LM3208 datasheet(4/17 Pages) NSC

4 / 17 page

System Characteristics The following spec table entries are guaranteed by design providing the component

values in the typical application circuit are used (L = 3.0µH, DCR = 0.12

Ω, FDK MIPW3226D3R0M; C

IN = 10µF, 6.3V, 0805,

TDK C2012X5R0J106K; C

OUT = 4.7µF, 6.3V, 0603, TDK C1608X5R0J475M). These parameters are not guaranteed by

production testing. Min and Max values are specified over the ambient temperature range T

A = −30˚C to 85˚C. Typical val-

ues are specified at PV

IN =VDD = EN = 3.6V and TA = 25˚C unless otherwise specified.

Symbol

Parameter

Conditions

Min

Typ

Max

Units

RESPONSE

Time for V

OUT to rise from 0.8V

to 3.4V (to reach 3.35V)

IN = 4.2V, RLOAD = 5.5

Ω

µs

Time for V

OUT to fall from 3.4V

to 0.8V

IN = 4.2V, RLOAD =15

Ω

µs

CON

CON input capacitance

CON = 1V, VIN=2.7V to 5.5V,

Test frequency = 100kHz

510

EN input capacitance

EN = 2V, V

IN= 2.7V to 5.5V,

Test frequency = 100kHz

510

CON

(S>L)

DSON(P) management

threshold

Threshold for PFET R

DSON(P) to change

from 960m

Ω to 140mΩ

0.39

0.42

0.45

CON

(L>S)

DSON(P) management

threshold

Threshold for PFET R

DSON(P) to change

from 140m

Ω to 960mΩ

0.37

0.40

0.43

OUT, MAX

Maximum Output Current

IN = 2.7V to 5.5V, VCON = 0.45V to

1.44V, L = MIPW3226D3R0

650

IN = 2.7V to 5.5V, VCON = 0.32V to

0.45V, L = MIPW3226D3R0

400

Linearity

Linearity in control range 0.32V

to 1.44V

IN = 3.9V (Note 14)

Monotonic in nature

−3

−50

+50

Turn on time

(time for output to reach 97% of

final value after Enable low to

high transition)

EN = Low to High, V

IN = 4.2V, VOUT =

3.4V,

OUT

≤ 1mA

µs

Efficiency

IN = 3.6V, VOUT = 0.8V, IOUT = 90mA

IN = 3.6V, VOUT = 1.5V, IOUT = 150mA

IN = 3.9V, VOUT = 3.4V, IOUT = 400mA

OUT_ripple

Ripple voltage at

no pulse skip condition

IN = 2.7V to 4.5V, VOUT = 0.8V to 3.4V,

Differential voltage = V

IN -VOUT > 1V,

OUT = 0mA to 400mA (Note 12)

mVp-p

Ripple voltage at

pulse skip condition

IN = 5.5V to dropout, VOUT = 3.4V,

OUT = 650mA (Note 12)

mVp-p

Line_tr

Line transient response

IN = 3.6V to 4.2V,

R =TF = 10µs,

OUT = 0.8V, IOUT = 100mA

mVpk

Load_tr

Load transient response

IN = 3.1/3.6/4.5V, VOUT = 0.8V,

OUT = 50mA to 150mA

mVpk

Max Duty

cycle

Maximum duty cycle

100

Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the component may occur. Operating Ratings are conditions under which operation of

the device is guaranteed. Operating Ratings do not imply guaranteed performance limits. For guaranteed performance limits and associated test conditions, see the

Electrical Characteristics tables.

Note 2: All voltages are with respect to the potential at the GND pins. The LM3208 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.

Note 3: Internal thermal shutdown circuitry protects the device from permanent damage. Thermal shutdown engages at TJ = 150˚C (typ.) and disengages at TJ =

125˚C (typ.).

Note 4: The Human body model is a 100pF capacitor discharged through a 1.5k

Ω resistor into each pin. (MIL-STD-883 3015.7) The machine model is a 200pF

capacitor discharged directly into each pin.

Note 5: In applications where high power dissipation and/or poor package thermal resistance is present, the maximum ambient temperature may have to be

de-rated. Maximum ambient temperature (TA-MAX) is dependent on the maximum operating junction temperature (TJ-MAX-OP = 125˚C), the maximum power

dissipation of the device in the application (PD-MAX), and the junction-to ambient thermal resistance of the part/package in the application (θJA), as given by the

following equation: TA-MAX =TJ-MAX-OP –(θJA xPD-MAX).

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