TPS54319_15 Datasheet, PDF (4/36 Pages) Texas Instruments – 2.95-V to 6-V Input, 3-A Output, 2-MHz, Synchronous Step-Down Switcher With Integrated FETs ( SWIFT™)

TPS54319
SLVSA83 – JUNE 2010
ELECTRICAL CHARACTERISTICS (continued)
T_J = –40°C to 150°C, VIN = 2.95 to 6 V (unless otherwise noted)
DESCRIPTION
CONDITIONS
TIMING RESISTOR AND EXTERNAL CLOCK (RT/CLK PIN)
Switching frequency range using RT mode
Switching frequency
Rt = 400 kΩ
Switching frequency range using CLK mode
Minimum CLK pulse width
RT/CLK voltage
R(RT/CLK)= 400kΩ
RT/CLK high threshold
RT/CLK low threshold
RT/CLK falling edge to PH rising edge delay Measure at 500 kHz with RT resistor in series
PLL lock in time
Measure at 500 kHz
PH (PH PIN)
Minimum On time
Measured at 50% points on PH, IOUT = 3 A
Measured at 50% points on PH, VIN = 5 V,
IOUT = 0 A
Minimum Off time
Prior to skipping off pulses, BOOT-PH = 2.95 V,
IOUT = 3 A
Rise Time
Fall Time
VIN = 5 V, 3 A
BOOT (BOOT PIN)
BOOT Charge Resistance
VIN = 5 V
BOOT-PH UVLO
VIN = 2.95 V
SLOW START AND TRACKING (SS/TR PIN)
Charge Current
V(SS/TR) = 0.4 V
SS/TR to VSENSE matching
V(SS/TR) = 0.4 V
SS/TR to reference crossover
98% normal
SS/TR discharge voltage (Overload)
VSENSE = 0 V
SS/TR discharge current (Overload)
VSENSE = 0 V, V(SS/TR) = 0.4 V
POWER GOOD (PWRGD PIN)
VSENSE falling (Fault)
VSENSE threshold
VSENSE rising (Good)
VSENSE rising (Fault)
VSENSE falling (Good)
Hysteresis
VSENSE falling
Output high leakage
VSENSE = VREF, V(PWRGD) = 5.5 V
On resistance
Output low
I(PWRGD) = 3.0 mA
Minimum VIN for valid output
V(PWRGD) < 0.5 V at 100 mA
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MIN TYP MAX UNIT
300
2000 kHz
400 500 600 kHz
300
2000 kHz
75
ns
0.5
V
1.6 2.2 V
0.4 0.6
V
90
ns
14
ms
65
120
ns
60
ns
2.5
V/ns
2
16
Ω
2.2
V
2.2
mA
35
mV
1.1
V
46
mV
325
µA
91
% Vref
93
% Vref
107
% Vref
105
% Vref
2
% Vref
2
nA
100 200 Ω
0.3 0.6 V
1.2 1.6 V
4
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