TPS65286_15 Datasheet, PDF (1/46 Pages) Texas Instruments – TPS65286 Dual Power Distribution Switches With 4.5-V to 28-V Input Voltage, 6-A Output Current Synchronous Buck Regulator

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TPS65286
SLVSCG1 – MARCH 2014
TPS65286 Dual Power Distribution Switches With 4.5-V to 28-V Input Voltage,
6-A Output Current Synchronous Buck Regulator
1 Features
•1 Integrated Dual Power Distribution Switches:
– 2.5 V to 6 V Operating Input Voltage Range
– Integrated Back-to-Back Power MOSFETs
With Typical 100-mΩ On-Resistance
– Adjustable Current Limiting from 75 mA to
2.7 A
– ±6% Current-Limit Accuracy at 1.2 A (Typical)
– Latch-off Over Current Protection Versions
– Reverse Input-Output Voltage Protection
– Built-In Soft-Start
• Integrated Buck DCDC Converter:
– 4.5 V to 28 V Wide Input Voltage Range
– Maximum Continuous 6-A Output Load
Current
– Feedback Reference Voltage 0.6 V ±1%
– Fixed 500-kHz Switching Frequency
– Built-In Internal Soft-Start Time: 1 ms
– Cycle-by-Cycle Current Limit
– Adjustable Current Limit Threshold
– Output Over-Voltage Protection
– External Clock Synchronization
– Over Temperature Protection
2 Applications
• USB Ports and USB Hubs
• Digital TV
• Computing Power
• Laptop Dock
• Car Infotainment
• Monitoring
3 Description
The TPS65286 is a full featured 4.5-V to 28-V V_IN,
6-A output current synchronous step down DCDC
converter, which is optimized for small designs
through high efficiency and integrating the high-side
and low-side MOSFETs. The device also
incorporates dual N-channel MOSFET power
switches for power distribution systems. This device
provides a total power distribution solution, where
precision current limiting and fast protection response
are required.
A dual 100-mΩ independent power distribution switch
limits the output current to a programmable current
limit threshold between typical 50 mA~2.7 A by using
an external resistor. The current limit accuracy can be
achieved as tightly as ±6% at typical 1.2 A. The
nFAULT output asserts low under over-current and
reverse-voltage conditions.
Constant frequency peak current mode control in the
DCDC converter simplifies the compensation and
optimizes transient response. Cycle-by-cycle over-
current protection and operating in hiccup mode limit
MOSFET power dissipation. When die temperature
exceeds thermal over loading threshold, the over
temperature protection shuts down the device.
Device Information
ORDER NUMBER
PACKAGE
BODY SIZE
TPS65286RHD
VQFN (28)
5 mm x 5 mm
4 Simplified Schematic
C11
22 _SS
FB 23 _FB
C2
R3
R4
R5
24 _COMP
R2
25 _RLIM
26 _RSET1
27 _RSET2
28 _AGND
L1
C10
TPS65286
+5V
R7
C7 R5
C5
nFAULT1
14
nFAULT2
FB
R8
R6
nFAULT2
13
SW_EN1
SW_EN2 ¹²
SW_OUT1 ¹¹
SW_EN1
SW_EN2
USB Data
C8
SW_OUT2 ¹⁰
EN ⁹
MODE/ 8
SYNC
ENable
C9
USB Data
C4
VIN
C3
1
Efficiency
100
90
80
70
60
50
40
30
20
10 ^{Efficiency at V}OUT ^{= 5 V,}
f_SW = 500 kHz
0
0.01
0.1
1
Loading (A)
12V
24V
10
C020
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.