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PDF ATA6405 Data sheet ( Hoja de datos )
| Número de pieza | ATA6405 | |
| Descripción | 12/24V SYSTEM POWER SUPPLY IC | |
| Fabricantes | ATMEL Corporation | |
| Logotipo |  |
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Features
• Input Voltage: 8 V to 40 V
• Output Voltage Linear Regulator: 5 V/50 mA/3 mA
• ON_NOFF (High Active) Input
• Window Watchdog
• OFF Mode Quiescent current < 10 µA
• Standby Mode Quiescent Current < 30 µA
• Temperature Range: -40° C to 125°C
• Reset Logic
• Select Pin Standby/OFF Mode
Description
The ATA6405 is a fully integrated system voltage supply IC. The device is designed for
the 12/24 V board voltage system in a motor vehicle. In order to minimize power con-
sumption, a switching regulator generates a voltage for supplying the internal linear
regulator with a 5 V output voltage for microcontrollers.
To monitor the microcontroller, provision has been made for a window watchdog fea-
ture incorporating a reset logic function. The voltage system IC has three modes:
active, Standby and OFF. One control input serves to facilitate the selection between
the active and Standby modes. Another input permits the selection between the
Standby and OFF modes. In the OFF mode, a maximum quiescent current of less
than 10 µA flows through the system and in Standby mode quiescent current less than
30 µA.
www.DataSheet4U.com
12/24 V System
Power Supply IC
ATA6405
Preliminary
Rev. 4737B–AUTO–08/04
1 page  
Operating Sequence
Reset
ATA6405 [Preliminary]
www.DataSheet4U.com
Whenever a voltage having a typically greater value than 7.55 V is applied to the VB pin,
the switching regulator can be run up (after a brief initialization phase of approximately
100 µs) by switching from the OFF mode to the ON mode. As soon as transient build-up
is just about to transpire, the LR1 linear regulator is automatically switched on, applying
a typical output voltage of 5.6 V to the VSR pin.
As long as transient build-up has not yet taken place on the LR1 linear regulator, a reset
will be put out on the NRES pin (reset for the microcontroller supplied by the linear regu-
lator). As soon as the typical output voltage of 4.75 V has been exceeded on the VLR
pin, the reset will terminate with a delay of approximately 10 ms. This period covers the
transient build-up phase on the oscillator of the microcontroller.
In the event pin VLR falls below the typical limiting values, a reset will be put out. In the
event of excess temperature occurring or if the supply voltage falls below the specified
limiting value, both voltage regulators will be immobilized. This will also lead indirectly to
the reset state, which will remain in force until pin VB voltage drops to approximately
2.5 V.
The further sequence of operations after termination of the ON mode unleashed by
switching to ON_NOFF will depend on the wiring of the NSTB pin (also refer to the pre-
vious description). The switching regulator and linear regulator are switched off
irrespective of the NSTB pin. If the Standby mode has been selected, the first linear reg-
ulator (LR1) will be substituted by a second linear regulator of lower power capacity, this
being fed directly via the VB pin. For minimized current consumption all further functions
will switched off. These are the internal supply, the oscillator with the related voltage
monitoring controllers, the temperature controlling monitor and the watchdog. Enabling
of the Standby mode is only possible after an ON-MODE phase. Initial application of the
supply voltage will prove insufficient.
With the transfer from the Standby to the ON mode, activated by the switching pin
ON_NOFF, the pin NRES remains high in the first time (with external resistor). Due to
the functionality there is the same procedure as the one at the end of the generation of
the reset output (LOW HIGH transmission at NRES). Also see section “RESET” and
“Watchdog” on page 6.
The purpose of the reset function is to transform the microcontroller to be monitored into
a predefined state. In order to achieve this, the NRES pin is drawn internally (or exter-
nally) on ground potential. In the OFF mode the reset signal is active permanently. After
switching into the ON mode the reset signal remains for 10 ms, typically, after transient
build-up of all voltage regulators.
Outputting of the reset in the ON mode may be triggered due to a variety of different rea-
sons. In case of undervoltage at pin VLR the reset occurs immediately. The turn-off
delay is typically 10 ms and starts with the end of the event. The activation of the watch-
dog generates a reset of 10 ms. Undervoltage at pin VB or overtemperature will switch
off all voltage regulators and a reset is generated due to undervoltage at pin VLR. With
the changeover from the ON mode to the Standby mode the reset is locked in any time.
The reset is also locked with the return to the ON mode as long as all voltage regulators
have finished the transient build-up.
4737B–AUTO–08/04
5
5 Page 
Ordering Information
Extended Type Number
ATA6405-PKQ
Package Information
Package
QFN28
ATA6405 [Preliminary]
www.DataSheet4U.com
Remarks
Voltage Regulator
4737B–AUTO–08/04
11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet ATA6405.PDF ] | |
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