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| 型号： | AS1331-BTDT |
| 厂商： | ams |
| 文件页数： | 11/17页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK BST SYNC ADJ 10TDFN |
| 标准包装： | 6,000 |
| 类型： | 降压（降压），升压（升压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 2.5 V ~ 3.3 V |
| 输入电压： | 1.8 V ~ 5.5 V |
| 电流 - 输出： | 300mA |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-WFDFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 10-TDFN（3x3） |
AS1331
Datasheet - D e t a i l e d D e s c r i p t i o n
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
SW1
SW2
VIN
SW A
SW D
VOUT
Gate Drivers
SW B
AS1331
and
Anticross
Conduction
SW C
IZERO
Detect
Peak
Current
600mA Limit
State
V BEST
V BEST
V IN
V IN
Machine
and
Logic
V OUT
FB
EN
1.6V
UVLO
Shutdown
Thermal Shutdown
VOUT
Comp
1.25V
R1
R2
PGND
GND
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.
Revision 1.04
10 - 16
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AS1331-BTDT-25 | 制造商:ams 功能描述:T&R / TDFN 3x3 10 |
| AS1331-BTDT-25-1K | 功能描述:IC REG BUCK BST SYNC 2.5V 10TDFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:50 系列:- 类型:升压（升压） 输出类型:可调式 输出数:1 输出电压:5 V ~ 25 V 输入电压:2.3 V ~ 5.5 V PWM 型:电流模式 频率 - 开关:600kHz，1.2MHz 电流 - 输出:1A 同步整流器:无 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-TSSOP，8-MSOP（0.118"，3.00mm 宽） 包装:管件 供应商设备封装:8-MSOP |
| AS1331-BTDT-30 | 制造商:ams 功能描述:IC REG BUCK BOOST SYNC 3V 10TDFN 制造商:ams 功能描述:T&R / TDFN 3x3 10 |
| AS1331-BTDT-30-1K | 功能描述:IC REG BUCK BOOST SYNC 3V 10TDFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:50 系列:- 类型:升压（升压） 输出类型:可调式 输出数:1 输出电压:5 V ~ 25 V 输入电压:2.3 V ~ 5.5 V PWM 型:电流模式 频率 - 开关:600kHz，1.2MHz 电流 - 输出:1A 同步整流器:无 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-TSSOP，8-MSOP（0.118"，3.00mm 宽） 包装:管件 供应商设备封装:8-MSOP |
| AS1331-BTDT-33 | 制造商:ams 功能描述:IC REG BUCK BST SYNC 3.3V 10TDFN 制造商:ams 功能描述:T&R / TDFN 3x3 10 |
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