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IR3856WMPBF 데이터시트 PDF




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부품번호 IR3856WMPBF 기능
기능 SYNCHRONOUS BUCK REGULATOR
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IR3856WMPBF 데이터시트, 핀배열, 회로
PD-97506
IR3856WMPbF
SupIRBuckTM
HIGHLY EFFICIENT
INTEGRATED 6A, SYNCHRONOUS BUCK REGULATOR
Features
Greater than 95% Maximum Efficiency
Wide Input Voltage Range 1.5V to 16V
Wide Output Voltage Range 0.7V to 0.9*Vin
Continuous 6A Load Capability
Integrated Bootstrap-diode
High Bandwidth E/A for excellent transient
performance
Programmable Switching Frequency up to 1.5MHz
Programmable Over Current Protection
PGood output
Hiccup Current Limit
Precision Reference Voltage (0.7V, +/-1%)
Programmable Soft-Start
Enable Input with Voltage Monitoring Capability
Enhanced Pre-Bias Start-up
Seq input for Tracking applications
-40oC to 125oC operating junction temperature
Thermal Protection
4mm x 5mm Power QFN Package
Halogen Free, Lead Free and RoHS compliant
Applications
Server Applications
Storage Applications
Embedded Telecom Systems
Distributed Point of Load Power Architectures
Description
The IR3856W SupIRBuckTM is an easy-to-use,
fully integrated and highly efficient DC/DC
synchronous Buck regulator. The MOSFETs co-
packaged with the on-chip PWM controller make
IR3856W a space-efficient solution, providing
accurate power delivery for low output voltage
applications.
IR3856W is a versatile regulator which offers
programmability of start up time, switching
frequency and current limit while operating in
wide input and output voltage range.
The switching frequency is programmable from
250kHz to 1.5MHz for an optimum solution.
It also features important protection functions,
such as Pre-Bias startup, hiccup current limit and
thermal shutdown to give required system level
security in the event of fault conditions.
Netcom Applications
Computing Peripheral Voltage Regulators
General DC-DC Converters
Rev 9.0
Fig. 1. Typical application diagram
1
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IR3856WMPBF pdf, 반도체, 판매, 대치품
PD-97506
IR3856WMPbF
Pin Description
Pin Name
1 Fb
2 NC
Description
Inverting input to the error amplifier. This pin is connected directly to the
output of the regulator via resistor divider to set the output voltage and
provide feedback to the error amplifier.
No connect
3 Comp Output of error amplifier. An external resistor and capacitor network is
typically connected from this pin to Fb pin to provide loop
compensation.
4 Gnd Signal ground for internal reference and control circuitry.
5 Rt Set the switching frequency. Connect an external resistor from this pin
to Gnd to set the switching frequency.
6 SS/SD Soft start / shutdown. This pin provides user programmable soft-start
function. Connect an external capacitor from this pin to Gnd to set the
start up time of the output voltage. The converter can be shutdown by
pulling this pin below 0.3V.
7 OCSet Current limit set point. A resistor from this pin to SW pin will set the
current limit threshold.
8 PGood Power Good status pin. Output is open drain. Connect a pull up resistor
from this pin to Vcc.
9
VCC
This pin powers the internal IC. A minimum of 1uF high frequency
capacitor must be connected from this pin to Analog ground (AGnd).
10 PVcc This pin powers the drivers. A minimum of 1uF high frequency capacitor
must be connected from this pin to the power ground (PGnd).
11 PGnd Power Ground. This pin serves as a separated ground for the MOSFET
drivers and should be connected to the system’s power ground plane.
12 SW Switch node. This pin is connected to the output inductor.
13 VIN Input voltage connection pin.
14 Boot Supply voltage for high side driver. A 0.1uF capacitor must be
connected from this pin to SW.
15 Enable Enable pin to turn on and off the device. Use two external resistors to
set the turn on threshold (see Enable section). Connect this pin to Vcc if
it is not used.
16 Seq Sequence pin. Use two external resistors to set Simultaneous Power up
sequencing. If this pin is not used connect to Vcc.
17 Gnd Signal ground for internal reference and control circuitry.
Rev 9.0
4
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IR3856WMPBF 전자부품, 판매, 대치품
PD-97506
IR3856WMPbF
Electrical Specifications
Unless otherwise specified, these specifications apply over 4.5V< PVcc=Vcc<5.5V, Vin=12V
0oC<Tj< 125oC. Typical values are specified at Ta = 25oC.
Parameter
SYM
Test Condition
Min TYP MAX
Thermal Shutdown
Thermal Shutdown
Note4
140
Hysteresis
Note4
20
Units
oC
Power Good
Power Good upper
Threshold
Upper Threshold
Delay
Power Good lower
Threshold
Lower Threshold
Delay
Delay Comparator
Threshold
Delay Comparator
Hysteresis
PGood Voltage Low
Leakage Current
Switch Node
SW Bias Current
VPG(upper)
VPG(upper)_Dly
VPG(lower)
VPG(lower)_Dly
PG(Delay)
Delay(hys)
PG(voltage)
Ileakage
Fb Rising
Fb Rising
Fb Falling
Fb Falling
Relative to charge voltage, SS rising
Note4
IPGood=-5mA
0.770
0.560
2
260
SW=0V, Enable=0V
Isw
SW=0V,Enable=high,SS=3V,Vseq=0V
, Note4
0.810
256/Fs
0.6
256/Fs
2.1
300
0
0.840
0.630
2.3
340
0.5
10
6
V
s
V
s
V
mV
V
μA
μA
Note3: Cold temperature performance is guaranteed via correlation using statistical quality control. Not tested in production.
Note4: Guaranteed by Design but not tested in production.
Note5: Upgrade to industrial/MSL2 level applies from date codes 1227 (marking explained on application note AN1132 page 2).
Products with prior date code of 1227 are qualified with MSL3 for Consumer market.
Rev 9.0
7
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IR3856WMPBF

SYNCHRONOUS BUCK REGULATOR

International Rectifier
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