TPS51727
www.ti.com .............................................................................................................................................................. SLUS806A–APRIL 2008–REVISED MAY 2008
DUAL-PHASE, ECO-MODE™ STEP-DOWN POWER MANAGEMENT IC FOR 50-A+
APPLICATIONS
1
FEATURES
DESCRIPTION
2
•
Seamless Phase Add/Drop Enables Maximum
Efficiency Under Any Load Condition
The TPS51727 is a complete, step down controller
with integrated gate drivers. The PCNT pin enables
operation in dual or single-phase mode to optimize
efficiency depending on the load requirements. The
advanced D-CAP+™ architecture provides fast
transient response with minimum output capacitance.
The DAC supports VID-on-the-fly transitions to
optimize the output voltage to the operating state of
the system to meet idle power requirements. The
auto-skip feature of the TPS51727 optimizes
light-load efficiency in both single and dual phase
operation. System management features include an
adjustable thermal sensor, output power monitoring
and sleep state controls. Adjustable control of VOUT
slew rate and voltage positioning are provided. In
addition, the TPS51727 includes two high-current
MOSFET gate drivers to drive high and low side
N-channel MOSFETs with exceptionally high speed
and low switching loss The PCNT and VID0 through
VID4, pins have flexible LV I/O thresholds that enable
interface with logic voltages from 1.0 V to 3.6 V. The
TPS51727 is packaged in a space saving, thermally
enhanced, RoHS compliant 40-pin QFN and is rated
to operate from –10°C to 100°C.
•
•
•
Minimum External Parts Count
±8 mV VOUT Accuracy Over Line/Load/Temp.
5-Bit DAC with 0.4-V to 1.25-V Output Range
Supports Wide Range of Applications
•
•
Optimized Efficiency at Light & Heavy Loads
Patent Pending Output Overshoot Reduction
(OSR™)
•
•
•
•
Accurate, Adjustable Voltage Positioning
Selectable 200/300/400/500 kHz Frequency
Pat. pending AutoBalance™ Phase Balancing
Supports Resistor or Inductor DCR Current
Sensing
•
•
•
•
Accurate, Selectable Current Limit
4.5-V to 28-V Conversion Voltage Range
Fast MOSFET Driver w/Integrated Boost Diode
Integrated OVP Can Be Disabled Thermal
Sensor and Output Power Monitor
•
Small 6 × 6, 40-Pin QFN PowerPAD™ Package
APPLICATIONS
•
High-Current, Low-Voltage Applications for
Adapter, Battery, NVDC or 5-V/12-V Rails
R1
VREF
V5
VBAT
CSP1
CSN1
Time Constant
and
Thermal Matching
V5
C1
1 mF
VREF
40 39 38 37 36 35 34 33 32 31
C6
R5
C
IN
L1
0.36 mH
V
Q1
OUT
1
2
DROOP
DRVH1 30
VBST 29
LL1 28
C8
C4
VREF
GND
3
+
Q2
4
CSP1
CSN1
CSN2
CSP2
DRVL1 27
V5IN 26
CSP1
CSN1
CSN2
CSP2
V
C
OUT
OUT
TPS51727
RHA
5
6
PGND 25
DRVL2 24
LL2 23
PGND
7
R6
L2
0.36 mH
Q4
GFB
VFB
8
GFB
VFB
C10
9
VBST2 22
DRVH2 21
R
1 mF
T2
R7
THRM
10
CSP2
Time Constant
and
Thermal Matching
Q3
C11
1 mF
CSN2
11 12 13 14 15 16 17 18 19 20
VBAT
UDG-08003
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.
2
ECO-MODE, OSR, AutoBalance, PowerPAD, D-CAP+, D-CAP+ are trademarks of Texas Instruments.
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 © 2008, Texas Instruments Incorporated