12V, 1.5A Step-Down DC/DC Converter General Description AAT1162 8

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12V, 1.5A Step-Down DC/DC Converter General Description AAT1162 8

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AAT1162
12V, 1.5A Step-Down DC/DC Converter General Description
AAT1162 800kHz high efficiency stepdown DC/DC converter. With wide input voltage range 4.0V 13.2V, AAT1162 ideal choice dual-cell Lithium-ion battery-powered devices mid-power-range regulated 12V-powered industrial applications. internal power switches capable delivering 1.5A load. AAT1162 highly integrated device, simplifying system-level design. Minimum external components required converter. AAT1162 optimizes efficiency throughout entire load range. operates combination PWM/Light Load mode improved light-load efficiency. high switching frequency allows small external components. current shutdown feature disconnects load from drops shutdown current less than 1µA. AAT1162 available Pb-free, space-saving, thermally-enhanced 16-pin TDFN34 packageand rated over operating temperature range -40°C +85°C.
SwitchReg
Input Voltage Range: 4.0V 13.2V 1.5A Load Current Fixed Adjustable Output: Output Voltage: 0.6V 115µA No-Load Operating Current Less than Shutdown Current Efficiency Integrated Power Switches 800kHz Switching Frequency Soft Start Function Short-Circuit Over-Temperature Protection Minimum External Components TDFN34-16 Package Temperature Range: -40°C +85°C
Applications
Distributed Power Systems Industrial Applications Laptop Computers Portable Players Portable Media Players Set-Top Boxes Monitors HDTVs
Typical Application
Input: 4.0V 13.2V DGND
Output: 0.6V min, 1.5A
2.2µH
AAT1162
COUT 47µF
COMP
PGND AGND
1162.2007.09.1.2
AAT1162
12V, 1.5A Step-Down DC/DC Converter Descriptions
Symbol
Function
Power switching node. drain internal P-channel switch N-channel synchronous rectifier. Connect output inductor pins EP2. large exposed copper under package should used EP2. connected. Power source input. Connect input power source. Bypass DGND with 22µF greater capacitor. Connect both pins together close possible. additional 100nF ceramic capacitor should also connected between pins DGND, Exposed Digital Ground, DGND. exposed thermal (EP1) should connected board ground plane pins ground plane should include large exposed copper under package thermal dissipation (see package outline). Internal analog bias input. supplies internal power AAT1162. Connect input source voltage bypass AGND with 0.1µF greater capacitor. additional noise rejection, connect input power source through lower value resistor. Internal bypass node. output voltage internal bypassed LDO. internal circuitry AAT1162 powered from LDO. draw external power from LDO. Bypass AGND with greater capacitor. Output voltage feedback input. senses output voltage regulation control. fixed output versions, connect output voltage. adjustable versions, drive from output voltage through resistive voltage divider. regulation threshold 0.6V. Control compensation node. Connect series network from COMP AGND, 270pF. Analog signal ground. Connect AGND PGND single point close possible. Active high enable input. Drive high turn AAT1162; drive turn off. automatic startup, connect through 4.7k resistor. must biased high, biased low, driven logic level external source. float when device powered. Power ground. Connect AGND PGND single point close possible.
DGND
COMP AGND
PGND
Configuration
TDFN34-16 (Top View)
DGND
PGND DGND DGND AGND COMP
1162.2007.09.1.2
AAT1162
12V, 1.5A Step-Down DC/DC Converter Absolute Maximum Ratings1
Symbol
VIN, VAIN
Description
Input Voltage Voltage Voltage Voltage Operating Junction Temperature Range
Value
-0.3 -0.3 -0.3 -0.3
Units
Thermal Information3
Symbol
Description
Maximum Power Dissipation4 Thermal Resistance
Value
Units
°C/W
Stresses above those listed Absolute Maximum Ratings cause permanent damage device. Functional operation conditions other than operating conditions specified implied. Only Absolute Maximum Rating should applied time. Based long-term current density limitation. Mounted board. Derate 2.7mW/°C above 25°C. 1162.2007.09.1.2
AAT1162
12V, 1.5A Step-Down DC/DC Converter Electrical Characteristics1
4.0V 13.2V. COUT 22µF; 4.7µH, -40°C +85°C, unless otherwise noted. Typical values 25°C. Symbol
VUVLO ISHDN VOUT VOUT VOUT/ VOUT/VIN VOUT/ IOUT IFBLEAK FOSC RDS(ON)H RDS(ON)L ILIM ILXLEAK
Description
Input Voltage Range Input Under-Voltage Lockout Supply Current Shutdown Current Output Voltage Range Output Voltage Accuracy Line Regulation Load Regulation Feedback Reference Voltage (adjustable version) Leakage Current Oscillator Frequency Foldback Frequency Maximum Duty Cycle Minimum Turn-On Time Soft-Start Time P-Channel Resistance N-Channel Resistance Efficiency PMOS Current Limit Leakage Current
Conditions
Rising Hysteresis Load IOUT 1.5A 4.5V 13.2V 12V, VOUT IOUT 1.5A Load, 25°C VOUT 1.2V Adjustable Version Fixed Version
13.2
Units
-2.5 0.023 0.59 0.60
0.94 0.100
0.61
0.12 0.15 0.06 0.08
12V, VOUT IOUT 1.5A
13.2V,
AAT1162 guaranteed meet performance specifications over -40°C +85°C operating temperature range assured design, characterization, correlation with statistical process controls.
