MC33167 datasheet(3/20 Pages) ONSEMI

Part #	MC33167

Description	5.0 A, Step?뭊p/Down/Inverting Switching Regulators

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MC34167, MC33167

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ELECTRICAL CHARACTERISTICS (VCC = 12 V, for typical values TA = +25°C, for min/max values TA is the operating ambient

temperature range that applies (Notes 4, 5), unless otherwise noted.)

Characteristic

Symbol

Min

Typ

Max

Unit

OSCILLATOR

Frequency (VCC = 7.5 V to 40 V)

TA = +25°C

TA = Tlow to Thigh

fOSC

65

62

72

−

79

81

kHz

ERROR AMPLIFIER

Voltage Feedback Input Threshold

TA =+ 25°C

TA = Tlow to Thigh

VFB(th)

4.95

4.85

5.05

−

5.15

5.20

V

Line Regulation (VCC = 7.5 V to 40 V, TA = +25°C)

Regline

−

0.03

0.078

%/V

Input Bias Current (VFB = VFB(th) + 0.15 V)

IIB

−

0.15

1.0

mA

Power Supply Rejection Ratio (VCC = 10 V to 20 V, f = 120 Hz)

PSRR

60

80

−

dB

Output Voltage Swing

High State (ISource = 75 mA, VFB = 4.5 V)

Low State (ISink = 0.4 mA, VFB = 5.5 V)

VOH

VOL

4.2

−

4.9

1.6

−

1.9

V

PWM COMPARATOR

Duty Cycle (VCC = 20 V)

Maximum (VFB = 0 V)

Minimum (VComp = 1.9 V)

DC(max)

DC(min)

92

0

95

0

100

0

%

SWITCH OUTPUT

Output Voltage Source Saturation (VCC = 7.5 V, ISource = 5.0 A)

Vsat

−

(VCC −1.5)

(VCC −1.8)

V

Off−State Leakage (VCC = 40 V, Pin 2 = GND)

Isw(off)

−

0

100

mA

Current Limit Threshold (VCC = 7.5 V)

Ipk(switch)

5.5

6.5

8.0

A

Switching Times (VCC = 40 V, Ipk = 5.0 A, L = 225 mH, TA = +25°C)

Output Voltage Rise Time

Output Voltage Fall Time

tr

tf

−

100

50

200

100

ns

UNDERVOLTAGE LOCKOUT

Startup Threshold (VCC Increasing, TA = +25°C)

Vth(UVLO)

5.5

5.9

6.3

V

Hysteresis (VCC Decreasing, TA = +25°C)

VH(UVLO)

0.6

0.9

1.2

V

TOTAL DEVICE

Power Supply Current (TA = +25°C )

Standby (VCC = 12 V, VComp < 0.15 V)

Operating (VCC = 40 V, Pin 1 = GND for maximum duty cycle)

ICC

−

36

40

100

60

mA

4. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient as possible.

5. Tlow =0°C for MC34167

Thigh = + 70°C for MC34167

=− 40

°C for MC33167

= + 85

°C for MC33167

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