IC DRIVER MOSF SYNC BUCK 55MLPQ

 

SIC417CD-T1-E3

Manufacturer Part NumberSIC417CD-T1-E3
DescriptionIC DRIVER MOSF SYNC BUCK 55MLPQ
ManufacturerVishay
SeriesmicroBUCK™
SIC417CD-T1-E3 datasheets

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Specifications of SIC417CD-T1-E3

TopologyStep-Down (Buck) Synchronous (1), Linear (LDO) (1)FunctionAny Function
Number Of Outputs2Frequency - Switching200kHz ~ 1MHz
Voltage/current - Output 10.5 V ~ 5.5 V, 10AVoltage/current - Output 20.75 V ~ 5.25 V, 150mA
W/led DriverNoW/supervisorNo
W/sequencerNoVoltage - Supply3 V ~ 28 V
Operating Temperature-25°C ~ 125°CMounting Type*
Package / Case*Output Voltage0.5 V to 5.5 V
Output Current10 AInput Voltage3 V to 28 V
Switching Frequency200 KHz to 1 MHzMounting StyleSMD/SMT
Duty Cycle (max)95 %Primary Input Voltage28V
No. Of Outputs1Voltage Regulator Case StyleMLPQ
No. Of Pins32Operating Temperature Range-25°C To +125°C
SvhcNo SVHCRohs CompliantYes
Lead Free Status / RoHS StatusLead free / RoHS Compliant  
show all specifications
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SiC417
Vishay Siliconix
On-Time One-Shot Generator (t
Frequency
The SiC417 have an internal on-time one-shot generator
which is a comparator that has two inputs. The FB
Comparator output goes high when VFB is less than the
internal 500 mV reference. This feeds into the gate drive and
turns on the high-side MOSFET, and also starts the one-shot
timer. The one-shot timer uses an internal comparator and a
capacitor. One comparator input is connected to V
other input is connected to the capacitor. When the on-time
begins, the internal capacitor charges from zero volts
through a current which is proportional to V
capacitor voltage reaches V
, the on-time is completed
OUT
and the high-side MOSFET turns off. The figure 2 shows the
on-chip implementation of on-time generation.
Gate
FB comparator
drives
FB
-
500 mV
+
Q1
Q1
DH
V
V
OUT
One-shot
Q2
V
DL
IN
timer
R
On-time = K x R
x (V
V
)
ton
ton
OUT/
IN
Figure 2 - On-Time Generation
This method automatically produces an on-time that is
proportional to V
and inversely proportional to V
OUT
steady-state conditions, the switching frequency can be
determined from the on-time by the following equation.
V
OUT
f
=
SW
t
x V
ON
IN
The SiC417 uses an external resistor to set the ontime which
indirectly sets the frequency. The on-time can be
programmed to provide operating frequency from 200 kHz to
1 MHz using a resistor between the t
ON
resistor value is selected by the following equation.
(t
- 10 ns) x V
ON
IN
R
=
ton
25 pF x V
OUT
The maximum R
value allowed is shown by the following
TON
equation.
V
IN_MIN
R
=
ton_MAX
15 µA
V
Voltage Selection
OUT
The switcher output voltage is regulated by comparing V
as seen through a resistor divider at the FB pin to the internal
500 mV reference voltage, see figure 3.
www.vishay.com
8
) and Operating
ON
V
OUT
, the
OUT
As the control method regulates the valley of the output ripple
. When the
IN
voltage, the DC output voltage V
ripple according to the following equation.
V
= 0.5 x (1 + R
OUT
Enable and Power-Save Inputs
The EN/PSV and ENL inputs are used to enable or disable
the switching regulator and the LDO.
V
L
OUT
LX
When EN/PSV is low (grounded), the switching regulator is
ESR
off and in its lowest power state. When off, the output of the
FB
switching regulator soft-discharges the output into a 15 Ω
+
C
OUT
internal resistor via the V
When EN/PSV is allowed to float, the pin voltage will fl oat to
1.5 V. The switching regulator turns on with power-save
disabled and all switching is in forced continuous mode.
When EN/PSV is high (above 2.0 V), the switching regulator
turns on with ultra-sonic power-save enabled. The SiC417
ultra-sonic power-save operation maintains a minimum
. Under
IN
switching frequency of 25 kHz, for applications with stringent
audio requirements.
The ENL input is used to control the internal LDO. This input
serves a second function by acting as a V
the switching regulator.
The LDO is off when ENL is low (grounded). When ENL is a
logic high but below the V
then the LDO is on and the switcher is off. When ENL is
above the V
pin and ground. The
switcher is also enabled if the EN/PSV pin is not grounded.
Forced Continuous Mode Operation
The SiC417 operates the switcher in Forced Continuous
Mode (FCM) by floating the EN/PSV pin (see figure 4). In this
mode one of the power MOSFETs is always on, with no
intentional dead time other than to avoid cross-conduction.
This feature results in uniform frequency across the full load
range with the trade-off being poor efficiency at light loads
due to the high-frequency switching of the MOSFETs.
OUT
To FB pin
R
1
R
2
Figure 3 - Output Voltage Selection
is off set by the output
OUT
/R
) + V
/2
1
2
RIPPLE
pin.
OUT
IN UVLO
threshold (2.6 V typical),
IN UVLO
threshold, the LDO is enabled and the
IN UVLO
Document Number: 69062
S10-1367-Rev. D, 14-Jun-10
sensor for

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