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LX2172CM

1.25A HIGH-EFFICIENCY 100KHZ SWITCHING REGULATOR

Microsemi Corporation 

PRODUCT DATABOOK 1996/1997

1.25A HIGH-EFFICIENCY 100KHZ SWITCHING REGULATOR

PR E L I M I N A RY D ATA S H E E T

LX2172/73

ELECTRICAL CHARACTERISTICS

(Unless otherwise specified, these specifications apply over the ranges TA = 0 to 70ºC for the LX217xC. VIN = VC = 5V. All devices must be functional over

junction temperature of -65°C to 150°C. Typ. number represents TA = 25ºC value.)

Parameter

Symbol

Test Conditions

LX2172 / 2173

Units

Min. Typ. Max.

Reference Section

Initial Accuracy

VREF

TJ = 25ºC, Measured at FB pin

Over Temperature, Measured at FB pin

1.224 1.244 1.264 V

1.214 1.244 1.274 V

Line Regulation

Oscillator Section

3V < VCC < 25V

0.03

%/V

Switching Frequency

f

TA = 25ºC

Over Temperature

90 100 110 kHz

85 100 115 kHz

Line Voltage Stability

Error Amplifier Section

VIN = 3V to 25V

±5

%

Input Bias Current

IB

TJ = 25ºC; VFB = VREF

Over Temperature

350 750 nA

1100 nA

Open Loop Gain

Transconductance

AVOL

gm TJ = 25ºC; VFB = VREF; ∆I = ±25µA

Over Temperature

3000

2400

500

4400

1000

6000

7000

V/V

µMHO

µMHO

Output Sink Current

Output Source Current

Output HI Voltage

Output LO Voltage

Slew Rate

IEA (SINK)

IEA (SOURCE)

VCOMP-HI

VCOMP-LO

S

VFB = 1V

VFB = 1.5V

120 200

µA

120

µA

1.8 2.1 2.3

V

0.2

0.3 0.52

V

2

V/µsec

C.S. Comparator Section

C.S. Delay to Driver Output

10% Over drive GBNT

100

ns

VC to Output Transconductance

PWM Section

2

A/V

E.A. Output to PWM Drive Offset (VPWM)

Minimum Duty Cycle

VOFS Duty Cycle = 0

0.6

1.2 1.25

V

36

40

%

Maximum Duty Cycle

80

90

98

%

Output Drive Section

Output Switch Breakdown Voltage

Output Switch On Resistance

Switch Current Limit

ISW = 1.5mA

RON IO = 2A

D.C = 50%

ILIM 50% < D.C < 80%

65

V

0.4 0.6

Ω

1.25 1.7 2.8

A

1.0 1.5 2.0

A

Total Switching Loss (On Time + Off Time)

Input Supply Section

VIN = 25V, D.C = 50%, IO = 1A, VSW = 60V

100

mW

Start-Up Threshold

2.2 2.7 2.9

V

Normal Mode Quiescent Current

VC Shutdown Threshold

Sleep Mode Current

IQ ENABLE = HI, VC = 0.6V, IO = 0A

3V < VIN < VMAX , TJ = 25°C

3V < VIN < VMAX , Over Temperature

ENABLE = HI, VC = 50mV

ENABLE = LO (LX2173 only)

5

8

mA

100 150 260 mV

50

300 mV

100

µA

5

µA

Copyright © 1998

Rev. 0.4a 12/04

3

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