LM3537_13 Datasheet, PDF (18/33 Pages) Texas Instruments – 8-Channel WLED Driver with Four Integrated LDOs

LM3537
SNVS634B – JUNE 2011 – REVISED MAY 2013
www.ti.com
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).
LDOX_VOUT[4]
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Table 4. Regulator Voltage Options
LDOX_VOUT[3]
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
LDOX_VOUT[2]
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
LDOX_VOUT[1]
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
LDOX_VOUT[0]
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
Output Voltage
(typ.)
3.30V
3.20V
3.10V
3.00V
2.95V
2.90V
2.85V
2.80V
2.75V
2.70V
2.65V
2.60V
2.55V
2.50V
2.40V
2.20V
2.00V
1.90V
1.85V
1.80V
1.75V
1.70V
1.65V
1.60V
1.55V
1.50V
1.45V
1.40V
1.35V
1.30V
1.25V
1.20V
18
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