MAX1999 datasheet(3/32 Pages) MAXIM

Part #	MAX1999

Description	High-Efficiency, Quad Output, Main Power- Supply Controllers for Notebook Computers

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Manufacturer	MAXIM [Maxim Integrated Products]

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High-Efficiency, Quad Output, Main Power-

Supply Controllers for Notebook Computers

_______________________________________________________________________________________

3

ELECTRICAL CHARACTERISTICS (continued)

(Circuit of Figure 1 and Figure 2, no load on LDO5, LDO3, OUT3, OUT5, and REF, V+ = 12V, ON3 = ON5 = VCC, V SHDN = 5V,

TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.)

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

5V SMPS

200

MAX1777 or MAX1999

(VTON = 5V), SKIP = VCC

3.3V SMPS

300

5V SMPS

400

MAX1977 or MAX1999

(VTON = 0), SKIP = VCC

3.3V SMPS

500

Operating Frequency

SKIP = REF

25

36

kHz

VOUT5 = 5.05V

1.895

2.105

2.315

MAX1777 or MAX1999

(VTON = 5V)

VOUT3 = 3.33V

0.833

0.925

1.017

VOUT5 = 5.05V

0.895

1.052

1.209

On-Time Pulse Width

MAX1977 or MAX1999

(VTON = 0)

VOUT3 = 3.33V

0.475

0.555

0.635

µs

Minimum Off-Time

250

300

350

ns

VOUT5 = 5.05V

94

MAX1777 or MAX1999

(VTON = 5V)

VOUT3 = 3.33V

91

VOUT5 = 5.05V

88

Maximum Duty Cycle

MAX1977 or MAX1999

(VTON = 0)

VOUT3 = 3.33V

85

%

INTERNAL REGULATOR AND REFERENCE

LDO5 Output Voltage

ON3 = ON5 = GND, 6V < V+ < 24V, 0 < ILDO5 < 100mA

4.90

5.00

5.10

V

LDO5 Short-Circuit Current

LDO5 = GND

190

mA

LDO5 Undervoltage Lockout

Fault Threshold

Falling edge of LDO5, hysteresis = 1%

3.7

4.0

4.3

V

LDO5 Bootstrap Switch Threshold

Falling edge of OUT5, rising edge at OUT5 regulation

point

4.43

4.56

4.69

V

LDO5 Bootstrap

Switch Resistance

LDO5 to OUT5, VOUT5 = 5V

1.4

3.2

Ω

LDO3 Output Voltage

ON3 = ON5 = GND, 6V < V+ < 24V, 0 < ILDO3 < 100mA

3.28

3.35

3.42

V

LDO3 Short-Circuit Current

LDO3 = GND

180

mA

LDO3 Bootstrap Switch Threshold

Falling edge of OUT3, rising edge at OUT3 regulation

point

2.80

2.91

3.02

V

LDO3 Bootstrap Switch

Resistance

LDO3 to OUT3, VOUT3 = 3.2V

1.5

3.5

Ω

REF Output Voltage

No external load

1.980

2.000

2.020

V

REF Load Regulation

0 < ILOAD < 50µA

10

mV

REF Sink Current

REF in regulation

10

µA

V+ Operating Supply Current

LDO5 switched over to OUT5, 5V SMPS

25

50

µA

V+ Standby Supply Current

V+ = 6V to 24V, both SMPSs off, includes ISHDN

150

250

µA

V+ Shutdown Supply Current

V+ = 4.5V to 24V

6

15

µA

Quiescent Power Consumption

Both SMPSs on, FB3 = FB5 = SKIP = GND, VOUT3 =

3.5V, VOUT5 = 5.3V

3

4.5

mW

FAULT DETECTION

Overvoltage Trip Threshold

FB3 or FB5 with respect to nominal regulation point

+8

+11

+14

%

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