1162.2007.09.1.2
AAT1162
12V, 1.5A Step-Down DC/DC Converter Electrical Characteristics1
4.0V 13.2V. COUT 22µF; 4.7µH, -40°C +85°C, unless otherwise noted. Typical values 25°C. Symbol
THYS
Description
Over-Temperature Shutdown Threshold Over-Temperature Shutdown Hysteresis Logic Input Threshold Logic High Input Threshold Input Current
Conditions
Units
13.2V -1.0
AAT1162 guaranteed meet performance specifications over -40°C +85°C operating temperature range assured design, characterization, correlation with statistical process controls. 1162.2007.09.1.2
AAT1162
12V, 1.5A Step-Down DC/DC Converter Typical Characteristics
Test circuit Figure unless otherwise specified. Efficiency Output Current
(VOUT
Efficiency Output Current
(VOUT 3.3V)
Efficiency
0.001 0.01
Efficiency
8.4V
8.4V
0.001
0.01
Output Current
Output Current
Switching Frequency Temperature
Switching Frequency (kHz)
Non-Switching Quiescent Current Temperature
Current (µA)
Temperature (°C)
Temperature (°C)
Non-Switching Quiescent Current Input Voltage
Switching Quiescent Current Input Voltage
(VOUT
Current (µA)
85°C
25°C
Quiescent Current (µA)
85°C 25°C
-40°C
-40°C
Input Voltage
Input Voltage
1162.2007.09.1.2
AAT1162
12V, 1.5A Step-Down DC/DC Converter Typical Characteristics
Test circuit Figure unless otherwise specified. Switching Quiescent Current Input Voltage
(VOUT 3.3V)
1000
Time Temperature
(VOUT 3.3V)
Quiescent Current (µA)
Time (ns)
85°C
25°C
-40°C
Input Voltage
Temperature (°C)
Output Voltage Tolerance Temperature
(VOUT 3.3V; ILOAD 1.5A) Output Voltage Difference
-0.2 -0.4 -0.6 -0.8
Line Regulation
(VOUT Output Voltage Difference
-0.1 -0.2 -0.3
IOUT 500mA
IOUT 1.5A
IOUT IOUT 100mA
IOUT 10mA
Temperature (°C)
Input Voltage
Line Regulation
(VOUT 3.3V) Output Voltage Difference
-0.1 -0.2 -0.3
Load Regulation
(VOUT Output Voltage Difference
-0.1 -0.2 -0.3 0.0001 0.001 0.01
10mA IOUT 1.5A
=100mA
8.4V
Input Voltage
Output Current (mA)
1162.2007.09.1.2
AAT1162
12V, 1.5A Step-Down DC/DC Converter Typical Characteristics
Test circuit Figure unless otherwise specified. Load Regulation
(VOUT 3.3V) Output Voltage Difference
-0.1 -0.2 -0.3 0.0001 0.001 0.01
N-Channel RDS(ON) Temperature
Resistance
8.4V
Output Current (mA)
Temperature (°C)
P-Channel RDS(ON) Temperature
Line Transient
(VOUT 3.3V; 100pF)
3.48 3.45 3.42 3.39 3.36 3.33 3.27 3.24
Output Voltage (bottom)
Resistance
Input Voltage (top)
Temperature (°C)
Time (20µs/div)
Load Transient
(VOUT 100pF)
10mA
Load Transient
(VOUT 3.3V; 100pF)
1.2A 10mA -0.5
Load Inductor Current (bottom)
Load Inductor Current (bottom)
Output Voltage (top)
Output Voltage (top)
Time (50µs/div)
Time (50µs/div)
1162.2007.09.1.2
AAT1162
12V, 1.5A Step-Down DC/DC Converter Typical Characteristics
Test circuit Figure unless otherwise specified. Load Transient
(VOUT CFF)
10mA
Load Transient
(VOUT 3.3V; CFF)
1.2A 10mA
Load Inductor Current (bottom)
Load Inductor Current (bottom)
Output Voltage (top)
Output Voltage (top)
Time (50µs/div)
Time (50µs/div)
1162.2007.09.1.2
AAT1162
12V, 1.5A Step-Down DC/DC Converter Functional Block Diagram
Note Internal Power Current Sense Error Current Mode Comparator Control Logic
Reference
PGND AGND
DGND
COMP Note fixed output voltage versions, connected error amplifier through resistive voltage divider shown.
