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Giải thích chi tiết về linh kiện  7A SIMPLE SWITCHER짰 Power Module with 2.95V-17V Input and Current Sharing in QFN Package
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LMZ31707
www.ti.com
SLVSBV7A – JUNE 2013 – REVISED AUGUST 2013
ELECTRICAL CHARACTERISTICS
Over –40°C to 85°C free-air temperature, PVIN = VIN = 12 V, VOUT = 1.8 V, IOUT = 7 A,
CIN = 0.1 µF + 2 x 22 µF ceramic + 100 µF bulk, COUT = 4 x 47 µF ceramic (unless otherwise noted)
(1)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
IOUT
Output current
TA = 85°C, natural convection
0
7
A
VIN
Input bias voltage range
Over output current range
4.5
17
V
PVIN
Input switching voltage range
Over output current range
2.95(2)
17(3)
V
VIN Increasing
4.0
4.5
UVLO
VIN Undervoltage lockout
V
VIN Decreasing
3.5
3.85
VOUT(adj)
Output voltage adjust range
Over output current range
0.6
5.5
V
Set-point voltage tolerance
TA = 25°C, IOUT = 0 A
±1%(4)
Temperature variation
–40°C
≤ TA ≤ +85°C, IOUT = 0 A
±0.2%
VOUT
Line regulation
Over input voltage range
±0.1%
Load regulation
Over output current range
±0.2%
Total output voltage variation
Includes set-point, line, load, and temperature variation
±1.5%(4)
VOUT = 5.0 V, fSW = 1 MHz
94 %
VOUT = 3.3 V, fSW = 750 kHz
92 %
VOUT = 2.5 V, fSW = 750 kHz
90 %
PVIN = VIN = 12 V
VOUT = 1.8 V, fSW = 500 kHz
89 %
IO = 4 A
VOUT = 1.2 V, fSW = 300 kHz
87 %
VOUT = 0.9 V, fSW = 250 kHz
85 %
η
Efficiency
VOUT = 0.6 V, fSW = 200 kHz
82 %
PVIN = VIN = 5 V
VOUT = 3.3 V, fSW = 750 kHz
95 %
IO = 4 A
VOUT = 2.5 V, fSW = 750 kHz
93 %
VOUT = 1.8 V, fSW = 500 kHz
92 %
VOUT = 1.2 V, fSW = 300 kHz
90 %
VOUT = 0.9 V, fSW = 250 kHz
87 %
VOUT = 0.6 V, fSW = 200 kHz
84 %
Output voltage ripple
20 MHz bandwith
14
mVP-P
ILIM pin open
12
A
ILIM
Current limit threshold
ILIM pin to AGND
9
A
Recovery time
tbd
µs
1.0 A/µs load step from
Transient response
25 to 75% IOUT(max)
VOUT over/undershoot
tbd
mV
Inhibit High Voltage
1.3
open(5)
VINH
Inhibit threshold voltage
V
Inhibit Low Voltage
-0.3
1.1
INH Input current
VINH < 1.1 V
-1.15
μA
IINH
INH Hysteresis current
VINH > 1.3 V
-3.3
μA
II(stby)
Input standby current
INH pin to AGND
2
10
µA
Good
95%
VOUT rising
Fault
108%
PWRGD Thresholds
Power Good
Fault
91%
VOUT falling
Good
104%
PWRGD Low Voltage
I(PWRGD) = 0.5 mA
0.3
V
fSW
Switching frequency
RRT = 169 kΩ
400
500
600
kHz
(1)
See the Light Load Efficiency (LLE) section for more information for output voltages < 1.5 V.
(2)
The minimum PVIN is 2.95 V or (VOUT + 0.7 V), whichever is greater. See Table 9 for more details.
(3)
The maximum PVIN voltage is 17 V or (22 x VOUT), whichever is less. See Table 9 for more details.
(4)
The stated limit of the set-point voltage tolerance includes the tolerance of both the internal voltage reference and the internal
adjustment resistor. The overall output voltage tolerance will be affected by the tolerance of the external RSET resistor.
(5)
This pin has an internal pull-up. If it is left open, the device operates when input power is applied. A small, low-leakage MOSFET is
recommended for control. When the device is operating and no UVLO resistor divider is present on this pin, the open voltage is typically
2.9 V.
Copyright © 2013, Texas Instruments Incorporated
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