TPS51124 Datasheet, PDF (4/22 Pages) Texas Instruments – DUAL SYNCHRONOUS STEP-DOWN CONTROLLER FOR LOW VOLTAGE POWER RAILS

TPS51124
SLVS616A – NOVEMBER 2005 – REVISED NOVEMBER 2005
ELECTRICAL CHARACTERISTICS (Continued)
over operating free-air temperature range, V5IN = V5FILT = 5 V (unless otherwise noted)
PARAMETER
UVLO/LOGIC THRESHOLD
V_UV5VFILT V5FILT UVLO threshold
V_EN
ENx threshold
I_EN
ENx input current
V_TONSEL TONSEL threshold
TEST CONDITIONS
Wake up
Hysteresis
Wake up
Hysteresis
Absolute value⁽¹⁾
Fast ⁽¹⁾
Medium ⁽¹⁾
MIN
3.7
0.2
1.0
V5FILT
–0.3
2
Slow ⁽¹⁾
I_TONSEL
TONSEL input current
TONSEL=0V, current out of the pin⁽¹⁾
TONSEL=5V, current in to the pin⁽¹⁾
CURRENT SENSE
I_TRIP
TC_ITRIP
V_OCLoff
V_ZC
TRIP source current
I_TRIP temperature coeffficent
OCP compensation offset
Zero cross detection comparator
offset
VTRIPx < 0.3 V, T_A = 25°C
On the basis of 25°C⁽¹⁾
(V_TRIPx-GND– V_PGNDx-LLx) voltage,
V_TRIPx-GND = 60 mV
VPGNDx-LLx voltage, PGOODx = Hi⁽¹⁾
V_Rtrip
Current limit threshold setting
range
V_TRIPx-GND voltage, all temperatures⁽¹⁾
POWER-GOOD COMPARATOR
PG in from lower (PGOODx goes hi)
V_THPG
PG threshold
PG low hysteresis (PGOODx goes low)
PG in from higher (PGOODx goes hi)
PG high hysteresis (PGOODx goes low)
I_PGMAX
PG sink current
PGOODx = 0.5 V
T_PGDEL
PG delay
Delay for PG in
OUTPUT UNDERVOLTAGE AND OVERVOLTAGE PROTECTION
V_OVP
T_OVPDEL
V_UVP
Output OVP trip threshold
Output OVP prop delay
Output UVP trip threshold
OVP detect
UVP detect
Hysteresis (recovery < 20 µs)
T_UVPDEL Output UVP delay
T_UVPEN
Output UVP enable delay
THERMAL SHUTDOWN
After 1.7 × Tss, UVP protection engaged
T_SDN
Thermal shutdown threshold
Shutdown temperature⁽¹⁾
Hysteresis ⁽¹⁾
9
–10
30
92.5%
102.5%
2.5
400
110%
65%
20
1.4
TYP
4.0
0.3
1.3
0.2
0.02
1
1
10
4200
0
0.5
95%
–5%
105%
5%
5.0
510
115%
1.5
70%
10%
32
2
160
10
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MAX UNIT
4.3 V
0.4 V
1.5 V
V
0.1 µA
V
V5FILT
–1.0
V
0.5 V
µA
µA
11 µA
ppm/°C
10 mV
mV
200 mV
97.5%
107.5%
mA
620 µs
120%
µs
75%
40 µs
2.4 ms
°C
(1) Ensured by design. Not production tested.
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