FEATURES CONTENTS
DESCRIPTION
APPLICATIONS
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TPS40192,TPS40193
SLUS719–MARCH2007 4.5V TO18V INPUT10PIN SYNCHRONOUS BUCK CONTROLLER WITH POWER GOOD
•Input Operating Voltage Range:4.5V to18V
Device Ratings2•Up to20A Output Currents
Electrical Characteristics4•Supports Pre-Biased Outputs
Typical Characteristics6•0.5%0.591V Reference
•600kHz(TPS40192)and300kHz(TPS40193)Terminal Information9
Switching Frequencies
Application Information11•Three Selectable Thermally Compensated
Design Example17 Short Circuit Protection Levels
Additional References27•Hiccup Restart from Faults
•Internal5-V Regulator
•High and Low side FET RDS ON Current
Sensing TPS40192and TPS40193are cost-optimized
synchronous buck controllers that operate from4.5V •10-Pin3mm×3mm SON Package
to18V input.These controllers implement a •Internal4-ms Soft-Start Time voltage-mode control architecture with the switching
•Thermal Shutdown Protection at145°C frequency fixed at either600kHz(TPS40192)or300
kHz(TPS40193).The higher switching frequency
facilitates the use of smaller inductor and output
capacitors,thereby providing a compact •Cable Modem CPE
power-supply solution.An adaptive anti-cross •Digital Set Top Box
conduction scheme is used to prevent shoot through •Graphics/Audio Cards current in the power FETs.
•Entry Level and Mid-Range Servers
SIMPLIFIED APPLICATION DIAGRAM
Please be aware that an important notice concerning availability,standard warranty,and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.Copyright©2007,Texas Instruments Incorporated Products conform to specifications per the terms of the Texas
Instruments standard warranty.Production processing does not
necessarily include testing of all parameters.
DESCRIPTION (continued)
DEVICE RATINGS
ABSOLUTE MAXIMUM RATINGS
RECOMMENDED OPERATING CONDITIONS
PACKAGE DISSIPATION RATINGS
TPS40192,TPS40193
SLUS719–MARCH 2007
Short circuit detection is done by sensing the voltage drop across the low-side MOSFET when it is on and comparing it with a user selected threshold of 100mV,200mV or 280mV.The threshold is set with a single external resistor connected from COMP to GND.This resistor is sensed at startup and the selected threshold is latched.Pulse by pulse limiting (to prevent current runaway)is provided by sensing the voltage across the high-side MOSFET when it is on and terminating the cycle when the voltage drop rises above a fixed threshold of 550mV.When the controller senses an output short circuit,both MOSFETs are turned off and a timeout period is observed before attempting to restart.This provides limited power dissipation in the event of a sustained fault.
ORDERING INFORMATION
TAPE AND REEL T J
PACKAGE
FREQUENCY (kHz)
PART NUMBER QUANTITY
250TPS40193DRCT 300
3000TPS40193DRCR -40°C to 85°C
Plastic 10-Pin SON (DRC)
250TPS40192DRCT 600
3000
TPS40192DRCR
over operating free-air temperature range unless otherwise noted (1)
TPS40192/TPS40193
UNIT
VDD,ENABLE –0.3to 20SW
–5to 25Input voltage range
BOOT,HDRV
–0.3to 30V BOOT-SW,HDRV-SW (differential from BOOT or HDRV to SW)-0.3to 6COMP,FB,BP5,LDRV,PGD
–0.3to 6T J Operating junction temperature range –40to 150°C T stg Storage temperature
–55to 150
(1)
Stresses beyond those listed under "absolute maximum ratings"may cause permanent damage to the device.These are stress ratings only,and functional operation of the device at these or any other
conditions beyond those indicated under "recommended operating conditions"is not implied.Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
MIN
NOM
MAX UNIT V VDD Input voltage
4.518V T J
Operating Junction temperature
-40
125
°C
R θJA High-K Board (1)
Power Rating (W)
Power Rating (W)
PACKAGE
AIRFLOW (LFM)(°C/W)
T A =25°C
T A =85°C
0(Natural Convection)
47.9 2.080.835DRC
20040.5 2.460.987400
38.2
2.61
1.04
(1)
Ratings based on JEDEC High Thermal Conductivity (High K)Board.For more information on the test method,see TI Technical Brief SZZA017.
