LM3205TLXSLASHNOPB datasheet(4/28 Pages) TI1

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LM3205

SNVS388E – JULY 2005 – REVISED APRIL 2013

www.ti.com

ELECTRICAL CHARACTERISTICS

(1) (2) (3)

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

range (

−30°C ≤ TA = TJ ≤ +85°C). Unless otherwise noted, all specifications apply to LM3205TL/LM3205SD with: PVIN = VDD

= EN = 3.6V.

Symbol

Parameter

Conditions

Min

Typ

Max

Units

VFB, MIN

Feedback Voltage at

VCON = 0.32V

(3)

0.75

0.8

0.85

minimum setting

VFB, MAX

Feedback Voltage at

VCON = 1.44V, VIN = 4.2V

(3)

3.537

3.6

3.683

maximum setting

ISHDN

Shutdown supply current

EN = SW = VCON = 0V

(4)

0.01

µA

DC bias current into VDD

VCON = 2V, FB = 0V, No Switching

(5)

1.4

RDSON(P) DSBGA

Pin-pin resistance for PFET

ISW = 200mA

200

140

Ω

230

RDSON(N) DSBGA

Pin-pin resistance for NFET ISW = -200mA

415

300

Ω

485

RDSON(P)WSON

Pin-pin resistance for PFET

ISW = 200mA

230

170

Ω

260

RDSON(N)WSON

Pin-pin resistance for NFET ISW = -200mA

445

330

Ω

515

ILIM,PFET

Switch peak current limit

See(6)

935

1100

1200

FOSC

Internal oscillator frequency

1.7

2.3

MHz

VIH,EN

Logic high input threshold

1.2

VIL,EN

Logic low input threshold

0.5

IPIN,EN

Pin pull down current

µA

ZCON

VCON input resistance

100

Ω

Gain

VCON to VOUT Gain

0.32V

≤ VCON ≤ 1.44V

2.5

V/V

(1)

All voltages are with respect to the potential at the GND pins. The LM3205 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 ensured, but do represent the most

likely norm. Due to the pulsed nature of the testing TA = TJ for the electrical characteristics table.

(3)

The parameters in the electrical characteristics table are tested under open loop conditions at PVIN = VDD = 3.6V. 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)

IQ specified here is when the part is operating at 100% duty cycle.

(6)

Current limit is built-in, fixed, and not adjustable. 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 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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