SP6123 datasheet(2/18 Pages) SIPEX

2 / 18 page

Date: 5/25/04

SP6123 Low Voltage, Synchronous Step Down PWM Controller

PARAMETER

MIN

TYP MAX

UNITS

CONDITIONS

QUIESCENT CURRENT

VCC Supply Current

0.5

1.0

No Switching

VCC Supply Current (Disabled)

µA

COMP = 0V

ERROR AMPLIFIER

Error Amplifier Transconductance

0.6

COMP Sink Current

µAVFB = 0.9V, COMP = 0.9V, No Faults

COMP Source Current

µAVFB = 0.7V, COMP = 2V

COMP Output Impedance

MΩ

VFB Input Bias Current

100

Error Amplifier Reference

0.788 0.8

0.812

Trimmed with Error Amp in Unity Gain

OSCILLATOR & DELAY PATH

Internal Oscillator Frequency

270

300

330

kHz

SP6123

Internal Oscillator Frequency

450

500

550

kHz

SP6123A

Max. Controlled Duty Cycle

Minimum Duty Cycle

Comp=0.7V

Minimum GH Pulse Width

100

250

VCC > 4.5V, Ramp up COMP voltage until

GH starts switching

CURRENT LIMIT

Internal Current Limit Threshold

160

200

240

VCC - VSWN ; Temp = 25 °C;

VBST - VCC > 2.5V

Current Limit Threshold

0.34

%/C

Temperature Coefficient

Current Limit Time Constant

SOFT START, SHUTDOWN, UVLO

Internal Soft Start Slew Rate

SP6123A

0.35 0.60

0.95

V/ms

VFB = 0.7V and 0V, measure hiccup cycle

SP6123

0.1

0.3

0.6

V/ms

period

COMP Discharge Current

185

µA

COMP = 0.5V, Fault Initiated

COMP Clamp Voltage

0.55 0.65

0.75

VFB = 0.9V

COMP Clamp Current

µA

COMP = 0.5V, VFB = 0.9V

Shutdown Threshold Voltage

0.29 0.34

0.39

Measured at COMP Pin

Shutdown Input Pull-up Current

µA

COMP = 0.2V, Measured at COMP pin

VCC Start Threshold

2.63

2.8

2.95

VCC Stop Threshold

2.47

2.7

2.9

Unless otherwise specified: 0°C < TA < 70°C, 3.0V < VCC < 5.5V, CCOMP = 22nF, CGH = CGL = 3.3nF, VFB = 0.8V,

SWN = GND=0V, typical value for design guideline only.

ABSOLUTE MAXIMUM RATINGS

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

BST .................................................................. 13.2V

BST-SWN .............................................................. 7V

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

Peak Output Current < 10µs

GH,GL .................................................................. 2A

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

Power Dissipation

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

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

ELECTRICAL CHARACTERISTICS

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