Datasheet
LMZ31506
SNVS993 –JUNE 2013
www.ti.com
ELECTRICAL CHARACTERISTICS
Over –40°C to 85°C free-air temperature, PVIN = VIN = 12 V, V
OUT
= 1.8 V, I
OUT
= 6 A,
C
IN1
= 2 x 22 µF ceramic, C
IN2
= 68 µF poly-tantalum, C
OUT1
= 4 x 47 µF ceramic (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
I
OUT
Output current T
A
= 85°C, natural convection 0 6 A
VIN Input bias voltage range Over I
OUT
range 4.5 14.5 V
PVIN Input switching voltage range Over I
OUT
range 1.6
(1)
14.5
(2)
V
VIN = increasing 4.0 4.5
UVLO VIN Undervoltage lockout V
VIN = decreasing 3.5 3.85
V
OUT(adj)
Output voltage adjust range Over I
OUT
range 0.6
(2)
5.5 V
Set-point voltage tolerance T
A
= 25°C, I
OUT
= 0A ±1.0%
(3)
Temperature variation -40°C ≤ T
A
≤ +85°C, I
OUT
= 0A ±0.3%
V
OUT
Line regulation Over PVIN range, T
A
= 25°C, I
OUT
= 0A ±0.1%
Load regulation Over I
OUT
range, T
A
= 25°C ±0.1%
Total output voltage variation Includes set-point, line, load, and temperature variation ±1.5%
(3)
V
OUT
= 5 V, f
SW
= 780 kHz 92 %
V
OUT
= 3.3 V, f
SW
= 630 kHz 91 %
V
OUT
= 2.5 V, f
SW
= 530 kHz 89 %
PVIN = VIN = 12 V
I
O
= 2 A
V
OUT
= 1.8 V, f
SW
= 480 kHz 88 %
V
OUT
= 1.2 V, f
SW
= 480 kHz 85 %
V
OUT
= 0.8 V, f
SW
= 480 kHz 80 %
η Efficiency
PVIN = VIN = 5 V V
OUT
= 3.3V, f
SW
= 630 kHz 95 %
I
O
= 2 A
V
OUT
= 2.5V, f
SW
= 530 kHz 93 %
V
OUT
= 1.8V, f
SW
= 480 kHz 91 %
V
OUT
= 1.2V, f
SW
= 480 kHz 89 %
V
OUT
= 0.8V, f
SW
= 480 kHz 85 %
V
OUT
= 0.6V, f
SW
= 250 kHz 83 %
Output voltage ripple 20 MHz bandwith 30 mV
PP
I
LIM
Overcurrent threshold 11 A
Recovery time 80 µs
1.0 A/µs load step
Transient response
from 50 to 100% I
OUT(max)
V
OUT
over/undershoot 60 mV
V
INH-H
Inhibit High Voltage 1.30 Open
(4)
Inhibit Control V
V
INH-L
Inhibit Low Voltage –0.3 1.05
INH Input current INH < 1.1 V -1.15 μA
INH Hysteresis current INH > 1.26 V -3.4 μA
I
I(stby)
Input standby current INH pin to AGND 2 4 µA
Good 94%
V
OUT
rising
Fault 109%
PWRGD Thresholds
Power
Fault 91%
Good
V
OUT
falling
Good 106%
PWRGD Low Voltage I(PWRGD) = 2 mA 0.3 V
f
SW
Switching frequency Over VIN and I
OUT
ranges, RT/CLK pin OPEN 200 250 300 kHz
f
CLK
Synchronization frequency 250 780 kHz
V
CLK-H
CLK High-Level 2.0 5.5 V
CLK Control
V
CLK-L
CLK Low-Level 0.8 V
D
CLK
CLK Duty cycle 20% 80%
Thermal shutdown 160 175 °C
Thermal Shutdown
Thermal shutdown hysteresis 10 °C
(1) The minimum PVIN voltage is 1.6V or (V
OUT
+ 0.9V), whichever is greater. VIN must be greater than 4.5V.
(2) The maximum PVIN voltage is 14.5V or (15 x V
OUT
), whichever is less.
(3) 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 R
SET
resistor.
(4) This control pin has an internal pullup. If this pin is left open circuit, the device operates when input power is applied. A small low-
leakage MOSFET is recommended for control. See the application section for further guidance.
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