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PDF L6984A Data sheet ( Hoja de datos )
| Número de pieza | L6984A | |
| Descripción | synchronous step-down switching regulator | |
| Fabricantes | STMicroelectronics | |
| Logotipo |  |
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L6984
36 V 400 mA synchronous step-down switching regulator
Datasheet - production data
VFDFPN10 4 x 4 x 1.0 mm
VDFPN10 3 x 3 x 1.0 mm
Features
400 mA DC output current
4.5 V to 36 V operating input voltage
Synchronous rectification
Low consumption mode or low noise mode
100 µA IQ at light load (LCM VOUT = 3.3 V)
13 µA IQ-SHTDWN
Adjustable fSW (250 kHz - 600 kHz)
Output voltage adjustable from 0.9 V
No resistor divider required for 3.3 V VOUT
VBIAS maximizes efficiency at light load
350 mA valley current limit
Constant on-time control scheme
PGOOD open collector
Thermal shutdown
Application
Automotive systems (LCM)
Battery powered applications (LCM)
Car audio and low noise applications (LNM)
Sensors (LNM)
E- metering
Description
The L6984 is a step-down monolithic switching
regulator able to deliver up to 400 mA DC. The
output voltage adjustability ranges from 0.9 V. The
fixed 3.3 V VOUT requires no external resistor
divider. The “Low Consumption Mode” (LCM) is
designed for applications active during car
parking, so it maximizes the efficiency at light load
with controlled output voltage ripple. The “Low
Noise Mode” (LNM) makes the switching
frequency almost constant over the load current
range, serving low noise application specification
like car audio/sensors. The PGOOD open
collector output can implement output voltage
sequencing during the power-up phase. The
synchronous rectification, designed for high
efficiency at medium - heavy load, and the high
switching frequency capability make the size of
the application compact. Pulse-by-pulse current
sensing on low-side power element implements
an effective constant current protection.
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Figure 1. Application schematic
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July 2014
This is information on a product in full production.
DocID025378 Rev 3
1/34
www.st.com
1 page  
L6984
1.3
Pin settings
Maximum ratings
Stressing the device above the rating listed in Table 2: Absolute maximum ratings may
cause permanent damage to the device.
These are stress ratings only and operation of the device at these or any other conditions
above those indicated in Table 5 of this specification is not implied.
Exposure to absolute maximum rating conditions may affect device reliability.
Symbol
VIN
EN
LX
TON
VCC
VBIAS
PGOOD
FB
LNM
TJ
TSTG
TLEAD
IHS, ILS
Table 2. Absolute maximum ratings
Description
Min.
-0.3
Max.
40
see Table 1
-0.3 VIN + 0.3
-0.3 6
Operating temperature range
Storage temperature range
Lead temperature (soldering
10 sec.)
High-side RMS switch current
Low-side RMS switch current
-0.3
-40
VCC + 0.3
150
-55 to 150
260
420
500
Unit
V
°C
mA
1.4
Thermal data
Symbol
Rth JA
Table 3. Thermal data
Parameter
Thermal resistance junction ambient
(device soldered on the STMicroelectronics®
evaluation board)
Value
50
Unit
C/W
DocID025378 Rev 3
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34
5 Page 
L6984
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Device description
Figure 3. L6984 block diagram
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DocID025378 Rev 3
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34
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet L6984A.PDF ] | |
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