AAT2510 Datasheet, PDF (8/19 Pages) Advanced Analogic Technologies – Dual 400mA, 1MHz Step-Down DC-DC Converter

Functional Block Diagram
FB1
DATA SHEET
AAT2510
Dual 400mA, 1MHz Step-Down DC/DC Converter
VIN1
EN1
DH
Comp.
Err.
Amp.
Voltage
Reference
Control
Logic
Logic
DL
LX1
GND1
SGND1
FB2
EN2
See
Note
DH
Comp.
Err.
Amp.
See
Note
Voltage
Reference
Control
Logic
Logic
DL
VIN2
LX2
GND2
SGND2
Note: Internal resistor divider included for ≥1.2V versions. For low voltage versions, the feedback pin is tied directly to the error amplifier input.
Operation
Device Summary
The AAT2510 is a constant frequency peak current mode
PWM converter with internal compensation. Each chan-
nel has independent input, enable, feedback, and ground
pins with non-synchronized 1MHz clocks.
Both converters are designed to operate with an input
voltage range of 2.7V to 5.5V. The output voltage ranges
from 0.6V to the input voltage for the internally fixed
version and up to 2.5V for the externally adjustable ver-
sion. The 0.6V fixed model shown in Figure 1 is also the
adjustable version and is externally programmable with
a resistive divider as shown in Figure 2. The converter
MOSFET power stage is sized for 400mA load capability
with up to 96% efficiency. Light load efficiency exceeds
80% at a 500μA load.
Soft Start
The AAT2510 soft-start control prevents output voltage
overshoot and limits inrush current when either the input
power or the enable input is applied. When pulled low, the
enable input forces the converter into a low-power, non-
switching state with a bias current of less than 1μA.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [e-mail] • www.skyworksinc.com
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202020B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 19, 2013