Datasheet

TPS61251
www.ti.com SLVSAF7 –SEPTEMBER 2010
RECOMMENDED OPERATING CONDITIONS
MIN NOM MAX UNIT
Supply voltage at VIN 2.3 6.0 V
Output voltage at VOUT 3.0 6.5 V
Programable input current limit set by R
ILIM
100 1500 mA
Operating free air temperature range, T
A
–40 85 °C
Operating junction temperature range, T
J
–40 125 °C
ELECTRICAL CHARACTERISTICS
Over recommended free air temperature range, typical values are at T
A
= 25°C. Unless otherwise noted, specifications apply
for condition V
IN
= EN = 3.6 V, V
OUT
= 5.5 V.
DC/DC STAGE
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
V
FB
Feedback voltage 1.182 1.2 1.218 V
Maximum line regulation 2.3 V ≤ V
IN
≤ 6.0 V 0.5 %
Maximum load regulation 0.5 %
f Oscillator frequency 3500 kHz
High side switch on resistance 200 mΩ
r
DS(on)
Low side switch on resistance 130 mΩ
Reverse leakage current into V
OUT
EN = GND 3.5 µA
ILIM pin set to V
IN
1500 mA
I
IN(DC)
Programmable input average switch current limit ILIM pin set to GND 100 mA
R
ILIM
= 20 kΩ (500mA) -10 +10 %
PFM enabled, device is not switching 30 µA
I
Q
Quiescent current
SNOOZE mode, I
OUT
= 0 mA, current into
2 µA
V
IN
pin
V
IN
turned on when EN is connected to
I
SD
Shutdown current
(1)
0.85 3.5 mA
GND and no voltage is present at V
OUT
Falling 6.4 V
OVP Input over voltage protection threshold
Rising 6.5 V
CONTROL STAGE
Falling 2.0 2.1 V
V
UVLO
Under voltage lockout threshold
Hysteresis 0.1 V
V
IL
EN input low voltage 2.3 V ≤ V
IN
≤ 6.0 V 0.4 V
V
IH
EN input high voltage 2.3 V ≤ V
IN
≤ 6.0 V 1.0 V
EN, PG input leakage current Clamped on GND or V
IN
0.5 µA
Rising referred to V
FB
92.5 95 97.5 %
Power Good threshold voltage
Falling referred to V
OUT
2.3 V
Power good delay 50 µs
Overtemperature protection 140 °C
Overtemperature hysteresis 20 °C
(1) When the power good threshold is triggered the first time a comparator is turned on to observe the output voltage increasing the
shutdown current.
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