Datasheet
TPS61080
TPS61081
SLVS644D –FEBRUARY 2006–REVISED APRIL 2013
www.ti.com
ELECTRICAL CHARACTERISTICS (continued)
VIN = 3.6 V, EN = VIN, T
A
= –40°C to 85°C, typical values are at T
A
= 25°C (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
SOFT START
T
A
= 25°C 4.75 5 5.25
I
ss
Soft start bias current μA
4.6 5 5.4
V
clp
SS pin to FB pin accuracy V
SS
= 500 mV 487 500 513 mV
FEEDBACK FB
I
FB
Feedback input bias current V
FB
= 1.229 V –100 100 nA
V
FB
Feedback regulation voltage 1.204 1.229 1.254 V
POWER SWITCH AND DIODE
Isolation MOSFET on-resistance 0.06 0.1 Ω
R
DS(ON)
V
IN
= VGS = 3.6 V 0.17 0.22
N-channel MOSFET on-resistance Ω
V
IN
= VGS = 2.5 V 0.2 0.32
I
LN_NFET
N-channel leakage current V
DS
= 28 V 1 2 μA
V
F
Power diode forward voltage Id = 1 A 0.85 1 V
I
LN_ISO
Isolation FET leakage current L pin to ground 1 μA
OC AND SC
TPS61080, FSW = High or FSW = Low 0.5 0.7 1.0
I
LIM
N-Channel MOSFET current limit
(1)
A
TPS61081, FSW = High or FSW = Low 1.3 1.6 2.0
TPS61080 1.0 2.2
I
SC
Short circuit current limit A
TPS61081 2.0 3.5
t
scd
Short circuit delay time 13 μs
t
scr
Short circuit release time 57 ms
V
SC
OUT short detection threshold
(2)
V
IN
– V
OUT
1.4 V
OSCILLATOR
FSW pin high 1.0 1.2 1.5
f
S
Oscillator frequency MHz
FSW pin low 0.5 0.6 0.7
D
max
Maximum duty cycle FB = 1.0 V 90% 94%
D
min
Minimum duty cycle 5%
R
fsw
FSW pin pull down resistance 400 800 1600 kΩ
FSW high logic 1.6
V
FSW
V
FSW low logic 0.8
OVP
Output overvoltage protection V
OUT
rising 27 28 29 V
Vovp
Output overvoltage protection hysteresis V
OUT
falling 0.7 V
THERMAL SHUTDOWN
T
shutdown
Thermal shutdown threshold 160 °C
T
hysteresis
Thermal shutdown threshold hysteresis 15 °C
(1) V
IN
= 3.6 V, V
OUT
= 15 V, Duty cycle = 76%. See Figure 6 to Figure 9 for other operation conditions.
(2) OUT short circuit condition is detected if OUT stays lower than VIN – V
SC
for 1.7 ms after IC enables. See the START UP section for
details.
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