AAT2603 Datasheet PDF - Advanced Analogic Technologies

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AAT2603
Advanced Analogic Technologies

Part Number AAT2603
Description Total Power Solution
Page 26 Pages


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PRODUCT DATASHEET
AAT2603
Total Power Solution for Portable Applications
General Description
The AAT2603 is a highly integrated power management
solution for handheld mobile systems. It provides six
regulated voltages from a single-cell Lithium-ion/poly-
mer battery or a 5V supply.
The six outputs are produced by six regulators; two
switching step-down regulators and four low-dropout
(LDO) regulators. Each voltage regulator has its own
independent enable pin.
The high efficiency step-down regulators are fully inte-
grated and switch at a high 1.5 MHz fixed frequency.
They automatically transition to variable frequency
operation at light loads for improved efficiency. DC-DC1
(Buck1) is designed for high output current and low
dropout voltage (200mV at 1.2A). DC-DC2 (Buck2) is a
600mA regulator with a two step dynamic output voltage
capability. One option allows the output voltage of
DC-DC2 (Buck2) to be set to either 1.0V or 1.3V with the
SELB2 logic pin.
LDO regulators LDO1 and LDO2 can supply up to 400mA
of load current with output voltages adjustable down to
1.5V. LDO regulators LDO3 and LDO4 can supply up to
200mA of current and provide good noise and power sup-
ply rejection. LDO3 and LDO4 have output voltages exter-
nally adjustable down to 1.2V.
The AAT2603 is available in a Pb-free thermally enhanced
28-pin TQFN44 package and is rated for operation over
the -40°C to +85°C temperature range.
Features
VIN Range: 2.7V to 5.5V
• Two Step-Down Regulators
DC-DC1(Buck1): 1.2A, Low Dropout Voltage
Externally Adjustable: VFBB1 = 0.6V
VOUT Range: 0.6V to VINB1
Fixed: VOUT = 3.3V
Factory Programmable to any Two Voltage
Levels from 0.6V to 4.0V
• DC-DC2(Buck2): 0.6A, Low Dropout Voltage
Externally Adjustable: VFBB2 = 0.6V
VOUT Range: 0.6V to VINB2
Fixed: VOUT = 1.0V[SELB2=’0’]/1.3V[SELB2=’1’]
Factory Programmable to any Two Voltage
Levels from 0.6V to 4.0V
Fixed 1.5MHz Switching Frequency
Internally Compensated Current Mode Control
High Efficiency over the Entire Load Range
Four LDO Regulators
• LDO1: 400mA LDO
• LDO2: 400mA LDO
• LDO3: 200mA, Low Noise LDO
• LDO4: 200mA, Low Noise LDO
• Fast Turn-On and Turn-Off time
• Short Circuit and Over-Current Protection
• Over-Temperature Protection
• Temperature Range: -40°C to +85°C
• TQFN44-28 Package
Applications
• Handheld GPS
• Handheld Instruments
• PDAs and Handheld Computers
• Portable Media Players
• Smart Phones
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Typical Application Circuit
PRODUCT DATASHEET
AAT2603
Total Power Solution for Portable Applications
2.7V to 5.5V
CINB1
4.7μF
INB 1
CINB2
4.7μF
INB 2
CAIN
2.2μF
AIN
CINL12
2.2μF
INL 12
CINL34
2.2μF
INL 34
ENB 1
ENB 2
ENL 1
LX 1
FBB 1
LX 2
FBB 2
L1
3.3μH
L2
1.2μH
OUTL 1
AAT2603
FBL 1
100 kΩ
OUTL 2
FBL 2
100kΩ
OUTL 3
ENL 2
ENL 3
FBL 3
100kΩ
ENL 4
OUTL 4
CBYP
10nF
SELB 2
BYP
AGND
PGND 1
FBL 4
100kΩ
PGND2
3.3V: 1.2A
COUTB1
22μF
1.0V & 1.3V: 600mA
COUTB2
10μF
1.5V (Minimum): 400mA
COUTL1
4.7μF
1.5V (Minimum): 400mA
COUTL2
4.7μF
1.2V (Minimum): 200mA
COUTL3
4.7μF
1.2V (Minimum): 200mA
COUTL4
4.7μF
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PRODUCT DATASHEET
AAT2603
Total Power Solution for Portable Applications
Pin Descriptions
Pin #
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Symbol
LX2
ENB2
FBB2
ENL3
AGND
FBL3
OUTL3
INL34
OUTL4
FBL4
ENL4
BYP
ENL1
FBL1
OUTL1
INL12
OUTL2
FBL2
ENL2
AIN
21 FBB1
22 ENB1
23 SELB2
24 LX1
25 PGND1
26 INB1
27 INB2
28 PGND2
EP
Function
DC-DC2 (Buck2) switching node. Connect the output inductor to LX2. Connected internally to the
drains o f both high-side and low-side switches.
DC-DC2 (Buck2) enable input. Active high.
DC-DC2 (Buck2) feedback input. For externally adjustable versions, connect a resistor divider
from Buck2 output to FBB2 to AGND to set the Buck2 output voltage.
LDO3 enable input. Active high.
