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Buck Controller. TPS40005 Datasheet |
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TPS40000, TPS40001
TPS40002, TPS40003
TPS40004, TPS40005
SLUS507D − JANUARY 2002 − REVISED NOVEMBER 2005
LOWĆINPUT VOLTAGEĆMODE
SYNCHRONOUS BUCK CONTROLLER
FEATURES
D Operating Input Voltage 2.25 V to 5.5 V
D Output Voltage as Low as 0.7 V
D 1% Internal 0.7 V Reference
D Predictive Gate Drivet N-Channel MOSFET
Drivers for Higher Efficiency
D Externally Adjustable Soft-Start and
Overcurrent Limit
D Source-Only Current or Source/Sink Current
D Versions for Starting Into VOUT Pre-Bias
D 10-Lead MSOP PowerPadt Package for
Higher Performance
D Thermal Shutdown
D Internal Boostrap Diode
D Fixed-Frequency, Voltage-Mode Control
− TPS40000/1/4 300-kHz
− TPS40002/3/5 600-kHz
SIMPLIFIED APPLICATION DIAGRAM
APPLICATIONS
D Networking Equipment
D Telecom Equipment
D Base Stations
D Servers
D DSP Power
D Power Modules
DESCRIPTION
The TPS4000x are controllers for low-voltage,
non-isolated synchronous buck regulators. These
controllers drive an N-channel MOSFET for the
primary buck switch, and an N-channel MOSFET
for the synchronous rectifier switch, thereby
achieving very high-efficiency power conversion. In
addition, the device controls the delays from main
switch off to rectifier turn-on and from rectifier
turn-off to main switch turn-on in such a way as to
minimize diode losses (both conduction and
recovery) in the synchronous rectifier with TI’s
proprietary Predictive Gate Drivet technology. The
reduction in these losses is significant and increases
efficiency. For a given converter power level, smaller
FETs can be used, or heat sinking can be reduced
or even eliminated.
VIN
TPS40000
1 ILIM
BOOT 10
2 FB
HDRV 9
3 COMP
4 SS/SD
SW 8
VDD 7
VOUT
5 GND
LDRV 6
PowerPADt and Predictive Gate Drivet are trademarks of Texas Instruments Incorporated.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
www.ti.com
UDG−01141
Copyright 2005, Texas Instruments Incorporated
1
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TPS40000, TPS40001
TPS40002, TPS40003
TPS40004, TPS40005
SLUS507D − JANUARY 2002 − REVISED NOVEMBER 2005
DESCRIPTION (continued)
The current-limit threshold is adjustable with a single resistor connected to the device. The TPS4000x
controllers implement a closed-loop soft start function. Startup ramp time is set by a single external capacitor
connected to the SS/SD pin. The SS/SD pin is also used for shutdown.
ORDERING INFORMATION
PACKAGED DEVICES MSOP(2) (DGQ)
APPLICATION
TA
FREQUENCY
SOURCE
ONLY
SOURCE/SINK SOURCE/SINK(3)
WITH PREBIAS(3)
−40°C to 85°C
300 kHz
600 kHz
TPS40000DGQ
TPS40002DGQ
TPS40001DGQ
TPS40003DGQ
TPS40004DGQ
TPS40005DGQ
(2) The DGQ package is available taped and reeled. Add R suffix to device type (e.g.
TPS40000DGQR) to order quantities of 2,500 devices per reel and 80 units per tube.
(3) See Application Information section, p. 8.
ABSOLUTE MAXIMUM RATINGS
over operating free-air temperature range unless otherwise noted(1)
TPS4000x
UNIT
BOOT
COMP, FB, ILIM, SS/SD
VSW + 6.5
−0.3 to 6
Input voltage range, VIN
SW
SWT (SW transient < 50 ns)
VDD
−0.7 to 10.5
−2.5
6
V
Operating junction temperature range, TJ
−40 to 150
Storage temperature, Tstg
−55 to 150
°C
Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds
260
(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.
ILIM
FB
COMP
SS/SD
GND
DGQ PACKAGE(4).(5)
(TOP VIEW)
1 10
29
38
47
56
BOOT
HDRV
SW
VDD
LDRV
ACTUAL SIZE
3,05mm x 4,98mm
(4) See technical brief SLMA002 for PCB guidelines for PowerPAD packages.
(5) PowerPADt heat slug can be connected to GND (pin 5).
2 www.ti.com
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TPS40000, TPS40001
TPS40002, TPS40003
TPS40004, TPS40005
SLUS507D − JANUARY 2002 − REVISED NOVEMBER 2005
ELECTRICAL CHARACTERISTICS
over recommended operating temperature range, TA = −40_C to 85_C, VDD = 5.0 V, all parameters measured at zero
power dissipation (unless otherwise noted)
input supply
PARAMETER
VDD
VHGATE
Input voltage range
High-side gate voltage
Shutdown current
IDD Quiescent current
Switching current
UVLO Minimum on-voltage
Hysteresis
TEST CONDITIONS
VBOOT − VSW
SS/SD = 0 V,
Outputs off
FB = 0.8 V
No load at HDRV/LDRV
oscillator
PARAMETER
fOSC Oscillator frequency
TPS40000
TPS40001
TPS40004
TPS40002
TPS40003
TPS40005
TEST CONDITIONS
2.25 V ≤ VDD ≤ 5.00 V
VRAMP Ramp voltage
Ramp valley voltage
VPEAK − VVALLEY
PWM
PARAMETER
Maximum duty cycle(2)
TPS40000
TPS40001
TPS40004
TPS40002
TPS40003
TPS40005
FB = 0 V,
TEST CONDITIONS
VDD = 3.3 V
Minimum duty cycle
error amplifier
PARAMETER
TEST CONDITIONS
VFB FB input voltage
FB input bias current
Line,
TA = 25°C
Temperature
VOH High-level output voltage
FB = 0 V,
IOH = 0.5 mA
VOL
Low-level output voltage
FB =VDD,
IOL = 0.5 mA
IOH Output source current
COMP = 0.7 V, FB = GND
IOL
GBW
Output sink current
Gain bandwidth(1)
COMP = 0.7 V, FB = VDD
AOL
Open loop gain
(1) Ensured by design. Not production tested.
(2) At VDD input voltage of 2.25 V, derate the maximum duty cycle by 3%.
MIN
2.25
1.95
80
TYP
0.25
1.4
1.5
2.05
140
MAX
5.5
5.5
0.45
2.0
4.0
2.15
200
UNIT
V
mA
V
mV
MIN TYP MAX UNIT
250 300 350
kHz
500 600 700
0.80 0.93 1.07
V
0.24 0.31 0.41
MIN TYP MAX UNIT
87% 94% 97%
83%
93%
97%
0%
MIN
0.689
0.693
2.0
2
3
5
55
TYP
0.700
0.700
30
2.5
0.08
6
8
10
85
MAX
0.711
0.707
130
UNIT
V
nA
V
0.15
mA
MHz
dB
www.ti.com
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