参数资料
型号: AS1337B-BTDT
厂商: ams
文件页数: 8/16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:
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
AS1337
Datasheet - D e t a i l e d D e s c r i p t i o n
8 Detailed Description
The AS1337 can operate from a single-cell input voltage (V IN ) below 1V, and features fixed frequency (1.2MHz) and current mode PWM control
for exceptional line- and load-regulation. With low R DS(ON) and gate charge internal NMOS and PMOS switches, the device maintains high-effi-
ciency from light to heavy loads.
Modern portable devices frequently spend extended time in low-power or standby modes, switching to high power-drain only when certain func-
tions are enabled. The AS1337 is ideal for portable devices since it maintains high-power conversion efficiency over a wide output power range,
thus increasing battery life in these types of applications.
In addition to high-efficiency at moderate and heavy loads, the AS1337 includes an automatic powersave mode that improves efficiency of the
power converter at light loads. The powersave mode is initiated if the output load current falls below a factory programmed threshold.
The Overtemperature protection circuitry turn-off both switches for a short time when the temperature reaches 145oC in the device .
Figure 13. AS1337 - Block Diagram
L1
6
POK
4.7μH
2 LX
1.5V
Single
Cell
C IN
1μF
7
VIN
Start Up
OSC
PWM
Control
A
B
A/B
MUX
Sync Drive
V OUT
Good
+
0.35 Ω 0.45 Ω
2.3V
1
VOUT
3.3V
Output
Control
1.2MHz
Ramp
Generator
Slope
Compensator
Σ
Current
Sense
C FF *
R 1
560k Ω
5
EN
Shutdown
Control
+
PWM –
Comp
Shutdown
Powersave
R C
80k Ω
C C
150pF
C P2
2.5pF
g m Error
Amp
+
1.23V
8
FB
C OUT
4.7μF
R 2
330k Ω
* Optional
Powersave
Operation
Control
AS1337
4 GND
3 PGND
Ref
Revision 1.05
7 - 15
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