Analog ground. Connect AGND to PGND1 and PGND2 as close as possible to the device.
LDO3 feedback input. Connect a resistor divider from OUTL3 to FBL3 to AGND to set the LDO3
output voltage.
LDO3 output. Should be closely decoupled to AGND with a 4.7μF or greater capacitor.
LDO3 and LDO4 input. Should be closely decoupled to AGND with a 2.2μF or greater capacitor.
LDO4 output. Should be closely decoupled to AGND with a 4.7μF or greater capacitor.
LDO4 feedback input. Connect a resistor divider from OUTL4 to FBL4 to AGND to set the LDO4
output voltage.
LDO4 enable input. Active high.
Reference Bypass. Bypass BYP to AGND with a 0.01μF or greater capacitor to reduce the LDO1
output noise.
LDO1 enable input. Active high.
LDO1 feedback input. Connect a resistor divider from OUTL1 to FBL1 to AGND to set the LDO1
output voltage.
LDO1 output. Should be closely decoupled to AGND with a 4.7μF or greater capacitor.
LDO1 and LDO2 input. Should be closely decoupled to AGND with a 2.2μF or greater capacitor.
LDO2 output. Should be closely decoupled to AGND with a 4.7μF or greater capacitor.
LDO2 feedback input. Connect a resistor divider from OUTL2 to FBL2 to AGND to set the LDO2
output voltage.
LDO2 enable input. Active high.
Analog voltage input. AIN is the bias supply for the device. Should be closely decoupled to AGND
with a 2.2μF or greater capacitor.
DC-DC1 (Buck1) feedback input. For externally adjustable versions, connect a resistor divider
from Buck1 output to FBB1 to AGND to set the Buck1 output voltage.
DC-DC1 (Buck1) enable input. Active high.
Dynamically adjusts the output voltage of DC-DC2 (Buck2) (Logic High=1.3V, Logic Low=1.0V)
DC-DC1 (Buck1) switching node. Connect the output inductor to LX1. Connected internally to the
drains of both high-side and low-side switches.
DC-DC1 (Buck1) power ground. Connected internally to the source of the Buck1 N-channel syn-
chronous rectier. Connect PGND1 to PGND2 and AGND as close as possible to the device.
DC-DC1 (Buck1) power input. Connected internally to the source of the Buck1 P-channel switch.
Should be closely decoupled to PGND1 with a 4.7μF or greater capacitor.
DC-DC2 (Buck2) power input. Connected internally to the source of the Buck2 P-channel switch.
Should be closely decoupled to PGND2 with a 4.7μF or greater capacitor.
DC-DC2 (Buck2) power ground. Connected internally to the source of the Buck2 N-channel syn-
chronous rectier. Connect PGND2 to PGND1 and AGND as close as possible to the device.
Exposed paddle (bottom). Connect to ground as close as possible to the device.
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Pin Configuration
PRODUCT DATASHEET
AAT2603
Total Power Solution for Portable Applications
TQFN44-28
(Top View)
28 27 26 25 24 23 22
LX2 1
ENB2 2
FBB2 3
ENL3 4
AGND 5
FBL3 6
OUTL3 7
21 FBB1
20 AIN
19 ENL2
EP 18 FBL2
17 OUTL2
16 INL12
15 OUTL1
8 9 10 11 12 13 14
Part Number Descriptions
Part Number
AAT2603INJ-1-T1
AAT2603INJ-2-T1
AAT2603INJ-3-T1
Output Voltage1
DC-DC1 (Buck1)
Ext. Adj. (VFBB1 = 600mV)
3.3V
Ext. Adj. (VFBB1 = 600mV)
DC-DC2 (Buck2)
(SELB2 = Low)
Ext. Adj. (VFBB2 = 600mV)
1.0V
1.0V
DC-DC2 (Buck2)
(SELB2 = High)
Ext. Adj. (VFBB2 = 775mV)
1.3V
1.3V
LDOs 1-4
Ext. Adj. (VFBLX = 1.2V)
Ext. Adj. (VFBLX = 1.2V)
Ext. Adj. (VFBLX = 1.2V)
Absolute Maximum Ratings1
TA = 25°C unless otherwise noted.
Symbol
Description
INBX, INLXX, AIN to AGND
ENBX, ENLX, FBBX, FBLX, BYP to AGND
LX1 to PGND1
LX2 to PGND2
PGNDX to AGND, PGND1 to PGND2
Operating Temperature Range
Storage Temperature Range
Maximum Soldering Temperature (at leads, 10 sec)
Value
-0.3 to 6.0
-0.3 to VAIN+0.3
-0.3 to VINB1+0.3
-0.3 to VINB2+0.3
-0.3 to 0.3
-40 to 150
-65 to 150
300
Units
V
V
V
V
V
°C
°C
°C
Recommended Operating Conditions
Symbol
θJA
PD
Description
Thermal Resistance
Maximum Power Dissipation
Value
50
2
Units
°C/W
W
1. Stresses above those listed in Absolute Maximum Ratings may cause permanent damage to the device. Functional operation at conditions other than the operating conditions
specified is not implied. Only one Absolute Maximum rating should be applied at any one time.
4
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