LM3203

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SNVS355C – MAY 2005 – REVISED JULY 2005

Electrical Characteristics

range (

Symbol

Parameter

Conditions

Min

Typ

Max

Units

2.7

5.5

V

Feedback Voltage at

0.250

0.267

0.284

V

Minimum Setting

Feedback Voltage at

1.176

1.200

1.224

V

Maximum Setting

OVP

Over-Voltage Protection

(4)

100

150

mV

Threshold

Shutdown Supply

0.1

3

µA

DC Bias Current into

675

780

µA

Switching

680

780

µA

Pin-Pin Resistance for

320

450

m

Ω

P-FET

Pin-Pin Resistance for

310

450

m

Ω

N-FET

Pin-Pin Resistance for

85

120

m

Ω

(BYP)

Bypass FET

Switch Current Limit

(6)

700

820

940

mA

Bypass FET Current

(7)

800

1000

1200

mA

Limit

Internal Oscillator

1.7

2

2.2

MHz

Frequency

Logic High Input

1.20

V

Threshold for EN, BYP

Logic Low Input

0.4

V

Threshold for EN, BYP

Pin Pull Down Current

EN, BYP = 3.6V

5

10

µA

for EN, BYP

Gain

1

V/V

1

M

Ω

(1)

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

(2)

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

most likely norm.

(3)

The LM3203 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.

(4)

while in PWM mode. The OVP threshold will be the value of the threshold at the FB voltage times the resistor divider ratio. In the

Figure 3, 100mV (typ.) × ((267K + 133K) ÷ 133K).

(5)

Shutdown current includes leakage current of PFET and Bypass FET.

(6)

Electrical Characteristics table reflects open loop data (FB=0V and current drawn from SW pin ramped up until cycle by cycle current

limit is activated). Refer to Typical Performance Characteristics (Open/Closed Loop Current Limit vs Temperature (PWM Mode) curve)

for closed loop data and its variation with regards to supply voltage and temperature. Closed loop current limit is the peak inductor

current measured in the application circuit by increasing output current until output voltage drops by 10%.

(7)

Copyright © 2005, Texas Instruments Incorporated

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