Texas Instruments TPS51123ARGER Schematic [ru]

TPS51123A

www.ti.com

SLUSAA6C –APRIL 2011–REVISED SEPTEMBER 2012

Dual-Synchronous, Step-Down Controller with Out-of-Audio™ Operation and 100-mA

LDOs for Notebook System Power

Check for Samples: TPS51123A

1

FEATURES

2

• Wide-Input Voltage Range: 5.5 V to 28 V

• Output Voltage Range: 2 V to 5.5 V • I/O Supplies

• Built-in 100-mA 5-V/3.3-V LDO with Switches • System Power Supplies

• Built-in 1% 2-V Reference Output

• With/Without Out-of-Audio™ Mode Selectable
Light-Load and PWM-Only Operation

• Internal 1.6-ms Voltage Servo Soft-Start

• Adaptive On-Time Control Architecture with
Four Selectable Frequency Setting

• 4500 ppm/°C R

• Built-In Output Discharge

• Power Good Output

• Built-in OVP/UVP/OCP

• Thermal Shutdown (Non-latch)

• 24-Pin QFN (RGE) Package

Current Sensing

DS(on)

APPLICATIONS

• Notebook Computers

DESCRIPTION

The TPS51123A is a cost effective, dual-synchronous
buck controller targeted for notebook system power
supply solutions. It provides 5-V and 3.3-V LDOs and
requires few external components. The TPS51123A
supports high-efficiency, fast transient responses and
provides a combined power-good signal. Out-of­Audio™ mode light-load operation enables low
acoustic noise at much higher efficiency than
conventional forced PWM operation. Adaptive on­time D-CAP™ control provides convenient and
efficient operation. The part operates with supply
input voltages ranging from 5.5 V to 28 V and
supports output voltages from 2 V to 5.5 V. The
TPS51123A is available in a 24-pin QFN package
and is specified from -40°C to 85°C ambient
temperature range.

Table 1. Differences Between the TPS51123 and TPS51123A

LDO Output Capacitance Requirement

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.

2Out-of-Audio, 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.

(1 µF acceptable at no load) (1 µF acceptable at no load)

TPS51123 TPS51123A

VREG5: at least 33 µF VREG5: 10 µF or larger (X5R or X7R)
VREG3: at most 10 µF VREG3: 10 µF or larger (X5R or X7R)

VREF: 0.22 µF to 1 µF VREF: 0.22 µF to 1 µF (X5R or X7R)

Copyright © 2011–2012, Texas Instruments Incorporated

7

8

9

10

24

23

22

21

VO1

PGOOD

VBST1

DRVH1

VO2

VREG3

VBST2

DRVH2

TPS51123ARGE

(QFN-24)

11

12

20

19

LL1

DRVL1

LL2

DRVL2

13 14 15 16 17 18

EN0

SKIPSEL

GND

VIN

VREG5

ENC

6 5 4 3 2 1

TRIP2

VFB2

TONSEL

VREF

VFB1

TRIP1

PowerPAD

220 nF

20 kW 20 kW 30 kW

100 kW

VREG5

10 mF

5.1 W

0.1 mF

130 kW130 kW

3.3 mF

330 mF

VO1

5 V

VIN

VREG5

ENC

VIN

10 mF x 2

VIN

5.5 V
to

28 V

EN0

5.1 W

0.1 mF

3.3 mF

330 mF

VO2

3.3 V

10 mF x 2

10 mF

13 kW

UDG-10086

VIN

TPS51123A

SLUSAA6C –APRIL 2011–REVISED SEPTEMBER 2012

This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with
appropriate precautions. Failure to observe proper handling and installation procedures can cause damage.

ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more
susceptible to damage because very small parametric changes could cause the device not to meet its published specifications.

www.ti.com

2 Submit Documentation Feedback Copyright © 2011–2012, Texas Instruments Incorporated

Product Folder Links: TPS51123A

TPS51123A

www.ti.com

ORDERING INFORMATION

T

A

-40°C to 85°C 24

PACKAGE PINS ECO PLAN

Plastic Quad Flat Pack Green (RoHS and

(QFN) no Sb/Br)

ORDERABLE OUTPUT MINIMUM

DEVICE SUPPLY QUANTITY

TPS51123ARGER Tape/Reel 3000
TPS51123ARGET Small Tape/Reel 250

SLUSAA6C –APRIL 2011–REVISED SEPTEMBER 2012

(1)

(1) For the most current spcifications and package information, see the Package Option Addendum located at the end of this data sheet or

refer to our web site at http://www.ti.com.

