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LM25085MYE Fiches technique(PDF) 2 Page - Texas Instruments

No de pièce LM25085MYE
Description  LM25085, LM25085-Q1 42V Constant On-Time PFET Buck Switching Controller
Download  30 Pages
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Fabricant  TI1 [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI1 - Texas Instruments

LM25085MYE Fiches technique(HTML) 2 Page - Texas Instruments

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1
2
3
4
5
8
7
6
FB
PGATE
ISEN
GND
VCC
ADJ
RT
VIN
8
7
6
5
4
3
2
1
Exposed Pad on Bottom
Connect to Ground
FB
GND
ADJ
PGATE
ISEN
VCC
RT
VIN
1
2
3
4
5
8
7
6
Exposed Pad on Bottom
Connect to Ground
FB
PGATE
ISEN
GND
VCC
ADJ
RT
VIN
LM25085, LM25085-Q1
SNVS593H – OCTOBER 2008 – REVISED MARCH 2013
www.ti.com
Connection Diagram
Figure 1. Top View
8-Lead HVSSOP-PowerPAD
Figure 3. Top View
See Package Number DGN0008A
8-Lead WSON
See Package Number NGQ0008A
Figure 2. Top View
8-Lead VSSOP
See Package Number DGK0008A
PIN DESCRIPTIONS
Pin
Name
Description
Application Information
No.
1
ADJ
Current Limit Adjust
The current limit threshold is set by an external resistor from VIN to ADJ in
conjunction with the external sense resistor or the PFET’s RDS(ON).
2
RT
On-time control and shutdown
An external resistor from VIN to RT sets the buck switch on-time and switching
frequency. Grounding this pin shuts down the controller.
3
FB
Voltage Feedback from the
Input to the regulation and over-voltage comparators. The regulation level is 1.25V.
regulated output
4
GND
Circuit Ground
Ground reference for all internal circuitry
5
ISEN
Current sense input for current
Connect to the PFET drain when using RDS(ON) current sense. Connect to the PFET
limit detection.
source and the sense resistor when using a current sense resistor.
6
PGATE
Gate Driver Output
Connect to the gate of the external PFET.
7
VCC
Output of the gate driver bias
Output of the negative voltage regulator (relative to VIN) that biases the PFET gate
regulator
driver. A low ESR capacitor is required from VIN to VCC, located as close as
possible to the pins.
8
VIN
Input supply voltage
The operating input range is from 4.5V to 42V. A low ESR bypass capacitor must be
located as close as possible to the VIN and GND pins.
EP
Exposed Pad
Exposed pad on the underside of the package (HVSSOP-PowerPAD-8 and WSON
only). This pad is to be soldered to the PC board ground plane to aid in heat
dissipation.
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.
2
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Copyright © 2008–2013, Texas Instruments Incorporated
Product Folder Links: LM25085 LM25085-Q1


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