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參數(shù)資料
| 型號(hào)： | LTC3526LEDC |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, 1250 kHz SWITCHING FREQ-MAX, PDSO6 |
| 封裝： | 2 X 2 MM, 0.75 MM HEIGHT, PLASTIC, MO-229WCCD-2, DFN-6 |
| 文件頁(yè)數(shù)： | 16/16頁(yè) |
| 文件大?。?/td> | 342K |
| 代理商： | LTC3526LEDC |
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LTC3526L
9
3526lf
Zero Current Comparator
The zero current comparator monitors the inductor cur-
rent to the output and shuts off the synchronous rectier
when this current reduces to approximately 30mA. This
prevents the inductor current from reversing in polarity,
improving efciency at light loads.
Synchronous Rectier
To control inrush current and to prevent the inductor
current from running away when VOUT is close to VIN, the
P-channel MOSFET synchronous rectier is only enabled
when VOUT > (VIN + 0.24V).
Anti-Ringing Control
The anti-ring circuit connects a resistor across the in-
ductor to prevent high frequency ringing on the SW pin
during discontinuous current mode operation. Although
the ringing of the resonant circuit formed by L and CSW
(capacitance on SW pin) is low energy, it can cause EMI
radiation.
Output Disconnect
The LTC3526L is designed to allow true output discon-
nect by eliminating body diode conduction of the internal
P-channel MOSFET rectier. This allows for VOUT to go
to zero volts during shutdown, drawing no current from
the input source. It also allows for inrush current limiting
at turn-on, minimizing surge currents seen by the input
supply. Note that to obtain the advantages of output dis-
connect, there must not be an external Schottky diode
connected between SW and VOUT. The output disconnect
feature also allows VOUT to be pulled high, without any
reverse current into a battery connected to VIN.
Thermal Shutdown
If the die temperature exceeds 160°C, the LTC3526L will
go into thermal shutdown. All switches will be off and
the soft-start capacitor will be discharged. The device
will be enabled again when the die temperature drops by
about 15°C.
Burst Mode OPERATION
The LTC3526L will enter Burst Mode operation at light load
current and return to xed frequency PWM mode when the
load increases. Refer to the Typical Performance Character-
istics to see the output load Burst Mode threshold current
vs VIN. The load current at which Burst Mode operation is
entered can be changed by adjusting the inductor value.
Raising the inductor value will lower the load current at
which Burst Mode operation is entered.
In Burst Mode operation, the LTC3526L still switches at a
xed frequency of 1MHz, using the same error amplier
and loop compensation for peak current mode control.
This control method eliminates any output transient
when switching between modes. In Burst Mode opera-
tion, energy is delivered to the output until it reaches the
nominal regulation value, then the LTC3526L transitions
to sleep mode where the outputs are off and the LTC3526L
consumes only 9A of quiescent current from VOUT. When
the output voltage droops slightly, switching resumes.
This maximizes efciency at very light loads by minimizing
switching and quiescent losses. Burst Mode output voltage
ripple, which is typically 1% peak-to-peak, can be reduced
by using more output capacitance (10F or greater), or
with a small capacitor (10pF to 50pF) connected between
VOUT and FB.
As the load current increases, the LTC3526L will auto-
matically leave Burst Mode operation. Note that larger
output capacitor values may cause this transition to
occur at lighter loads. Once the LTC3526L has left Burst
Mode operation and returned to normal operation, it will
remain there until the output load is reduced below the
burst threshold current.
Burst Mode operation is inhibited during start-up and soft-
start and until VOUT is at least 0.24V greater than VIN.
OPERATIO
U
(Refer to Block Diagram)
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC3526LEDC#PBF | 制造商:Linear Technology 功能描述:BOOST SYNCH 0.5A 1MHZ 6DFN 制造商:Linear Technology 功能描述:BOOST, SYNCH, 0.5A, 1MHZ, 6DFN |
| LTC3526LEDC#TRMPBF | 功能描述:IC REG BOOST SYNC ADJ 0.55A 6DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開(kāi)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(kāi)關(guān):600kHz 電流 - 輸出:500mA 同步整流器:無(wú) 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 |
| LTC3526LEDC#TRPBF | 功能描述:IC REG BOOST SYNC ADJ 0.55A 6DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開(kāi)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(kāi)關(guān):600kHz 電流 - 輸出:500mA 同步整流器:無(wú) 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 |
| LTC3526LEDC-PBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:550mA 1MHz Synchronous Step-Up DC/DC Converters in 2mm × 2mm DFN |
| LTC3526LEDC-TRPBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:550mA 1MHz Synchronous Step-Up DC/DC Converters in 2mm × 2mm DFN |
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