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LM3677 Datasheet(PDF) 6 Page - Texas Instruments

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Part # LM3677
Description  3MHz, 600mA Miniature Step-Down DC-DC Converter for Ultra Low Voltage Circuits
PDF  30 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

LM3677 Datasheet(HTML) 6 Page - Texas Instruments

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3 MHz
Oscillator
Soft
Start
Ramp
Generator
Thermal
Shutdown
Undervoltage
Lockout
Frequency
Compensation
+
-
Error
Amp
Control Logic
Driver
Current Limit
Comparator
Ref1
PFM Current
Comparator
Ref2
SW
Zero Crossing
Comparator
FB
EN
VIN
PWM Comparator
pfm_low
pfm_hi
GND
Bandgap
+
-
Vcomp
1.0V
Fixed Ver
+
-
0.5V
+
-
+
-
VREF
LM3677
SNVS502E – MARCH 2007 – REVISED OCTOBER 2008
www.ti.com
DISSIPATION RATING TABLE
θJA
TA≤ 25°C
TA= 60°C
TA= 85°C
Power Rating
Power Rating
Power Rating
85°C/W (4-layer board)
1178 mW
785 mW
470 mW
micro SMD
117°C/W (4-layer board)
855 mW
556 mW
342 mW
LLP
BLOCK DIAGRAM
Figure 7. Simplified Functional Diagram
6
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Copyright © 2007–2008, Texas Instruments Incorporated
Product Folder Links: LM3677



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