Datasheet

ELECTRICAL CHARACTERISTICS
TPS62250
www.ti.com .......................................................................................................................................................................................... SLVS842 – SEPTEMBER 2008
Over full operating ambient temperature range, typical values are at T
A
= 25 ° C. Unless otherwise noted, specifications apply
for condition V
IN
= EN = 3.6V. External components C
IN
= 4.7 µ F 0603, C
OUT
= 10 µ F 0603, L = 2.2 µ H, see the parameter
measurement information.
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
SUPPLY
V
IN
Input voltage range 2.3 6 V
I
OUT
= 0 mA, PFM mode enabled
15
(MODE = GND) device not switching
µ A
I
OUT
= 0 mA, PFM mode enabled
(MODE = GND) device switching, V
OUT
= 1.8 V, 18.5
I
Q
Operating quiescent current
See
(1)
I
OUT
= 0 mA, switching with no load
(MODE = V
IN
), PWM operation, V
OUT
= 1.8 V, 3.8 mA
V
IN
= 3 V
I
SD
Shutdown current EN = GND 0.1 1 µ A
Falling 1.85
UVLO Undervoltage lockout threshold V
Rising 1.95
ENABLE, MODE
High level input voltage, EN, 2 V ≤ V
IN
≤ 6 V 1 VIN
V
IH
V
MODE
Low level input voltage, EN, 2 V ≤ V
IN
≤ 6 V 0 0.4
V
IL
V
MODE
I
IN
Input bias current, EN, MODE EN, MODE = GND or VIN 0.01 1 µ A
POWER SWITCH
High side MOSFET on-resistance 240 480
R
DS(on)
V
IN
= V
GS
= 3.6 V, T
A
= 25 ° C m Ω
Low side MOSFET on-resistance 185 380
Forward current limit MOSFET
I
LIMF
V
IN
= V
GS
= 3.6 V 0.8 1 1.2 A
high-side and low side
Thermal shutdown Increasing junction temperature 140
T
SD
° C
Thermal shutdown hysteresis Decreasing junction temperature 20
OSCILLATOR
f
SW
Oscillator frequency 2 V ≤ V
IN
≤ 6 V 2 2.25 2.5 MHz
OUTPUT
V
OUT
Adjustable output voltage range 0.6 V
IN
V
V
ref
Reference voltage 600 mV
MODE = V
IN
, PWM operation, for fixed output
Feedback voltage PWM Mode voltage versions V
FB
= V
OUT
, – 1.5% 0% 1.5%
2.5 V ≤ V
IN
≤ 6 V, 0 mA ≤ I
OUT
≤ 600 mA
(2)
V
FB
MODE = GND, device in PFM mode, voltage
Feedback voltage PFM mode 1%
positioning active
(1)
Load regulation PWM Mode -0.5 %/A
Time from active EN to reach 95% of V
OUT
500
t
Start Up
Start-up time µ s
nominal
t
Ramp
V
OUT
ramp up time Time to ramp from 5% to 95% of V
OUT
250 µ s
I
lkg
Leakage current into SW pin V
IN
= 3.6 V, V
IN
= V
OUT
= V
SW
, EN = GND
(3)
0.1 1 µ A
(1) In PFM mode, the internal reference voltage is set to typ. 1.01 × V
ref
. See the parameter measurement information.
(2) For V
IN
= V
O
+ 0.6 V
(3) In fixed output voltage versions, the internal resistor divider network is disconnected from FB pin.
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