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| A5974D Datasheet, PDF (1/46 Pages) STMicroelectronics – Zero load current operation | |||
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A5974D
Up to 2.5 A step-down switching regulator for automotive
applications
Datasheet - production data
HSOP8 - exposed pad
Application
ï· Dedicated to automotive applications
Description
Features
ï· Qualified following the AEC-Q100
requirements (see PPAP for more details)
ï· 2.5 A DC output current
ï· Operating input voltage from 4 V to 36 V
ï· 3.3 V / (± 2%) reference voltage
ï· Output voltage adjustable from 1.235 V to 35 V
ï· Low dropout operation: 100% duty cycle
ï· 250 kHz internally fixed frequency
ï· Voltage feed-forward
ï· Zero load current operation
ï· Internal current limiting
ï· Inhibit for zero current consumption
ï· Synchronization
ï· Protection against feedback disconnection
The A5974D is a step-down monolithic power
switching regulator with a minimum switch current
limit of 3.1 A, so it is able to deliver up to 2.5 A DC
current to the load depending on the application
conditions. The output voltage can be set from
1.235 V to 35 V. The high current level is also
achieved thanks to an HSOP8 package with an
exposed frame, that allows to reduce the Rth(JA)
down to approximately 40 °C/W. The device uses
an internal P-channel DMOS transistor (with
a typical RDS(on) of 250 mï) as a switching
element to minimize the size of the external
components. An internal oscillator fixes the
switching frequency at 250 kHz. Having
a minimum input voltage of 4 V only it fits the
automotive applications requiring the device
operation even in cold crank conditions. A pulse-
by-pulse current limit with the internal frequency
modulation offers an effective constant current
short-circuit protection.
ï· Thermal shutdown
Figure 1. Application schematic
VIN =4V TO 36V
TP1
C1
10uF
50V
TP3
GND
U1
8 VCC
6 VREF
2 SYNC
A5974D
4 COMP
INH
EX-PAD
VOUT 1
FB 5
GND
L1 15uH
TP2
VOUT
R1
5.6K
C2
68nF
50V
R3
3
9
7
10K
C3
100p
C4
33nF
D1
R2
3.3K
C9
330uF
small signal
power plane
TP4
GND
June 2014
This is information on a product in full production.
DocID018774 Rev 2
1/46
www.st.com
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