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A7986A 데이터시트 PDF




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부품번호 A7986A 기능
기능 3A step-down switching regulator
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A7986A 데이터시트, 핀배열, 회로
A7986A
3 A step-down switching regulator for automotive applications
Datasheet - production data
Applications
Dedicated to automotive applications
Automotive LED driving
HSOP8 exposed pad
Features
Qualified following AEC-Q100 requirements
3 A DC output current
4.5 V to 38 V input voltage
Output voltage adjustable from 0.6 V
250 kHz switching frequency, programmable
up to 1 MHz
Internal soft-start and enable
Low dropout operation: 100% duty cycle
Voltage feed-forward
Zero load current operation
Overcurrent and thermal protection
HSOP8 package
Description
The A7986A is a step-down switching regulator
with a 3.7 A (min.) current limited embedded
Power MOSFET, so it is able to deliver up to 3 A
current to the load depending on the application
conditions.
The input voltage can range from 4.5 V to 38 V,
while the output voltage can be set starting from
0.6 V to VIN.
Requiring a minimum set of external components,
the device includes an internal 250 kHz switching
frequency oscillator that can be externally
adjusted up to 1 MHz.
The HSOP8 package with exposed pad allows
the reduction of Rth(JA) down to 40 °C/W.
Figure 1. Application circuit
March 2014
This is information on a product in full production.
DocID022801 Rev 6
1/42
www.st.com




A7986A pdf, 반도체, 판매, 대치품
Pin settings
1 Pin settings
1.1 Pin connection
Figure 2. Pin connection (top view)
A7986A
1.2
Pin description
Table 1. Pin description
N. Type
Description
1 OUT Regulator output.
Master/slave synchronization. When it is left floating, a signal with
a phase shift of half a period in respect to the power turn-on is present at
the pin. When connected to an external signal at a frequency higher than
2
SYNCH
the internal one, the device is synchronized by the external signal, with
zero phase shift.
Connecting together the SYNCH pins of two devices, the one with the
higher frequency works as master and the other as slave; so the two
powers turn-ons have a phase shift of half a period.
3
EN
A logical signal (active high) enables the device. With EN higher than
1.2 V the device is ON and with EN lower than 0.3 V the device is OFF.
4 COMP Error amplifier output to be used for loop frequency compensation.
Feedback input. Connecting the output voltage directly to this pin the
5 FB output voltage is regulated at 0.6 V. To have higher regulated voltages an
external resistor divider is required from VOUT to the FB pin.
The switching frequency can be increased connecting an external
6 FSW resistor from the FSW pin and ground. If this pin is left floating the device
works at its free-running frequency of 250 KHz.
7 GND Ground.
8 VCC Unregulated DC input voltage.
4/42 DocID022801 Rev 6

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A7986A 전자부품, 판매, 대치품
A7986A
Electrical characteristics
Table 4. Electrical characteristics (continued)
Symbol
Parameter
Test conditions
Values
Min. Typ. Max.
IO SINK
GV
Sink COMP pin
Open loop voltage gain
Synchronization function
VFB = 0.7 V, VCOMP = 0.75 V
(1)
30
100
VS_IN,HI
VS_IN,LO
High input voltage
Low input voltage
tS_IN_PW Input pulse width
ISYNCH,LO
VS_OUT,HI
tS_OUT_PW
Protection
Slave sink current
Master output amplitude
Output pulse width
VS_IN,HI = 3 V, VS_IN,LO = 0 V
VS_IN,HI = 2 V, VS_IN,LO = 1 V
VSYNCH = 2.9 V
ISOURCE = 4.5 mA
SYNCH floating
2
100
300
0.7
2
110
3.3
1
1
TSHDN
Thermal shutdown
Hysteresis
150
30
1. Guaranteed by design.
Unit
mA
dB
V
ns
mA
V
ns
°C
DocID022801 Rev 6
7/42
42

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A7986A

3A step-down switching regulator

STMicroelectronics
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