TLV62085_15 Datasheet, PDF (6/20 Pages) Texas Instruments – TLV62085 High Efficiency 3-A Step-Down Converter in 2-mm × 2-mm VSON Package

TLV62085
SLVSD63 – OCTOBER 2015
8 Detailed Description
www.ti.com
8.1 Overview
The TLV62085 synchronous step-down converter is based on the DCS-Control (Direct Control with Seamless
transition into Power Save Mode) topology. This is an advanced regulation topology that combines the
advantages of hysteretic, voltage, and current mode control schemes.
The DCS-Control topology operates in PWM (pulse width modulation) mode for medium to heavy load conditions
and in Power Save Mode at light load currents. In PWM mode, the converter operates with its nominal switching
frequency of 2.4 MHz, having a controlled frequency variation over the input voltage range. As the load current
decreases, the converter enters Power Save Mode, reducing the switching frequency and minimizing the IC's
current consumption to achieve high efficiency over the entire load current range. Because DCS-Control supports
both operation modes (PWM and PFM) within a single building block, the transition from PWM mode to Power
Save Mode is seamless and without effects on the output voltage. The device offers both excellent DC voltage
and superior load transient regulation, combined with very low output voltage ripple, minimizing interference with
RF circuits.
8.2 Functional Block Diagram
PG
V_FB
V_REF
Bandgap
EN
Undervoltage Lockout
400kΩ^{(1) Thermal Shutdown}
Hiccup
Counter
High Side
Current Sense
MOSFET Driver
Control Logic
Timer
ton
Ramp
Comparator
Direct Control
and
Compensation
Error Amplifier
V_REF
DCS - Control ^TM
EN
Note:
(1) When the device is enabled, the 400 kΩ resistor is disconnected.
Output Discharge
Logic
Figure 2. Functional Block Diagram
VIN
SW
GND
VOS
FB
260Ω
6
Submit Documentation Feedback
Product Folder Links: TLV62085
Copyright © 2015, Texas Instruments Incorporated