AAT2610_12 Datasheet, PDF (23/31 Pages) Skyworks Solutions Inc. – Seven-Channel PMU for Digital Still Cameras

DATA SHEET
AAT2610
Seven-Channel PMU for Digital Still Cameras
AAT2610
Synchronous Step-Up Converter
VOUT
5V
PV
VIN
L1
LX
R1
C2
432 kΩ
C1
FB
R2
59kΩ
PG
AAT2610
Non-Synchronous _L1
Step-Up Converter
D1
LX
FB
PG
VIN
C1
VOUT
15V
R1
C2
1.43MΩ
R2
59kΩ
(a) Synchronous step-up converter
(b) Non-synchronous step-up converter
Figure 2: Step-Up Converter with Output Voltage Programmed by External Resistor Divider.
V_OUT (V)
3.3
3.8
4.2
5.0
15
R2 = 59kΩ
R1 (kΩ)
267
316
357
432
1420
Table 2: Resistor Select for Step-up Converter
Output Voltage Setting.
Buck-Boost (Inverting) Converter
The AAT2610 has one inverting converter, AUX3. Figure
3 shows an AUX3 application circuit. Its programmed
output voltage can be set by the following equations:
-0.6V
V_OUT = _R2 · R1
R1
=
V_OUT
-0.6V
·
R2
AAT2610
Inverting converter
PVL3
LXL3
FBL3
REF
VIN
L1
C1
D1
VOUT
-7.5V
R1
C2
732kΩ
R2
59kΩ
C3
Figure 3: Buck/Boost (Inverting) Converter with
Output Voltage Programmed by External Resistor
Divider.
Inductor Selection
The AAT2610 can utilize small surface mount inductors
due to its fast 1.5MHz switching frequency. Optimized
inductor values for each channel keeps the seven chan-
nels stable, and achieves reduced output voltage ripple
at smaller output capacitor size. See Table 3 for recom-
mended inductors for each channel. A greater inductance
value will allow greater output current capability by
reducing inductor ripple current. Increasing the induc-
tance above 4.7µH will increase size to get enough satu-
ration current rating. The following equations show the
minimum saturation current of the selected inductors.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [e-mail] • www.skyworksinc.com
202208A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 25, 2012
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