Datasheet > AS1337B-BTDT

AS1337B-BTDT

更新时间： 2024-02-23 00:01:39

品牌	Logo	应用领域
艾迈斯 - AMSCO		转换器开关光电二极管输出元件升压转换器
页数	文件大小	规格书
14页	912K
描述
200mA, DC-DC Step-Up Converter with Buck Mode

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AS1337B-BTDT 技术参数

是否Rohs认证：	符合	生命周期：	Obsolete
零件包装代码：	SON	包装说明：	HVSON,
针数：	8	Reach Compliance Code：	unknown
ECCN代码：	EAR99	HTS代码：	8542.39.00.01
风险等级：	5.8	其他特性：	OUTPUT ADJUSTABLE MODE FROM 2.5 TO 5 VOLT; 5 VOLT OUTPUT ALSO AVAILABLE
模拟集成电路 - 其他类型：	SWITCHING REGULATOR	控制模式：	CURRENT-MODE
控制技术：	PULSE WIDTH MODULATION	最大输入电压：	4.5 V
最小输入电压：	0.65 V	标称输入电压：	1.2 V
JESD-30 代码：	S-PDSO-N8	JESD-609代码：	e3
长度：	3 mm	功能数量：	1
端子数量：	8	最高工作温度：	85 °C
最低工作温度：	-45 °C	标称输出电压：	3.3 V
封装主体材料：	PLASTIC/EPOXY	封装代码：	HVSON
封装形状：	SQUARE	封装形式：	SMALL OUTLINE, HEAT SINK/SLUG, VERY THIN PROFILE
峰值回流温度（摄氏度）：	NOT SPECIFIED	座面最大高度：	0.8 mm
表面贴装：	YES	切换器配置：	BUCK-BOOST
最大切换频率：	1500 kHz	温度等级：	INDUSTRIAL
端子面层：	Matte Tin (Sn)	端子形式：	NO LEAD
端子节距：	0.65 mm	端子位置：	DUAL
处于峰值回流温度下的最长时间：	NOT SPECIFIED	宽度：	3 mm
Base Number Matches：	1

AS1337B-BTDT 数据手册

AS1337

Datasheet - Detailed Description

Low-Voltage Start-Up and Soft Start

The AS1337 requires a VIN of only 0.85V (typ) or higher to start up. The low-voltage start-up circuitry controls the inter-

nal switches and provides a soft start function, where the inductor current during start up is limited to about 300mA.

This soft start and in rush current limitation feature provides also a smooth curve of VOUT after start up and makes the

overshoot of VOUT minimal.

After a certain time a bigger inductor current is allowed and the soft start is disabled.

Low-Noise Fixed-Frequency Operation

Oscillator

The AS1337 switching frequency is internally fixed at 1.2MHz allowing the use of very small external components.

Current Sensing

A signal representing the internal NMOS-switch current is summed with the slope compensator. The summed signal is

compared to the error amplifier output to provide a peak current control command for the PWM. Peak switch current is

limited to approximately 850mA independent of VIN or VOUT.

Zero Current Comparator

The zero current comparator monitors the inductor current to the output and shuts off the PMOS synchronous rectifier

once this current drops to 20mA (approx.). This prevents the inductor current from reversing polarity and results in

improved converter efficiency at light loads.

Anti-Ringing Control

Anti-ringing control circuitry prevents high-frequency ringing on pin LX as the inductor current approaches zero. This is

accomplished by damping the resonant circuit formed by the inductor and the capacitance on pin LX.

Setting Output Voltage

A voltage divider from VOUT to GND programs the output voltage from 2.5V to 5V via pin FB as:

VOUT = 1.23V(1 + (R1/R2))

(EQ 1)

Powersave Operation

In light load conditions, the integrated powersave feature removes power from all circuitry not required to monitor

VOUT. When VOUT has dropped approximately 1% from nominal, the AS1337 powers up and begins normal PWM

operation.

COUT (see Figure 13 on page 7) recharges, causing the AS1337 to re-enter powersave mode as long as the output

load remains below the powersave threshold. The frequency of this intermittent PWM is proportional to load current;

i.e., as the load current drops further below the powersave threshold, the AS1337 turns on less frequently. When the

load current increases above the powersave threshold, the AS1337 will resume continuous, seamless PWM operation.

Note: An optional capacitor (CFF) between pins VOUT and FB in some applications can reduce VOUTp-p ripple and

input quiescent current during powersave mode. Typical values for CFF range from 15pF to 220pF.

Buck Mode

The AS1337A offers a low power buck mode for VIN > VOUT operation.

Shutdown

When pin EN is low the AS1337 is switched off and <1µA current is drawn from battery; when pin EN is high the device

is switched on. If EN is driven from a logic-level output, the logic high-level (on) should be referenced to VOUT to avoid

intermittently switching the device on.

Note: If pin EN is not used, it should be connected directly to pin VOUT.

Caution: Because of the feedthrough the output voltage is the same as the input voltage during shutdown. If VIN >

VOUT the output voltage will jump to the value of the input voltage when the device switches into shut-

down. During normal operation the device is in down conversion mode.

www.austriamicrosystems.com

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