Functional Description
AAT1162 current-mode step-down DC/DC converter that operates over wide 13.2V input voltage range capable supplying 1.5A load with output voltage regulated 0.6V. Both P-channel power switch N-channel synchronous rectifier internal, reducing number external components required. output voltage adjusted external resistor divider; fixed output voltage versions available upon request. regulation system externally compensated, allowing circuit optimized each application. AAT1162 includes cycle-by-cycle current limiting, frequency foldback improved short-circuit performance, thermal overload protection prevent damage event external fault condition.
Control Loop
AAT1162 regulates output voltage using constant frequency current mode control. AAT1162 monitors current through high-side Pchannel MOSFET uses that signal regulate output voltage. This provides improved transient response eases compensation. Internal slope compensation included ensure current "inside loop" stability. High efficiency maintained under light load conditions automatically switching variable frequency Light Load control. this condition, transition losses reduced operating lower frequency light loads.
1162.2007.09.1.2
AAT1162
12V, 1.5A Step-Down DC/DC Converter
Short-Circuit Protection
AAT1162 uses cycle-by-cycle current limit protect itself load from external fault condition. When inductor current reaches internally 3.0A current limit, P-channel MOSFET switch turns N-channel synchronous rectifier turned limiting inductor load current. During overload condition, when output voltage drops below regulation voltage (0.3V FB), AAT1162 switching frequency drops factor This gives inductor current ample time reset during time prevent inductor current from rising uncontrolled short-circuit condition.
Applications Information
Setting Output Voltage
Figure shows basic application circuit AAT1162 output setting resistors. Resistors program output regulate voltage higher than 0.6V. limit bias current required external feedback resistor string while maintaining good noise immunity, minimum suggested value 5.9k. Although larger value will further reduce quiescent current, will also increase impedance feedback node, making more sensitive external noise interference. Table summarizes resistor values various output voltages with either 5.9k good noise immunity reduced load input current.
Thermal Protection
AAT1162 includes thermal protection that disables regulator when temperature reaches automatically restarts when temperature decreases more.
4.5V -13.2V 0.1µF DGND DGND PGND
3.8µH 100pF
VOUT 43.2k 22µF 5.9k
22µF
AAT1162
COMP AGND DGND DGND
270pF
Figure Typical Application Circuit. adjustable feedback resistors, combined with external feed forward capacitor Figure deliver enhanced transient response extreme pulsed load applications. addition feed forward capacitor typically requires larger output capacitor stability. Larger values reduce overshoot undershoot during startup load changes. However, exceed 470pF maintain stable operation.
1162.2007.09.1.2
AAT1162
12V, 1.5A Step-Down DC/DC Converter
external resistors output voltage according following equation:
VOUT 0.6V
Inductor Selection
most designs, AAT1162 operates with inductors 4.7µH. output voltages above 3.3V, minimum recommended inductor 3.8µH. 3.3V below, 2.2µH inductor. optimum voltage-positioning load transients, choose inductor with series resistance range. higher efficiency heavy loads (above 1A), minimal load regulation (but some transient overshoot), resistance should kept below 18m. current rating inductor should least equal maximum load current plus half ripple current prevent core saturation (1.5A 263mA). Table lists some typical surface mount inductors that meet target applications AAT1162. Manufacturer's specifications list both inductor current rating, which thermal limitation, peak current rating, which determined saturation characteristics. inductor should show appreciable saturation under normal load conditions. Some inductors meet peak average current ratings result excessive losses high DCR. Always consider losses associated with effect total converter efficiency when selecting inductor. example, 3.7µH CDR7D43 series inductor selected from Sumida 18.9m 4.3ADC current rating. full load, inductor loss 28mW which gives only 0.4% loss efficiency 1.5A, output.
