LM3676 datasheet(4/25 Pages) TI

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LM3676

SNVS426C – NOVEMBER 2006 – REVISED MAY 2013

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Operating Ratings

(1) (2)

Input Voltage Range

2.9V to 5.5V

Recommended Load Current

0mA to 600 mA

Junction Temperature (TJ) Range

−30°C to +125°C

Ambient Temperature (TA) Range

(3)

−30°C to +85°C

(1)

Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings are conditions under

which operation of the device is ensured. Operating Ratings may not imply performance limits. For performance limits and associated

test conditions, see the Electrical Characteristics tables.

(2)

All voltages are with respect to the potential at the GND pin.

(3)

In Applications where high power dissipation and/or poor package resistance is present, the maximum ambient temperature may have

to be derated. Maximum ambient temperature (TA-MAX) is dependent on the maximum operating junction temperature (TJ-MAX), the

maximum power dissipation of the device in the application (PD-MAX) and the junction to ambient thermal resistance of the package (θJA)

in the application, as given by the following equation:TA-MAX= TJ-MAX− (θJAx PD-MAX). Refer to Dissipation rating table for PD-MAX values at

different ambient temperatures.

Thermal Properties

Junction-to-Ambient Thermal Resistance (

θJA) for 4 layer board

(1)

56°C/W

(1)

Junction to ambient thermal resistance (

θJA) is highly application and board layout dependent. In applications where high power

dissipation exists, special care must be given to thermal dissipation issues in board design. Specified value of 130 °C/W for WSON is

based on a 4 layer, 4" x 3", 2/1/1/2 oz. Cu board as per JEDEC standards is used.

Electrical Characteristics

(1) (2) (3)

Limits in standard typeface are for TJ = 25°C. Limits in boldface type apply over the full operating junction temperature range

(

−30°C ≤ TJ ≤ +125°C). Unless otherwise noted, specifications apply to the LM3676SD with VIN = 3.6V

Symbol

Parameter

Test Conditions

Min

Typ

Max

Unit

VFB

Feedback Voltage (Fixed / Adj) (4)

-4

Line Regulation

2.9V

≤ VIN ≤ 5.5V

0.031

%/V

IO = 10 mA

Load Regulation

100 mA

≤ IO ≤ 600 mA

0.0013

%/mA

VIN= 3.6V

VREF

Internal Reference Voltage

0.5

ISHDN

Shutdown Supply Current

EN = 0V

0.01

µA

DC Bias Current into VIN

No load, device is not switching (FB

µA

forced higher than programmed output

voltage)

RDSON (P)

Pin-Pin Resistance for PFET

380

500

Ω

RDSON (N)

Pin-Pin Resistance for NFET

250

400

Ω

ILIM

Switch Peak Current Limit (5)

Open Loop

830

1020

1200

VIH

Logic High Input for EN and Mode Pin

1.0

VIL

Logic Low Input for EN and Mode Pin

0.4

IEN

Enable (EN) Input Current

0.01

µA

IMode

Mode Pin Input Current

0.01

µA

FOSC

Internal Oscillator Frequency

PWM Mode

1.6

2.6

MHz

(1)

All voltages are with respect to the potential at the GND pin.

(2)

Min and Max limits are specified by design, test or statistical analysis. Typical numbers represent the most likely norm.

(3)

The parameters in the electrical characteristic table are tested at VIN= 3.6V unless otherwise specified. For performance over the input

voltage range refer to datasheet curves.

(4)

Test condition: for VOUT less than 2.5V, VIN = 3.6V; for VOUT greater than or equal to 2.5V, VIN = VOUT + 1V.

(5)

Refer to datasheet curves for closed loop data and its variation with regards to supply voltage and temperature. Electrical Characteristic

table reflects open loop data (FB=0V and current drawn from SW pin ramped up until cycle by cycle current limit is activated). Closed

loop current limit is the peak inductor current measured in the application circuit by increasing output current until output voltage drops

by 10%.

Dissipation Ratings

θJA

TA≤ 25°C

TA= 60°C

TA= 85°C

Power Rating

56°C/W (4 layer board) 8 Lead non-pullback WSON package

1.78W

1.16W

714mW

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