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ELECTROSTATIC DISCHARGE(ESD)PROTECTION
TPS40192,TPS40193
SLUS719–MARCH2007 MIN TYP MAX UNIT
Human Body Model(HBM)2500
V Charged Device Model(CDM)1500
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ELECTRICAL CHARACTERISTICS
TPS40192,TPS40193
SLUS719–MARCH 2007
T J =–40°C to 85°C,V VDD =12V dc ,all parameters at zero power dissipation (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
REFERENCE 0°C ≤T J ≤85°C 588591594V FB
Feedback voltage range
mV
-40°C ≤T J ≤85°C
585591
594INPUT SUPPLY V VDD Input voltage range 4.5
18.0V V ENABLE =3V 2.5 4.0mA I VDD
Operating current
V ENABLE =0.6V
4570μA ON BOARD REGULATOR V 5VBP Output voltage
V VDD >6V,I 5VBP ≤10mA
5.1
5.3 5.5V V DO Regulator dropout voltage V VDD -V BP5,V VDD =5V,I BP5≤25mA
350550
mV I SC Regulator current limit threshold 50
mA
I BP5
Average current
50
OSCILLATOR TPS40193240300360f SW Switching frequency kHz TPS40192
500
600700
V RMP Ramp amplitude (1)
1
V
PWM D MAX Maximum duty cycle (1)85%
t ON(min)Minimum controlled pulse (1)110
HDRV off to LDRV on 50ns
t DEAD
Output driver dead time LDRV off to HDRV on
25SOFT-START t SS Soft-start time 3
46
t SSDLY Soft-start delay time 2ms t REG Time to regulation 6
ERROR AMPLIFIER
GBWP Gain bandwidth product (1)710
MHz A OL DC gain
(1)
60
dB Input bias current (current out of FB I IB 100
nA pin)
I EAOP Output source current V FB =0V 1mA I EAOM Output sink current
V FB =2V
1
SHORT CIRCUIT PROTECTION
t PSS(min)Minimum pulse during short circuit (1)250
ns t BLNK Blanking time
(1)
6090120
t OFF Off-time between restart attempts 30
50ms
R COMP(GND)=OPEN,T J =25°C 160200240Short circuit comparator threshold V ILIM
R COMP(GND)=4k Ω,T J =25°C 80100120voltage
mV
R COMP(GND)=12k Ω,T J =25°C
228280342Short circuit threshold voltage on V ILIMH T J =25°C
400
550
650
high-side MOSFET
(1)
Ensured by design.Not production tested.
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TPS40192,TPS40193
SLUS719–MARCH2007
ELECTRICAL CHARACTERISTICS(continued)
T J=–40°C to85°C,V VDD=12V dc,all parameters at zero power dissipation(unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
OUTPUT DRIVERS
R HDHI High-side driver pull-up resistance V BOOT-V SW=4.5V,I HDRV=-100mA36
R HDLO High-side driver pull-down resistance V BOOT-V SW=4.5V,I HDRV=100mA 1.5 3.0
Ω
R LDHI Low-side driver pull-up resistance I LDRV=-100mA 2.5 5.0
R LDLO Low-side driver pull-down resistance I LDRV=100mA0.8 1.5
t HRISE High-side driver rise time(2)1535
t HFALL High-side driver fall time(2)1025
C LOAD=1nF ns
t LRISE Low-side driver rise time(2)1535
t LFALL Low-side driver fall time(2)1025
UVLO
V UVLO Turn-on voltage 3.9 4.2 4.4V
UVLO HYST Hysteresis700800900mV
SHUTDOWN
V IH High-level input voltage,ENABLE 1.9 3.0
V
V IL Low-level input votlage,ENABLE0.6
POWER GOOD
V OV Feedback voltage limit for powergood650
V UV Feedback voltage limit for powergood525
mV Powergood hysteresis voltage at FB
V PG_HYST30 pin
R PGD Pulldown resistance of PGD pin V FB=0V750Ω
I PDGLK Leakage current V FB=0V712μA
BOOT DIODE
V DFWD Bootstrap diode forward voltage I BOOT=5mA0.50.8 1.2V
THERMAL SHUTDOWN
T JSD Junction shutdown temperature(2)145
°C
T JSDH Hysteresis(2)20
(2)Ensured by design.Not production tested.
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