TPS53511 Datasheet, PDF (1/21 Pages) Texas Instruments – 4.5-V to 18-V Input, 1.5-A Step-Down Regulator with Integrated Switcher

TPS53511
www.ti.com
SLUSBG4 – MARCH 2013
4.5-V to 18-V Input, 1.5-A Step-Down Regulator with Integrated Switcher
Check for Samples: TPS53511
FEATURES
1
•2 Continuous 1.5-A Output Current
• 4.5-V to 18-V Supply Voltage Range
• 2-V to 18-V Conversion Voltage Range
• DCAP2™ Mode Control Enables Fast Transient
Response
• Low Output Ripple and Support all MLCC
Output Capacitor
• Skip Mode for Light Load Control
• Highly Efficient Integrated FETs Optimized for
Lower Duty Cycle Applications
• High Efficiency, Less than 10-µA Supply
Current at Shutdown
• Adjustable Soft-Start Time
• Support Pre-Biased Soft Start
• 700-kHz Switching Frequency
• Cycle-By-Cycle Overcurrent Limit
• Open Drain Power Good Indication
• Internal Bootstrap Switch
• Small 3 mm × 3 mm, 16-Pin QFN (RGT)
Package
APPLICATIONS
• Points-of-Load for Server
• Distributed Non-Isolated DC-DC Converters for
Computing Power System
DESCRIPTION
The TPS53511 is an adaptive on-time D-CAP2™
mode synchronous buck converter. The device is
suitable for points-of-load (POL) in computing power
systems, and provides a cost-effective, low
component count, low standby current solution. The
main control loop for the TPS53511 uses the D-
CAP2™ mode control providing a fast transient
response with no external components. The adaptive
on-time control supports seamless operation between
PWM mode during heavy load conditions and
reduced frequency operation during light load
conditions for high efficiency.
The TPS53511 includes a proprietary circuit that
enables the device to adapt to both low equivalent
series resistance (ESR) output capacitors, such as
POSCAP or SP-CAP, and ultra-low ESR ceramic
capacitors. The device operates from 4.5-V to 18-V
supply input, and from 2-V to 18-V input power supply
voltage. The device features an adjustable slow start
time and a power good function. It also supports pre-
biased soft start. The TPS53511 is available in the
16-pin QFN package, and designed to operate from
–40°C to 85°C.
TYPICAL APPLICATION
+
V_IN
–
SGND PGND
Output Signal
Input Signal
16
15
14
VO VCC VIN
1 VFB
13
VIN
VBST 12
2 VREG5
3 SS
TPS53511
SW 11
SW 10
4 GND
PG
5
SW ⁹
EN PGND PGND
6
7
8
+
V_OUT
–
UDG-13043
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
DCAP2, PowerPAD are trademarks of Texas Instruments.
2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2013, Texas Instruments Incorporated