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| 型号： | A4402KLPTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 1/17页 |
| 文件大小： | 0K |
| 描述： | IC REG DL BUCK/LINEAR 16-TSSOP |
| 标准包装： | 1 |
| 拓扑： | 降压（降压）（1），线性（LDO）（1） |
| 功能： | 车载 |
| 输出数： | 2 |
| 频率 - 开关： | 2MHz |
| 电压/电流 - 输出 1： | 3.3 V ~ 5 V，1A |
| 电压/电流 - 输出 2： | 1.8 V ~ 3.3 V，250mA |
| 带 LED 驱动器： | 无 |
| 带监控器： | 无 |
| 带序列发生器： | 无 |
| 电源电压： | 6 V ~ 50 V |
| 工作温度： | -40°C ~ 150°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-TSSOP（0.173"，4.40mm）裸露焊盘 |
| 供应商设备封装： | 16-TSSOP-EP |
| 包装： | 标准包装 |
| 其它名称： | 620-1462-6 |
A4402
Constant On-Time Buck Converter
With Integrated Linear Regulator
Features and Benefits
? 2 MHz switching frequency
? Adjustable soft start timer
? Watchdog input
? Power-on reset output
? Adjustable buck and linear regulators
? Enable input
? 6 to 50 V supply voltage range
? Overcurrent protection
? Undervoltage lockout (UVLO)
? Thermal shutdown protection
Applications:
A UTOMOTIVE (“K” VERSION ) C OMMERCIAL (“E” VERSION )
? Power steering control units ? Photo and inkjet printers
? Transmission control units ? Industrial controls
? Lighting control units ? Distributed power systems
? Infotainment ? Networking applications
? Cluster ? Point-of-sale
? Centerstack ? Security systems
? Other body control
Package: 16-pin TSSOP with exposed
thermal pad (suffix LP)
Description
The A4402 is a dual-output regulator, combining in a single
package a constant on-time buck regulator and a linear regulator
(LDO)—each with adjustable output voltages. It is ideal for
applications that require two regulated voltages, such as in
microcontroller- or DSP-based applications requiring core
and I/O voltage rails.
The buck regulator output supplies the adjustable linear
regulator to reduce power dissipation and increase overall
efficiency. The switching regulator is capable of operating
above 2 MHz, allowing the use of small low value inductors
and capacitors while avoiding sensitive EMI frequency bands
such as AM radio in automotive applications.
Protection features include undervoltage lockout and thermal
shutdown. In case of a shorted load, each regulator features
overcurrent protection.
The device has an integrated power-on reset with adjustable
delay to monitor LDO output voltage and provide a signal that
can be used to reset a DSP or microcontroller. It also includes
a watchdog circuit.
The A4402 is provided in a 16-pin TSSOP, with exposed pad
for enhanced thermal dissipation. It is lead (Pb) free, with
100% matte tin leadframe plating.
Not to scale
Typical Application
C TSET
0.15 μF
C POR
0.33 μF
TSET
POR
TON
A 4402
VIN1
BOOT
LX
ISEN
R ton
750 k?
0.1 μF
0.01 μF
RSENSE
L1
33 μH
10 μF
4 .7 μF
V BAT
Switching Regulator Output
V SW
5V
90
85
80
Efficiency vs. Output Current
5
3.3
V O2
20 k?
GND
GND
FB1
R1
31.6 k?
R2
9.76 k?
75
70
V OUT (V)
4.7 k?
NPOR
ENB
WDI
GND
VIN2
VO2
FB2
R3
10 k?
R4
5.62 k?
Linear Regulator Output
V LIN
3.3 V
250 mA
1 μF
65
60
0
200
400 600 800
I OUT (mA)
1000 1200
Data is for reference only. Efficiency data from circuit shown in left panel.
4402-DS, Rev. 11
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