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A4409KLPTR-T

产品描述IC REG TRPL BUCK/LINEAR 20ETSSOP
产品类别半导体    电源管理   
文件大小2MB,共31页
制造商Allegro
官网地址http://www.allegromicro.com/
标准
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A4409KLPTR-T概述

IC REG TRPL BUCK/LINEAR 20ETSSOP

A4409KLPTR-T规格参数

参数名称属性值
拓扑降压(1)或降压/升压(1),线性(LDO)(2)
功能汽车级
输出数3
频率 - 开关400kHz ~ 2.4MHz
电压/电流 - 输出 10.8 V ~ 3.3 V,800mA
电压/电流 - 输出 26V/6.6V、1A
电压/电流 - 输出 35V、150mA
带 LED 驱动器
带监控器
带定序器
电压 - 电源3 V ~ 36 V
工作温度-40°C ~ 135°C
安装类型表面贴装
封装/外壳20-TSSOP(0.173",4.40mm 宽)裸露焊盘
供应商器件封装20-TSSOP-EP

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A4409
Adjustable Frequency Buck or Buck-Boost Pre-Regulator with
2 LDOs, Window Watchdog Timer, and NPOR
FEATURES AND BENEFITS
Automotive AEC-Q100 qualified
V
IN
operating range from 3 to 36 V, with 40 V maximum
Buck or buck-boost pre-regulator (VREG)
Adjustable PWM switching frequency: 250 kHz to 2.4 MHz
PWM frequency can be synchronized to external clock
Two 5 V internal LDO regulators with foldback short-
circuit protection
Power-on reset (NPOR) with fixed delay of 22.5 ms
Programmable window watchdog timer with a fixed
activation delay of 30 ms
Active low, watchdog timer enable/disable pin (WD
ENn
)
Dual bandgaps for increased reliability:
BG1 for VREG, 5V0, and VCP reference
BG2 for V5 reference, and VREG, 5V0, and VCP fault
detection
Ignition-enable input (ENBAT)
Frequency dithering helps reduce EMI/EMC
Undervoltage protection for all output rails
Pin-to-pin and pin-to-ground tolerant at every pin
Thermal shutdown protection
−40°C to 150°C junction temperature range
DESCRIPTION
The A4409 is a power management IC that uses a buck or
buck-boost pre-regulator to efficiently convert automotive
battery voltages into a tightly regulated intermediate voltage,
complete with control, diagnostics, and protections. The output
of the pre-regulator supplies a 5 V, 300 mA
MIN
LDO and a 5 V,
200 mA
MIN
LDO. Designed to supply CAN or microprocessor
power supplies in high-temperature environments, the A4409
is ideal for underhood applications.
Enable-input to the A4409 is compatible to a high-voltage
battery level (ENBAT).
Diagnostic outputs from the A4409 include a power-on-reset
output (NPOR) with a fixed 22.5 ms typical delay. Dual
bandgaps, one for regulation and one for fault checking, improve
long-term reliability of a system designed around the A4409.
The A4409 contains a window watchdog timer that can be
programmed to accept a wide range of clock frequencies
(WD
ADJ
). The watchdog timer has a fixed 30 ms activation
delay to accommodate processor startup. The watchdog timer
has an enable/disable pin (active low, WD
ENn
) to facilitate
initial factory programming or field reflash programming.
Continued on next page...
PACKAGE: 20-Pin eTSSOP (suffix LP)
APPLICATIONS
Provides system power for (microcontroller/DSP, CAN, sen-
sors, etc.) in automototive control modules, such as:
Electronic power steering (EPS)
Transmission control units (TCU)
Advanced braking systems (ABS)
Emissions control modules
Other automotive applications
Not to scale
6.6 V
(VREG)
Buck-Boost
Pre-Regulator
5 V LDO
(V5)
with Foldback
Protection
5 V LDO
(5V0)
with Foldback
Protection
Bandgap 1
Bandgap 2
Charge
Pump
Thermal
Shutdown
(TSD)
NPOR
Output
Programmable
Window Watchdog
Timer with
Activation Delay
A4409 Simplified Block Diagram
A4409-DS, Rev. 5
MCO-0000318
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