Date: 5/25/04

SP6121 Low Voltage, Synchronous Step Down PWM Controller

© Copyright 2004 Sipex Corporation

2

PARAMETER

MIN

TYP

MAX

UNITS CONDITIONS

QUIESCENT CURRENT

V

-

0.5

1.0

mA

No Switching

V

-

25

60

µA

COMP = 0V

ERROR AMPLIFIER

Error Amplifier Transconductance

600

µs

COMP Sink Current

15

35

65

COMP Source Current

15

35

65

COMP Output Impedance

3

MΩ

V

100

nA

ERROR AMPLIFIER REFERENCE

Initial Accuracy

1.238

1.250

1.262

V

Trimmed with Error Amp in Unity Gain

Error Amplifier Reference over

1.225

1.250

1.275

V

Line, Load and Temperature

OSCILLATOR & DELAY PATH

Internal Oscillator Frequency

440

500

560

kHz

Maximum Duty Cycle

100

-

-

%

COMP = 2V

Minimum Duty Cycle

-

-

0

%

COMP = 0.8V

Minimum PDRV Pulse Width

100

ns

V

until PDRV starts switching

CURRENT LIMIT

Internal Current Limit Threshold

125

160

195

mV

V

ISET Sink Current

25

30

35

Current Limit Threshold and

0.33

%/C

ISET Temperature Coefficient

Current Limit Time Constant

15

µs

ISENSE Input Bias Current

-

-

100

nA

SOFT START, SHUTDOWN, UVLO

Internal Soft Start Slew Rate

0.4

V/ms

Measured at COMP pin on the

transition from shutdown

Internal Soft Start Delay Time

1.5

ms

COMP charging to PDRV switching

COMP Discharge Current

150

300

µA

COMP = 0.5V, Fault Initiated

COMP Clamp Voltage

0.6

0.7

0.8

V

V

COMP Clamp Current

100

µA

COMP = 0.5V, V

ELECTRICAL SPECIFICATIONS

These are stress ratings only and functional

operation of the device at these ratings or any other

above those indicated in the operation sections of

the specifications below is not implied. Exposure to

absolute maximum rating conditions for extended

periods of time may affect reliability.

Peak Output Current < 10µs

PDRV, NDRV ....................................................... 2A

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

Lead Temperature (Soldering, 10 sec) .......... 300°C

ESD Rating ............................................... 2kV HBM

ABSOLUTE MAXIMUM RATINGS