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首页小型微PMIC AS3701:低功耗应用的理想选择
小型微PMIC AS3701:低功耗应用的理想选择
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更新于2024-06-29
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"AMS-AS3701是一款针对小型和低功耗应用设计的微小集成电源管理集成电路(Micro-PMIC)。该设备具有高度集成的功能,包括一个从1MHz到4MHz工作的1.5A DC-DC降压转换器、两个200mA的通用线性稳压器(LDO),能够提供1.2V到3.3V的电压调节,以及两个40mA的电流源。它还配备了一个内置的线性电池充电器,支持恒流和恒压充电模式,充电电流范围从11mA扩展至500mA,且具备可选的NTC热敏电阻β值,适应广泛的应用场景。 AS3701的核心特性之一是其在紧凑设计中集成了多路电源轨,这对于需要节省空间且追求低功耗的系统来说是一个重要的优势。通过I²C接口进行控制,用户可以灵活地调整单电源电压,其工作范围可以从2.7V到5.5V。此外,两个可编程电流源进一步增强了其灵活性,允许根据需求进行精确的电流管理。 图1展示了使用AS3701的额外价值,主要体现在多个关键领域:首先,通过在一个小巧的封装内整合多种功能,设计师能够简化电路板布局,减少外部组件的需求,从而降低成本和提高系统效率。其次,宽广的电压和电流调节范围使得AS3701适用于不同类型的电子设备,无论是电池供电还是需要不同电压输出的场合。最后,内置的电池充电管理功能确保了电池的快速、安全和高效充电,延长了设备的使用寿命。 AMS-AS3701以其高度集成、多功能性和灵活性,成为小型化、低功耗电子设计的理想选择。对于那些寻求在有限空间内实现高效能源管理和系统简化方案的工程师而言,这款产品无疑提供了强大的解决方案。文档末尾的订购信息和内容指南提供了关于规格、引脚功能、安装示例等更详细的信息,以便用户能够充分利用这一先进的电源管理解决方案。"
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Page 16 ams Datasheet
Document Feedback [v1-11] 2016-Dec-14
AS3701 − Detailed Description – Power Management Functions
Figure 17:
DCDC Step-Down Converter External Components
Figure 18:
DCDC Step Down Converter Efficiency vs. Load Current at 1MHz
DCDC Efficiency vs. Output Current: V
SUP
= 3.7V, f
SW
= 1MHz, Murata LQM2HPN2R2MG0L 2.2μH coil,
T
AMB
= 25°C.
Symbol Parameter Note Min Typ Max Unit
C
FB_SD1
Output Capacitor Ceramic X5R or X7R 8 10 µF
C
VSUP_SD1
Input Capacitor Ceramic X5R or X7R 2.2 µF
L
SD1
Inductor
4MHz operation 1
µH
3MHz operation 1
2MHz operation 1
1MHz operation 2.2
10
20
30
40
50
60
70
80
90
100
0.001 0.01 0.1 1
Efficiency (%)
Output Current (A)
Vout = 0.6125V
Vout = 0.6125V, low noise
Vout = 1.2V, low noise
Vout = 1.2V
Vout = 1.8V, low noise
Vout = 1.8V
Vout = 3.0V, low noise
Vout = 3.0V
10
20
30
40
50
60
70
80
90
100
0.001 0.01 0.1 1
Efficiency (%)
Output Current (A)
Vout = 1.0V, low noise
Vout = 1.0V
Vout = 1.5V, low noise
Vout = 1.5V
Vout = 2.5V, low noise
Vout = 2.5V
Vout = 3.35V, low noise
Vout = 3.35V
ams Datasheet Page 17
[v1-11] 2016-Dec-14 Document Feedback
AS3701 − Detailed Description – Power Management Functions
Figure 19:
DCDC Step Down Converter Efficiency vs. Load Current at 2MHz
DCDC Efficiency vs. Output Current: V
SUP
= 3.7V, f
SW
= 2MHz, Murata LQM2HPN1R0MG0L 1μH coil, T
AMB
= 25°C.
Figure 20:
DCDC Step Down Converter Efficiency vs. Load Current at 3MHz
DCDC Efficiency vs. Output Current: V
SUP
= 3.7V, f
SW
= 3MHz, Murata LQM2HPN1R0MG0L 1μH coil, T
AMB
= 25°C.
