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LM3686 Datasheet(PDF) 4 Page - Texas Instruments

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Part No. LM3686
Description  Step-Down DC-DC Converter with Integrated Post Linear Regulators System and Low-Noise Linear Regulator
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

LM3686 Datasheet(HTML) 4 Page - Texas Instruments

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1.8V
VOUT-DCDC
0V
VOUT-LILO
FET OF LILO (SMALL NMOS)
IOUT-LILO 7 50 mA
IOUT-LILO > 50 mA
LARGE NMOS
(SMALL NMOS TO LARGE NMOS TRANSITION)
0V
1.2V
LM3686
SNVS520E – AUGUST 2008 – REVISED MAY 2013
www.ti.com
Enable Combinations
EN_DCDC
EN_LILO
EN_LDO
Function
0
0
0
No Outputs
0
0
1
Linear Regulator enabled only (EN_LDO), supply from VIN_LDO, IOUT_MAX = 300
mA
0
1
0
Linear Regulator enabled only LILO supplies from VIN_LDO,
IOUT_MAX = 50 mA, VIN_LDO > = VOUT_LILO
1
0
0
DC-DC converter enabled only
1
1
0
Linear Regulator & DCDC enabled
1) VIN_LILO < VOUT_LILO + 150 mV (typ.), the small NMOS device is active (IMAX
= 50 mA) and supplied by VIN_LDO.
2) If VIN_LILO > VOUT_LILO + 250 mV (typ.), the large NMOS device is active (IMAX
= 350 mA) and supplied by VIN_LILO. Maxium current of DC-DC when EN_LILO =
High is 250 mA(1)(2)
1
1
1
DC-DC converter and linear regulator active.
Linear regulator starts after DC-DC converter.
(1)
The LILO is turned on via a small NMOS device supplied by VIN_LDO . The maximum current is 50 mA when this small NMOS is ON. If
higher current > 50 mA is desired the following condition must be done: EN_DC = HIGH .
(2)
When the switcher is enabled, a transition occurs from the small NMOS to a larger NMOS. The transition occurs when VIN_LILO >
VOUT_LILO + 250 mV. If VIN_LILO < VOUT_LILO + 150 mV, the LILO switches back to small NMOS (Switcher EN = low).
Figure 4. Mode Transition
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.
4
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Copyright © 2008–2013, Texas Instruments Incorporated
Product Folder Links: LM3686


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