Datasheet

TPS2500, TPS2501
SLVS886C –OCTOBER 2008–REVISED AUGUST 2010 www.ti.com
ELECTRICAL CHARACTERISTICS — Boost Section Only (continued)
over recommended operating conditions (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
OVERVOLTAGE PROTECTION
1.05 ×
V
OVP
AUX overvoltage shutdown AUX rising V
V
AUX
POWER STAGE
Switch on resistance (SWN) 80 120 mΩ
Peak switch current limit, cycle-by-cycle (SWN
I
SW
3 4.5 6
MOSFET)
A
I
UPPER
6.7
Switch on-resistance (SWP) 85 125
mΩ
Switch on-resistance (SWP + USB) V
IN
> V
NFM
125 185
START-UP
I
START
Constant current 2.3 2.65 3 A
Constant-current exit threshold (AUX voltage
V
EXIT
700 mV
where converter starts switching), V
IN
- V
AUX
BOOST ENABLE (EN)
Enable threshold, boost converter 0.7 1 V
I
EN
Input current V
EN
= 0 V or 5.5 V –0.5 0.5 mA
ELECTRICAL CHARACTERISTICS — USB Section Only
over recommended operating conditions (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
USB
r
USB
USB switch resistance 50 80 mΩ
t
r
Rise time, output 2 3 ms
V
AUX
= 5.1 V, C
L
= 100 mF, R
L
= 10 Ω,
R
ILIM
= 20 kΩ
t
f
Fall time, output 2.5 3.5 ms
USB ENABLE (ENUSB)
Enable threshold, USB switch 0.7 1.0 V
I
ENUSB
Input current V
ENUSB
= 0 V or 5.25 V –0.5 0.5 mA
Turnon time 5 ms
C
L
= 100 mF, R
L
= 10 Ω, R
ILIM
= 20 kΩ
Turnoff time 10 ms
FAULT
Output low voltage I
FAULT
= 1 mA 150 mV
Off-state current V
FAULT
= 5.25 V 1 mA
FAULT assertion or deassertion due to
t
DEG
FAULT deglitch 6 8 10 ms
overcurrent condition
V
TRIP
AUX threshold for FAULT trip AUX voltage falling 4.45 4.6 4.71 V
ILIM
R
ILIM
= 100 kΩ 190 285 380
I
OS
Short-circuit output current, V
IN
= 3.3 V R
ILIM
= 40 kΩ 550 712 875 mA
R
ILIM
= 20 kΩ 1140 1420 1700
t
IOS
Response time to short circuit V
AUX
= 5.1 V (see Figure 3) 5 ms
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