Datasheet

TPS2480
TPS2481
SLUS939B –APRIL 2010–REVISED DECEMBER 2010 www.ti.com
ELECTRICAL CHARACTERISTICS
over operating free-air temperature range (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
Supply Current (VCC)
Enabled V
EN
= Hi V
SENSE
= V
OUT
= V
VCC
450 1000
I
VCC
mA
Disabled V
EN
= Lo V
SENSE
= V
VCC
= V
OUT
= 0 90 250
Quiescent current operating 0.7 1.0 mA
I
VS
Quiescent current Power down mode 6 15 mA
V
POR
Power On reset threshold 2 V
Current Sense Input (SENSE)
I
SENSE
Input bias current V
SENSE
= V
VCC
V
OUT
= V
VCC
7.5 20 mA
Reference Voltage Output (VREF)
V
REF
Reference voltage 0 < I
VREF
< 1 mA 3.9 4 4.1 V
Power Limiting Input (PROG)
Input bias current; device
I
PROG
0 < V
PROG
< 4 V V
EN
= 48 V 5 mA
enabled; sourcing or sinking
Pulldown resistance; device
R
PROG
I
PROG
= 200 mA; V
EN
= 0 V 375 600 Ω
disabled
Power Limiting and Current Limiting (SENSE)
Current sense threshold
V
PROG
= 2.4 V; V
OUT
= 0 V or V
PROG
= 0.9 V; V
OUT
V
CL
V(VCC-SENSE) with power 17 25 33
= 30 V; V
VCC
= 48 V
limiting trip
mV
Current sense threshold
V
SENSE
V(VCC-sense) without power V
PROG
= 4 V; V
SENSE
= V
OUT
45 50 55
limiting trip
V
PROG
= 4 V; V
OUT
= V
SENSE
; V
(VCC-SENSE)
: 0
Large overload response time
t
F_TRIP
rising to 200 mV; C
(GATE-OUT)
= 2 nF; V
(GATE-OUT)
= 1.2 ms
to GATE low
1 V
Timer Operation (TIMER)
V
TIMER
= 0 V 15.0 25.0 34.0
I
SOURCE
Charge current (sourcing)
V
TIMER
= 0 V; T
J
= 25°C 20.0 25.0 30.0
mA
V
TIMER
= 5 V 1.50 2.5 3.70
I
SINK
Discharge current (sinking)
V
TIMER
= 5 V; T
J
= 25°C 2.10 2.5 3.10
TIMER upper threshold
3.9 4.0 4.1
voltage
V
TIMER lower reset threshold
TPS2481 only 0.96 1.0 1.04
voltage
D
RETRY
Fault retry duty cycle TPS2481 only 0.5% 0.75% 1.0%
Gate Drive Output (GATE)
I
GATE
GATE sourcing current V
SENSE
= VVCC; V(GATE-OUT) = 7 V; VEN = Hi 15 22 35 mA
V
EN
= Lo; V
GATE
= V
VCC
1.8 2.4 2.8
GATE sinking current mA
V
EN
= Hi; V
GATE
= V
VCC
; V
(VCC-SENSE)
³ 200 mV 75 125 250
V
GATE-OUT
GATE output voltage 12 16 V
Propagation delay: EN going V
EN
= 0 → 2.5 V, 50% of V
EN
to 50% of V
GATE
,
t
D_ON
25 40
true to GATE output high V
OUT
= V
VCC
, R
(GATE-OUT)
= 1 MOhm
Propagation delay: EN going
V
EN
= 2.5 V → 0 V, 50% of V
EN
to 50% of V
GATE
,
t
D_OFF
false (0 V) to GATE output 0.5 1 ms
V
OUT
= V
VCC
, R
(GATE-OUT)
= 1 MΩ, t
FALL
< 0.1 ms
low
Propagation delay: TIMER V
TIMER
: 0 → 5 V, t
RISE
< 0.1 ms. 50% of V
TIMER
to
0.8 1
expires to GATE output low 50% of V
GATE
, V
OUT
= V
CC
, R
(GATE-OUT)
= 1 MΩ,
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