Datasheet

TPS2556
TPS2557
www.ti.com SLVS931A – NOVEMBER 2009– REVISED FEBRUARY 2012
RECOMMENDED OPERATING CONDITIONS
MIN MAX UNIT
V
IN
Input voltage, IN 2.5 6.5 V
V
EN
TPS2556 0 6.5
Enable voltage V
V
EN
TPS2557 0 6.5
V
IH
High-level input voltage on EN or EN 1.1
V
V
IL
Low-level input voltage on EN or EN 0.66
I
OUT
Continuous output current, OUT 0 5 A
Continuous FAULT sink current 0 10 mA
T
J
Operating virtual junction temperature –40 125 °C
R
ILIM
Recommended resistor limit range 20k 187k Ω
ELECTRICAL CHARACTERISTICS
over recommended operating conditions, V
/EN
= 0 V, or V
EN
= V
IN
(unless otherwise noted)
PARAMETER TEST CONDITIONS
(1)
MIN TYP MAX UNIT
POWER SWITCH
T
J
= 25°C 22 25
Static drain-source on-state
r
DS(on)
mΩ
resistance
–40 °C ≤T
J
≤ 125°C 35
V
IN
= 6.5 V 2 3 4
t
r
Rise time, output
V
IN
= 2.5 V 1 2 3
C
L
= 1 μF, R
L
= 100 Ω,
ms
(see Figure 2)
V
IN
= 6.5 V 0.6 0.8 1.0
t
f
Fall time, output
V
IN
= 2.5 V 0.4 0.6 0.8
ENABLE INPUT EN OR EN
Enable pin turn on/off threshold 0.66 1.1 V
Hysteresis 55
(2)
mV
I
EN
Input current V
EN
= 0 V or 6.5 V, V
/EN
= 0 V or 6.5 V –0.5 0.5 μA
t
on
Turn-on time 9 ms
C
L
= 1 μF, R
L
= 100 Ω, (see Figure 2)
t
off
Turn-off time 6 ms
CURRENT LIMIT
R
ILIM
= 24.9 kΩ 4130 4450 4695
Current-limit threshold (Maximum DC output current I
OUT
delivered to
I
OS
R
ILIM
= 61.9 kΩ 1590 1785 1960 mA
load) & Short-circuit current, OUT connected to GND
R
ILIM
= 100 kΩ 935 1100 1260
t
IOS
Response time to short circuit V
IN
= 5.0 V (see Figure 3) 3.5
(2)
μs
(1) Pulse-testing techniques maintain junction temperature close to ambient temperature; thermal effects must be taken into account
separately.
(2) These parameters are provided for reference only, and do no constitute part of TI's published specifications for purposes of TI's product
warranty.
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Product Folder Link(s): TPS2556 TPS2557