LM3537

SNVS634B – JUNE 2011 – REVISED MAY 2013

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Low Dropout Voltage Regulators

The four low dropout voltage regulators are designed to operate with small-size ceramic input and output

capacitors. They can operate with power rail voltages down to 1.8V. The LDOs 2, 3 and 4 offer a typical dropout

voltage of 100 mV at 150 mA output current. The single, higher-current LDO 1 offers a typical dropout voltage of

220 mV at 300mA output current. The LDOs are enabled by the EN_LDO1, EN_LDO2, EN_LDO3 and EN_LDO4

bits (see Table 5 for details). summarizes the supported output voltages. At startup, the LDOs are off but are

preset to 1.8V (for LDO2 and LDO3) and 2.8V (for LDO1 and LDO4).

Table 4. Regulator Voltage Options

Output Voltage

LDOX_VOUT[4]

LDOX_VOUT[3]

LDOX_VOUT[2]

LDOX_VOUT[1]

LDOX_VOUT[0]

(typ.)

1

1

1

1

1

3.30V

1

1

1

1

0

3.20V

1

1

1

0

1

3.10V

1

1

1

0

0

3.00V

1

1

0

1

1

2.95V

1

1

0

1

0

2.90V

1

1

0

0

1

2.85V

1

1

0

0

0

2.80V

1

0

1

1

1

2.75V

1

0

1

1

0

2.70V

1

0

1

0

1

2.65V

1

0

1

0

0

2.60V

1

0

0

1

1

2.55V

1

0

0

1

0

2.50V

1

0

0

0

1

2.40V

1

0

0

0

0

2.20V

0

1

1

1

1

2.00V

0

1

1

1

0

1.90V

0

1

1

0

1

1.85V

0

1

1

0

0

1.80V

0

1

0

1

1

1.75V

0

1

0

1

0

1.70V

0

1

0

0

1

1.65V

0

1

0

0

0

1.60V

0

0

1

1

1

1.55V

0

0

1

1

0

1.50V

0

0

1

0

1

1.45V

0

0

1

0

0

1.40V

0

0

0

1

1

1.35V

0

0

0

1

0

1.30V

0

0

0

0

1

1.25V

0

0

0

0

0

1.20V

18

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