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| 型号： | AS1337B-BTDT |
| 厂商： | ams |
| 文件页数： | 2/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK BOOST SYNC ADJ 8TDFN |
| 标准包装： | 1 |
| 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 ~ 5 V |
| 输入电压： | 0.65 V ~ 4.5 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 1.2MHz |
| 电流 - 输出： | 200mA |
| 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： | 8-WDFN 裸露焊盘 |
| 包装： | 标准包装 |
| 供应商设备封装： | 8-TDFN（3x3） |
| 其它名称： | AS1337B-BTDTDKR |
Data sheet
AS1337
2 0 0 m A , D C - D C St e p - U p C o n v e r t e r w i t h B u c k M o d e
1 General Description
The AS1337 is a synchronous, fixed frequency, highefficiency
DC-DC boost converter capable of supplying 3.3V @ 200mA
from two AA Cells. Compact size and minimum external parts
requirements make these devices perfect for modern portable
devices. The AS1337 offers automatic powersave mode to
increase efficiency at light loads. For input voltages higher
than VOUT the AS1337 will switch in a step down mode, so
that a Buck Boost function is realized.
The AS1337A offers a shutdown mode where the battery is
connected directly to the output enabling the supply of real-
time-clocks or memories.
In the shutdown mode of the AS1337B the battery is discon-
nected and the output is discharged.
Table 1. Standard Products
2 Key Features
Input Voltage Range: 0.65V to 4.5V
Low Start-Up Voltage: 0.85V
Output Voltage Range: 2.5V to 5.0V
Delivers 200mA @ 3.3V (from two AA Cell)
up to 97% Efficiency
High-Speed Fixed-Frequency: 1.2MHz
Single-Cell Operation
Internal PMOS Synchronous Rectifier
Automatic Powersave Operation
Anti-Ringing Control Minimizes EMI
Logic Controlled Shutdown (< 1μA)
Model
AS1337A
Operation Mode
Battery Connected in Shutdown
TDFN (3x3mm) 8-pin Package
AS1337B
Battery Disconnected in Shutdown and
Output Discharged
The AS1337 offers a POK (open-drain) feature which detects
output power fail of 10%.
The AS1337 is available in a TDFN (3x3mm) 8-pin package .
3 Applications
The AS1337 is ideal for low-power applications where ultra-
small size is critical as in medical diagnostic equipment, hand-
held instruments, pagers, digital cameras, remote wireless
transmitters, MP3 players, LCD bias supplies, cordless
phones, GPS receivers, and PC cards.
Figure 1. AS1337 - Typical Application Diagram – Dual Cell to 3.3V Synchronous Boost Converter
3.6V
L1
4.7μH
V OUT = 3.3V
Buck Mode
V OUT =3.3V
V IN Curve
Boost Mode
V IN = 2xAA
1.6V to 3.6V
C IN
10μF
On
Off
LX
VIN
EN
AS1337
VOUT
FB
POK
C OUT
22μF
1.6V
GND
PGND
Revision 1.05
1 - 15
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