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TPS65288 Datasheet(PDF) 9 Page - Texas Instruments

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No. de Pieza. TPS65288
Descripción  4.5-V to 18-V Input, High Current, Synchronous Step Down Three DC-DC Converter with Integrated FET
Descarga  35 Pages
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Fabricante  TI1 [Texas Instruments]
Página de inicio  http://www.ti.com
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TPS65288 Datasheet(HTML) 9 Page - Texas Instruments

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TPS65288
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SLVSBX3 – MAY 2013
ELECTRICAL CHARACTERISTICS (continued)
TJ = –40°C to 125°C, VIN = 12 V, fSW = 500 kHz (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
MOSFET (BUCK 2)
On resistance of high side FET on
H.S. Switch
25°C, BOOT = 6.5 V
120
m
Ω
CH2
On resistance of low side FET on
L.S. Switch
25°C, VIN = 12 V
80
m
Ω
CH2
MOSFET (BUCK 3)
On resistance of high side FET on
H.S. Switch
25°C, BOOT = 6.5 V
120
m
Ω
CH3
On resistance of low side FET on
L.S. Switch
25°C, VIN = 12 V
80
m
Ω
CH3
ERROR AMPLIFIER
gM
Error amplifier transconductance
-2 µA < ICOMP < 2 µA
130
µS
gmPS1
COMP to ILX gm of Buck1(1)
ILX = 0.5 A
10
A/V
gmPS2
COMP to ILX gm of Buck2 and 3(1)
ILX = 0.5 A
8
A/V
POWER GOOD RESET GENERATOR
Output falling
85
Threshold voltage for buck under
VUVBUCKX
%
Output rising (PG will be
voltage
90
asserted)
tUV_deglitch
Deglitch time (both edges)
11
ms
tON_HICCUP
Hiccup mode ON time
VUVBUCKX asserted
14
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
106
be forced off)
Threshold voltage for buck over
VOVBUCKX
%
voltage
Output falling (high side FET will
104
be allowed to switch )
Measured after the later of
tRP
minimum reset period
Buck1 or Buck3 power-up
100
ms
successfully
USB SWITCHES
VINUSB
USB input voltage range
2.5
6
V
0.66x
VIH_USB_EN
USB_EN high level input voltage
V3p3 = 3.2-3.4 V, VUSB_EN rising
V
V3p3
0.33x
VIL_USB_EN
USB_EN low level input voltage
V3p3 = 3.2-3.4 V, VUSB_EN falling
V
V3p3
Static drain-source on-state
USB_VIN = 5 V and
RDS_USB
135
m
resistance
Io_USB = 0.5 A, TJ = 2 5°C
Increasing USB_Vo current
ICS_USB
USB current limit
1.2
A
di/dt<1 A/s
VUSBx_nFAULT
USBx_nFAULT output voltage low
IUSB_nFAULT = 1 mA
150
mV
TUSB_TRIP
USB thermal trip point
Rising temperature
130
°C
TUSB_HYST
USB thermal trip hysteresis
Hysteresis
20
°C
USB_IN = 5 V, CL = 10 µF,
TD_on
Turn-on delay time
1.1
ms
RL = 100 Ω
TD_off
Turn-off delay time
1.6
ms
TIOS
Response time to short circuit
USB_IN = 5 V
2
µs
Fault assertion or de-assertion
TDEGLITCH(OCP)
Switch over current fault deglitch
8.8
ms
due to over-current condition
(1)
Specified by design.
Copyright © 2013, Texas Instruments Incorporated
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