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| LM3670_15 Datasheet, PDF (6/25 Pages) Texas Instruments – LM3670 Miniature Step-Down DC-DC Converter for Ultra Low Voltage Circuits | |||
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LM3670
SNVS250E â NOVEMBER 2004 â REVISED FEBRUARY 2013
www.ti.com
Electrical Characteristics (continued)
Limits in standard typeface are for TJ = 25°C. Limits in boldface type apply over the full operating junction temperature range
(â40°C ⤠TJ ⤠+125°C). Unless otherwise noted VIN = 3.6V, VOUT = 1.8V, IO = 150mA, EN = VIN
Symbol
Parameter
Condition
Min
Typ
Max
Units
IEN
FOSC
Enable (EN) Input Current
Internal Oscillator Frequency
PWM Mode
0.01
1
µA
550
1000
1300
kHz
EN
VIN
SW
Undervoltage
Ramp
Soft
Lockout
Generator
Start
Thermal
Shutdown
Bandgap
1 MHz
Oscillator
Current Limit
Comparator
Ref1
PFM Current
Comparator
Ref2
Error
Amp
PWM Comparator
+
-
VREF
0.5V +
-
Vcomp +
1.0V
-
pfm_low
pfm_hi
Control Logic
Adj Version
Fixed Version
FB
Frequency
Compensation
Driver
Zero Crossing
Comparator
GND
Figure 4. Simplified Functional Diagram
6
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