SP6128ACY datasheet(2/10 Pages) SIPEX

2 / 10 page

Rev. 08/19/05

SP6128A Low Voltage, Synchronous Step Down PWM Controller

PARAMETER

MIN

TYP MAX

UNITS

CONDITIONS

QUIESCENT CURRENT

VCC Supply Current

0.5

1.0

No Switching

PVCC Supply Current

µA

No Switching, GH = Low

VCC Supply Current(Disabled)

µA

COMP=0V

PVCC Supply Current (Disabled)

µA

COMP=0V

ERROR AMPLIFIER

Error Amplifier Transconductance

0.6

COMP Sink Current

µA

VFB = 0.9V, COMP = 0.9V, No Faults

COMP Source Current

µA

VFB = 0.7V, COMP = 2V

COMP Output Impedance

MΩ

VFB Input Bias Current

130

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

Maximum Controlled Duty Cycle

Loop in control - 100% DC Possible

Minimum Duty Cycle

Comp=0.7V

Minimum GH Pulse Width

150

250

PVCC > 4.5V, Ramp up COMP voltage

until GH starts switching

CURRENT LIMIT

ISET Pin Sink Current

12.5

µA

Temp = 25 °C

ISET Current Temperature Coefficient

3400

ppm/°C

Current Limit Time Constant

µs

Overcurrent Comparator

100

125

150

VISET - VSWN, Temp = 25°C

Threshold Voltage

Threshold Voltage Temperature

3400

ppm/°C

Coefficient

ELECTRICAL CHARACTERISTICS

Unless otherwise specified: -40°C < TA < 85°C, 3.0V < PVCC = VCC < 5.5V, CCOMP = 22nF, CGH = CGL = 3.3nF, VFB = 0.8V,

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

VCC, PVCC ......................................................................................... 7V

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

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

SWN ............................................................ -1V to 7V

GH ............................................... -0.3V to BST +0.3V

GH-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 .............................................. 1.3W

Junction Temperature, TJ ................................ 125°C

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

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

Thermal Resistance

θJC ............................. 31.7°C/W

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.

ABSOLUTE MAXIMUM RATINGS

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