MAX17021 datasheet(5/48 Pages) MAXIM

5 / 48 page

Dual-Phase, Quick-PWM Controllers for

IMVP-6+/IMVP-6.5 CPU Core Power Supplies

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ELECTRICAL CHARACTERISTICS (continued)

(Circuit of Figure 1, VIN = 10V, VCC = VDD = VSHDN = VPGDIN = VPSI = VILIM = 5V, V3P3 = 3.3V, DPRSLPVR = GNDS = GND, VCSP1

= VCSN1 = VCSP2 = VCSN1 = 1.0000V, FB = FBAC, RFBAC = 3.57kΩ from FBAC to CSN1, D6–D0 = [0101000]; MAX17082/MAX17482:

VSLOW = 5V; MAX17021: DPRSTP = GND; TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

CLKEN, PWRGD, and

PHASEGD Transition

Blanking Time

(VID Transitions)

tBLANK

Measured from the time when FB reaches the

target voltage (Note 2)

μs

PHASEGD Transition

Blanking Time (Phase 2

Enable Transitions)

Number of DH2 pulses for which PHASEGD is

blanked after phase 2 is enabled

Pulses

CLKEN Output Low Voltage

Low state, ISINK = 3mA

0.4

CLKEN Output High

Voltage

High state, ISOURCE = 3mA

V3P3 -

0.4

PWRGD, PHASEGD Output

Low Voltage

Low state, ISINK = 3mA

0.4

PWRGD, PHASEGD

Leakage Current

High-impedance state, PWRGD, PHASEGD forced

to 5V, TA = +25°C

μA

CSN1 Pulldown Resistance

in Shutdown

SHDN = 0, measured after soft-shutdown

completed (DL_ = low)

VCC Undervoltage Lockout

(UVLO) Threshold

VUVLO(VCC)

Rising edge, 65mV typical hysteresis,

controller disabled below this level

4.05

4.27

4.48

THERMAL PROTECTION

VRHOT Trip Threshold

Measured at THRM as a percentage of VCC,

falling edge, typical hysteresis = 75mV

VRHOT Delay

tVRHOT

THRM forced 25mV below the

VRHOT trip

threshold, falling edge

μs

VRHOT Output

On-Resistance

RON(VRHOT) Low state

VRHOT Leakage Current

High-impedance state,

VRHOT forced to 5V,

TA = +25°C

μA

THRM Input Leakage

ITHRM

VTHRM = 0 to 5V, TA = +25°C

-0.1

+0.1

μA

Thermal-Shutdown Threshold

TSHDN

Typical hysteresis = 15°C

160

°C

VALLEY CURRENT LIMIT, DROOP, AND CURRENT BALANCE

VTIME - VILIM = 100mV

VTIME - VILIM = 500mV

Current-Limit Threshold

Voltage (Positive)

VLIMIT

VCSP_ - VCSN_

ILIM = VCC

22.5

Current-Limit Threshold

Voltage (Negative)

Accuracy

VLIMIT(NEG) VCSP_ - VCSN_, nominally -125% of VLIMIT

-4

Current-Limit Threshold

Voltage (Zero Crossing)

VZERO

VGND - VLX_, DPRSLPVR = 5V

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