10
20
30
40
50
60
70
80
90
100
0.001 0.01 0.1 1
Efficiency (%)
Output Current (A)
Vout = 1.0V, low noise
Vout = 1.0V
Vout = 1.5V, low noise
Vout = 1.5V
Vout = 2.5V, low noise
Vout = 2.5V
Vout = 3.35V, low noise
Vout = 3.35V
10
20
30
40
50
60
70
80
90
100
0.001 0.01 0.1 1
Efficiency (%)
Output Current (A)
Vout = 0.6125V, low noise
Vout = 0.6125V
Vout = 1.2V, low noise
Vout = 1.2V
Vout = 1.8V, low noise
Vout = 1.8V
Vout = 3.0V, low noise
Vout = 3.0V
10
20
30
40
50
60
70
80
90
100
0.001 0.01 0.1 1
Efficiency (%)
Output Current (A)
Vout = 0.6125V, low noise
Vout = 0.6125V
Vout = 1.2V, low noise
Vout = 1.2V
Vout = 1.8V, low noise
Vout = 1.8V
Vout = 3.0V, low noise
Vout = 3.0V
10
20
30
40
50
60
70
80
90
100
0.001 0.01 0.1 1
Efficiency (%)
Output Current (A)
Vout = 1.0V, low noise
Vout = 1.0V
Vout = 1.5V, low noise
Vout = 1.5V
Vout = 2.5V, low noise
Vout = 2.5V
Vout = 3.35V, low noise
Vout = 3.35V
Page 18 ams Datasheet
Document Feedback [v1-11] 2016-Dec-14
AS3701 − Detailed Description – Power Management Functions
Figure 21:
DCDC Step Down Converter Efficiency vs. Load Current at 4MHz
DCDC Efficiency vs. Output Current: V
SUP
= 3.7V, f
SW
= 4MHz, Murata LQM2HPN1R0MG0L 1μH coil, T
AMB
= 25°C.
10
20
30
40
50
60
70
80
90
100
0.001 0.01 0.1 1
Efficiency (%)
Output Current (A)
Vout = 0.6125V, low noise
Vout = 0.6125V
Vout = 1.2V, low noise
Vout = 1.2V
Vout = 1.8V, low noise
Vout = 1.8V
Vout = 3.0V, low noise
Vout = 3.0V
10
20
30
40
50
60
70
80
90
100
0.001 0.01 0.1 1
Efficiency (%)
Output Current (A)
Vout = 1.0V, low noise
Vout = 1.0V
Vout = 1.5V, low noise
Vout = 1.5V
Vout = 2.5V, low noise
Vout = 2.5V
Vout = 3.35V, low noise
Vout = 3.35V
ams Datasheet Page 19
[v1-11] 2016-Dec-14 Document Feedback
AS3701 − Detailed Description – Power Management Functions
Universal IO LDO Regulator
This LDO is a low-power and low-quiescent current
linear-regulator specifically designed for space-limited
applications. This device can supply loads up to 200mA and
consist of an error amplifier, and a P-channel MOSFET pass
transistor.
Figure 22:
Universal IO LDO Regulator Block Diagram
Parameters
Figure 23:
Universal IO LDO Regulator Electrical Characteristics
Symbol Parameter Note Min Typ Max Unit
V
IN
Input voltage Pin VSUP 2.7 5.5 V
∆V
OUT
Output voltage
accuracy
I
OUT
= 1mA, V
OUT
> 2V T
AMB
=
25°C
Guaranteed by design
-2.5 +2.5
%
I
OUT
= 100μA to 200mA
V
OUT
> 2V
-3 +3
I
OUT
= 1mA, V
OUT
≤ 2V
T
AMB
= 25°C
Guaranteed by design
-20 +20
mV
I
OUT
= 100μA to 200mA
V
OUT
≤ 2V
-50 +50
+
-
VSUP
LDOx
Error
Amplifier
Vref
2.2uF
2.2uF
Page 20 ams Datasheet
Document Feedback [v1-11] 2016-Dec-14
AS3701 − Detailed Description – Power Management Functions
Figure 24:
Universal IO LDO Regulator External Components
V
OUT
Output voltage range 1.2 3.3 V
V
LNR
Line regulation static
V
IN
= 2.7V to 5.5V
I
OUT
= 1mA
0.07 %/V
Line regulation
dynamic
V
IN
= 2.7V to 5.5V within 15μs
I
OUT
= 1mA
20 mV
V
LDR
Load regulation static
I
OUT
= 100μA to 200mA
0.014 %/mA
Load regulation
dynamic
I
OUT
= 100μA to 200mA within
15μs
30 mV
R
ON
ON resistance 0.5 1 Ω
I
OUT
Guaranteed load
current
RMS 200 mA
I
LIMIT
Short-circuit
V
OUT
= 0V
230 mA
I
Q
Quiescent current
No Load 5
μA
I
OUT
= 100µA
5
I
OUT
= 200mA
15
I
OFF
Shutdown supply
current
LDO disabled 0.1 1 μA
eN Output noise
BW = 10Hz to 100Hz;
V
OUT
= 1.2V; I
OUT
= 1mA;
C
OUT
= 2.2μF
112
μVrms
BW = 10Hz to 100Hz;
V
OUT
= 3.3V; I
OUT
= 1mA;
C
OUT
= 2.2μF
205
t
START
Startup time 750 μs
t
SHUTDOWN
Shutdown time 500 μs
Symbol Parameter Note Min Typ Max Unit
C
LDOx
Output capacitor Ceramic X5R or X7R 2.2 4.7 µF
Symbol Parameter Note Min Typ Max Unit
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