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Texas Instruments
Texas Instruments

TPS51124 Datasheet

DUAL SYNCHRONOUS STEP-DOWN CONTROLLER


TPS51124 Datasheet Preview


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TPS51124
www.ti.com
SLVS616A – NOVEMBER 2005 – REVISED NOVEMBER 2005
DUAL SYNCHRONOUS STEP-DOWN CONTROLLER FOR
LOW VOLTAGE POWER RAILS
FEATURES
High Efficiency, Low-Power Consumption,
Shutdowns to <1 µA
Fixed Frequency Emulated On-Time Control,
Frequency Selectable From Three Options
D-CAP™ Mode Enables Fast Transient
Response
Auto-Skip Mode
Less Than 1% Initial Reference Accuracy
Low Output Ripple
Wide Input Voltage Range: 3 V to 28 V
Output Voltage Range: 0.76 V to 5.5 V
Low-Side RDS(ON) Loss-less Current Sensing
Adaptive Gate Drivers With Integrated Boost
Diode
Internal 1.2-ms Voltage-Servo Soft Start
Power-Good Signals for Each Channel With
Delay Timer
Output Discharge During Disable, Fault
APPLICATIONS
Notebook I/O and Low Voltage System Bus
DESCRIPTION
The TPS51124 is a dual, adaptive on-time D-CAP™
mode synchronous buck controller. The part enables
system designers to cost effectively complete the
suite of notebook power bus regulators with the
absolute lowest external component count and lowest
standby consumption. The fixed frequency emulated
adaptive on-time control supports seamless operation
between PWM mode at heavy load condition and
reduced frequency operation at light load for high
efficiency down to milliampere range. The main
control loop for the TPS51124 uses the D-CAP mode
that optimized for low ESR output capacitors such as
POSCAP or SP-CAP promises fast transient
response with no external compensation. Simple and
separate power good signals for each channel allow
flexibility of power sequencing. The part provides a
convenient and efficient operation with supply input
voltages (V5IN, V5FILT) ranging from 4.5 V to 5.5 V,
conversion voltages (drain voltage for the
synchronous high-side MOSFET) from 3 V to 28 V
and output voltages from 0.76 V to 5.5 V.
The TPS51124 is available in 24-pin QFN package
specified from –40°C to 85°C ambient temperature
range.
Input Voltage
3 V to 28 V
C9
22 µF
R5
R4 75 kSGND
73.2 k
R2
75
k
R1
28.7 k
VO2
1.5 V/10 A
SGND PGND
Power
Good2
C6
10 µF
Q3
IRF7821
L2
1 µH
EN2
C5
0.1 µF
654321
7 PGOOD2
8 EN2
9 VBST2
10 DRVH2
PGOOD1 24
TM
PowerPAD
EN1 23
Power
Good1
EN1
TPS51124RGE
(QFN24)
VBST1 22
C2
0.1 µF
DRVH1 21
Q1
IRF7821
C4
2 x 330 µF
V5IN
4.5 V to 5.5 V
Q4
IRF8113
11 LL2
12 DRVL2
LL1 20
DRVL1 19
Q2
IRF8113
PGND
13 14
R6
6.8 k
15 16 17
R7 R3
3.3Ω 6.8
k
18
C7
4.7 μF
C8
1 μF
PGND
PGND
SGND
C3
L1 10 µF
1 µH
VO1
1.05 V/10 A
C1
2 x 330 µF
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.
D-CAP, PowerPAD 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 © 2005, Texas Instruments Incorporated
Page 1

