MAX8743(2004) Просмотр технического описания (PDF) - Maxim Integrated

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MAX8743
(Rev.:2004)

Dual, High-Efficiency, Step-Down Controller with High Impedance in Shutdown

Maxim Integrated 

Dual, High-Efficiency, Step-Down

Controller with High Impedance in Shutdown

ELECTRICAL CHARACTERISTICS (continued)

(Circuit of Figure 1, VDD = VCC = 5V, SKIP = AGND, V+ = 15V, TA = 0°C to +85°C, typical values are at +25°C, unless otherwise

noted.)

PARAMETER

On-Time, Side 1

On-Time, Side 2

On-Time Tracking

Minimum Off-Time

Quiescent Supply Current (VCC)

Quiescent Supply Current (VDD)

Quiescent Supply Current (V+)

Shutdown Supply Current (VCC)

Shutdown Supply Current (VDD)

Shutdown Supply Current (V+)

Reference Voltage

Reference Load Regulation

REF Sink Current

REF Fault Lockout Voltage

Overvoltage Trip Threshold

(Fixed-Threshold Mode)

SYMBOL

CONDITIONS

tON1

tON2

tOFF

ICC

IDD

I+

V+ = 24V,

VOUT1 = 2V

(Note 3)

V+ = 24V,

VOUT2 = 2V

(Note 3)

TON = AGND

TON = REF

TON = float

TON = VCC

TON = AGND

TON = REF

TON = float

TON = VCC

On-time 2 with

respect to on-

time 1

(Note 3)

TON = AGND

TON = REF

TON = float

TON = VCC

(Note 3)

FB_ forced above the regulation point

FB_ forced above the regulation point

Measured at V+

ON1 = ON2 = AGND, OVP = VCC

ON1 = ON2 = AGND

ON1 = ON2 = AGND, measured at V+,

VCC = AGND or 5V

VREF

VCC = 4.5V to 5.5V, no external REF load

IREF = 0 to 50µA

REF in regulation

Falling edge, hysteresis = 40mV

OVP = AGND, with respect to error-

comparator trip threshold

MIN TYP MAX UNITS

120

137

153

153

174

195

ns

222

247

272

316

353

390

160

182

204

205

234

263

ns

301

336

371

432

483

534

125

135

145

125

135

145

%

125

135

145

125

135

145

400 500

ns

1100 1500 µA

<1

5

µA

25

70

µA

<1

5

µA

<1

5

µA

<1

5

µA

1.98

2

2.02

V

0.01

V

10

µA

1.6

V

112

114

117

%

Overvoltage Comparator Offset

(Adjustable-Threshold Mode)

1V < VOVP < 1.8V, external feedback,

measured at FB_ with respect to VOVP

1V < VOVP < 1.8V, internal feedback,

measured at OUT_ with respect to OUT_

regulation point

-28

0

+28

mV

-3.5

0

+3.5

%

OVP Input Leakage Current

Overvoltage Fault Propagation

Delay

1V < VOVP < 1.8V

FB_ forced 2% above trip threshold

-100

<1 +100 nA

1.5

µs

Output Undervoltage Threshold

UVP = VCC, with respect to error-comparator

trip threshold

65

70

75

%

Output Undervoltage Protection

Blanking Time

From ON_ signal going high

10

30

ms

_______________________________________________________________________________________ 3

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