4

FN9202.1

June 17, 2005

OSCILLATOR

Frequency

245

300

355

kHz

PWM Ramp Voltage (peak-peak)

CSIP=18V

1.6

V

CSIP=11V

1

V

SYNCHRONOUS BUCK REGULATOR

Maximum Duty Cycle

97

99

99.6

%

UGATE Pull-up Resistance

BOOT-PHASE=5V, 500mA source current

1.8

3.0

Ω

UGATE Source Current

BOOT-PHASE=5V, BOOT-UGATE=2.5V

1.0

A

UGATE Pull-down Resistance

BOOT-PHASE=5V, 500mA sink current

1.0

1.8

Ω

UGATE Sink Current

BOOT-PHASE=5V, UGATE-PHASE=2.5V

1.8

A

LGATE Pull-up Resistance

VDDP-PGND=5V, 500mA source current

1.8

3.0

Ω

LGATE Source Current

VDDP-PGND=5V, VDDP-LGATE=2.5V

1.0

A

LGATE Pull-down Resistance

VDDP-PGND=5V, 500mA sink current

1.0

1.8

Ω

LGATE Sink Current

VDDP-PGND=5V, LGATE=2.5V

1.8

A

CHARGING CURRENT SENSING AMPLIFIER

Input Common-Mode Range

0

18

V

Input Offset Voltage

Guarantee by design

-2.5

0

2.5

mV

Input Bias Current at CSOP

0 < CSOP < 18V

0.25

2

µA

Input Bias Current at CSON

0 < CSON < 18V

75

100

µA

CHLIM Input Voltage Range

0

3.6

V

CSOP to CSON Full-Scale Current

Sense Voltage

ISL6251: CHLIM=3.3V

157

165

173

mV

ISL6251A, CHLIM=3.3V

160

165

170

mV

ISL6251: CHLIM=2.0V

95

100

105

mV

ISL6251A: CHLIM=2.0V

97

100

103

mV

ISL6251: CHLIM=0.2V

5.0

10

15.0

mV

ISL6251A: CHLIM=0.2V

7.5

10

12.5

mV

CHLIM Input Bias Current

CHLIM=GND or 3.3V, DCIN=0V

-1

1

µA

CHLIM Power-Down Mode Threshold

Voltage

CHLIM rising

80

88

95

mV

CHLIM Power-Down Mode Hysteresis

Voltage

15

25

40

mV

ADAPTER CURRENT SENSING AMPLIFIER

Input Common-Mode Range

7

25

V

Input Offset Voltage

Guarantee by design

-2

2

mV

Input Bias Current at CSIP & CSIN

Combined

CSIP=CSIN=25V

100

130

µA

Input Bias Current at CSIN

0 < CSIN < DCIN, Guaranteed by design

0.10

1

µA

Electrical Specifications

DCIN=CSIP=CSIN=18V, CSOP=CSON=12V, ACSET=1.5V, ACLIM=VREF, VADJ=Floating, EN=VDD=5V,

otherwise noted. (Continued)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNITS

ISL6251, ISL6251A