© 2010 Semtech Corporation

Recommended Operating Conditions

Absolute Maximum Ratings

Thermal Information

LX to GND ……………………………………… - 0.3 to +6.0V

VIN to PGND, EN/PSV to AGND ………………… -0.3 to +6.0V

VIN to VDD…………………………………………………+0.3V

BST to LX ………………………………………… -0.3 to +6.0V

BST to PGND……………………………………

-0.3 to +12V

VDD to AGND, VOUT to AGND………………… -0.3V to +6.0V

FB, PGOOD, TON …………………………… -0.3 to VDD + 0.3V

AGND to PGND…………………………………

-0.3 to +0.3V

Peak IR Reflow Temperature ……………….…………… 260°C

Supply Input Voltage……………………………… 3V to 5.5V

Maximum Continuous Output Current …………………… 4A

Storage Temperature …………………………… -60 to +150°C

Maximum Junction Temperature ……………………… 150°C

Operating Junction Temperature ……………… -40 to +125°C

Exceeding the above specifications may result in permanent damage to the device or device malfunction. Operation outside of the parameters

specified in the Electrical Characteristics section is not recommended.

NOTES-

(1) This device is ESD sensitive. Use of standard ESD handling precautions is required.

(2) Tested according to JEDEC standard JESD22-A114-B.

Electrical Characteristics

Unless specified: V

Parameter

Symbol

Conditions

Min

Typ

Max

Units

Input Supplies

VIN, VDD Input Voltage

3

5.5

V

VDD UVLO Threshold

Rising UVLO V

TH

2.75

2.90

2.98

V

VDD UVLO Hysteresis

100

200

mV

VIN, VDD Supply Current

EN/PSV= 0V

5

15

μA

I

(1)

500

Forced Continuous Conduction Mode

I

(1)

1000

Controller

FB On-Time Threshold

0.7425

0.75

0.7575

V

Frequency Programming Range

See R

200

1000

kHz

FB Input Bias Current

FB=VDD or 0V

-1

+1

μA

Timing

On-Time

Continuous Mode

V

2.7

3

3.3

μ

s

80

ns

250

ns

3

SC174