Datasheet

TPS62420, TPS62421
SLVS676C –JUNE 2006–REVISED JUNE 2010 www.ti.com
ELECTRICAL CHARACTERISTICS (continued)
V
IN
= 3.6V, V
OUT
= 1.8V, EN = V
IN
, MODE = GND, L = 2.2mH, C
OUT
= 20mF, T
A
= –40°C to 85°C typical values are at T
A
=
25°C (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
t
timeout
Timeout for entering power save MODE/DATA Pin changes from high to low 520 ms
mode
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 mA
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 mA
V
IN
= open, V
SW
= 6.0V, EN = GND
(4)
I
LIMF
Forward Current OUT1 600mA 2.5V ≤ V
IN
≤ 6.0V 0.85 1.0 1.15 A
Limit PMOS and
OUT2 1000mA 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
Voltage positioning active, MODE/DATA = GND,
1.01x
V
OUT (PFM)
device operating in PFM mode, VIN = 2.5V to –1.5% 2.5%
V
OUT
5.0V
(6) (7)
DC output voltage accuracy PFM
mode, adjustable and fixed output MODE/DATA = GND; device operating in PWM
–1% 0% 1%
voltage
(5)
Mode VIN = 2.5V to 6.0V
(7)
V
OUT
V
IN
= 2.5V to 6.0V, Mode/Data = V
IN
, Fixed PWM
–1% 0% 1%
operation, 0mA < I
OUT
< I
OUTMAX
(8)
DC output voltage load regulation PWM operation mode 0.5 %/A
t
Start up
Start-up time Activation time to start switching
(9)
170 ms
t
Ramp
V
OUT
Ramp UP time Time to ramp from 5% to 95% of V
OUT
750 ms
(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 2.2mH, C
OUT
typ 20mF, 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 ms 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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