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参数资料
| 型号： | TPS54331DDAR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 2 A SWITCHING REGULATOR, 684 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封装： | PLASTIC, MS-012BA, SOP-8 |
| 文件页数： | 21/27页 |
| 文件大小： | 794K |
| 代理商： | TPS54331DDAR |
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www.ti.com
SLVS839C – JULY 2008 – REVISED MARCH 2010
PACKAGE DISSIPATION RATINGS
(1) (2) (3)
THERMAL IMPEDANCE
PSEUDO THERMAL IMPEDANCE
PACKAGE
JUNCTION TO AMBIENT
JUNCTION TO TOP
SOIC8
100°C/W
5°C/W
(1)
Maximum power dissipation may be limited by overcurrent protection
(2)
Power rating at a specific ambient temperature TA should be determined with a junction temperature of 150°C. This is the point where
distortion starts to substantially increase. Thermal management of the PCB should strive to keep the junction temperature at or below
150°C for best performance and long-term reliability. See power dissipation estimate in application section of this data sheet for more
information.
(3)
Test board conditions:
(a) 2 inches x 1.5 inches, 2 layers, thickness: 0.062 inch
(b) 2-ounce copper traces located on the top and bottom of the PCB
(c) 6 thermal vias located under the device package
RECOMMENDED OPERATING CONDITIONS
over operating free-air temperature range (unless otherwise noted)
MIN
TYP
MAX
UNIT
Operating Input Voltage on (VIN pin)
3.5
28
V
Operating junction temperature, TJ
–40
150
°C
ELECTRICAL CHARACTERISTICS
TJ = –40°C to 150°C, VIN = 3.5V to 28V (unless otherwise noted)
DESCRIPTION
TEST CONDITIONS
MIN
TYP
MAX
UNIT
SUPPLY VOLTAGE (VIN PIN)
Internal undervoltage lockout threshold
Rising and Falling
3.5
V
Shutdown supply current
EN = 0V, VIN = 12V, –40°C to 85°C
1
4
mA
Operating – non switching supply current
VSENSE = 0.85 V
110
190
mA
ENABLE AND UVLO (EN PIN)
Enable threshold
Rising and Falling
1.25
1.35
V
Input current
Enable threshold – 50 mV
-1
mA
Input current
Enable threshold + 50 mV
-4
mA
VOLTAGE REFERENCE
Voltage reference
0.772
0.8
0.828
V
HIGH-SIDE MOSFET
BOOT-PH = 3 V, VIN = 3.5 V
115
200
m
On resistance
BOOT-PH = 6 V, VIN = 12 V
80
150
ERROR AMPLIFIER
Error amplifier transconductance (gm)
–2 mA < ICOMP < 2 mA, V(COMP) = 1 V
92
mmhos
Error amplifier DC gain(1)
VSENSE = 0.8 V
800
V/V
Error amplifier unity gain bandwidth(1)
5 pF capacitance from COMP to GND pins
2.7
MHz
Error amplifier source/sink current
V(COMP) = 1 V, 100 mV overdrive
±7
mA
Switch current to COMP transconductance
VIN = 12 V
12
A/V
SWITCHING FREQUENCY
Switching Frequency
VIN = 12V, 25°C
456
570
684
kHz
Minimum controllable on time
VIN = 12V, 25°C
105
130
ns
Maximum controllable duty ratio(1)
BOOT-PH = 6 V
90%
93%
PULSE SKIPPING ECO-MODE
Pulse skipping Eco-mode switch current threshold
160
mA
CURRENT LIMIT
Current limit threshold
VIN = 12 V
3.5
5.8
A
(1)
Specified by design
Copyright 2008–2010, Texas Instruments Incorporated
3
Product Folder Link(s): TPS54331
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