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TPS65250RHAR Datasheet(PDF) 8 Page - Texas Instruments

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Part # TPS65250RHAR
Description  4.5-V TO 18-V INPUT, HIGH CURRENT, SYNCHRONOUS STEP DOWN THREE BUCK CONVERTER WITH INTEGRATED FET AND DYING GASP STORAGE AND RELEASE CIRCUIT
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

TPS65250RHAR Datasheet(HTML) 8 Page - Texas Instruments

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TPS65250
SLVSAA3 – JUNE 2010
www.ti.com
ELECTRICAL CHARACTERISTICS (continued)
VIN = 12 V ±5%, VINB2, VINB3 = 5 V ±5%, TJ = –40°C to 125°C, fSW = 1 MHz (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
VSYNCH
External clock threshold high
V3p3 = 3.3 V
1.55
V
VSYNCL
External clock treshold Low
V3p3 = 3.3 V
1.24
V
SYNCRANGE
Synchronization range
0.2
2.2
MHz
SYNCCLK_MIN
Sync signal minimum duty cycle
40
%
SYNCCLK_MAX
Sync signal maximum duty cycle
60
%
VIHLOW_P
Low power mode threshold high
V3p3 = 3.3 V
1.55
V
VILLOW_P
Low power mode treshold Low
V3p3 = 3.3 V
1.24
V
FEEDBACK, REGULATION, OUTPUT STAGE
VIN = 12 V , TJ = 25°C
-1%
0.8
1%
VFB
Feedback voltage
V
VIN = 4.5 to 18V
-2%
0.8
2%
D
Duty cycle range
5
95
%
Line regulation - DC
VINB = 4.5 V to 18 V,
VLINEREG
0.5
%/V
∆VOUT/∆VINB
IOUT = 1000 mA
Load regulation - DC
IOUT = 10 % - 90%
VLOADREG
0.5
%/A
∆VOUT/∆IOUT
IOUT,MAX
COUT
Output capacitance
Recommended fSW = 1.14 MHz
10
22
µF
L
Nominal Inductance
Recommended fSW = 1.14 MHz
4.7
µH
RDS_ON_HI_BUCK1
Turn-On resistance high side Buck1
VIN = 12 V, TJ = 25°C
95
m
RDS_ON_LO_BUCK1
Turn-On resistance low side Buck1
VIN = 12 V, TJ = 25°C
50
m
Turn-On resistance high side Buck2
RDS_ON_HI_BUCK23
VIN = 12 V, TJ = 25°C
120
m
and 3
Turn-On resistance low side Buck2
RDS_ON_LO_BUCK23
VIN = 12 V, TJ = 25°C
80
m
and 3
Transient VOUT variation during load
∆I = 1 A in ∆t =1 µs,
VUTTOLTRAN 1
1.5
%
transient measured at feedback point
CLOAD = 22 µF, ceramic
Transient VOUT variation during load
I = 0.75 A in
∆t = 1 µs,
VUTTOLTRAN 2
1.5
%
transient measured at feedback point
CLOAD = 22 µF, ceramic
Transient VOUT variation during load
I = 0.75 A in
∆t = 1 µs,
VUTTOLTRAN 3
1.5
%
transient measured at feedback point
CLOAD = 22 µF, ceramic
ILIMIT1
Peak inductor current limit range
1
4
A
ILIMIT2
Peak inductor current limit range
1
3
A
ILIMIT3
Peak inductor current limit range
1
3
A
POWER GOOD RESET GENERATOR
Output falling (device will be
85
disabled after tON_HICCUP )
Threshold voltage for buck under
VUVBUCKX
%
voltage
Output rising (PG will be
90
asserted)
tUV_deglitch
Deglitch time (both edges)
Each buck
11
ms
tON_HICCUP
Hiccup mode ON time
VUVBUCKX asserted
12
ms
All converters disabled. Once
tOFF_HICCUP elapses, all
tOFF_HICCUP
Hiccup mode OFF time
20
ms
converters will go through
sequencing again.
Output rising (high side fet will
109
be forced off)
Threshold voltage for buck over
VOVBUCKX
%
voltage
Output falling (high side fet will
107
be allowed to switch )
Measured after the later of
tRP
minimum reset period
Buck1 or Buck 3 power-up
1000
ms
successfully
8
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Copyright © 2010, Texas Instruments Incorporated
Product Folder Link(s): TPS65250


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