SP7606

12/17/07 rev: A

SP7600

©Copyright 2007 Exar Corporation

EXAR RESERVES THE RIGHT TO MAKE CHANGES TO THIS DATASHEET. CALL FOR UPDATES: 1-510-668-7000

page

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.

Vin....................................................-0.3V to 30V

EN, FB, SHDN, and Vcc ....................-0.3V to 6V

DD, OC..............................................0.3V to 40V

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

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

RECOMMENDED OPERATING

CONDITIONS

Supply Voltage (Vin)............................ 7V to 28V

ESD Rating SHDN pin...................... 1.5KV HBM

ESD Rating all other pins .................... 2KV HBM

Package Thermal Dissipation..................45°C/W

ELECTRICAL CHARACTERISTICS

PARAMETER

MIN

TYP

MAX

UNITS

♦

CONDITIONS

Operating Input Voltage Range

7

28

V

♦

Supply Current

2.2

4.2

mA

♦

Not switching

Vin=28V

Supply current in shutdown

55

160

μA

♦

SHDN_ = HIGH

Vcc Output Voltage

4.8

5.0

5.3

V

♦

Vcc Dropout Voltage

2

V

Icc = 20mA

Under Voltage Lockout

4.1

4.35

4.6

V

♦

Switching Frequency

1.0

1.20

1.4

MHz

Maximum Duty Cycle

86

91

%

♦

Minimum On-time

30

ns

Turn-on Time from Shutdown

200

500

μs

♦

FB reference Voltage

784

800

816

mV

♦

FB Input Current

0.5

μA

♦

Error amplifier gain**

80

dB

Ramp Amplitude**

1.25

Vin/10

4.2

V

Gate Rising Time

50

10 to 90%

Gate Falling Time

40

ns

90 to 10%

Gate Pull-up Resistance

4

Gate Pull-down Resistance

3

Ω

Gate Pull Down Resistance in off state

50

k

Ω

SHDN Logic Low

0

.7

V

♦

Enabled

SHDN Logic High

3

5.3

V

♦

Disabled

SHDN Input Current

.01

0.5

μA

0 to Vcc

Over-Current Protection threshold

0.145

0.20

0.260

V

♦

Over-Current Trip Point Delay

100

ns

♦

DD FET impedance

155

Ω

*Not tested but the specification is guaranteed by design.