TPS51124
SLVS616A – NOVEMBER 2005 – REVISED NOVEMBER 2005
www.ti.com
These devices have limited built-in ESD protection. The leads should be shorted together or the device
placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates.
ORDERING INFORMATION(1)
TA
–40°C to 85°C
PACKAGE
Plastic Quad
Flat Pack (QFN)
ORDERING
PART
NUMBER
TPS51124RGET
TPS51124RGER
PINS
24
OUTPUT
SUPPLY
Tape-and-Reel
Tape-and-Reel
(1) All packaging options have Cu NIPDAU lead/ball finish.
MINIMUM
ORDER
QUANTITY
250
3000
ECO PLAN
Green (RoHS and
no Sb/Br)
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ABSOLUTE MAXIMUM RATINGS(1)
over operating free-air temperature range (unless otherwise noted)
Input voltage
range
VBST1, VBST2
VBST1, VBST2 (wrt LLx)
V5IN, V5FILT, EN1, EN2, VFB1, VFB2, TRIP1, TRIP2, VO1, VO2, TONSEL
DRVH1, DRVH2
Output voltage
range
DRVH1, DRVH2 (wrt LLx)
LL1, LL2
PGOOD1, PGOOD2, DRVL1, DRVL2
PGND1, PGND2
TA Operating ambient temperature range
Tstg Storage temperature range
TJ Junction temperature range
VALUE
–0.3 to 36
–0.3 to 6
–0.3 to 6
–1 to 36
–0.3 to 6
–2 to 30
–0.3 to 6
–0.3 to 0.3
–40 to 85
–55 to 150
–40 to 125
UNIT
V
V
°C
°C
°C
(1) Stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. These are stress ratings
only and functional operation of the device at these or any other conditions beyond those indicated under recommended operating
conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. All voltage
values are with respect to the network ground terminal unless otherwise noted
DISSIPATION RATINGS
PACKAGE
24-pin QFN(1)
TA <25°C
POWER RATING
2.33 W
DERATING FACTOR
ABOVE TA = 25°C
23.3 mW/°C
(1) Enhanced thermal conductance by 2 × 2 thermal vias beneath thermal pad.
TA = 85°C
POWER RATING
0.93 W
RECOMMENDED OPERATING CONDITIONS
over operating free-air temperature range (unless otherwise noted)
Supply input voltage range
V5IN, V5FILT
VBST1, VBST2
Input voltage range
VBST1, VBST2 (wrt LLx)
EN1, EN2, VFB1, VFB2, TRIP1, TRIP2, VO1, VO2, TONSEL
DRVH1, DRVH2
DRVH1, DRVH2 (wrt LLx)
Output voltage range
LL1, LL2
PGOOD1, PGOOD2, DRVL1, DRVL2
PGND1, PGND2
TA Operating ambient temperature range
MIN MAX UNIT
4.5 5.5 V
–0.1 34
–0.1 5.5 V
–0.1 5.5
–0.8 34
–0.1 5.5
–1.8 28 V
–0.1 5.5
–0.1 0.1
–40 85 °C
2
Page 2

