参数资料
| 型号： | A4403GEUTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 3/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 3A 16QFN |
| 标准包装： | 1 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 可调至 0.8V |
| 输入电压： | 9 V ~ 46 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 450kHz ~ 2MHz |
| 电流 - 输出： | 3A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 105°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-WQFN 裸露焊盘 |
| 包装： | 标准包装 |
| 供应商设备封装： | 16-QFN（4x4） |
| 产品目录页面： | 1141 (CN2011-ZH PDF) |
| 其它名称： | 620-1273-6 |
A4403
Valley Current Mode Control Buck Converter
Functional Block Diagram
V IN 9 to 44.1 V
C1
2.2 μ F
VIN
BOOT
C2
22 nF
R1
68 k Ω
R2
Not
Fitted
Sleep
Circuit
Linear
Regulator
Driver
Top-off
Charge
Pump
V IN
LX
L1
4.7 μ H
C3
10 μ F
C4
10 μ F
V OUT
3.3 V
3A
TON
On
Timer
Control
D1
DIS
Off
Timer
Logic
Blank
Overvoltage Reg Ref
ISEN
R3
100 m Ω
R4
100 m Ω
C6
10 nF
R5
2.37 k Ω
Switch
Closed = On
+
Comparator +80 mV
SGND
FB
VIN UVLO
Linear OK
Fault
–
Regulator
Comparator
Amplifier
TSD
Soft-Start
Reg Ref
R6
750 Ω
SS
C5
47 nF
NC
GND
Switching Frequency = 1 MHz
All capacitors are X5R or X7R ceramic
Resistors R3 and R4 should be surface mount, low inductance type, rated at 250 mW at 70°C
C6 is an optional speed-up capacitor, to improve the transient response
Terminal List Table
Number
1
Name
VIN
Input supply
Function
Pin-out Diagram
2, 7, 13, 14, 15, 16
3
4
NC
TON
SS
No connection; tie to GND
Terminal for on-time setting with external resistor
Terminal for soft-start setting with external capacitor
VIN
NC
TON
1
2
3
PAD
12 LX
11 BOOT
10 DIS
5
6
8
FB
GND
ISEN
Feedback terminal
Ground terminal
Current sense input
SS
4
9
SGND
9
SGND
Current sense ground reference
10
11
DIS
BOOT
Disable logic input; active high
Bootstrap supply node
(Top View)
12
–
LX
PAD
Switch node
Exposed thermal pad; connect to ground plane
(GND) by through-hole vias
Allegro MicroSystems, LLC
115 Northeast Cutoff
3
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
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