DC-DC Converters

SILICA | The Engineers of Distribution.
DC-DC Converters
L6984, L6986
Energy saving synchronous
DC-DC converters with extremely
low quiescent current
L7985, L7986, L7987 and ST1S14
High performance switching
regulators for industrial – ideal
for fail safe systems
L6984 and L6986 are perfect solutions for industrial
applications. These devices are able to provide up to 2 A of
continuous output current and come with a wide input
voltage range from 4 V up to 38 V, depending on the part
number chosen.
High flexibility is given by several adjustable parameters,
like output voltage, switching frequency and synchronization
capability. Moreover the extreme low operating quiescent
current makes these devices suitable for energy saving and
low power consumption stand-by applications.
L7985, L7986, L7987 and ST1S14 are tailored for industrial
applications and fail safe systems. These devices are able to
provide up to 3 A of continuous output current and offer a wide
input voltage range from 4.5 V up to 61 V, depending on the part
number chosen. High flexibility is given by several adjustable
parameters, like output voltage, switching frequency, current
limit and soft start to name a few.
KEY FEATURES
• High switching frequency up to 2 MHz
• Wide input voltage range up to 38 V
• Very low operating quiescent current 30 uA
• Synchronous rectification
• Full embedded protection
KEY APPLICATIONS
• Industrial applications
• Fail safe systems
• Factory automation
• Building automation
• PLCs
• 12 V and 24 V bus applications
KEY FEATURES
• High switching frequency up to 1.5 MHz
• Wide input voltage range up to 61 V
• Full set of embedded protection functions
• Extended operation junction temperature
BLOCK DIAGRAM
Digital I/O
Power supply line
12 V - 24 V
VIN
Sensors
DC-DC
Analog output
modules 1..
Analog output
modules #
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SILICA | The Engineers of Distribution.
DEVICE SUMMARY
L6984, L6986
Part Number
Package
L6984
L6984A(*)
L6986
DFN4x4 10L
DFN3x3 10L
HTSSOP 16
Input voltage range (V)
4.5 to 36
4.5 to 36
4 to 38
Output current max (A)
0.35
0.35
2
Operating quiescent current max (μA)
100
100
30
High side RDSON (Ω)
1.26
1.26
0.18
Low side RDSON (Ω)
0.77
0.77
0.11
3.3 fixed
0.9 to 95% VIN adjustable
3.3 fixed
0.9 to 95% VIN adjustable
0.85 to VIN
Output voltage range (V)
Switching frequency (kHz)
200 to 600
200 to 600
250 to 2000
External synchronization frequency (kHz)
N.A.
N.A.
Up to 2000
Low noise/low consumption selection
mode
Yes
Yes
Yes
Enable pin, PGood
Enable pin, PGood
Enable pin, Adjustable soft
start and reset
-40, 150
-40, 150
-40, 150
Additional features
Operating junction temperature (Tj °C)
(*) Coming soon
L7985, L7986, L7987 and ST1S14
Part Number
Package
Input voltage (V)
L7985, L7985A
L7986, L7986A
L7986TA
ST1S14
L7987(*)
L7987L(*)
DFN3x3 10L/
HSOP 8
DFN3x3 10L/
HSOP 8
HSOP 8
HSOP 8
HTSSOP 16
HTSSOP 16
4.5 to 38
4.5 to 38
4.5 to 38
5.5 to 48
4.5 to 61
4.5 to 61
Output current (A)
2
3
3
3
Up to 3
Up to 2
Output voltage (V)
0.6 to VIN
0.6 to VIN
0.6 to VIN
0.8 to 97% VIN
0.8 to 97% VIN
0.8 to 97% VIN
Switching frequency
(kHz)
250 to 1000
250 to 1000
250 to 1000
850
250 to 1500
250 to 1500
External synch.
frequency (kHz)
Up to 1000
Up to 1000
Up to 1000
N.A
Up to 1500
Up to 1500
Additional features
Enable pin,
Soft start
Enable pin,
Soft start
Enable pin,
Soft start
Enable/Inhibit
pin, PGood,
Soft start
Adjustable
current limit,
Adjustable soft
start, Enable pin,
PGood
Adjustable
current limit,
Adjustable soft
start, Enable pin,
PGood
Operating junction
temperature (Tj °C)
-40, 150
-40, 150
-40, 150
-40, 150
-40, 150
-40, 150
Parameters
guaranteed over the
temperature Tj (°C)
25
25
-40, 125
25
25
25
(*) Coming soon
August 2014
Discover more Power Products from ST & SILICA at: www.silica.com/ST-power
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