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LM3670MFX-1.2 数据表(PDF) 10 Page - Texas Instruments

部件名 LM3670MFX-1.2
功能描述  Miniature Step-Down DC-DC Converter for Ultralow Voltage Circuits
Download  28 Pages
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制造商  TI1 [Texas Instruments]
网页  http://www.ti.com
标志 TI1 - Texas Instruments

LM3670MFX-1.2 数据表(HTML) 10 Page - Texas Instruments

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1 MHz
Oscillator
Soft
Start
Ramp
Generator
+
-
Thermal
Shutdown
Undervoltage
Lockout
VREF
+
-
0.5V
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
Frequency
Compensation
Adj Version
Fixed Version
10
LM3670
SNVS250F – NOVEMBER 2004 – REVISED FEBRUARY 2016
www.ti.com
Product Folder Links: LM3670
Submit Documentation Feedback
Copyright © 2004–2016, Texas Instruments Incorporated
7 Detailed Description
7.1 Overview
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 can 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 current required: pulse width modulation (PWM), pulse
frequency modulation (PFM), and shutdown. PWM mode handles current loads of approximately 70 mA or
higher. Lighter output current loads cause the device to automatically switch into PFM for reduced current
consumption (IQ = 15 µA typical) and a longer battery life. Shutdown mode turns off the device, offering the
lowest current consumption (ISHUTDOWN = 0.1 µA typical).
The LM3670 can operate up to a 100% duty cycle (PMOS switch always on) for low dropout control of the output
voltage. In this way the output voltage is controlled down to the lowest possible input voltage.
Additional features include soft-start, undervoltage lockout, current overload protection, and thermal overload
protection. As shown in Figure 17, only three external power components are required for implementation.
7.2 Functional Block Diagram


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