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LM3477 データシート(PDF) 2 Page - Texas Instruments

部品番号 LM3477
部品情報  High Efficiency High-Side N-Channel Controller for Switching Regulator
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メーカー  TI1 [Texas Instruments]
ホームページ  http://www.ti.com
Logo TI1 - Texas Instruments

LM3477 データシート(HTML) 2 Page - Texas Instruments

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ISEN
FB
GND
VIN
CB
SW
DR
LM3477
COMP/SD
CBYP
0.1PF
CBOOT
0.1PF
CSN
0.1PF
DR
FB
CB
SW
GND
VIN
ISEN
LM3477
*RFB1 = RFB2
* (Vout - 1.26)/1.26
1
2
3
4
5
6
7
8
VIN
4.5V - 5.5V
CIN
120PF/20V
RSN
0.02:
Q1
FDC653N
D
30BG100
L
3.3PH
VOUT
2.5V, 3A
RFB1
20.5k
RFB2
20.0k
RC
510
CC1
47nF
COUT
47PF
ceramic
COMP/SD
LM3477
SNVS141J – MAY 2004 – REVISED JULY 2004
www.ti.com
Typical Application Circuit
Figure 1. Typical High Efficiency Step-Down (Buck) Converter
Connection Diagram
Figure 2. 8 Lead Mini SO8 Package (MSOP-8 Package)
Pin Functions
Pin Description
Pin Name
Pin Number
Description
ISEN
1
Current sense input pin. Voltage generated across an external sense resistor is fed into this
pin.
COMP/SD
2
Compensation pin. A resistor-capacitor combination connected to this pin provides
compensation for the control loop. Pull this pin below 0.65V to shutdown.
FB
3
Feedback pin. The output voltage should be adjusted using a resistor divider to provide
1.270V at this pin.
GND
4
Ground pin.
SW
5
Switch Node. Source of the external MOSFET is connected to this node.
DR
6
Drive pin. The gate of the external MOSFET should be connected to this pin.
CB
7
Boot-strap pin. A capacitor must be connected between this pin and SW pin (pin 5) for proper
operation. The voltage developed across this capacitor provides the gate drive for the external
MOSFET.
VIN
8
Power Supply Input pin.
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 © 2004, Texas Instruments Incorporated
Product Folder Links: LM3477


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