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LM3678 Datasheet(PDF) 3 Page - Texas Instruments

No. de pieza LM3678
Descripción Electrónicos  High-Performance Miniature 1.5-A Step-Down DC-DC Converter for Handheld Applications
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Fabricante Electrónico  TI [Texas Instruments]
Página de inicio  http://www.ti.com
Logo TI - Texas Instruments

LM3678 Datasheet(HTML) 3 Page - Texas Instruments

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1
2
3
4
7
8
9
10
GND
GND
SW
VDD
FB
EN
PWM
PGOOD
5
6
VDD
VSELECT
D
A
P
GND
FB
SW
VDD
VDD
9
8
7
6
1
2
3
4
5
GND
EN
PWM
PGOOD
VSELECT
10
D
A
P
LM3678
www.ti.com
SNVS464C – APRIL 2008 – REVISED MAY 2013
Connection Diagram and Package Mark Information
Figure 4. Top View
Figure 5. Bottom View
Table 1. Pin Descriptions
Pin
Name
Description
No.
1
GND
Power Ground pin.
2
GND
Analog Ground Pin
3
SW
Switching node connection to the internal PFET switch and NFET synchronous rectifier
4
VDD
Analog supply input. Connect to the input filter capacitor (see Figure 1).
5
VDD
Power supply Input. Connect to the input filter capacitor (see Figure 1).
6
VSELECT
Output voltage select (For example)
VSELECT = LOW, VOUT = 0.8V
VSELECT = HIGH , VOUT = 1.2V
7
PGOOD
Power Good Flag. This common drain logic output is pulled to ground when the output voltage is not within
±7.5% of regulation.
8
PWM
Connect PWM pin to VIN.
9
EN
Enable pin. The device is in shutdown mode when voltage to this pin is <0.4V and enabled when >1.0V. Do not
leave this pin floating.
10
FB
Feedback analog input. Connect directly to the output filter capacitor for fixed voltage versions.
DAP
DAP
Die Attach Pad, connect the DAP to GND on PCB layout to enhance thermal performance. It should not be used
as a primary ground connection.
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.
Absolute Maximum Ratings
(1)
VIN Pin: Voltage to GND
−0.2V to 6.0V
EN Pin
−0.2V to 6.0V
FB, SW Pin
(GND
−0.2V) to (VIN + 0.2V)
Continuous Power Dissipation(2)
Internally Limited
Junction Temperature (TJ-MAX)
+150°C
Storage Temperature Range
−65°C to +150°C
Maximum Lead Temperature (Soldering, 10 seconds)
260°C
(1)
Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings are conditions under
which the device operates. Operating Ratings do not imply specified performance limits. For specified performance limits and associated
test conditions, see the Electrical Characteristics.
(2)
Internal thermal shutdown circuitry protects the device from permanent damage. Thermal shutdown engages at TJ= 150°C (typ) and
disengages at TJ= 130°C (typ).
Copyright © 2008–2013, Texas Instruments Incorporated
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