Datasheet

TPS51124
www.ti.com SLVS616B –NOVEMBER 2005–REVISED SEPTEMBER 2010
ELECTRICAL CHARACTERISTICS
over operating free-air temperature range, V5IN = V5FILT = 5 V (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
SUPPLY CURRENT
V5FILT current, no load,
I
V5FILT
V5FILT supply current EN1 = EN2 = 5 V, VFB1 = VFB2 = 0.77 V, 350 700 mA
LL1=LL2=0.5V
I
V5INSDN
V5IN shutdown current V5IN current, no load, EN1 = EN2 = 0 V 1 mA
I
V5FILTSD
V5FILT shutdown current V5FILT current, no load, EN1 = EN2 = 0 V 1 mA
N
VFB VOLTAGE and DISCHARGE RESISTANCE
V
VFB
VFB regulation voltage FB voltage, skip mode (f
PWM
/10) 764 mV
T
A
= 25°C, bandgap initial accuracy –0.9% 0.9%
VFB regulation voltage
V
VFB
T
A
= 0°C to 85°C
(1)
–1.3% 1.3%
tolerance
T
A
= –40°C to 85°C
(1)
–1.6% 1.6%
VFB regulation shift in 0.758-V target for resistor divider. See PWM Operation of
V
VFBSKIP
758 mV
continuous conduction Detailed Description
(1)
I
VFB
VFB input current VFBx = 0.758 V, absolute value 0.02 0.1 mA
R
Dischg
VO discharge resistance ENx = 0 V, VOx = 0.5 V, T
A
= 25°C 10 20 Ω
OUTPUT: N-CHANEEL MOSFET GATE DRIVERS
Source, V
VBSTx–DRVHx
= 0.5 V 5 7 Ω
R
DRVH
DRVH resistance
Sink, V
DRVHx-LLx
= 0.5 V 1.5 2.5 Ω
Source, V
V5IN–DRVLx
= 0.5 V 4 6 Ω
R
DRVL
DRVL resistance
Sink, V
DRVLx–PGNDx
= 0.5 V 1 2.0 Ω
DRVHx-low (DRVHx = 1 V) to DRVLx-on
10 20 50 ns
(DRVLx = 4 V), LL = –0.05 V,
T
D
Dead time
DRVLx-low (DRVLx = 1 V) to DRVHx-on
30 40 60 ns
(DRVHx = 4 V), LL = –0.05 V,
INTERNAL BST DIODE
V
FBST
Forward voltage V
V5IN–VBSTx
, I
F
= 10 mA, T
A
= 25°C 0.7 0.8 0.9 V
VBST = 34 V, LL = 28 V, VOx = 5.5 V,
I
VBSTLK
VBST leakage current 0.1 1 mA
T
A
= 25°C
ON-TIME TIMER CONTROL AND INTERNAL SOFT START,
T
ON11
CH1, 240-kHz setting VO1 = 1.5 V,TONSEL = GND, LL1 = 12 V 440 500 560 ns
T
ON12
CH1, 300-kHz setting VO1 = 1.5 V, TONSEL = FLOAT, LL1 = 12 V 340 390 440 ns
T
ON13
CH1, 360-kHz setting VO1 = 1.5 V,TONSEL = V5FILT, LL1 = 12 V 265 305 345 ns
T
ON21
CH2, 300-kHz setting VO2 = 1.05 V, TONSEL = GND, LL2 = 12 V 235 270 305 ns
T
ON22
CH2, 360-kHz setting VO2 = 1.05 V, TONSEL = FLOAT, LL2 = 12 V 180 210 240 ns
T
ON23
CH2, 420-kHz setting VO2 = 1.05 V, TONSEL = V5FILT, LL2 = 12 V 120 150 180 ns
T
ON(MIN)
CH2 On time VO2 = 0.76 V, TONSEL = V5FILT, LL2 = 28 V 80 110 140 ns
T
OFF(MIN)
CH1/CH2 Min. off time LL = –0.1 V, T
A
= 25°C, VFB = 0.7 V 435 ns
Internal soft start, time from ENx > 3 V to VFBx regulation value
T
ss
Internal SS time 0.85 1.2 1.40 ms
= 735 mV
(1) Specified by design. Not production tested.
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