L6911B Fast Delivery |IC PHOENIX CO.,LIMITED

L6911B ,5 BIT PROGRAMMABLE POWER SUPPLY CONTROLLER FOR PENTIUM II PROCESSORBLOCK DIAGRAMV 12VCCVin 5VVCC OCSETPGOODBOOTSSMONITOR and UGATEPROTECTIONOVPVo RT PHASE 1.8V to 3.5 ..
L6911C ,5 BIT PROGRAMMABLE STEP DOWN CONTROLLER WITH SYNCHRONOUS RECTIFICATIONAPPLICATIONStriggered to crowbar the input supply in case of hard■ POWER SUPPLY FOR ADVANCED over-v ..
L6911CTR ,5 BIT PROGRAMMABLE STEP DOWN CONTROLLER WITH SYNCHRONOUS RECTIFICATIONL6911C5 BIT PROGRAMMABLE STEP DOWN CONTROLLERWITH SYNCHRONOUS RECTIFICATION■ OPERATING SUPPLY IC VO ..
L6911CTR ,5 BIT PROGRAMMABLE STEP DOWN CONTROLLER WITH SYNCHRONOUS RECTIFICATIONBLOCK DIAGRAMVcc 5 to 12VVin 5V to12VVCC OCSETPGOODBOOTSSMONITOR andUGATEPROTECTIONOVPVoRT PHASE 1. ..
L6911D ,5 BIT PROGRAMMABLE STEP DOWN CONTROLLER WITH SYNCHRONOUS RECTIFICATIONL6911D5 BIT PROGRAMMABLE STEP DOWN CONTROLLERWITH SYNCHRONOUS RECTIFICATION■ OPERATING SUPPLY IC VO ..
L6911DTR ,5 BIT PROGRAMMABLE STEP DOWN CONTROLLER WITH SYNCHRONOUS RECTIFICATIONAPPLICATIONStriggered to crowbar the input supply in case of hard■ POWER SUPPLY FOR ADVANCED over-v ..
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L6911B
5 BIT PROGRAMMABLE POWER SUPPLY CONTROLLER FOR PENTIUM II PROCESSOR
OPERATING SUPPLY VOLTAGE FROM 5V 12V
TTL-COMPATIBLE 5BIT PROGRAMMABLE
OUTPUT FROM:
-1.3V TO 2.05V WITH 0.05V BINARYSTEPS
-2.1V TO 3.5V WITH 0.1V BINARYSTEPS
VOLTAGE MODE PWM CONTROL
EXCELLENT OUTPUT ACCURACY +/-1%
OVERLINE,AND TEMPERATURE VARIATIONS
HIGH PRECISION INTERNAL REFERENCE
DIGITALLY TRIMMED
VERY FAST LOAD TRANSIENT 0% TO100%
DUTY CYCLE
POWERGOOD OUTPUT
OVERVOLTAGE PROTECTION
OVERCURRENT PROTECTION REALISED
USING THE MOSFET’s RDSon
OPERATING FREQUENCY FROM 50KHz TO
1MHz
MEETS INTEL PENTIUMII SPECIFICATION
DISABLE FUNCTION
Applications
POWER SUPPLY FOR ADVANCED MICRO-
PROCESSOR SUPPLIES
POWER SUPPLY FOR PENTIUMII INTEL
PROCESSORS
DESCRIPTION
The L6911Bisa power supply controller specifi-
cally designedto providea high performance
DC/DC conversion for PentiumII Microproces-
sors.A precise5 bit digitalto analog converter
April 1999
PGND
PHASE
GND
VFB
LGATE
BOOT
UGATEVCC
OCSETCC 5V/12V 2
Vin 5V/12V
Vo
1.3Vto 3.5V 1
PGOOD 12
VD0
VD1
VD2
VD3
VD4
COMP
VSENSS
OVP
OSC
D98IN956B
APPLICATION CIRCUIT
SO20
L6911B BIT PROGRAMMABLE POWER SUPPLY
CONTROLLER FOR PENTIUMII PROCESSOR
1/7
(DAC) allowsto adjust the output voltage from
1.3Vto 2.05V with 0.05V binary steps and from
2.1Vto 3.5V with 0.1V binary steps. The high pre-
cision internal reference, digitally trimmed, as-
sures the selected output voltageto within +/-1%.
