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PDF A2550 Data sheet ( Hoja de datos )
| Número de pieza | A2550 | |
| Descripción | Relay Driver | |
| Fabricantes | Allegro MicroSystems | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de A2550 (archivo pdf) en la parte inferior de esta página. Total 16 Páginas | ||
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A2550
Relay Driver with 5 V Regulator
for Automotive Applications
Features and Benefits
▪ Three independent low-side DMOS output drivers
▪ Short-circuit protection of drivers
▪ Eliminates need for flyback diodes on relays
▪ Thermal shutdown
▪ Separate precision 5 V regulator (2%)
▪ Current clamp on 5 V regulator
▪ 16-pin TSSOP package with exposed thermal pad
▪ Programmable reset (NPOR) delay time
▪ Programmable watchdog
▪ Automotive voltage and temperature ranges
▪ Active clamps for automotive load dump specifications
▪ Lead (Pb) free
Package: 16 pin TSSOP (suffix LP) with
exposed pad
Description
Large numbers of relay-based applications require the use of a
microprocessor which implements complex system control. In
these systems, there is the need for microprocessor logic supply
voltage, power-on reset circuitry, and watchdog capabilities.The
Allegro® A2550 combines the functions of voltage regulator,
watchdog, and reset, as well as three low-side DMOS relay
driver outputs. Primarily targeted at automotive applications,
this IC is designed to provide robust performance over extended
voltage and temperature ranges.
Three low-side DMOS drivers can drive inductive loads, such
as relay coils. Each driver integrates rugged voltage clamps
which survive automotive load dump pulses up to 48 V. The
40 V rating on VBB also ensures adequate survival in harsh
automotive environments.
A 5 V linear regulator provides 40 mA of output current, with
a tolerance of 2% over the operating temperature range. To
enhance the usefulness of the IC in automotive applications,
the 5 V regulator output, as well as the three low-side driver
outputs are protected against overcurrent conditions.
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Approximate Scale
Continued on the next page…
Typical Application
System
Logic
1
IN1
OUT1 16
2
IN2
OUT2 15
3
IN3
A2550 OUT3 14
4
LGND
PGND 13
5
NPOR
CWD 12
6
WDI
CPOR 11
7
EN
ENBAT 10
8
VREG5
VBB 9
0.47 μF
X7R
Relays or other
inductive loads
2550-DS
1 page  
A2550
Relay Driver with 5 V Regulator
for Automotive Applications
ELECTRICAL CHARACTERISTICS, continued –40°C ≤ TJ ≤ 150°C, VBB within operating limits, unless otherwise noted
Characteristics
Symbol
Test Conditions
Min. Typ. Max.
Watchdog and Power-On Reset
NPOR Active Voltage
NPOR Inactive Leakage Current
CWD and CPOR Trip Voltage
CPOR Charge Current
Power-On Reset Cycle Time5
CWD Charge Current
VNPOR INPOR = 1 mA; VREG5 = 1.5 V; 1.5 V ≤ VBB ≤ 40 V –
– 400
INPOR(Off) VNPOR = 5 V
– – 10
VTRIP(H) VTRIP(H) = VREF
– 1.2 –
VTRIP(L)
– 0.2 –
IPOR
2.5 5 7.5
tPOR
CPOR = 0.22 μF
– 44 –
ICWD
Charging
Discharging
2.5 5 7.5
– 70 –
Thermal Protection
Thermal Shut Down Threshold
Thermal Shut Down Hysteresis
TTSD
TTSDhys
– 175 –
– 15 –
1See Applications Information section for operation with VBB < 7 V. For VBB > 24 V, thermal constraints limit regulator current.
2For input and output current specifications, negative current is defined as coming out of (sourcing) the specified device pin.
3When VENBAT exceeds VBB it is clamped with a diode. (VENBAT – VBB) ≤ 1.2 V at 40 mA.
4Defined as the maximum current level allowed during excessive load condition.
5See Applications Information section for calculations. Values guaranteed by design, and depend on capacitor tolerances.
Units
mV
μA
V
V
μA
ms
μA
μA
°C
°C
THERMAL CHARACTERISTICS may require derating at maximum conditions, see application information
Characteristic
Symbol
Test Conditions*
Thermal Resistance, Junction to Pad
RθJP
Thermal Resistance, Junction to
Ambient
RθJA
4-layer PCB based on JEDEC standard
2-layer PCB with 2 in.2 copper both sides, connected by thermal vias
Maximum Allowable Power Dissipation
RθJA = 44 ºC/W (estimated), 2-layer PCB with 2.0 in.2 of 2 oz. copper,
PD
TA = 125°C
RθJA = 44 ºC/W (estimated), 2-layer PCB with 2.0 in.2 of 2 oz. copper,
TA = 85°C
*Additional thermal data available on the Allegro Web site.
Value Units
2 ºC/W
34 ºC/W
44 ºC/W
0.57 W
1.48 W
Allegro MicroSystems, Inc.
5
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
5 Page 
A2550
Relay Driver with 5 V Regulator
for Automotive Applications
Timing Diagram: VREG5 UVLO and TSD Monitoring
VBB
VREG5
WDI
CWD
Internal
VREG5 UVLO
CPOR
NPOR
Internal
TSD
OUTx outputs enabled
1
2
VUVREG5
Internal Vref
Internal Vref
~INx
34
5
~INx
1. VREG5 undervoltage detected.
2. VREG5 recovers, and after it rises above VUVREG5 + VUVREG5(Hys),
UVLO flag is deactivated and CPOR recharges.
3. NPOR inactive, but outputs not enabled until watchdog detected.
4. TSD event detected and NPOR is activated. When VREG5 ≤ VUVREG5,
VREG5 shuts down.
5. TSD flag deactivated (VREG5 allowed to rise; steps 2 and 3 repeat)
Allegro MicroSystems, Inc.
11
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet A2550.PDF ] | |
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