LM3203 datasheet(3/23 Pages) TI1

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LM3203

www.ti.com

SNVS355C – MAY 2005 – REVISED JULY 2005

Table 1. Pin Description 4.7µF for COUT and 10µF for CIN

Pin #

Name

Description

VDD

Analog Supply Input. A 0.1 µF ceramic capacitor is recommended to be placed as close to this pin as

possible. (Figure 3)

VCON

Voltage Control Analog input. VCON controls VOUT in PWM mode. (Refer to Setting the Output Voltage) Do not

leave floating.

Feedback Analog Input. Connect to the external resistor divider. (Figure 3)

BYP

Bypass. Use this digital input to command operation in Bypass mode. Set BYP low for PWM operation.

Enable Input. Set this digital input high after Vin >2.7V for normal operation. For shutdown, set low.

PGND

Power Ground

Switching Node connection to the internal PFET switch and NFET synchronous rectifier.

Connect to an inductor with a saturation current rating that exceeds the maximum Switch Peak Current Limit

specification of the LM3203.

PVIN

Power Supply Voltage Input to the internal PFET switch and Bypass FET. (Figure 3)

BYPOUT

Bypass FET Drain. Connect to the output capacitor. (Figure 3) Connect this pin to VDD when Bypass mode is

NOT required. Do not leave floating.

SGND

Analog and Control Ground

These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam

during storage or handling to prevent electrostatic damage to the MOS gates.

Absolute Maximum Ratings

(1) (2) 4.7µF for C

OUT and 10µF for CIN

VDD, PVIN to SGND

−0.2V to +6.0V

PGND to SGND

−0.2V to +0.2V

EN, FB, BYP, VCON

(SGND

−0.2V)

to (VDD +0.2V)

w/6.0V max

SW, BYPOUT

(PGND

−0.2V)

to (PVIN +0.2V)

w/6.0V max

PVIN to VDD

−0.2V to +0.2V

Continuous Power Dissipation(3)

Internally Limited

Junction Temperature (TJ-MAX)

+150°C

Storage Temperature Range

−65°C to +150°C

Maximum Lead Temperature

(Soldering, 10 sec)

+260°C

ESD Rating (4)

Human Body Model

2.0 kV

(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 table.

(2)

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

(3)

Internal thermal shutdown circuitry protects the device from permanent damage. Thermal shutdown engages at TJ = 150°C (typ.) and

disengages at TJ = 130°C (typ.).

(4)

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

Ω resistor into each pin. (MIL-STD-883 3015.7) . National

Semiconductor recommends that all integrated circuits be handled with appropriate precautions.

Operating Ratings

(1) (2) 4.7µF for C

OUT and 10µF for CIN

Input Voltage Range

2.7V to 5.5V

Recommended Load Current

PWM Mode

0mA to 500mA

Bypass Mode

0mA to 500mA

(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 table.

(2)

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

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