Datasheet

TPS5402
www.ti.com SLVSBK4 –SEPTEMBER 2012
ELECTRICAL CHARACTERISTICS
T
A
= -40°C to 125°C, V
IN
= 12 V (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
INPUT SUPPLY
V
IN
Input Voltage range 3.5 28 V
Non switching quiescent power supply
IDD
Q_nsw
V
SENSE
> 0.9 V 100 µA
current
Rising V
IN
3.5 V
UVLO V
IN
under voltage lockout
Hysteresis 200 mV
FEEDBACK AND ERROR AMPLIFIER
V
SENSE
Regulated output voltage V
IN
= 12 V 0.776 0.8 0.824 V
-2 µA < I
COMP
< 2 µA,
G
m_EA
Error amplifier trans-conductance 92 µs
V
COMP
= 1 V
I
gm
Error amplifier source/sink current V
COMP
= 1 V, 100 mV overdrive ±7 µA
G
m_SRC
COMP voltage to inductor current Gm V
IN
= 12 V 9 A/V
PFM MODE AND SOFT-START
Pulse skipping mode switch current
I
th
300 mA
threshold
I
SS
Charge current 2 µA
OSCILLATOR
f
SW_BK
Switching frequency range Set by external resistor ROSC 50 1100 kHz
ROSC = GND 70
f
SW
Programmable frequency ROSC = OPEN 120 kHz
ROSC = 85.5 kΩ 300
Frequency spread spectrum in
f
jitter
V
IN
= 12 V ±6 %
percentage of f
SW
Jittering swing frequency in percentage
f
swing
V
IN
= 12 V 1/512
of f
SW
t
min_on
Minimum on time V
IN
= 12 V, T
A
= 25°C 200 ns
D
max
Maximum duty ratio V
IN
= 12 V 93 %
CURRENT LIMIT
I
LIMIT
Peak inductor current limit V
IN
= 12 V 2.2 2.5 3.1 A
MOSFET ON-RESISTANCE
R
dson_HS
On resistance of high side FET V
IN
= 12 V 120 240 mΩ
THERMAL SHUTDOWN
T
TRIP
Thermal protection trip point Rising temperature 165 °C
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