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MAX1638EAG

High-Speed Step-Down Controller with Synchronous Rectification for CPU Power

Maxim Integrated 

High-Speed Step-Down Controller with

Synchronous Rectification for CPU Power

ELECTRICAL CHARACTERISTICS (continued)

(VDD = VCC = D4 = +5V, PGND = AGND = D0–D3 = 0V, FREQ = REF, TA = 0°C to +85°C, unless otherwise noted.)

PARAMETER

Maximum Duty Cycle

LG, FREQ Input Voltage

Logic Input Voltage Low

Logic Input Voltage High

D0–D4 Source Current

LG, FREQ Input Current

CSH, CSL Input Current

FB Input Current

CC1 Output Resistance

CC2 Transconductance

CC2 Clamp Voltage

CC2 Source/Sink Current

DH On-Resistance

DL On-Resistance

DH, DL Source/Sink Current

DH, DL Dead Time

PDRV Trip Level

NDRV Trip Level

PDRV, NDRV Response Time

PDRV, NDRV On-Resistance

PDRV, NDRV Source/Sink Current

PDRV, NDRV Minimum On-Time

Current-Limit Trip Voltage

Soft-Start Time

BST Leakage Current

CONDITIONS

FREQ = VCC

GND (low)

REF (mid)

VCC (high)

D0–D4, VCC = 4.5V

D0–D4, VCC = 5.5V

D0–D4 = 0V

CSH = CSL = 1.3V, D0–D3 = 5V, D4 = 0V

Minimum

Maximum

100mV overdrive

BST - LX = 4.5V

VDD = 4.5V

DH = DL = 2.5V

With respect to VREF,

FB going low

With respect to VREF,

FB going high

FB overdrive = 5%

VDD = 4.5V

PDRV = NDRV = 2.5V

TA = +25°C

TA = 0°C to +85°C

TA = +25°C

TA = 0°C to +85°C

FB = 3.5V

FB = 0V (Foldback)

To full current limit

BST = 12V, LX = 7V, REF = GND

MIN TYP

85

90

3.3

VCC - 0.1

2.0

2

5

2.4

4

0

-2.75

-3

1.25

1

85

15

10

1

100

0.7

0.7

2

30

-2

2

75

2

0.5

100

100

38

1536

MAX

0.2

3.7

0.8

10

4

50

±0.1

3.0

VCC

2

2

-1.25

-1

2.75

3

5

115

70

50

UNITS

%

V

V

V

µA

µA

µA

µA

kΩ

mmho

V

µA

Ω

Ω

A

ns

%

%

ns

Ω

A

ns

mV

1 / fOSC

µA

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