SP7648 datasheet(2/12 Pages) SIPEX

2 / 12 page

Date: 7/20/05

SP7648 Ultra-low Quiescent Current, High Efficiency Boost Regulator

LX, Vo, VBATT , FLASHOUT, FB to GND pin ...................... -0.3 to 6.0V

SHDN, FLASH ..................................................... -0.3V to VBATT +1.0V

Vo, GND, LX Current ....................................................................... 2A

Reverse VBATT Current .............................................................. 220mA

Forward VBATT Current .............................................................. 500mA

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

PARAMETER

MIN

TYP

MAX

UNITS

♦

CONDITIONS

Input Voltage Operating Range, VBATT

2.7

4.5

♦

After Startup

Output Voltage Range, VOUT

2.7

5.5

♦

Under Voltage Lock-out/UVLO

0.5

0.61

0.7

♦

Output Voltage, VO

4.6

5.0

5.4

♦

Internal Feedback Divider

Shutdown Current into VO, ISDO

-1

500

♦

VSHDN = ZeroV

Shutdown Current into VBATT, ISDB

250

750

♦

VSHDN = ZeroV, VBATT = 2.7V

Efficiency

VBATT = 2.7V, IOUT = 200mA, RLIM = 2kΩ

Inductor Peak Current Limit, IPK

650

800

1000

♦

RLIM = 2kΩ, IPK = 1600/RLIM

1600

♦

RLIM = 1kΩ, IPK = 1600/RLIM

Output Current (Note 2)

800

VBATT = 2.7V, RLIM =1kΩ

400

VBATT = 2.7V, RLIM =2kΩ

200

VBATT = 2.7V, RLIM = 4kΩ

Minimum Off-Time Constant KOFF

0.5

1.0

1.5

V*µs

♦

KOFF ≤ TOFF (VOUT - VBATT)

Maximum On-Time Constant KON

2.0

3.5

5.0

V*µs

♦

KON ≥ TON (VBATT)

Enable Valid to Output Stable (Note 3)

300

500

µs-

ILOAD = 1mA

NMOS Switch Resistance

0.30

0.6

Ω♦

INMOS = 100mA

PMOS Switch Resistance

0.30

0.6

Ω♦

IPMOS = 100mA

FB Set Voltage, VFB

0.76

0.8

0.84

♦

External feedback Flash = 0

0.266

0.288

0.310

♦

External feedback Flash = 1

FB Input Current

100

♦

VFB =1.3V

SHDN Input Voltage (Note 1)

VIL

0.5

♦

VBATT = 2.7V

VIH

2.0

♦

VBATT = 2.7V

SHDN Input Current

100

♦

LX Pin Leakage

µA-

FLASH Threshold

VIL

0.4

VIH

1.0

ELECTRICAL SPECIFICATIONS

VBATT =VSHDN = 3.6V, VFB=ZeroV, ILOAD = 0mA, TAMB= -40°C to +85°C, VOUT = 5.0V, typical values at 27°C unless

otherwise noted. The ♦ denotes the specifications which apply over full operating temperature range -40ºC to +85°C, unless

otherwise specified.

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

ESD Rating ........................................................................ 1.5kV HBM

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

Note 1: SHDN must transition faster than 1V/100mS for proper operation.

Note 2: Output Current I =

{ VIN } X Efficiency x {Inductor Peak Current - Inductor Ripple Current}

VOUT

Note 3: Guaranteed by Design.

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