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LMZ31520RLGT Datasheet(PDF) 4 Page - Texas Instruments

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No. de pieza LMZ31520RLGT
Descripción Electrónicos  20A SIMPLE SWITCHER짰 Power Module with 3.0V-14.5V Input in QFN Package
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Fabricante Electrónico  TI1 [Texas Instruments]
Página de inicio  http://www.ti.com
Logo TI1 - Texas Instruments

LMZ31520RLGT Datasheet(HTML) 4 Page - Texas Instruments

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LMZ31520
SLVSBM9B – OCTOBER 2013 – REVISED DECEMBER 2013
www.ti.com
ELECTRICAL CHARACTERISTICS
TA = -40°C to 85°C, VIN = 12 V, VOUT = 1.8 V, IOUT = 20A
CIN = 2x 22 µF ceramic & 330 µF bulk, COUT = 4x 100 µF ceramic (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
IOUT
Output current
0
20
A
VIN
Input bias voltage range
Over IOUT range
4.5
14.5
V
PVIN
Input switching voltage range
Over IOUT range
3.0(1)
14.5
V
VIN Increasing
4.0
4.2
4.33
V
UVLO
VIN Undervoltage lockout
Hysteresis
0.25
VOUT(adj)
Output voltage adjust range
Over IOUT range
0.6
3.6
V
Set-point voltage tolerance
IOUT = 20 A, FCCM mode
±1.0% (2)
Temperature variation
-40°C
≤ TA ≤ +85°C
±0.25%
VOUT
Load regulation
Over IOUT range
+0.3%
Total output voltage variation
Includes set-point, load, and temperature variation
±1.8% (2)
PVIN ±10%
±0.1%
Line regulation
Over PVIN range
±0.5%
VOUT = 3.3 V, fSW = 500kHz
94
VOUT = 1.8 V, fSW = 500kHz
92
PVIN = VIN = 12 V
VOUT = 1.2 V, fSW = 500kHz
88
%
IO = 15 A
VOUT = 0.9 V, fSW = 500kHz
86
VOUT = 0.6 V, fSW = 500kHz
82
η
Efficiency
PVIN = VIN = 5 V
VOUT = 3.3 V, fSW = 500kHz
96
IO = 15 A
VOUT = 1.8 V, fSW = 500kHz
94
VOUT = 1.2 V, fSW = 500kHz
91
%
VOUT = 0.9 V, fSW = 500kHz
88
VOUT = 0.6 V, fSW = 500kHz
85
Output voltage ripple
20 MHz bandwith
1%
VOUT
ILIM
Current limit threshold
30
A
Recovery time
25
µs
2.5 A/µs load step from 25 to 75%
Transient response
IOUT(max)
VOUT over/undershoot
25
mV
Inhibit High Voltage
1.8
Open(3)
V
VINH
Inhibit Control
Inhibit Low Voltage
-0.3
0.6
V
VIN = 5 V
0.5
0.7
mA
IIN(stby)
VIN standby current
INH pin to AGND
VIN = 12 V
1.2
1.5
mA
Good
95
VOUT rising
Fault
115
PWRGD Thresholds
%
Power Good
Fault
90
VOUT falling
Good
110
PWRGD Low Voltage
I(PWRGD) = 2 mA
0.2
0.3
V
fSW
Switching frequency
FREQ_SEL pin OPEN, IOUT = 10 A
470
520
570
kHz
66 k
Ω resistor between FREQ_SEL pin and PGND
300
kHz
fSEL
Frequency Select(4)
FREQ_SEL pin connected to V5V (pin 61)
850
kHz
Thermal shutdown
145
°C
Thermal Shutdown
Thermal shutdown hysteresis
10
°C
Ceramic
44 (5)
94
CIN
External input capacitance
µF
Non-ceramic
330
(1)
The minimum PVIN voltage is 3.0V or (VOUT+ 1.1V), whichever is greater. See VIN and PVIN Input Voltage for more details.
(2)
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.
(3)
This pin has an internal pull-up to approximately 0.4 x VIN. If this pin is left open circuit, the device operates when a valid input voltage is
applied. A small, low-leakage (<300nA) MOSFET is recommended for control.
(4)
See the Frequency Select section for more information on selecting the frequency.
(5)
A minimum of 44 µF (2x 22 µF) of external ceramic capacitance is required across the input (PVIN/VIN and PGND connected) for
proper operation. Locate the capacitor close to the device. See Table 3 for more details. When operating with split VIN and PVIN rails,
place 4.7 µF of ceramic capacitance directly at the VIN pin to PGND.
4
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Copyright © 2013, Texas Instruments Incorporated
Product Folder Links: LMZ31520


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