- 7 -`

AUGUST08,2012|DATASHEET| Rev3.1

IR3894

12AHighlyIntegratedSupIRBuck

Single‐InputVoltage,SynchronousBuckRegulator

PD‐97745

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNIT

Zero‐crossingComparatorOffset Vos_zc Note4‐4 0 4 mV

Oscillator

RtVoltage Vrt 1.0  V

FrequencyRange F

 Rt=80.6K 270 300 330

kHzRt=39.2K 540 600 660

Rt=15.0K 1350 1500 1650

RampAmplitude Vramp Vin=6.8V,Vinslewratemax=

1V/µs,Note4

 1.02

Vp‐p

Vin=12V,Vinslewratemax=

1V/µs,Note4

 1.80

Vin=21V,Vinslewratemax=

1V/µs,Note4

 3.15

Vcc=Vin=5V,ForexternalVcc

operation,Note4

 0.75

RampOffset Ramp(os) Note40.16 V

MinPulseWidth Tmin(ctrl) Note460 ns

MaxDutyCycle Dmax Fs=300kHz,PVin=Vin=12V 86  %

FixedOffTime Toff Note4200 250 ns

SyncFrequencyRange Fsync 2701650 kHz

SyncPulseDuration Tsync 100 200 ns

SyncLevelThreshold High  3 

V

Low  0.6

ErrorAmplifier

InputOffsetVoltage Vos_Vref VFb–Vref,Vref=0.5V‐1.5+1.5

%

Vos_Vp VFb–Vp,Vp=0.5V,Vref=0‐1.5+1.5

InputBiasCurrent IFb(E/A) ‐1+1

µA

InputBiasCurrent IVp(E/A) 0+4

SinkCurrent Isink(E/A) 0.4 0.85 1.2 mA

SourceCurrent Isource(E/A) 4 7.5 11 mA

SlewRate SR Note4 7 12 20 V/µs

Gain‐BandwidthProduct GBWP Note4 20 30 40 MHz

DCGain Gain Note4 100 110 120 dB

MaximumoutputVoltage Vmax(E/A) 1.7 2.0 2.3 V

MinimumoutputVoltage Vmin(E/A)   100 mV

CommonModeinputVoltage   01.2 V

ReferenceVoltage

FeedbackVoltage Vfb VrefandVppinfloating0.5 V

Accuracy0°C<Tj< 70°C‐0.5+0.5 %

- 8 -`

AUGUST08,2012|DATASHEET| Rev3.1

IR3894

12AHighlyIntegratedSupIRBuck

Single‐InputVoltage,SynchronousBuckRegulator

PD‐97745

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNIT

‐40°C<Tj<125°C,Note3‐1.0+1.0

VrefMarginingVoltage



Vref_marg 0.41.2 V

SinkCurrent Isink_Vref Vref=0.6V 12.7 16.0 19.3

µA

SourceCurrent Isrc_Vref Vref=0.4V 12.7 16.0 19.3

VrefComparatorThreshold Vref_disable Vrefpinconnectedexternally0.15

V

Vref_enable 0.4 

SoftStart/Stop

SoftStartRampRate Ramp(SS_start) 0.16 0.2 0.24

mV/µs

SoftStartRampRate Ramp(SS_stop) ‐0.24‐0.2‐0.16

S_CtrlThreshold High 2.4 

V

Low   0.6

PowerGood

PGoodTurnonThreshold VPG(on) VsnsRising,0.4V<Vref<1.2V 85 90 95 %Vref

VsnsRising,Vref<0.1V 85 90 95 %Vp

PGoodLowerTurnoffThreshold VPG(lower) VsnsFalling,0.4V<Vref<1.2V80 85 90 %Vref

VsnsFalling,Vref<0.1V 80 85 90 %Vp

PGoodTurnonDelay VPG(on)_Dly VsnsRising,seeVPG(on)1.28 ms

PGoodUpperTurnoffThreshold VPG(upper) VsnsRising,0.4V<Vref<1.2V 115 120125 %Vref

VsnsRising,Vref<0.1V 115 120 125 %Vp

PGoodComparatorDelay VPG(comp)_

Dly

Vsns<VPG(lower)or

Vsns>VPG(upper)

1 2 3.5 µs

PGoodVoltageLow PG(voltage) IPgood



=‐5mA0.5 V

TrackerComparatorUpper

Threshold

VPG(tracker_

upper)

VpRising,Vref<0.1V0.4

V

TrackerComparatorLower

Threshold

VPG(tracker_

lower)

VpFalling,Vref<0.1V0.3

TrackerComparatorDelay Tdelay(tracker) VpRising,Vref<0.1V,see

VPG(tracker_upper)

 1.28 ms

Under‐VoltageLockout

Vcc‐StartThreshold V

_UVLO_ VccRisingTripLevel 4.0 4.2 4.4

V

Vcc‐StopThreshold V

_UVLO_ VccFallingTripLevel 3.7 3.9 4.1

Enable‐Start‐Threshold Enable_UVLO_ Supplyrampingup 1.14 1.2 1.26

V

Enable‐Stop‐Threshold Enable_UVLO_ Supplyrampingdown 0.95 1 1.05

EnableLeakageCurrent Ien Enable=3.3V1 µA

Over‐VoltageProtection

OVPTripThreshold OVP_Vth VsnsRising,0.45V<Vref<1.2V 115 120 125 %Vref

VsnsRising,Vref<0.1V 115 120 125 %Vp

OVPComparatorDelay OVP_Tdly 1 2 3.5 µs

- 9 -`

AUGUST08,2012|DATASHEET| Rev3.1

IR3894

12AHighlyIntegratedSupIRBuck

Single‐InputVoltage,SynchronousBuckRegulator

PD‐97745

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNIT

Over‐CurrentProtection

CurrentLimit I

LIMIT

 Tj=25°C,Vcc=6.4V 13.8 15.6 18.5 A

HiccupBlankingTime Tblk_Hiccup  20.48 ms

Over‐TemperatureProtection

ThermalShutdownThreshold Ttsd Note4  145 

°C

Hysteresis Ttsd_hys Note420



Note3:Coldtemperatureperformanceisguaranteedviacorrelationusingstatisticalqualitycontrol.Nottestedinproduction.

Note4:Guaranteedbydesignbutnottestedinproduction.

Part #	ERJ-3EKF1000V
Description	RES THKFLM 0603 100 OHM 1% 1/10W 100PPM/ C SMD - Cut TR (S
Category	CHIP RESISTOR
Availability	Out of Stock
Qty	0

ERJ-3EKF1000V

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