LM3687

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SNVS473A – DECEMBER 2007 – REVISED JULY 2008

Electrical Characteristics

full operating temperature range: -30°C

Symbol

Parameter

Conditions

Typical

Limit

Units

Min

Max

Feedback Voltage

PWM Mode

-2.5

+2.5

%

Accuracy

Line Regulation

0.06

%/V

150mA

Load Regulation

100mA

0.0005

%/mA

Pin-Pin Resistance for

280

500

m

Ω

PFET

Pin-Pin Resistance for

200

400

m

Ω

NFET

Switch Peak Current

1172

994

1380

mA

Limit

Internal Oscillator

PWM Mode

1.8

1.3

2.3

MHz

Frequency

(1)

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

(2)

Min and Max limits are guaranteed by design, test, or statistical analysis. Typical numbers are not guaranteed, but do represent the

(3)

input voltage range refer to datasheet curves.

(4)

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%.

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