TPS54A20 Datasheet, PDF (1/43 Pages) Texas Instruments – 8-V to 14-V Input, 10-A, up to 10-MHz SWIFT Step Down Converter

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TPS54A20
SLVSCQ8A – DECEMBER 2015 – REVISED APRIL 2016
TPS54A20 8-V to 14-V Input, 10-A, up to 10-MHz SWIFT™ Step Down Converter
1 Features
•1 Two-phase, Synchronous Series Capacitor Buck
Converter
• Automatic Current Balancing Between Phases
• 2-MHz to 5-MHz Per Phase Switching Frequency
• 14-ns Minimum On-Time
• 0.51-V to 2-V Output Voltage Range with ±0.5%
Feedback Reference Voltage
• Input Overvoltage Lockout for 17-V Surge
Protection
• Adjustable Current Limit with Auto Restart
(Hiccup)
• Synchronizes to an External Clock
• Fixed Frequency in Steady State
• Adaptive On-Time Control
• Internal Feedback Loop Compensation
• Internal Gate Drive LDO with External Supply
Option
• EN Pin Allowing for Adjustable Input UVLO
• Selectable Soft-Start Time
• Monotonic Startup with Pre-biased Output
• Output Power Good Indicator (Open Drain)
• Output Overvoltage/Undervoltage Protection
Simplified Schematic
VIN
VIN
PGOOD
BOOTA
SYNC
SS/FSEL
EN
SCAP
LA
SWA
ILIM
VGA
BOOTB
TON
VG+
VG-
LB
SWB
FB
AGND
PGND
VOUT
Copyright © 2016, Texas Instruments Incorporated
2 Applications
• Telecom, base station, and communications
equipment
• Storage, SSD, DDR memory, switches, hubs,
routers, and other networking equipment
• Low profile/Backside board mounting (< 2 mm
height)
3 Description
The TPS54A20 is a two-phase, synchronous series
capacitor buck converter designed for small size, low
voltage applications from a 12-V input rail. This
topology uniquely merges a switched capacitor circuit
with a two phase buck converter. Advantages include
automatic current balancing between the inductors,
lower switching losses which enable high frequency
(HF) operation, and voltage step-down through the
series capacitor. Small, low profile inductors used
with the TPS54A20 significantly reduce total solution
area and height. An adaptive on-time control
architecture provides fast transient response and
accurate voltage regulation at up to 10-MHz operating
frequency. Fixed frequency operation during steady
state is maintained through the use of a phase lock
loop (PLL) to lock switching signals to a reference
oscillator.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
TPS54A20
VQFN (20 pins)
3.5 mm x 4 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
Efficiency vs Load Current
95
90
85
80
75
70
65
9 V_IN
60
12 V_IN
14 V_IN
55
0
2
4
6
8
10
Output Current (A)
D019
1.8 V_OUT, 2 MHz per phase, External VG+,
3.2 x 2.5 x 1.2 mm inductors
1
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.