MAX1545ETL データシートの表示（PDF） - Maxim Integrated

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MAX1545ETL

Dual-Phase, Quick-PWM Controllers for Programmable CPU Core Power Supplies

Maxim Integrated 

Dual-Phase, Quick-PWM Controllers for

Programmable CPU Core Power Supplies

ELECTRICAL CHARACTERISTICS (continued)

(Circuit of Figure 1, V+ = 15V, VCC = VDD = VSHDN = VTON = VSKIP = VS0 = VS1 = VCODE = 5V, VFB = VCMP = VCMN = VCSP = VCSN

= 1.3V, OFS = SUS = GNDS = D0–D4 = GND; TA = 0°C to +85°C, unless otherwise specified. Typical values are at TA = +25°C.)

PARAMETER

SYMBOL

CONDITIONS

MIN TYP MAX UNITS

Output Undervoltage Fault and

Measured from the time when FB reaches

VROK Transition Blanking Time

tBLANK the voltage set by the DAC code; clock

24

Clks

(Note 4)

speed set by RTIME

VROK Startup Delay

Measured from the time when FB first

reaches the voltage set by the DAC code

3

5

7

ms

after startup

VROK Delay

tVROK

FB forced 2% outside the VROK trip

threshold

VROK Output Low Voltage

VROK Leakage Current

ISINK = 3mA

High state, VROK forced to 5.5V

VCC Undervoltage Lockout

Threshold

VUVLO(VCC)

Rising edge, hysteresis = 90mV, PWM

disabled below this level

Thermal-Shutdown Threshold

CURRENT LIMIT AND BALANCE

TSHDN

Hysteresis = 10°C

Current-Limit Threshold Voltage

(Positive, Default)

VLIMIT CMP - CMN, CSP - CSN; ILIM = VCC

Current-Limit Threshold Voltage

(Positive, Adjustable)

Current-Limit Threshold Voltage

(Negative)

VLIMIT

CMP - CMN,

CSP - CSN

VILIM = 0.2V

VILIM = 1.5V

VLIMIT(NEG)

CMP - CMN, CSP - CSN; ILIM = VCC,

SKIP = VCC

Current-Limit Threshold Voltage

(Zero Crossing)

VZERO CMP - CMN, CSP - CSN; SKIP = GND

CMP, CMN, CSP, CSN Input

Ranges

CMP, CMN, CSP, CSN Input

Current

VCSP = VCSN = 0 to 5V

Secondary Driver-Disable

Threshold

VCSP

ILIM Input Current

Current-Limit Default Switchover

Threshold

IILIM

VILIM

VILIM = 0 to 5V

10

µs

0.4

V

1

µA

4.0 4.25 4.4

V

160

°C

28

30

32

mV

8

10

12

mV

73

75

77

-41

-36

-31

mV

1.5

mV

0

2

V

-2

+2

µA

3

VCC - 1

VCC -

0.4

V

0.1

200

nA

3

VCC - 1

VCC -

0.4

V

Current-Balance Offset

Current-Balance

Transconductance

VOS(IBAL)

(VCMP - VCMN) - (VCSP - VCSN); ICCI = 0,

-20mV < (VCMP - VCMN) < 20mV,

1.0V < VCCI < 2.0V

Gm(IBAL)

-2

+2

mV

400

µS

4 _______________________________________________________________________________________

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