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LM3686 Datasheet(PDF) 3 Page - Texas Instruments

No. de pieza LM3686
Descripción Electrónicos  Step-Down DC-DC Converter with Integrated Post Linear Regulators System and Low-Noise Linear Regulator
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Fabricante Electrónico  TI1 [Texas Instruments]
Página de inicio  http://www.ti.com
Logo TI1 - Texas Instruments

LM3686 Datasheet(HTML) 3 Page - Texas Instruments

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D3
D2
A3
A2
D1
C1
A1
B1
C2
B2
C3
B3
A3
A2
D3
D2
A1
B1
C1
D1
C2
B2
C3
B3
LM3686
www.ti.com
SNVS520D – AUGUST 2008 – REVISED MARCH 2011
Connection Diagram
Figure 3. 12-pin micro SMD package
Pin Functions
Pin Descriptions
Pin Number
Symbol
Name and Function
A1
PGND
Power Ground pin
A2
SW
Switching node connection to the internal PFET switch and NFET synchronous rectifier.
A3
FB_DCDC
Feedback analog input for the DC-DC converter. Connect to the output filter capacitor.
B1
VBATT
Power supply input for switcher. Connect to the input filter capacitor.
B2
EN_LILO
Enable input for the linear regulator. The linear regulator is in shutdown mode if voltage at this pin is
< 0.4V and enabled if > 1.1V. Do not leave this pin floating.
B3
EN_DCDC
Enable input for the DC-DC converter. The DC-DC converter is in shutdown mode if voltage at this pin is <
0.4V and enabled if > 1.1V. Do not leave this pin floating.
C1
VIN_LDO
Input power to LDO. ( Must tie to VBATT at all times )
C2
EN_LDO
Enable input for the linear regulator. The linear regulator is in shutdown mode if voltage at this pin is
< 0.4V and enabled if > 1.1V. Do not leave this pin floating.
C3
QGND
Quiet GND pin for LDO and reference circuit.
D1
VOUT_LDO
Voltage output of the linear regulator.
D2
VOUT_LILO
Voltage output of the low input linear regulator
D3
VIN_LILO
Input power to LILO (VIN_LILO connects to output of DCDC or standalone).
Order Information
Part Number
Voltage Options
Package Marking
Supplied as
LM3686TL-AADW
1.81.22.8
¢2¢X*$I¢CSUEB
250 units, tape and reel
LM3686TLX-AADW
1.81.22.8
¢2¢X*$I¢CSUEB
3000 units, tape and reel
LM3686TLE-AAED
1.21.82.8
¢2¢X*$I¢CSUEB
250 units, tape and reel
LM3686TLX-AAED
1.21.82.8
¢2¢X*$I¢CSUEB
3000 units, tape and reel
LM3686TLE-AAEF
1.81.23.0
¢2¢X*$I¢CSUEB
250 units, tape and reel
LM3686TLX-AAEF
1.81.23.0
¢2¢X*$I¢CSUEB
3000 units, tape and reel
*Voltage options are read as follow: 1.81.22.8 = 1.8V for VOUT_DC-DC, 1.2V for VOUT_LILO, and 2.8V for
VOUT_LDO;
Contact National Semiconductor for other factory VOUT programmed options.
Table 1. 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
Copyright © 2008–2011, Texas Instruments Incorporated
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