参数资料
| 型号： | A4403GEUTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 1/16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
Features and Benefits
? Extremely fast load-transient response with minimal
output voltage delta
? Achieves high step-down ratios with on-times < 50 ns
? User-configurable on-time, achieving switching
frequencies up to 2 MHz
? Minimal external components required
? Optimized for low value filter capacitors and inductors
? Wide input voltage range: 9 to 46 V
? Output Current: 3 A
? Low standby current <100 μ A
? Supplied in thermally-enhanced QFN package
Applications:
Description
The A4403 is a buck converter that uses valley current-mode
control. This control scheme allows very short switch on-times
to be achieved, making it ideal for applications that require
high switching frequencies combined with high input voltages
and low output voltages.
Low cost is accomplished through high switching frequencies
of up to 2 MHz, allowing smaller and lower value inductors
and capacitors. In addition, minimal external components are
required through high levels of integration. Optimal drive
circuits are utilized to minimize switching losses.
The switching frequency is maintained constant, as the on-time
is modulated by the input voltage. This feed-forward control
? Printers, scanners
? Cable, DSL modems/routers
? Network and telecom
? Industrial control
? Distributed power systems
? Set top box
? High power LED supply
? Battery chargers
? GPS / Infotainment
ensures excellent line correction. The on-time is set by an
external resistor pulled-up to the input supply.
When power is initially applied and the device is enabled, a
user-configurable soft-start function occurs to minimize inrush
current and to prevent output overshoot. Internal housekeeping
Package 16-contact QFN (suffix EU):
4 mm × 4 mm × 0.75 mm
and bootstrap supplies are provided which only require the
addition of one small ceramic capacitor. A top-off charge pump
is also provide to ensure correct operation at light loads.
Internal diagnostics provide comprehensive protection against
overcurrents, input undervoltages, and overtemperatures.
The device package is a 16-contact, 4 mm × 4 mm, 0.75 mm
nominal overall height QFN, with exposed pad for enhanced
thermal dissipation. It is lead (Pb) free, with 100% matte tin
leadframe plating.
Typical Application Diagram
V IN
9 to 46 V
R1
100 k Ω
C1
2.2 μ F
100 V
VIN
A 4403
BOOT
LX
C2
22 nF
D1
L 1
6.3 μ H
V OUT
5.0 V
3A
90.00
Efficiency versus Output Current
V IN = 42 V
TON
DIS
ISEN
R3
50 m Ω
C3
10 μ F
6.3 V
C4
10 μ F
6.3 V
R5
3.92 k Ω
85.00
80.00
5V
3.3 V
75.00
C5
47 nF
SS
GND
SGND
FB
R6
750 Ω
70.00
65.00
60.00
0
1
2
3
Output Current (A)
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
4403-DS, Rev. 2
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