Datasheet

TPS2500, TPS2501
www.ti.com SLVS886C –OCTOBER 2008–REVISED AUGUST 2010
Table 1. RECOMMENDED EXTERNAL COMPONENTS
MIN NOM MAX UNIT
L Inductor (nominal value) 2.2 4.7 mH
C
IN
Input capacitance on IN (ceramic capacitor, X5R, 10V, 0805) 10 mF
Boost output capacitance on AUX (ceramic capacitor, X5R, 10V, 1210) 22
C
AUX
mF
Additional AUX capacitance 150
R
ILIM
Current-limit set resistor from ILIM to GND (recommended 1% or better) 16.1 200 kΩ
ELECTRICAL CHARACTERISTICS — Shared Boost and USB Section
over recommended operating conditions (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
BIAS
V
IN
13 20
Quiescent V
IN
= 3.3 V, V
AUX
= 5.2 V, V
EN
= V
IN
, V
ENUSB
= V
AUX
,
mA
current I
AUX
= I
USB
= 0 A
V
AUX
380 480
Shutdown V
IN
= 3.3 V, V
EN
= V
ENUSB
= 0 V, AUX and USB OPEN,
V
IN
4 8 mA
current –40°C ≤ T
J
≤ 85°C
UVLO
Rising 2.08 2.2
Falling 1.69 1.8
After V
AUX
in
Undervoltage lockout threshold on
regulation
V
IN
Hysteresis 0.4 V
IN for boost converter
Falling 1.93 2.05
Before V
AUX
in
regulation
Hysteresis 0.15
Rising 4.18 4.3 4.45
Undervoltage lockout threshold on
V
AUX
Falling 4.1 4.21 4.37 V
AUX for USB switch
Hysteresis 0.09
THERMAL SHUTDOWN
Full thermal shutdown threshold 150
Hysteresis 10
°C
USB-only thermal shutdown 130
Hysteresis 10
ELECTRICAL CHARACTERISTICS — Boost Section Only
over recommended operating conditions (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
APPLICATION SPECIFICATIONS
V
AUX
AUX regulation voltage 4.95 5.1 5.25 V
OSCILLATOR
Switching frequency, normal mode V
IN
< V
LFM
925 1000 1075
freq kHz
Switching frequency, low-frequency mode V
IN
> V
LFM
230 250 270
V
IN
rising 4.25 4.35 4.45 V
V
LFM
Low-frequency mode input voltage threshold
Hysteresis 200 mV
V
IN
rising 4.9 5.05 5.17 V
No-frequency mode input voltage threshold
V
NFM
(boost SYNC MOSFET always on)
Hysteresis 75 mV
Maximum duty cycle 85 %
Minimum controllable on-time 85 ns
Eco-mode CONTROL SCHEME, PULSED FREQUENCY OPERATION (TPS2500 ONLY)
IIND
LOW
Demanded peak current to enter PFM mode Peak inductor current, falling 420 mA
0.98 ×
AUX
LOW
AUX-too-low comparator threshold Resume switching due to AUX, falling V
V
AUX
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