Thanksto the window comparator system, the de-
vice provides excellent load transient perform-
ance. The high peak current gate drive affordsto
have fast switchingto the external power mos,
performing an high efficiency. The L6911B as-
suresa fast protection against load overvoltage
and load overcurrent. An external SCRis trig-
geredto crowbarthe input supplyin caseof over-
voltage.In caseof output short circuit the soft
start capacitoris discharged and the system
worksin hiccup mode.
ABSOLUTEMAXIMUM RATINGS
Symbol Parameter Value Unit
VCC VCCto PGND 15 V
VBOOT-VPHASE Boot Voltage 15 V
Input, OutputorI/O Voltage -0.3to VCC+0.3 V
THERMAL DATA
Symbol Parameter Value Unit
Rthj-amb Thermal Resistance Junction toAmbient 110 °C/W
Tmax Maximum Junction Temperature 150 °C
Tstg Storage Temperature Range -65to 150 °C
RECOMMENDED OPERATING CONDITION
Symbol Parameter Value Unit
VCC VCCto PGND 5V ±10%/12V ±10% V
Tamb Ambient Temperature Range 0to70 °C Junction Temperature Range 0to 125 °C
DESCRIPTION (continued)
PGND
PHASE
GND
VFB
LGATE
BOOT
UGATE
VCC OCSET
VCC12V
Vin5V
Vo
1.8Vto3.5V
PGOOD
COMP
VSEN
OVP
VD0
VD1
VD2
VD3
VD4
MONITORand
PROTECTION
OSC
D/A
E/A
PWM+
D98IN957A
BLOCK DIAGRAM
L6911B
2/7
PIN FUNCTIONS Name Description VSEN Connected tothe output voltageis ableto manage overvoltage conditions andthe PGOOD
signal. OCSET A resistor connected from thispin andthe upper Mos Drain sets the current limit protection.
The internal 200μA current generator sinksa current from the drain throughthe external
resistor. The overcurrent thresholdis duetothe following equation:= Iocs⋅ Rocs
Rdson SS The soft starttimeis programmed connectingan external capacitor from thispin and GND.
The internal current generator forces through the capacitor 10μA. Thispin canbe usedto
disable the device forcinga voltage lower than 0.4V.-8 VID0-4 Voltage Identification code pins. These input are open collector and TTL compatible. Are used programthe output voltageas specifiedin Table1 andtosetthe overvoltage and
powergood thresholds. COMP Thispinis connectedtothe error amplifier output andis usedto compensate the voltage
control feedback loop. FB Thispinis connectedtothe error amplifier inverting input andis usedto compensatethe
voltage control feedback loop. GND All internal voltage reference are referredto this pin. PGOOD Thispinisan open collector output andis pulled lowif the output voltageis not within ±10% the programmed voltage. Thispinis forced highifthe ”11111” VIDis set. PHASE Thispinis connectedtothe sourceofthe upper mosfet and providesthe return pathfor the
high side driver. This pin monitors the drop acrossthe upper mosfetforthe current limit. UGATE High side gate driveroutput. BOOT Bootstrap capacitor pin. Through thispinis suppliedthe high side driver andthe upper mosfet. PGND Power ground pin. Thispin has tobe connected closelytothe low side mosfet sourcein order reducethe noise injection intothe device. LGATE Thispinis the lower mosfet gate driver output. VCC Device supply voltage. The operative supply voltage rangeis 4.5Vto 12V.not connect VINto 12Vif VCCis 5V. OVP Over voltage protection.Ifthe output voltage reach the 15% abovethe programmed voltage
thispinis driven high and canbe usedto drivean externalSCR that crowbarthe supply
voltage.
