Datasheet

TPS53313
SLUSAS8 –DECEMBER 2011 www.ti.com
ELECTRICAL CHARACTERISTICS
over operating free-air temperature range, V
VIN
= 12 V, PGND = GND (Unless otherwise noted (unless otherwise noted)
PARAMETER CONDITIONS MIN TYP MAX UNIT
INPUT SUPPLY
V
VIN
VIN supply voltage Nominal input voltage range 4.5 16.0 V
V
POR
VIN POR threshold Ramp up; EN =HIGH 4.00 4.23 4.40 V
V
POR(hys)
VIN POR hysteresis 200 mV
I
STBY
Standby current EN =LOW. V
IN
= 12 V 58 µA
R
BOOT
Bootstrap on-resistance 10 Ω
REFERENCE
V
VREF
Internal precision reference voltage 0.6 V
TOL
VREF
VREF tolerance –1% 1%
ERROR AMPLIFIER
UGBW
(1)
Unity gain bandwidth 14 MHz
A
OL
(1)
Open loop gain 80 dB
I
FBINT
FB input leakage current Sourced from FB pin 50 nA
I
EA(max)
Output sinking and sourcing current 5 mA
SR
(1)
Slew rate 5 V/µs
ENABLE
R
ENPD
(1)
Enable pull-down resistor 800 kΩ
V
ENH
EN logic high V
VIN
= 4.5 V 1.8 V
V
ENHYS
EN hysteresis V
VIN
= 4.5 V 0.6 V
V
EN
= 0 V 1
I
EN
EN pin current V
EN
= 3.3V 3.3 5.0 µA
V
EN
= 14 V 17.8 27.5
SOFT-START
t
SS_1
Delay after EN asserts EN = High 0.65 ms
0 V ≤ V
SS
≤ 0.6 V, 39-kΩ or no resistor to
1
MODE/SS pin
0 V ≤ V
SS
≤ 0.6 V, 20-kΩ or 160-kΩ resistor to
t
SS_2
Soft start ramp_up time 3 ms
MODE/SS pin
0 V ≤ V
SS
≤ 0.6 V, 10-kΩ or 82-kΩ resistor to
6
MODE/SS pin
V
SS
= 0.6 V to PGD (SSOK) going high,
t
PGDENDLY
PGD startup delay time 0.2 ms
t
SS
= 1 ms
RAMP
4.5 V ≤ V
VIN
≤ 14.4 V V
VIN
/9 V
Ramp amplitude
14.4 V ≤ V
VIN
≤ 16 V 1.6
PWM
t
MIN(off)
Minimum OFF-time f
SW
= 1 MHz 150 ns
t
MIN(on)
Minimum ON-time No load 90 ns
D
MAX
Maximum duty cycle f
SW
= 1 MHz 80%
SWITCHING FREQUENCY
f
SW
Switching frequency tolerance f
SW
= 1 MHz, R
T
= 45.3 kΩ –10% 10%
SOFT DISCHARGE
R
SFTDIS
Soft-discharge transistor resistance EN = Low, V
IN
= 4.5 V, V
OUT
= 0.6 V 120 Ω
(1) Ensured by design. Not production tested.
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