LM3218

SNOSB11B – MARCH 2008 – REVISED MARCH 2013

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ELECTRICAL CHARACTERISTICS

(1) (2) (3)

range (

3.6V.

Symbol

Parameter

Conditions

Min

Typ

Max

Units

Feedback voltage at minimum

(3)

0.75

0.80

0.85

V

setting

Feedback voltage at maximum

(3)

3.526

3.600

3.696

V

setting

Shutdown supply current

(4)

0.01

2

µA

0.6

0.7

mA

300

400

m

Ω

T

Large PFET (L) Switch peak

(6)

(L_PFET

current limit

1100

mA

)

Small PFET (S) Switch peak

(6)

(S_PFET

current limit

800

mA

)

Internal oscillator frequency

2.0

MHz

1.2

V

E

Logic low input threshold

0.5

V

E

EN = 3.6V

5

10

µA

E

0.15

V

switches

±1

µA

Gain

0.32V

2.5

V/V

(1)

All voltages are with respect to the potential at the GND pins. The LM3218 is designed for mobile phone applications where turn-on after

power-up is controlled by the system controller and where requirements for a small package size overrule increased die size for internal

Under Voltage Lock-Out (UVLO) circuitry. Thus, it should be kept in shutdown by holding the EN pin low until the input voltage exceeds

2.7V.

(2)

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

(3)

specified. For performance over the input voltage range and closed-loop results, refer to the datasheet curves.

(4)

Shutdown current includes leakage current of PFET.

(5)

(6)

Current limit is built-in, fixed, and not adjustable. Electrical Characteristic table reflects open loop data (FB = 0V and current drawn from

SW pin ramped up until cycle by cycle limit is activated). Refer to System Characteristics table for maximum output current.

4

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