TPS51727 Datasheet, PDF (1/42 Pages) Texas Instruments – DUAL-PHASE, ECO-MODE™ STEP-DOWN POWER MANAGEMENT IC FOR 50-A+ APPLICATIONS

TPS51727
www.ti.com .............................................................................................................................................................. SLUS806A – APRIL 2008 – REVISED MAY 2008
DUAL-PHASE, ECO-MODE™ STEP-DOWN POWER MANAGEMENT IC FOR 50-A+
APPLICATIONS
FEATURES
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•2 Seamless Phase Add/Drop Enables Maximum
Efficiency Under Any Load Condition
• 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
DESCRIPTION
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.
VREF
C6
R5
C8
GFB
VFB
V_OUT
R6
CSP1
CSN1
CSN2
CSP2
R7
R_T2
R1
C1
1 mF
VREF
V5
V5
40 39 38 37 36 35 34 33 32 31
1 DROOP
2 VREF
3 GND
4 CSP1
5 CSN1
6 CSN2
7 CSP2
8 GFB
9 VFB
10 THRM
TPS51727
RHA
DRVH1 30
VBST 29
LL1 28
DRVL1 27
V5IN 26
PGND 25
DRVL2 24
LL2 23
VBST2 22
DRVH2 21
11 12 13 14 15 16 17 18 19 20
VBAT
Time Constant
and
Thermal Matching
CSP1
CSN1
Q1
C4
C_IN
L1
0.36 mH
V_OUT
Q2
+
C_OUT
PGND
C10
1 mF
C11
1 mF
Q4
L2
0.36 mH
Time Constant
Q3
and
Thermal Matching
CSP2
CSN2
VBAT
UDG-08003
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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.
ECO-MODE, OSR, AutoBalance, PowerPAD, D-CAP+, D-CAP+ are trademarks of Texas Instruments.
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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