Datasheet

TPS62420-Q1
SLVSA56 –DECEMBER 2009 www.ti.com
ELECTRICAL CHARACTERISTICS (continued)
V
IN
= 3.6V, V
OUT
= 1.8V, EN = V
IN
, MODE = GND, L = 2.2μH, C
OUT
= 20μF, T
J
= T
A
= –40°C to 125°C (unless otherwise
noted). TYP values are at T
A
= 25°C
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
POWER SWITCH
R
DS(ON)
P-channel MOSFET on-resistance, V
IN
= V
GS
= 3.6V 280 620 mΩ
converter 1,2
I
LK_PMOS
P-channel leakage current V
DS
= 6.0V 1 μA
R
DS(ON)
N-channel MOSFET on-resistance V
IN
= V
GS
= 3.6V 200 450 mΩ
converter 1,2
I
LK_SW1/SW2
Leakage Current into SW1/SW2 Pin Includes N-Chanel leakage currnet, 6 7.5 μA
V
IN
= open, V
SW
= 6.0V, EN = GND
(4)
I
LIMF
Forward current OUT1, 600 mA 2.5V ≤ V
IN
≤ 6.0V 0.85 1.0 1.15 A
limit PMOS and
OUT2, 1000 mA 1.19 1.4 1.61
NMOS
T
SD
Thermal shutdown Increasing junction temperature 150 °C
Thermal shudown hysteresis Decreasing junction temperature 20 °C
OSCILLATOR
fSW Oscillator frequency 2.5V ≤ VIN ≤ 6.0V 2.0 2.25 2.5 MHz
OUTPUT
V
OUT
Adjustable output votage range 0.6 V
IN
V
V
ref
Reference voltage 600 mV
DC output voltage accuracy PFM Voltage positioning active, MODE/DATA = GND,
1.01 x
V
OUT (PFM)
mode, adjustable and fixed output device operating in PFM mode, VIN = 2.5V to –1.5% 2.5%
V
OUT
voltage
(5)
5.0V
(6) (7)
MODE/DATA = GND; device operating in PWM
–1% 0% 1%
Mode, VIN = 2.5V to 6.0V
(7)
V
OUT
DC output voltage load regulation V
IN
= 2.5V to 6.0V, MODE/DATA = V
IN
, Fixed
–1% 0% 1%
PWM operation, 0mA < I
OUT
< I
OUTMAX
(8)
PWM operation mode 0.5 %/A
t
Start up
Start-up time Activation time to start switching
(9)
170 μs
t
Ramp
V
OUT
ramp-up time Time to ramp from 5% to 95% of V
OUT
750 μs
(4) At pins SW1 and SW2 an internal resistor of 1MΩ is connected to GND
(5) Output voltage specification does not include tolerance of external voltage programming resistors
(6) Configuration L typ 2.2μH, C
OUT
typ 20μF, see parameter measurement information, the output voltage ripple depends on the effective
capacitance of the output capacitor, larger output capacitors lead to tighter output voltage tolerance
(7) In Power Save Mode, PWM operation is typically entered at I
PSM
= V
IN
/32Ω.
(8) For V
OUT
> 2.2V, V
IN
min = V
OUT
+0.3V
(9) This time is valid if one converter turns from shutdown mode (EN2 = 0) to active mode (EN2 =1) AND the other converter is already
enabled (e.g., EN1 = 1). In case both converters are turned from shutdown mode (EN1 and EN2 = low) to active mode (EN1 and/or
EN2=1) a value of typ 80 μs for ramp up of internal circuits needs to be added. After t
Start
the converter starts switching and ramps
V
OUT
.
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