
| LTC3532EDD | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Micropower Synchronous Buck-Boost DC/DC Converter |
| LTC3532EDD#PBF | 功能描述:IC REG BUCK BOOST SYNC ADJ 10DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:250 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:1.2V 輸入電壓:2.05 V ~ 6 V PWM 型:電壓模式 頻率 - 開關(guān):2MHz 電流 - 輸出:500mA 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:6-UFDFN 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:6-SON（1.45x1） 產(chǎn)品目錄頁面:1032 (CN2011-ZH PDF) 其它名稱:296-25628-2 |
| LTC3532EDD#TRPBF | 功能描述:IC REG BUCK BOOST SYNC ADJ 10DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:升壓（升壓） 輸出類型:可調(diào)式 輸出數(shù):1 輸出電壓:1.24 V ~ 30 V 輸入電壓:1.5 V ~ 12 V PWM 型:電流模式，混合 頻率 - 開關(guān):600kHz 電流 - 輸出:500mA 同步整流器:無 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:8-SOIC |
| LTC3532EDD-PBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Micropower Synchronous Buck-Boost DC/DC Converter |
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