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LM3670MFX-3.3 Datasheet(PDF) 10 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part # LM3670MFX-3.3
Description  Miniature Step-Down DC-DC Converter for Ultra Low Voltage Circuits
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM3670MFX-3.3 Datasheet(HTML) 10 Page - National Semiconductor (TI)

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Typical Performance Characteristics (unless otherwise stated: V
IN=3.6V, VOUT=1.8V) (Continued)
PFM Mode
V
SW,VOUT,IINDUCTOR vs. Time
PWM Mode
V
SW,VOUT,IINDUCTOR vs. Time
20075822
20075823
Soft Start
V
IN,VOUT,IINDUCTOR vs. Time
(I
LOAD = 350mA)
20075824
Operation Description
DEVICE INFORMATION
The LM3670, a high efficiency step down DC-DC switching
buck converter, delivers a constant voltage from either a
single Li-Ion or three cell NiMH/NiCd battery to portable
devices such as cell phones and PDAs. Using a voltage
mode
architecture
with
synchronous
rectification,
the
LM3670 has the ability to deliver up to 350 mA depending on
the input voltage and output voltage (voltage head room),
and the inductor chosen (maximum current capability).
There are three modes of operation depending on the cur-
rent required - PWM, PFM, and shutdown. PWM mode
handles current loads of approximately 70 mA or higher.
Lighter output current loads cause the device to automati-
cally switch into PFM for reduced current consumption (I
Q =
15 µA typ) and a longer battery life. Shutdown mode turns off
the
device,
offering
the
lowest
current
consumption
(I
Q, SHUTDOWN = 0.1 µA typ).
The LM3670 can operate up to a 100% duty cycle (PMOS
switch always on) for low drop out control of the output
voltage. In this way the output voltage will be controlled
down to the lowest possible input voltage.
Additional features include soft-start, under voltage lock out,
current overload protection, and thermal overload protection.
As shown in Figure 1, only three external power components
are required for implementation.
CIRCUIT OPERATION
The LM3670 operates as follows. During the first portion of
each switching cycle, the control block in the LM3670 turns
on the internal PFET switch. This allows current to flow from
the input through the inductor to the output filter capacitor
and load. The inductor limits the current to a ramp with a
slope of
by storing energy in a magnetic field. During the second
portion of each cycle, the controller turns the PFET switch
www.national.com
10


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