Low-Noise, 14V Input, 1A, PWM

Step-Down Converters

2

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ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional

operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to

absolute maximum rating conditions for extended periods may affect device reliability.

AIN to AGND ............................................................-0.3 to +15V

PGND to AGND ..................................................................±0.3V

CVH to IN..................................................................-6V to +0.3V

CVL, STBY, SYNC/PWM to AGND............................-0.3V to +6V

Reference Current ..............................................................±1mA

CVL Current ..........................................................10mA to -1mA

LX Peak Current (Internally Limited) .....................................2.3A

16-Pin QSOP (derate 8.3mW/°C above +70°C)............667mW

Operating Temperature Range ...........................-40°C to +85°C

Junction Temperature ......................................................+150°C

Storage Temperature Range .............................-65°C to +150°C

Lead Temperature (soldering, 10sec ) ............................+300°C

Low-power mode, STBY = low,

Normal mode, SYNC/PWM = low,

PWM mode,

SYNC/PWM = high,

(Note 2)

SYNC/PWM = high

High-side switch,

BOOT = AGND (Note 1)

SYNC/PWM = low

CONDITIONS

0.14

0.27

Quiescent Power Consumption

0.9

2

25

65

mW

13

33

mA

40

80

120

Zero Crossing Threshold

20

50

80

V

Feedback Voltage

1.238

1.251

1.264

V

2.7

14

Input Voltage Range

A

0.15

0.4

0.9

Current Limit, N-Channel

A

1.2

1.75

2.3

Current Limit in PWM Mode

Ω

38

On-Resistance, N-Channel

0.24

0.5

%

0.01

Output Load Regulation

A

1

Output Current Capability

V

Output Adjust Range

nA

-50

50

FB Input Current

UNITS

MIN

TYP

MAX

SYMBOL

PARAMETER

V

Output Voltage (3.3V mode)

3.3

3.333

3.365

Ω

0.34

0.8

On-Resistance, P-Channel

MAX1684

MAX1685

MAX1684

MAX1685

SYNC/PWM = low

mA

285

380

475

Pulse-Skipping Current Threshold

STBY = low

mA

285

380

475

Current Limit in Low-Power

Mode