TPS54418_15 Datasheet, PDF (6/40 Pages) Texas Instruments – TPS54418 2.95-V to 6-V Input, 4-A Output, 2-MHz , Synchronous Step-Down Switcher With Integrated FETs (SWIFT™)

TPS54418
SLVS946D – SEPTEMBER 2009 – REVISED DECEMBER 2014
Electrical Characteristics (continued)
–40°C ≤ T_J ≤ 150°C, 2.95 ≤ V_VIN ≤ 6 V (unless otherwise noted) over operating free-air temperature range
PARAMETER
TEST CONDITIONS
MIN
TYP
HIGH-SIDE POWER MOSFET (PH)
Measured at 50% points on PH, I_OUT = 4
60
t_ON(min)
Minimum on time
Measured at 50% points on PH, V_VIN = 5 V,
I_OUT = 0 A
110
t_OFF(min)
Minimum off time
Prior to skipping off pulses,
(V_BOOT – V_PH) = 2.95 V, I_OUT = 4
60
t_RISE
Rise time
V_VIN = 5 V
1.5
t_FALL
Fall time
V_VIN = 5 V
1.5
BOOT (BOOT)
R_BOOT
BOOT charge resistance
V_VIN = 5 V
16
V_UVLO(Boot) BOOT-PH UVLO
V_VIN = 2.95 V
2.1
SOFT-START (SS )
I_CHG
V_SSxREF
V_DSCHG(SS)
I_DSCHG(SS)
Charge current
SS to reference crossover
V_SS = 0.4 V
98% nominal
SS discharge voltage (overload) V_VSENSE = 0 V
SS discharge current (UVLO,
EN, thermal fault)
V_VIN = 5 V, V_SS = 0.5 V
1.8
0.9
20
1.25
POWER GOOD (PWRGD)
V_TH(PG)
V_HYST(PG)
I_PH(lkg)
R_PG
V_OL
V_MIN(PG)
VSENSE threshold
Hysteresis
Output high leakage
Power Good on-resistance
Low-level output voltage
Minimum input voltage for valid
output
V_VSENSE falling (fault)
V_VSENSE rising (good)
V_VSENSE rising (fault)
V_VSENSE falling (Good)
V_VSENSE falling
V_VSENSE = V_REF, V_PWRGD = 5.5 V
I_PWRGD = 3.5 mA
V_PWRGD < 0.5 V , I_OUT = 100 μA
91%
93%
107%
105%
2%
2
100
0.3
1.2
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MAX UNIT
ns
ns
V/ns
V/ns
Ω
V
μA
V
μA
mA
V_REF
nA
Ω
V
1.6 V
6
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