Datasheet

TPS2490
TPS2491
www.ti.com SLVS503D –NOVEMBER 2003–REVISED JULY 2012
ELECTRICAL CHARACTERISTICS
unless otherwise noted, minimum and maximum limits apply across the recommended operating junction temperature and
voltage range, V
TIMER
= 0 V, and all outputs unloaded; typical specifications are at T
J
= 25°C, V
VCC
= 48 V, V
TIMER
= 0 V, and
all outputs unloaded; positive currents are into pins.
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
SUPPLY CURRENT (VCC)
Enabled V
EN
= Hi, V
SENSE
= V
OUT
= V
VCC
450 1000 µA
Disabled V
EN
= Lo, V
SENSE
= V
VCC
= V
OUT
90 250 µA
CURRENT SENSE INPUT (SENSE)
I
SENSE
Input bias current V
SENSE
= V
VCC
, V
OUT
= V
VCC
7.5 20 µA
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 enabled, sourcing or
I
PROG
0 < V
PROG
< 4 V, V
EN
= 48 V 5 µA
sinking
R
PROG
Pulldown resistance, device disabled I
PROG
= 200 µA, V
EN
= 0 V 375 600 Ω
POWER LIMITING AND CURRENT LIMITING (SENSE)
Current sense threshold V
(VCC-SENSE)
with V
PROG
= 2.4 V, V
OUT
= 0 V or
V
CL
17 25 33 mV
power limiting trip V
PROG
= 0.9 V, V
OUT
= 30 V, V
VCC
= 48 V
V
SENSE
Current sense threshold V
(VCC-SENSE)
without V
PROG
= 4 V, V
SENSE
= V
OUT
45 50 55 mV
power limiting trip
V
PROG
= 4 V, V
OUT
= V
SENSE
,
t
F_TRIP
Large overload response time to GATE low V
(VCC-SENSE)
: 0 → 200 mV, 1.2 µs
C
(GATE-OUT)
= 2 nF, V
(GATE-OUT)
= 1 V
TIMER OPERATION (TIMER)
V
TIMER
= 0 V 15.0 25.0 34.0 µA
Charge current (sourcing)
V
TIMER
= 0 V, T
J
= 25°C 20.0 25.0 30.0 µA
V
TIMER
= 5 V 1.50 2.5 3.70 µA
Discharge current (sinking)
V
TIMER
= 5 V, T
J
= 25°C 2.10 2.5 3.10 µA
TIMER upper threshold voltage 3.9 4 4.1 V
TIMER lower reset threshold voltage TPS2491 only 0.96 1.0 1.04 V
D
RETRY
Fault retry duty cycle TPS2491 only 0.5% 0.75% 1.0%
GATE DRIVE OUTPUT (GATE)
V
SENSE
= V
VCC
, V
(GATE-OUT)
= 7 V,
I
GATE
GATE sourcing current 15 22 35 µA
V
EN
= Hi
V
EN
= Lo, V
GATE
= V
VCC
1.8 2.4 2.8 mA
GATE sinking current
V
EN
= Hi, V
GATE
= V
VCC
, 75 125 250 mA
V
(VCC-SENSE)
≥ 200 mV
GATE output voltage, V
(GATE-OUT)
12 16 V
Propagation delay: EN going true to GATE V
EN
= 0 → 2.5 V, 50% of V
EN
to 50% of
t
D_ON
25 40 µs
output high V
GATE
, V
OUT
= V
VCC
, R
(GATE-OUT)
= 1 MΩ
V
EN
= 2.5 V → 0, 50% of V
EN
to 50% of
Propagation delay: EN going false (0 V) to
t
D_OFF
V
GATE
, V
OUT
= V
VCC
, 0.5 1 µs
GATE output low
R
(GATE-OUT)
= 1 MΩ, t
FALL
< 0.1 µs
V
TIMER
: 0 → 5 V, t
RISE
< 0.1 µs, 50% of
Propagation delay: TIMER expires to GATE
V
TIMER
to 50% of V
GATE
, V
OUT
= V
VCC
, 0.8 1 µs
output low
R
(GATE-OUT)
= 1 MΩ,
Copyright © 2003–2012, Texas Instruments Incorporated 3