VSEN
OCSET
VID0
VID1
VID3
VID2
VID4
COMP PGOOD
PHASE
UGATE
PGND
BOOT
LGATE
VCC
OVP1 GND
D98IN958
PIN CONNECTION
L6911B
3/7
ELECTRICAL CHARACTERISTICS
Symbol Parameter Test Condition Min. Typ. Max. Unit
VCC SUPPLY CURRENT
ICC Supply current UGATE and LGATE open - 5 - mA
POWER-ON
Rising VCC Threshold VOCSET= 4.5V - - 4.6 V
Falling VCC Threshold VOCSET= 4.5V 3.6 - - V
Rising VOCSET Threshold - 1.26 - V
OSCILLATOR
Free Running Frequency RT= open 185 200 215 kHz
Total Variation RTto GND >6kΩ,to VCC= 12V> 200kΩ
-15 - 15 %
ΔVosc Ramp Amplitude RT= open - 1.9 - V
REFERENCE and DAC
DACOUT voltage Accuracy VID0, VID1, VID2, VID3 see
Table1 - 1 %
ERROR AMPLIFIER Gain - 88 - dB
GBW Gain-Bandwidth Product - 15 - MHz Slew Rate COMP= 10pF - 10 - V/μs
GATE DRIVERS
IUGATE Upper Gate Source VBOOT- Vphase= 12V,
VUGATE =6V
0.6 1 - A
RUGATE Upper Gate Sink ILGATE= 0.3A - 1.5 3 Ω
ILGATE Lower Gate Source VCC= 12V, VLGATE=6V 1.2 2 - A
RLGATE Lower Gate Sink ILGATE= 0.3A - 1 2 Ω
PROTECTION
Overvoltage Trip
(VSEN/DACOUT) 115 120 %
IOCSET OCSET Current Source VOCSET= 4.5VDC 170 200 230 μA
IOVP OVP Sourcing Current VSEN= 5.5V, VOVP =0V 60 mA
ISS Soft Start Current 10 μA Name Description RT Oscillator Switching frequency pin. Connecting anexternal resistor from thispinto groundthe
switching frequencyis increased accordingtothe equation:= 200kHz+5⋅106
RT(KΩ)
Connectingthe resistor from thispin andthe Vccthe Switching frequencyis reduced
accordingtothe equation:= 200kHz−4⋅107
RT(KΩ)thepinisnot connected the switching frequencyis 200kHz.
PIN FUNCTION (continued)
L6911B
4/7
Symbol Parameter Test Condition Min. Typ. Max. Unit
Upper Threshold
(VSEN/DACOUT)
VSEN Rising 106 - 111 %
Upper Threshold
(VSEN/DACOUT)
VSEN Rising 89 - 94 %
Hysteresis
(VSEN/DACOUT)
Upper and Lower Threshold - 2 - %
VPGOOD PGOOD Voltage Low IPGOOD= -5mA - 0.5 - V
ELECTRICAL CHARACTERISTICS (continued)
Table1.
VID4 VID3 VID2 VID1 VID0 OUTPUT VOLTAGE(V) 111 1.3 1 1 1 0 1.35 101 1.4 1 1 0 0 1.45 011 1.5 1 0 1 0 1.55 001 1.6 1 0 0 0 1.65 111 1.7 0 1 1 0 1.75 101 1.8 0 1 0 0 1.85 011 1.9 0 0 1 0 1.95 001 2 0 0 0 0 2.05 111 0 110 2.1 101 2.2 100 2.3 011 2.4 010 2.5 001 2.6 000 2.7 111 2.8 110 2.9 101 3 100 3.1 011 3.2 010 3.3 001 3.4 000 3.5
L6911B
5/7
020B CSO20MEC 45°
SO20
DIM. inch
MIN. TYP. MAX. MIN. TYP. MAX. 2.35 2.65 0.093 0.104 0.1 0.3 0.004 0.012 0.33 0.51 0.013 0.020 0.23 0.32 0.009 0.013 12.6 13 0.496 0.512 7.4 7.6 0.291 0.299 1.27 0.050 10 10.65 0.394 0.419 0.25 0.75 0.010 0.030 0.4 1.27 0.016 0.050
K0°(min.)8° (max.)
OUTLINE AND
MECHANICAL DATA
L6911B
6/7

Partno	Mfg	Dc	Qty	Available	Descript
L6911B	ST	N/a	1000	avai	5 BIT PROGRAMMABLE POWER SUPPLY CONTROLLER FOR PENTIUM II PROCESSOR