LMZ30602 datasheet(9/25 Pages) TI1

Part #	LMZ30602

Description	2A SIMPLE SWITCHER Power Module with 2.95V-6V Input in QFN Package

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LMZ30602

www.ti.com

SNVS997 – JULY 2013

APPLICATION INFORMATION

ADJUSTING THE OUTPUT VOLTAGE

The VADJ control sets the output voltage of the LMZ30602. The output voltage adjustment range is from 0.8V to

3.6V. The adjustment method requires the addition of RSET, which sets the output voltage, the connection of

SENSE+ to VOUT, and in some cases RRT which sets the switching frequency. The RSET resistor must be

connected directly between the VADJ (pin 35) and AGND (pin 33 & 34). The SENSE+ pin (pin 36) must be

connected to VOUT either at the load for improved regulation or at VOUT of the module. The RRT resistor must

be connected directly between the RT/CLK (pin 4) and AGND (pins 33 & 34).

Table 1 gives the standard external RSET resistor for a number of common bus voltages, along with the

recommended RRT resistor for that output voltage.

Table 1. Standard RSET Resistor Values for Common Output Voltages

RESISTORS

OUTPUT VOLTAGE VOUT (V)

0.8

1.2

1.5

1.8

2.5

3.3

RSET (kΩ)

open

2.87

1.65

1.15

0.673

0.459

RRT (kΩ)

1200

715

348

174

For other output voltages, the value of the required resistor can either be calculated using the following formula,

or simply selected from the range of values given in Table 2.

(1)

Table 2. Standard RSET Resistor Values

VOUT (V)

RSET (kΩ)

RRT(kΩ)

fSW(kHz)

VOUT (V)

RSET (kΩ)

RRT(kΩ)

fSW(kHz)

0.8

open

1200

650

2.3

0.768

174

1500

0.9

11.8

1200

650

2.4

0.715

174

1500

1.0

5.83

1200

650

2.5

0.673

174

1500

1.1

3.83

1200

650

2.6

0.634

174

1500

1.2

2.87

715

750

2.7

0.604

174

1500

1.3

2.32

715

750

2.8

0.576

174

1500

1.4

1.91

715

750

2.9

0.549

174

1500

1.5

1.65

348

1000

3.0

0.523

174

1500

1.6

1.43

348

1000

3.1

0.499

174

1500

1.7

1.27

348

1000

3.2

0.475

174

1500

1.8

1.15

348

1000

3.3

0.459

174

1500

1.9

1.05

348

1000

3.4

0.442

174

1500

2.0

0.953

174

1500

3.5

0.422

174

1500

2.1

0.845

174

1500

3.6

0.412

174

1500

2.2

0.825

174

1500

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