L7986TR Datasheet, PDF (1/43 Pages) STMicroelectronics – 3 A step-down switching regulator

L7986
3 A step-down switching regulator
Datasheet - production data
VFQFPN10 3 x 3 mm
HSOP8 exp. pad
Features
 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
 VFQFPN 3 x 3 - 10L and HSOP8 package
Applications
 Consumer: STB, DVD, DVD recorder, car
audio, LCD TV and monitors
 Industrial: PLD, PLA, FPGA, chargers
 Networking: XDSL, modems, DC-DC modules
 Computer: optical storage, hard disk drive,
printers, audio/graphic cards
 LED driving
Description
The L7986/A is a step-down switching regulator
with a 3.7 A (minimum) 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 V_IN. 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
QFN and the HSOP packages with exposed pad
allow reducing the R_thJA down to 60 °C/W and 40
°C/W respectively.
9LQ 9  9
&
9&& _
*1'

)6: _
)% _
Figure 1. Application circuit
/
 ²⁸⁷
6<1&+

 ⁽¹
 ^&203
/
'
5
9287 IURP 9 WR 9LQ
&
*1'
&
5
5
&
5
*1'
$0
September 2014
This is information on a product in full production.
DocID022450 Rev 6
1/43
www.st.com