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AAT2688 Datasheet Preview

AAT2688 Datasheet

4.5A PMIC Solution

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DATA SHEET
AAT2688
4.5A PMIC Solution for 12V Adapter Systems
with 2-Output High Performance Step-Down Converters
General Description
The AAT2688 provides two independently regulated DC
outputs: a high voltage synchronous step-down (Buck)
regulator and a low input voltage step-down 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 of 6.0V to 24V, providing up to 4.5A output cur-
rent. 490kHz fixed switching frequency allows small L/C
filtering 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 low out-
put noise, low quiescent current, and excellent transient
response.
The step-down regulator includes integrated over-cur-
rent, soft-start and over-temperature protection. Inde-
pendent input and enable pins provide maximum design
flexibility.
The AAT2688 is available in the Pb-free 4mm x 5mm
24-pin TQFN package. The rated operating temperature
range is -40°C to 85°C.
Features
• 2-Output Step-Down Converters:
Channel 1 (Buck): VIN1 = 6.0 to 24.0V
VOUT1 Adjustable from 0.8V to 5.5V
IOUT1 up to 4.5A
High Switching Frequency
Voltage Mode Control
High Accuracy ±1.5%
PWM Fixed Frequency for Low Ripple
Channel 2 (LDO): VIN2 = 2.7V to 5.5V
IOUT2 up to 600mA
1V Dropout Voltage at 600mA IOUT
• Small Solution Size
• System on a Chip
• Ultra-small External L/C
• Shutdown Current <35μA
• Independent Enable Pins
• Over-Current and Over-Temperature Protection
• Internal Soft Start
• 4x5mm 24-Pin TQFN Low Profile Package
• -40°C to 85°C Temperature Range
Applications
• DSL and Cable Modems
• Notebook Computers
• Satellite Set-top Boxes
• Wireless LAN Systems
Typical Application
C3
0.1μF
D1
BAS16
J1 2
VIN1
1
6.0V -24.0V
C14
2.2μF
+ C1
220μF
25V
VIN2
C13
1μF
25V
C2
2.2μF
L1 4.7μH/5.3A
LX1
BST1 DL
VL1 RS1
OS1
IN1 FB1
Q1 C10
R2 C4
2.2nF
2K 220nF
R5
150
COMP1
AAT2688
R1
3.92k
C5
2.2nF
EN1
IN2 OUT2
C6
150pF
VOUT2
EN2 GND
C12
2.2μF
TQFN45-24
VOUT1
3.3V/4.5A
R3
9.09k
C7 C8
22μF 22μF
C9
22μF
R4
1.96k
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202034A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • June 8, 2012
1




Skyworks

AAT2688 Datasheet Preview

AAT2688 Datasheet

4.5A PMIC Solution

No Preview Available !

DATA SHEET
AAT2688
Pin Descriptions
4.5A PMIC Solution for 12V Adapter Systems
with 2-Output High Performance Step-Down Converters
Pin #
1, 2, 23, 24
3, 4, 9, 12
5
6
7
8
10
11
13
14
15
16
17
18, 19
20
21
22
EP
Symbol
LX1
N/C
BST1
EN1
GND2
EN2
IN2
OUT2
RS1
OS1
COMP1
FB1
GND1
VL1
DL1
PGND
IN1
EP
Function
Channel 1 step-down (Buck) converter switching pin. Connect output inductor to this pin. Connect both
LX1 pins together.
No connect. For optional routing reasons, pins 3 and 4 can be connected to VIN, pin 9 to pin 10 (IN2),
and pin 12 to pin 11 (OUT2).
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 hi-side
MOSFET gate drive.
Channel 1 step-down regulator enable input pin. Active high enables internal linear regulator and chan-
nel 1 output.
Ground pin for Channel 2. Power return pin for channel 2. Connect return of channel 2 input and output
capacitors close to this pin for best noise performance.
Channel 2 low dropout (LDO) enable input pin. Active high.
Input supply voltage pin for channel 2 linear low dropout (LDO) regulator. Connect 2.2μF ceramic input
capacitor 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.
Channel 1 output current sense pin. Connect a small signal resistor from this pin to switching node
(LX1) to enable over-current sense for step-down converter. The current limit threshold varies with
sense resistor sizing.
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
compensate the voltage mode control loop.
Feedback input pin for channel 1 step-down converter. Connect an external resistor divider to this pin to
program 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
capacitors close to this pin for best noise performance.
Internal linear regulator. Connect a 2.2μF capacitor from this pin to GND pin.
Channel 1 gate drive for low side MOSFET. Connect to the gate pin of an external N type MOSFET (see
the "MOSFET Selection" section of this product datasheet).
Ground pin for both channels. Power return pin for both channels. Connect returns of both channels’
input and output capacitors close to this pin for best noise performance.
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.
Exposed Paddle. Tie to IN1. Connect to PCB heatsink for optimum thermal performance.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
2 202034A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • June 8, 2012


Part Number AAT2688
Description 4.5A PMIC Solution
Maker Skyworks
Total Page 20 Pages
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