MAX8743(2004) 데이터 시트보기 (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

(Circuit of Figure 1, VDD = VCC = 5V, SKIP = AGND, V+ = 15V, TA = -40°C to +85°C, unless otherwise noted.) (Note 5)

PARAMETER

PWM CONTROLLERS

Input Voltage Range

DC Output Voltage, OUT1

DC Output Voltage, OUT2

Output Voltage Adjust Range

Dual-Mode Threshold, Low

Dual-Mode Threshold, High

OUT_ Input Resistance

FB_ Input Bias Current

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+)

Reference Voltage

Reference Load Regulation

Overvoltage Trip Threshold

(Fixed-Threshold Mode)

Output Undervoltage Threshold

Current-Limit Threshold (Fixed)

SYMBOL

CONDITIONS

MIN

V+

VCC/VDD

VOUT1

Battery voltage, V+

VCC, VDD

V+ = 2V to 28V, SKIP = VCC,

ILOAD = 0 to 8A

(Note 2)

VOUT2

V+ = 2V to 28V, SKIP = VCC,

ILOAD = 0 to 4A (Note 2)

OUT1, OUT2

OVP, FB_

FB1 to AGND

FB1 to VCC

FB1 to OUT1

FB2 to AGND

FB2 to OUT2

OVP, ILIM_

ROUT1

ROUT2

IFB

tON1

tON2

tOFF

ICC

IDD

I+

VREF

FB_

VOUT1 = 1.5V

VOUT2 = 2.5V

TON = AGND

V+ = 24V, VOUT1 = 2V TON = REF

(Note 3)

TON = float

TON = VCC

TON = AGND

V+ = 24V, VOUT2 = 2V TON = REF

(Note 3)

TON = float

On-time 2, with

respect to on-time 1

(Note 3)

TON = VCC

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+

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

IREF = 0 to 50µA

OVP = GND, with respect to FB_ regulation

point, no load

UVP = VCC, with respect to FB_ regulation

point, no load

AGND - VCS_, ILIM_ = VCC

2

4.5

1.773

1.477

0.985

2.463

0.985

1.0

0.05

VCC -

1.5

1.9

75

100

-0.1

120

153

217

308

160

205

295

422

125

125

125

125

1.98

112

65

35

TYP

MAX

28

5.5

1.827

1.523

1.015

2.537

1.015

5.5

0.15

VCC -

0.4

2.1

+0.1

153

195

272

390

204

263

371

534

145

145

145

145

500

1500

5

70

2.02

0.01

117

75

65

UNITS

V

V

V

V

V

V

kΩ

µA

ns

ns

%

ns

µA

µA

µA

V

V

%

%

mV

_______________________________________________________________________________________ 5

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