SP6656_06 datasheet(2/16 Pages) SIPEX

2 / 16 page

Date: 3/6/06

SP6656, 400mA Synchronous Buck Regulator with Dynamically Adjustable Voltage Output

VIN = UVIN = VEN = 3.6V, VOUT = VFB, IO = 0mA, TAMB = -40°C to +85°C, typical values at 25°C unless otherwise noted.

IN,VIN .............................................................................................. 6V

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

IN+0.3V

IN, PGND, LX current ........................................................................ 2A

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

Operating Temperature ................................................. -40°C to +85°C

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.

ELECTRICAL CHARACTERISTICS

PARAMETER

MIN

TYP

MAX

UNITS

CONDITIONS

Input Voltage Operating

UVLO

5.5

Range

Minimum Output Voltage

1.0

FB Set Voltage, Vr

0.784

0.800

0.816

25°C, IO = 200mA Close Loop. LI = 10µH,

COUT = 22µF

Overall Accuracy

Measured at VIN = 5.5V, no load and

(-40°C to 85°C)

±5%

VIN=3.6V, 200mA load, Close Loop

(0°C to 70°C)

±4

On-Time Constant - KON

1.5

2.25

3.0

V*µsClose Loop, LI = 10µH,COUT = 22µF

Min, TON=KON/(VIN-VOUT)

Off-Time Constant - KOFF

1.6

2.4

3.2

V*µsInductor current limit tripped, VFB = 0.5V

Min, TOFF=KOFF/VOUT

Measured at VOUT = 1V

Off-Time Blanking

100

Turn On Time

250

400

µs

400mA Load

PMOS Switch Resistance

0.3

0.6

Ω

IPMOS = 200mA

NMOS Switch Resistance

0.3

0.6

Ω

INMOS = 200mA

Inductor Current Limit

500

625

750

VFB = 0.5V

Power Efficiency

VOUT = 2.5V, IO = 200mA

VOUT = 3.3V, IO = 400mA

Minimum Guaranteed Load

400

500

Current

VIN Quiescent Current

µAVOUT = 3.3V, VIN = 3.6V and VIN = 5.5V

VIN Shutdown Current

500

EN = 0.0V

VOUT Quiescent Current

µAVOUT = 3.3V

VOUT Shutdown Current

500

EN = 0.0V

UVLO

Undervoltage Lockout

2.55

2.70

2.85

EN = VIN,

Threshold, VIN falling

UVLO hysteresis

OVSO Output Voltage

100

VIN = EN; Iovso =1mA; OVSI = 1 = Vcc

OVSO Leakage Current

100

VIN = EN; Vovso= 3.6V;OVSI= 0.0V= GND

Over-Temperature

140

°C

Rising Trip Point

Over-Temperature Hysteresis

°C

EN Leakage Current

500

EN Input Threshold Voltage

0.60

0.90

High to Low Transition

1.25

1.8

Low to High Transition

FB Leakage Current

100

FB =1V

LX Leakage

µA

EN = 0.0V, VIN = 3.6V

LX = 0.0V, LX = VIN + 0.2V

OVSI Leakage Current

500

OVSI Input Threshold Voltage

0.60

0.90

High to Low Transition

1.25

1.8

Low to High Transition

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