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参数资料
| 型号： | TC120333EHATR |
| 元件分类： | 稳压器 |
| 英文描述： | 0.7 A SWITCHING REGULATOR, 345 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封装： | SOP, 8 PIN |
| 文件页数： | 3/10页 |
| 文件大小： | 80K |
| 代理商： | TC120333EHATR |
2
PWM/PFM STEP-DOWN COMBINATION
REGULATOR/CONTROLLER
TC120
TC120-1 7/27/99
ABSOLUTE MAXIMUM RATINGS*
Power Supply Voltage (VIN) ....................... –0.3V to +12V
Voltage on VOUT Pin ................................... –0.3V to +12V
Voltage on LX, Boost Pins ...... (VIN – 12V) to (VIN + 0.3V)
Voltage on EXT1, EXT2, SHDN Pins
................................................ (–0.3V) to (VIN + 0.3V)
LX Pin Current .......................................................700 mA
EXT1, EXT2 Pin Current .......................................
±50 mA
Continuous Power Dissipation ............................. 300 mW
ELECTRICAL CHARACTERISTICS: (Test Circuit of Figure 1, TA = 25°C, VIN =VR x 1.2, Note 1, unless other-
wise noted)
Symbol
Parameter
Test Conditions
Min
Typ
Max
Unit
VOUT
Output Voltage
VR = 3.0, IOUT=120mA (Note 1)
VR x 0.975 VR ± 0.5% VR x 1.025
V
VR = 3.3, IOUT =132mA
VR = 5.0, IOUT =200mA
VIN
Input Voltage
1.8
—
10
V
IOUT(MAX)
Maximum Output Current
VOUT = 3.0V
500
—
mA
VOUT = 3.3V
600
—
VOUT = 5.0V
600
—
IIN
Supply Current
VIN = VR x 1.05,
VOUT = 3.0V
—
52
82
A
No Load
VOUT = 3.3V
—
55
86
VOUT = 5.0V
—
71
110
ISHDN
Shutdown Supply Current
(Note 2),
—
1.5
2.5
A
No Load, SHDN = 0V
ILX
LX Pin Leakage Current
Measured at EXT 1 Pin (Note 2)
—
2
A
No Load, SHDN = 0V
—
1.5
2.5
RDSON(LX)
LX Pin ON Resistance
VOUT = VR x 0.9 (Note 2) VOUT = 3.0V
—
0.69
0.94
VLX = VIN – 0.2V, 10
VOUT = 3.3V
—
0.64
0.85
Resistor from LX to VIN,VOUT = 5.0V
—
0.44
0.58
SHDN = VIN
REXTH
EXT1, EXT2
(Note 2);
VOUT = 3.0V
—
38
52
On Resistance to VIN
SHDN = VIH; EXT1 and
VOUT = 3.3V
—
35
47
EXT 2 connected to
VOUT = 5.0V
—
24
32
200
load, VEXT1 =
VEXT2 = (VIN – 0.4V);
VOUT = VIN
REXTL
EXT1, EXT2
(Note 2);
VOUT = 3.0V
—
31
41
On Resistance to GND
SHDN = VIH; EXT1 and
VOUT = 3.3V
—
29
37
EXT2 pulled up through
VOUT = 5.0V
—
20
26
a series resistance of
200
to a voltage such
that VEXT1, 2 = 0.4V
fOSC
Oscillator Frequency
Measured at EXT1 pin, VIN = VOUT +0.3V,
255
300
345
KHz
IOUT = 20 mA, (Note 3)
DPWM
Maximum PWM Duty Cycle
–
—
100
%
DPFM
PFM Duty Cycle
No Load
15
25
35
%
η
Efficiency
VIN > VR x 1.2
—
95
—
%
VUVLO
Minimum Operating Voltage
VOUT = VR x 0.9 (Note 2), SHDN = VIN
0.9
—
1.8
V
Measured with internal transistor in OFF
state and VIN falling.
VIH
SHDN Input Logic High
(Note 2), VOUT = 0V
0.65
—
V
Threshold Voltage
VIL
SHDN Input Logic Low
(Note 2), VOUT = 0V
—
0.2
V
Threshold Voltage
tPRO
Short Circuit Protection
(Note 2) Time from VOUT = 0V to
3
5
8
msec
Response Time
SHDN = VIL
tSS
Soft Start Time
6
10
16
msec
Notes:
1. VR is the factory-programmed output voltage setting.
3. While operating in PWM Mode.
2. No external components connected, except CSS.
Operating Temperature (TC) ...................... –40°C to 85°C
Storage Temperature (TSTG) .................... –40°C to 150°C
*Static-sensitive device. Unused devices must be stored in conductive
material. Protect devices from static discharge and static fields. Stresses
above those listed under Absolute Maximum Ratings may cause perma-
nent damage to the device. These are stress ratings only and functional
operation of the device at these or any other conditions above those
indicated in the operational sections of the specifications is not implied.
Exposure to Absolute Maximum Rating Conditions for extended periods
may affect device reliability.
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