VOUT
Table shows resistor selection different output voltage settings. 5.9(k)
1.96 2.94 3.92 4.99 5.90 6.81 7.87 8.87 11.8 12.4 13.7 18.7 26.7 43.2
VOUT
1.85
59(k)
19.6 29.4 39.2 49.9 59.0 68.1 78.7 88.7
Compensation
AAT1162 step-down converter uses peak current mode control with slope compensation scheme maintain stability with lower value inductors duty cycles greater than 50%. regulation feedback loop stabilized components connected COMP pin, shown Figure
Table Resistor Selection Different Output Voltage Settings. Standard Resistors Substituted Calculated Values.
1162.2007.09.1.2
AAT1162
12V, 1.5A Step-Down DC/DC Converter
Manufacturer
Sumida Sumida Coilcraft
Part Number
CDRH103RNP-2R2N CDR7D43MNNP-3R7NC MSS1038-382NL
(µH)
16.9 18.9
Rated Current
5.10 4.25
Size WxLxH (mm)
10.3x10.5x3.1 7.6x7.6x4.5 10.2x7.7x3.8
Table Typical Surface Mount Inductors.
Layout Guidance
Figure schematic evaluation board. When laying board, following layout guideline should followed ensure proper operation AAT1162: Exposed must reliably soldered PGND/DGND/AGND. exposed thermal should connected board ground plane pins ground plane should include large exposed copper under package thermal dissipation. power traces, including traces, traces trace should kept short, direct wide allow large current flow. connection pins should short possible. several pads when routing between layers. Exposed must reliably soldered pins exposed thermal should connected board connection inductor also pins plane should include large exposed copper under package thermal dissipation.
input capacitors should connected close possible (Pins DGND (Pin good power filtering. Keep switching node away from sensitive node. feedback trace should separate from power trace connected closely possible load point. Sensing along high-current load trace will degrade load regulation. feedback resistors should placed close possible (Pin minimize length high impedance feedback trace. output capacitors should connected close possible there should signal lines under inductor. resistance trace from load return PGND (Pin should kept minimum. This will help minimize error regulation differences potential internal signal ground power ground.
1162.2007.09.1.2
AAT1162
12V, 1.5A Step-Down DC/DC Converter
Enable
1.5A 0.1µF
4.7k
AAT1162 COMP AGND DGND
3.8µH 100pF
VOUT
43.2k 22µF 22µF 22µF
10µF 22µF
DGND DGND
270pF
5.9k
0.1µF
PGND DGND
DGND
Note: Connect GND, DGND, AGND FB1: Chip Ferrite Bead C10: Increase reduce overshoot
Figure AAT1162 Evaluation Board Schematic.
Figure AAT1162 Evaluation Board Component Side Layout.
Figure AAT1162 Evaluation Board Solder Side Layout.
1162.2007.09.1.2
AAT1162
12V, 1.5A Step-Down DC/DC Converter Ordering Information
Package
TDFN34-16
Marking1
YYXYY
Part Number (Tape Reel)2
AAT1162IRN-0.6-T1
AnalogicTech products offered Pb-free packaging. term "Pb-free" means semiconductor products that compliance with current RoHS standards, including requirement that lead exceed 0.1% weight homogeneous materials. more information, please visit website
Package Information
TDFN34-16
3.000 0.050 0.700 0.050 1.600 0.050
Index Area
4.000 0.050
2.350 0.050
0.230 0.050
0.25 1.600 0.050
0.430 0.050
View
Bottom View
0.750 0.050
0.050 0.050
0.230 0.050
Side View
dimensions millimeters.
assembly date code. Sample stock generally held part numbers listed BOLD. 1162.2007.09.1.2
0.450 0.050
0.35
AAT1162
12V, 1.5A Step-Down DC/DC Converter
Advanced Analogic Technologies, Inc. AnalogicTech cannot assume responsibility circuitry other than circuitry entirely embodied AnalogicTech product. circuit patent licenses, copyrights, mask work rights, other intellectual property rights implied. AnalogicTech reserves right make changes their products specifications discontinue product service without notice. Except provided AnalogicTech's terms conditions sale, AnalogicTech assumes liability whatsoever, AnalogicTech disclaims express implied warranty relating sale and/or AnalogicTech products including liability warranties relating fitness particular purpose, merchantability, infringement patent, copyright other intellectual property right. order minimize risks associated with customer's applications, adequate design operating safeguards must provided customer minimize inherent procedural hazards. Testing other quality control techniques utilized extent AnalogicTech deems necessary support this warranty. Specific testing parameters each device necessarily performed. AnalogicTech AnalogicTech logo trademarks Advanced Analogic Technologies Incorporated. other brand product names appearing this document registered trademarks trademarks their respective holders.
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1162.2007.09.1.2

12V, 1.5A Step-Down DC/DC Converter General Description AAT1162 8

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