SP6121 datasheet(2/16 Pages) SIPEX

2 / 16 page

Date: 5/25/04

SP6121 Low Voltage, Synchronous Step Down PWM Controller

PARAMETER

MIN

TYP

MAX

UNITS CONDITIONS

QUIESCENT CURRENT

CC Supply Current

0.5

1.0

No Switching

CC Supply Current (Disabled)

µA

COMP = 0V

ERROR AMPLIFIER

Error Amplifier Transconductance

600

µs

COMP Sink Current

µAVFB = 1.35V, COMP=0.8V, No Faults

COMP Source Current

µAVFB =1.15V, COMP=1.8V

COMP Output Impedance

MΩ

FB Input Bias Current

100

ERROR AMPLIFIER REFERENCE

Initial Accuracy

1.238

1.250

1.262

Trimmed with Error Amp in Unity Gain

Error Amplifier Reference over

1.225

1.250

1.275

Line, Load and Temperature

OSCILLATOR & DELAY PATH

Internal Oscillator Frequency

440

500

560

kHz

Maximum Duty Cycle

100

COMP = 2V

Minimum Duty Cycle

COMP = 0.8V

Minimum PDRV Pulse Width

100

CC > 4.5V, Ramp up COMP voltage

until PDRV starts switching

CURRENT LIMIT

Internal Current Limit Threshold

125

160

195

ISET - VISENSE, TA = 25°C

ISET Sink Current

µAVISET =5V, TA = 25°C

Current Limit Threshold and

0.33

%/C

ISET Temperature Coefficient

Current Limit Time Constant

µs

ISENSE Input Bias Current

100

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

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

FB = 1.3V

COMP Clamp Current

100

µA

COMP = 0.5V, V

FB =1.15V

ELECTRICAL SPECIFICATIONS

Unless otherwise specified: 0°C < TA < 70°C, 3.0V < VCC < 5.5V, CCOMP = 22nF, CPDRV = CNDRV = 3.3nF, VFB = 1.25V, ISET = ISENSE = VCC, GND=0V

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.

VCC ...................................................................................................... 7V

All other pins ............................... -0.3V to VCC+0.3V

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

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