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參數(shù)資料
| 型號： | AS1331-BTDT-AD |
| 廠商： | AUSTRIAMICROSYSTEMS AG |
| 元件分類： | DC/DC變換器 |
| 英文描述： | 300mA Buck-Boost Converter; Package Type: TDFN(3x3)-10; Output Range: 2.5 to 3.3V |
| 封裝： | TDFN(3x3)-10 |
| 文件頁數(shù)： | 10/16頁 |
| 文件大?。?/td> | 2337K |
| 代理商： | AS1331-BTDT-AD |
10 - 16
AS1331
Datasheet - Detailed Description
8 Detailed Description
The synchronous buck-boost converter AS1331 uses a Power Save Mode control technique to reach a high efficiency
over a wide dynamic range of load currents. The output voltage is monitored by a comparator with 3% accuracy. The
Power Save Mode puts the device into “sleep mode” when V
OUT
is above its programmed reference threshold.
Meaning, the switching is stopped and only quiescent current is drawn from the power source. The switching is started
again when V
OUT
drops below the reference threshold and the output capacitor is charged again.
The numbers of current pulses which are necessary to load the output capacitor are set by the value of the output
capacitor, the load current, and the comparator hysteresis (~1%).
Figure 23. AS1331 - Block Diagram - Fixed Output Voltage
Modes of Operation
When V
OUT
drops below the reference threshold, the AS1331 switches on the transistors SW A and SW C until the
inductor current reaches approximately 400mA. In the next step SW A and SW D are closed and depending on the
difference between V
IN
and V
OUT
the inductor current raises, falls or stays constant.
V
IN
> V
OUT
: The inductor current is going up to 600mA.
V
IN
~ V
OUT
: The device stops after 2μs.
V
IN
< V
OUT
: The inductor current falls down to 0mA.
If the inductor current is not 0mA, the transistors SW B and SW D are closed to ramp down the current to zero. If V
OUT
is still below the threshold voltage the next cycle is started. If I
MAX
(600mA) wasn’t reached in the previous cycle, SW A
and SW D are closed until the inductor current is 600mA.
Note:
The 4-switch-mode (SW A+SW C => SW B+SW D => SW A + SW C...) and also the buck-mode (SW A+SW D
=> SW B+SW D => SW A+SW D...) are never used.
Start-Up Mode
At start-up the switch SW D is disabled and its diode is used to transfer current to the output capacitor until V
OUT
reaches approximately 2.15V. The inductor current is controlled by an alternate algorithm during start-up.
Note:
Do not apply loads >1mA until V
OUT
= 2.3V is reached.
VIN
SW1
SW2
SW A
SW B
SW C
SW D
V
IN
V
IN
1.6V
600mA
VOUT
PGND
GND
EN
Peak
Current
Limit
UVLO
State
Machine
and
Logic
V
BEST
Gate Drivers
and
Anticross
Conduction
IZERO
Detect
1.25V
Thermal Shutdown
Shutdown
V
OUT
V
BEST
R1
R2
FB
VOUT
Comp
AS1331
相關PDF資料 |
PDF描述 |
|---|---|
| AS1331-BTDT-33 | 300mA Buck-Boost Converter; Package Type: TDFN(3x3)-10; Output Range: 3.3V |
| AS1332-BWLT | 650mA, RF Buck Converter, Vcon |
| AS1333-BWLT | 650mA, RF, Buck Converter; Package Type: CS-WLP(1.5x1.5)-8; Output Range: 3.09V |
| AS1334-BTDT-30 | 650mA LowRipple Buck Converter |
| AS1335-BTDT-100 | 1.5A Buck Converter |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| AS1331-BTDT-AD EB | 制造商:ams 功能描述:Evaluation Board |
| AS1331-BTDT-AD-1K | 功能描述:IC REG BUCK BST SYNC ADJ 10TDFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關穩(wěn)壓器 系列:- 標準包裝:50 系列:- 類型:升壓（升壓） 輸出類型:可調式 輸出數(shù):1 輸出電壓:5 V ~ 25 V 輸入電壓:2.3 V ~ 5.5 V PWM 型:電流模式 頻率 - 開關:600kHz，1.2MHz 電流 - 輸出:1A 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-TSSOP，8-MSOP（0.118"，3.00mm 寬） 包裝:管件 供應商設備封裝:8-MSOP |
| AS1331-EB | 制造商:ams 功能描述:AS1331 Evaluation Board |
| AS1331-TD-AD_EK_ST | 功能描述:AS1331 - DC/DC, Step Up or Down 1, Non-Isolated Outputs Evaluation Board 制造商:ams 系列:- 零件狀態(tài):有效 主要用途:DC/DC，步升/步降 輸出和類型:1，非隔離 功率 - 輸出:- 電壓 - 輸出:2.5 V ~ 3.3 V 電流 - 輸出:300mA 電壓 - 輸入:1.8 V ~ 5.5 V 穩(wěn)壓器拓撲:降壓-升壓 頻率 - 開關:- 板類型:完全填充 所含物品:板 使用的 IC/零件:AS1331 標準包裝:1 |
| AS1332 | 制造商:AMSCO 制造商全稱:austriamicrosystems AG 功能描述:650mA, Step-Down DC-DC Converter for RF Power Amplifiers |
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