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TPS40040 Datasheet Preview

TPS40040 Datasheet

SYNCHRONOUS BUCK DC-TO-DC CONTROLLER

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TPS40040, TPS40041
www.ti.com
SLUS700D – MARCH 2006 – REVISED DECEMBER 2007
LOW PIN COUNT, LOW VIN (2.5 V TO 5.5 V) SYNCHRONOUS BUCK DC-TO-DC
CONTROLLER WITH ENABLE
FEATURES
1
23 2.25-V to 5.5-V Input
Output Voltage from 0.6 V to 90% of VIN
High-Side Drive for N-Channel FET
Supports Pre-Biased Outputs
Adaptive Anti-Cross Conduction Gate Drive
1%, 0.6-V Reference
Two Fixed Switching Frequency Versions,
TPS40040 (300 kHz) and TPS40041 (600 kHz)
Three Selectable Short Circuit Protection
Levels of 105 mV, 180 mV and 310 mV
Hiccup Restart from Faults
Voltage Mode Control
Active Low Enable
Thermal Shutdown Protection at 145C
8-Pin, 3-mm x 3-mm SON with Ground
Connection to Thermal Pad
APPLICATIONS
Point of Load
Telecommunications
DC to DC Modules
Set Top Boxes
CONTENTS
Device Ratings
2
Electrical Characteristics
3
Device Information
8
Application Information
10
Design Examples
19
Additional References
32
DESCRIPTION
The TPS40040 and TPS40041 dc-to-dc controllers
are designed to operate from a 2.25-V to 5.5-V input
source. To reduce the number of external
components, several operating parameters are fixed
internally; namely, frequency, soft start time, and
short circuit protection (SCP) levels. For example, the
operating frequencies of TPS40040/1 are 300
kHz/600 kHz, respectively.
SIMPLIFIED APPLICATION DIAGRAM
VIN
TPS40040/1
1 EN
HDRV 8
2 FB
SW 7
3 COMP
BOOT 6
4 VDD GND LDRV 5
VOUT
1
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.
PowerPAD is a trademark of Texas Instruments.
2
Predictive Gate Drive is a registered trademark of Texas Instruments.
3
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2006–2007, Texas Instruments Incorporated




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TPS40040 Datasheet Preview

TPS40040 Datasheet

SYNCHRONOUS BUCK DC-TO-DC CONTROLLER

No Preview Available !

TPS40040, TPS40041
SLUS700D – MARCH 2006 – REVISED DECEMBER 2007
www.ti.com
DESCRIPTION (CONT.)
One of three short circuit threshold levels may be selected by the addition of an external resistor from the COMP
pin to circuit ground. During power on, and before the internal soft start commands the output voltage to rise, the
TPS40040/1 enters a calibration cycle, measures the current out of the COMP pin, and selects an internal SCP
threshold voltage. At the end of the 1.6-ms calibration time, the output voltage is allowed to rise for a 4-ms soft
start. During operation, the selected SCP threshold voltage is compared to the upper MOSFET’s voltage drop
during its ON time to determine whether there is an overload condition.
The packaging of the TPS40040/1 is unique in that the PowerPAD™ is used as an electrical ground connection
as well as a thermal connection.
OPERATING FREQUENCY
300 kHz
300 kHz
600 kHz
600 kHz
ORDERING INFORMATION
PACKAGE
Plastic 8-pin SON (DRB)
Plastic 8-pin SON (DRB)
Plastic 8-pin SON (DRB)
Plastic 8-pin SON (DRB)
TAPE AND REEL QTY.
250
3000
250
3000
PART NUMBER
TPS40040DRBT
TPS40040DRBR
TPS40041DRBT
TPS40041DRBR
DEVICE RATINGS
ABSOLUTE MAXIMUM RATINGS
over operating free-air temperature range (unless otherwise noted, all voltages are with respect to GND.)
VDD
SW
SW
BOOT
HDRV
EN, FB, LDRV
COMP
PARAMETER
transient (< 50 ns)
Operating junction temperature
Storage junction temperature
VALUE
6.5
-3 to 10.5
-5
SW+6.5
SW to SW+6.5
-0.3 to 6.5
-0.3 to 3
-40 to 150
-55 to 150
UNIT
V
C
RECOMMENDED OPERATING CONDITIONS
over operating free-air temperature range (unless otherwise noted)
PARAMETER
VIN
Input voltage
TJ
Junction temperature
MIN
TYP
2.25
-40
MAX
5.5
125
UNIT
V
C
ELECTROSTATIC DISCHARGE (ESD) PROTECTION
Human body model
CDM
PARAMETER
MIN
TYP
MAX
UNIT
2500
V
1500
V
PACKAGE DISSIPATION RATINGS(1)
THERMAL IMPEDANCE
JUNCTION-TO-AMBIENT
48C/W
TA = 25C POWER RATING
2W
TA = 85C POWER RATING
0.8W
(1) For more information on the DRB package and the test method, refer to TI technical brief, literature number SZZA017.
2
Copyright © 2006–2007, Texas Instruments Incorporated
Product Folder Link(s): TPS40040 TPS40041


Part Number TPS40040
Description SYNCHRONOUS BUCK DC-TO-DC CONTROLLER
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TPS40040 Datasheet PDF






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