TPS51124
www.ti.com
SLVS616A – NOVEMBER 2005 – REVISED NOVEMBER 2005
ELECTRICAL CHARACTERISTICS
over operating free-air temperature range, V5IN = V5FILT = 5 V (unless otherwise noted)
PARAMETER
TEST CONDITIONS
SUPPLY CURRENT
IV5FILT
V5FILT supply current
V5FILT current, no load,
EN1 = EN2 = 5 V, VFB1 = VFB2 = 0.77 V,
LL1=LL2=0.5V
IV5INSDN V5IN shutdown current
V5IN current, no load, EN1 = EN2 = 0 V
IV5FILTSD V5FILT shutdown current V5FILT current, no load, EN1 = EN2 = 0 V
N
VFB VOLTAGE and DISCHARGE RESISTANCE
VVFB
VVFB
VFB regulation voltage
VFB regulation voltage
tolerance
VVFBSKIP
VFB regulation shift in
continuous conduction
FB voltage, skip mode (fPWM/10)
TA = 25°C, bandgap initial accuracy
TA = 0°C to 85°C(1)
TA = –40°C to 85°C(1)
0.758-V target for resistor divider. See PWM Operation of
Detailed Description(1)
IVFB VFB input current
VFBx = 0.758 V, absolute value
RDischg VO discharge resistance ENx = 0 V, VOx = 0.5 V, TA = 25°C
OUTPUT: N-CHANEEL MOSFET GATE DRIVERS
RDRVH DRVH resistance
RDRVL DRVL resistance
TD Dead time
Source, VVBSTx–DRVHx = 0.5 V
Sink, VDRVHx-LLx= 0.5 V
Source, VV5IN–DRVLx = 0.5 V
Sink, VDRVLx–PGNDx = 0.5 V
DRVHx-low (DRVHx = 1 V) to DRVLx-on
(DRVLx = 4 V), LL = –0.05 V,
DRVLx-low (DRVLx = 1 V) to DRVHx-on
(DRVHx = 4 V), LL = –0.05 V,
INTERNAL BST DIODE
VFBST
Forward voltage
VV5IN–VBSTx, IF = 10 mA, TA = 25°C
IVBSTLK VBST leakage current
VBST = 34 V, LL = 28 V, VOx = 5.5 V,
TA = 25°C
ON-TIME TIMER CONTROL AND INTERNAL SOFT START,
TON11
TON12
TON13
TON21
TON22
TON23
TON(MIN)
TOFF(MIN)
CH1, 240-kHz setting
CH1, 300-kHz setting
CH1, 360-kHz setting
CH2, 300-kHz setting
CH2, 360-kHz setting
CH2, 420-kHz setting
CH2 On time
CH1/CH2 Min. off time
Tss Internal SS time
VO1 = 1.5 V,TONSEL = GND, LL1 = 12 V
VO1 = 1.5 V, TONSEL = FLOAT, LL1 = 12 V
VO1 = 1.5 V,TONSEL = V5FILT, LL1 = 12 V
VO2 = 1.05 V, TONSEL = GND, LL2 = 12 V
VO2 = 1.05 V, TONSEL = FLOAT, LL2 = 12 V
VO2 = 1.05 V, TONSEL = V5FILT, LL2 = 12 V
VO2 = 0.76 V, TONSEL = V5FILT, LL2 = 28 V
LL = –0.1 V, TA= 25°C, VFB = 0.7 V
Internal soft start, time from ENx > 3 V to VFBx regulation value
= 735 mV
MIN
–0.9%
–1.3%
–1.6%
10
30
0.7
440
340
265
235
180
120
80
0.85
TYP
350
764
758
0.02
10
5
1.5
4
1
20
40
0.8
0.1
500
390
305
270
210
150
110
435
1.2
MAX UNIT
700 µA
1 µA
1 µA
0.9%
1.3%
1.6%
mV
mV
0.1 µA
20
7
2.5
6
2.0
50 ns
60 ns
0.9 V
1 µA
560 ns
440 ns
345 ns
305 ns
240 ns
180 ns
140 ns
ns
1.40 ms
(1) Ensured by design. Not production tested.
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TPS51124
SLVS616A – NOVEMBER 2005 – REVISED NOVEMBER 2005
ELECTRICAL CHARACTERISTICS (Continued)
over operating free-air temperature range, V5IN = V5FILT = 5 V (unless otherwise noted)
PARAMETER
UVLO/LOGIC THRESHOLD
VUV5VFILT V5FILT UVLO threshold
VEN ENx threshold
IEN ENx input current
VTONSEL TONSEL threshold
TEST CONDITIONS
Wake up
Hysteresis
Wake up
Hysteresis
Absolute value(1)
Fast (1)
Medium (1)
MIN
3.7
0.2
1.0
V5FILT
–0.3
2
Slow (1)
ITONSEL
TONSEL input current
TONSEL=0V, current out of the pin(1)
TONSEL=5V, current in to the pin(1)
CURRENT SENSE
ITRIP
TCITRIP
VOCLoff
VZC
TRIP source current
ITRIP temperature coeffficent
OCP compensation offset
Zero cross detection comparator
offset
VTRIPx < 0.3 V, TA = 25°C
On the basis of 25°C(1)
(VTRIPx-GND– VPGNDx-LLx) voltage,
VTRIPx-GND = 60 mV
VPGNDx-LLx voltage, PGOODx = Hi(1)
VRtrip
Current limit threshold setting
range
VTRIPx-GND voltage, all temperatures(1)
POWER-GOOD COMPARATOR
PG in from lower (PGOODx goes hi)
VTHPG
PG threshold
PG low hysteresis (PGOODx goes low)
PG in from higher (PGOODx goes hi)
PG high hysteresis (PGOODx goes low)
IPGMAX
PG sink current
PGOODx = 0.5 V
TPGDEL
PG delay
Delay for PG in
OUTPUT UNDERVOLTAGE AND OVERVOLTAGE PROTECTION
VOVP
TOVPDEL
VUVP
Output OVP trip threshold
Output OVP prop delay
Output UVP trip threshold
OVP detect
UVP detect
Hysteresis (recovery < 20 µs)
TUVPDEL Output UVP delay
TUVPEN
Output UVP enable delay
THERMAL SHUTDOWN
After 1.7 × Tss, UVP protection engaged
TSDN
Thermal shutdown threshold
Shutdown temperature(1)
Hysteresis (1)
9
–10
30
92.5%
102.5%
2.5
400
110%
65%
20
1.4
TYP
4.0
0.3
1.3
0.2
0.02
1
1
10
4200
0
0.5
95%
–5%
105%
5%
5.0
510
115%
1.5
70%
10%
32
2
160
10
www.ti.com
MAX UNIT
4.3
0.4
1.5
0.1
V5FILT
–1.0
0.5
V
V
V
V
µA
V
V
V
µA
µA
11 µA
ppm/°C
10 mV
mV
200 mV
97.5%
107.5%
mA
620 µs
120%
75%
µs
40 µs
2.4 ms
°C
(1) Ensured by design. Not production tested.
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4
Page 4
Part Number TPS51124
Manufactur Texas Instruments
Description DUAL SYNCHRONOUS STEP-DOWN CONTROLLER
Total Page 22 Pages
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