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AAT2687 Datasheet Preview

AAT2687 Datasheet

PMIC Solution

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DATA SHEET
AAT2687
PMIC Solution for 24V Systems
with 2 High Performance Step-Down Converters
General Description
The AAT2687 provides two independently regulated DC
outputs; consisting of a high voltage step-down regula-
tor and a low input voltage low dropout (LDO) regulator.
The PMIC is optimized for low-cost 12V adapter inputs,
making the device the ideal system-on-a-chip power
solution for consumer communications equipment.
Channel 1 is a step-down regulator with an input voltage
range 6.0 to 24V, providing up to 4.5A output current.
490kHz fixed switching frequency allows small L/C filter-
ing components. Channel 1 utilizes voltage mode control
configured for optimum performance across the entire
output voltage and load range.
Channel 2 is a low-dropout (LDO) regulator providing up
to 600mA output current. The device provides extremely
low output noise, low quiescent current and excellent
transient response.
The controller includes integrated cycle-by-cycle over-
current protection, soft-start and over-temperature dis-
able features. Independent input and enable pins pro-
vide maximum design flexibility.
The AAT2687 is available in the Pb-free, 4x5mm 24-pin
TQFN package. The rated operating temperature range is
-40C to 85C.
Features
• 2-Output Step-Down Converters:
Channel 1 Step-Down: VIN1 = 6V to 24V
VOUT1 Adjustable from 1.5V to 5.5V
IOUT1 up to 4.5A
• High Switching Frequency
• Voltage Mode Control
• PWM Fixed Frequency for Low-Ripple
Channel 2 (LDO): VIN2 = 2.7V to 5.5V
IOUT2 up to 600mA
• 1V Dropout Voltage at 600mA
• High Accuracy ±1.5%
• Small Solution Size
System On a Chip
Ultra-small External L/C
• Shutdown Current <35μA
• Independent Enable Pins
• Programmable Over-Current Protection
• Over-Temperature Protection
• Internal Soft Start
• 4x5mm 24-Pin TQFN Low Profile Thermally Enhanced
Package
• -40°C to 85°C Temperature Range
Applications
• DSL and Cable Modems
• Notebook Computers
• Satellite Settop Box
• Wireless LAN Systems
Typical Application
VIN1
6.0V - 24.0V
J1 2
1
C3
0.1µF
D1
BAS16
C14
2.2µF
+ C1
220µF
25V
VIN2
C13
1µF
25V
C2
2.2µF
LX1
BST
VL1 RS1
OS1
IN1 FB1
L1
4.7µH 5.3A
D2
R2 C4
2k 220nF
C10
2.2nF
R5
450
VOUT1
3.3V/4.5A
R3
8.87k
C7 C8 C9
22µF 22µF 22µF
COMP1
AAT2687
EN1
OUT2
IN2
EN2 GND
TQFN45-24
R1 C5
3.92K 2.2nF
C6
VOUT2 150pF
1.8V/600mA
R4
1.96k
C12
2.2µF
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202033A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • June 8, 2012
1




Skyworks

AAT2687 Datasheet Preview

AAT2687 Datasheet

PMIC Solution

No Preview Available !

DATA SHEET
AAT2687
Pin Descriptions
PMIC Solution for 24V Systems
with 2 High Performance Step-Down Converters
Pin #
1
2
3, 4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
EP
Symbol
LX1
LX1
N/C
BST1
EN1
GND2
EN2
N/C
IN2
OUT2
N/C
RS1
OS1
COMP1
FB1
GND1
VL1
VL1
N/C
N/C
IN1
LX1
LX1
EP
Function
Channel 1 step-down converter switching pin. Connect output inductor to this pin. Connect all four LX1 pins
together.
Channel 1 step-down converter switching pin. Connect output inductor to this pin. Connect all four LX1 pins
together.
No Connect. Can be used to route IN1 and EP.
Channel 1 step-down regulator boost drive input pin. Connect the cathode of fast rectier from this pin and
connect a 100nF capacitor from this pin to the channel 1 switching node (LX1) for internal high-side MOSFET
gate drive.
Channel 1 step-down regulator enable input pin. Active high enables the channel 1 output. It can be tied to VIN1.
Ground pin for Channel 2. Power return pin for channel 2. Connect return of channel 2 input and output ca-
pacitors close to this pin for best noise performance.
Channel 2 linear low dropout (LDO) enable input pin. Active high enables the channel 2 output. It can be tied
to VOUT1.
No Connect. Can be used to route IN2.
Input supply voltage pin for channel 2 linear low dropout (LDO) regulator. Connect 2.2μF ceramic input ca-
pacitor close to this pin.
Output of channel 2 of linear low dropout (LDO) regulator. Connect a 2.2μF ceramic capacitor from this pin to
GND pin.
No Connect. Can be used to route OUT2.
Channel 1 output current sense pin. Connect a small signal resistor from this pin to channel 1 switching node
(LX) to enable over-current sense for step-down converter.
Channel 1 output sense voltage pin. Connect to the output capacitor to enable over-current sense for step-
down converter.
Compensation pin for channel 1 step-down regulator. Connect a series resistor, capacitor network to compen-
sate the voltage mode control loop.
Feedback input pin for channel 1 step-down converter. Connect an external resistor divider to this pin to pro-
gram the output voltage to the desired value.
Ground pin for Channel 1. Power return pin for channel 1. Connect return of channel 1 input and output ca-
pacitors close to this pin for best noise performance.
Internal linear regulator for channel 1 step-down converter. Connect a 2.2μF/6.3V capacitor from this pin to
GND1 pin.
Internal linear regulator for channel 1 step-down converter. Connect to pin 18.
No Connect. Do not connect to any node on the PCB.
No Connect. Can be connected to GND.
Input supply voltage pin for channel 1 step-down regulator. Connect both IN1 pins together. Connect the input
capacitor close to this pin for best noise performance.
Channel 1 step-down converter switching pin. Connect output inductor to this pin. Connect all four LX1 pins
together.
Channel 1 step-down converter switching pin. Connect output inductor to this pin. Connect all four LX1 pins
together.
Exposed paddle tied to IN1. Connect to PCB heatsink for optimum thermal performance of internal LDO device.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
2 202033A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • June 8, 2012


Part Number AAT2687
Description PMIC Solution
Maker Skyworks
Total Page 20 Pages
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