TPS51285A
TPS51285B
SLVSBX0 –APRIL 2013
www.ti.com
ELECTRICAL CHARACTERISTICS
over operating free-air temperature range, VVIN = 12 V, VVO1 = 5 V, VVFB1 = VVFB2 = 2 V, VEN1 = VEN2 = 3.3 V, VCLK: 200 Ω to
GND
(unless otherwise noted)
PARAMETER
TEST CONDITION
MIN
TYP
MAX
UNIT
SUPPLY CURRENT
TA = 25°C, No load, VVO1 = 0 V,
VVFB1 = VVFB2 = 2.06V
IVIN1
VIN supply current-1
84
μA
IVIN2
IVO1
VIN supply current-2
VO1 supply current
TA = 25°C, No load, VVFB1 = VVFB2 = 2.06 V
TA = 25°C, No load, VVFB1 = VVFB2 = 2.06 V
10
70
25
28
μA
μA
TPS51285A
TPS51285B
TA = 25°C, No load, VVO1 = 0 V,
VEN1= VEN2= 0 V
IVIN(STBY)
VIN stand-by current
μA
INTERNAL REFERENCE
VFBx VFB regulation voltage
TA = 25°C
TA = 25°C
1.99
1.98
2
2
2.01
2.02
0.1
V
V
IFBx
VFB Leakage Current
µA
VREG5 OUTPUT
TA = 25°C, No load, VVO1 = 0 V
4.9
4.85
4.85
4.55
100
5
5
5.1
5.1
5.1
5.1
VVIN > 7 V , VVO1= 0 V, IVREG5 < 100 mA
VVIN > 5.5 V , VVO1= 0 V, IVREG5 < 35 mA
VVIN > 5 V, VVO1= 0 V, IVREG5 < 20 mA
VVO1 = 0 V, VVREG5= 4.5 V, VVIN = 7 V
TA = 25°C, VVO1= 5 V, IVREG5= 50 mA
VVREG5
VREG5 output voltage
V
5
4.75
140
1.8
IVREG5
RV5SW
VREG5 current limit
5-V switch resistance
mA
Ω
VREG3 OUTPUT
VVIN > 7 V , VVO1= 0 V, IVREG3 < 100 mA
VVIN > 5.5 V , VVO1= 0 V, IVREG3 < 35 mA
3.217
3.234
3.3
3.3
3.383
3.366
0°C ≤ TA ≤ 85°C, VVIN > 5.5 V, VVO1= 0 V,
IVREG3 < 35 mA
VVREG3
VREG3 output voltage
3.267
3.3
3.333
V
0°C ≤ TA ≤ 85°C, VVIN > 5.5 V, IVREG3< 35 mA
VVIN > 5 V , VVO1= 0 V, IVREG3 < 35 mA
VVO1 = 0 V, VVREG3= 3.15 V, VVIN= 7 V
VVREG3 = 3.15 V, VVIN= 7 V
3.267
3.217
100
3.3
3.3
3.333
3.366
IVREG3-1
IVREG3-2
VREG3 current limit-1
VREG3 current limit-2
200
200
mA
100
DUTY CYCLE and FREQUENCY CONTROL
fsw1
CH1 frequency(1)
CH2 frequency(1)
Minimum off-time
TA = 25°C, VVIN= 20 V
TA = 25°C, VVIN= 20 V
TA = 25°C
400
475
300
kHz
kHz
ns
fSW2
tOFF(MIN)
200
400
MOSFET DRIVERS
Source, IDRVH = –50 mA, (VVBST – VSW) = 5 V
Sink, IDRVH = 50 mA, (VVBST – VSW) = 5 V
Source, IDRVL = –50 mA, VVREG5 = 5 V
Sink, IDRVL = 50 mA, VVREG5= 5 V
DRVH-off to DRVL-on
3
1.9
3
RDRVH
RDRVL
tD
DRVH resistance
Ω
Ω
DRVL resistance
Dead time
0.9
12
20
ns
DRVL-off to DRVH-on
INTERNAL BOOT STRAP SWITCH
RVBST (ON)
IVBSTLK
Boost switch on-resistance
VBST leakage current
TA = 25°C, IVBST = 10 mA
TA = 25°C
13
Ω
1
µA
CLOCK OUTPUT
VCLK on-resistance (pull-up)
TA = 25°C, VCLK: Open
TA = 25°C, VCLK: Open
TA = 25°C, VCLK: Open
10
10
RVCLK
Ω
VCLK on-resistance (pull-down)
Clock frequency
fCLK
256
kHz
(1) Specified by design. Not production tested.
6
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