ABSOLUTE MAXIMUM RATINGS

(1)

over operating free-air temperature range (unless otherwise noted)

PARAMETER UNIT

VBST1, VBST2 –0.3 36
VIN –0.3 30
LL1, LL2 –2.0 30
LL1, LL2, pulse width < 20 ns –5.0 30
VBST1, VBST2

(2)

Input voltage range

(1)

EN0, ENC, TRIP1, TRIP2, VFB1, VFB2, VO1, VO2, TONSEL,
SKIPSEL

DRVH1, DRVH2 –1.0 36

Output voltage range

(1)

DRVH1, DRVH2

(2)

PGOOD, VREG3, VREG5, VREF, DRVL1, DRVL2 –0.3 6

Electrostatic discharge

Junction temperature range, T
Storage temperature, T

Human body model QSS 009-105 (JESD22-A114A) 2 kV
Charged device model QSS 009-147 (JESD22-C101B.01) 1.5 kV

J

stg

(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.

(2) Voltage values are with respect to the corresponding LLx terminal.

VALUE

MIN MAX

V

–0.3 6
–0.3 6

–0.3 6 V

–40 125 °C
–55 150 °C

DISSIPATION RATINGS

2-oz. trace and copper pad with solder.

PACKAGE TA< 25°C POWER RATING TA= 85°C POWER RATING

24-pin RGE

(1)

1.85 W 18.5 mW/°C 0.74 W

DERATING FACTOR ABOVE T

= 25°C

(1) Enhanced thermal conductance by 3 x 3 thermal vias beneath thermal pad.

Copyright © 2011–2012, Texas Instruments Incorporated Submit Documentation Feedback 3

Product Folder Links: TPS51123A

A

TPS51123A

SLUSAA6C –APRIL 2011–REVISED SEPTEMBER 2012

RECOMMENDED OPERATING CONDITIONS

over operating free-air temperature range (unless otherwise noted)

PARAMETER MIN TYP MAX UNIT

Supply voltage VIN 5.5 28

VBST1, VBST2 -0.1 34

Input voltage range

Output voltage range LL1, LL2 -1.8 28

T

A

VBST1, VBST2 (wrt LLx) -0.1 5.5
EN0, ENC, TRIP1, TRIP2, VFB1, VFB2, VO1, VO2,

TONSEL, SKIPSEL
DRVH1, DRVH2 -0.8 34
DRVH1, DRVH2 (wrt LLx) -0.1 5.5

VREF, VREG3, VREG5 -0.1 5.5
PGOOD, DRVL1, DRVL2 -0.1 5.5
Operating free-air temperature -40 85 °C

-0.1 5.5

www.ti.com

V

4 Submit Documentation Feedback Copyright © 2011–2012, Texas Instruments Incorporated

Product Folder Links: TPS51123A

TPS51123A

www.ti.com

ELECTRICAL CHARACTERISTICS

over operating free-air temperature range, VIN = 12 V (unless otherwise noted)

PARAMETER CONDITIONS MIN TYP MAX UNIT

SUPPLY CURRENT

I

VIN1

I

VIN2

I

VO1

I

VO2

I

VINSTBY

I

VINSDN

VIN supply current1 VO2 = 0 V, EN0=open, ENC = 5 V, 0.55 1.00 mA

VIN supply current2 VO2 = 3.3 V, EN0=open, ENC = 5 V, 4.0 6.5 μA

VO1 current VO2 = 3.3 V, EN0=open, ENC = 5 V, 0.8 1.5 mA

VO2 current VO2 = 3.3 V, EN0=open, ENC = 5 V, 12 100

VIN standby current 95 150

VIN shutdown current 10 25

VREF OUTPUT

V

VREF

VREF output voltage V

VREG5 OUTPUT

V

VREG5

I

VREG5

V

TH5VSW

R

5VSW

VREG5 output voltage 4.75 5 5.25 V

VREG5 output current VO1 = 0 V, VREG5 = 4.5 V 100 175 250 mA

Switch over threshold V

5 V SW R

ON

VREG3 OUTPUT

V

VREG3

I

VREG3

V

TH3VSW

R

3VSW

VREG3 output voltage VO2 = 0 V, I

VREG3 output current VO2 = 0 V, VREG3 = 3 V 100 175 250 mA

Switch over threshold V

3 V SW R

ON

INTERNAL REFERENCE VOLTAGE

V

IREF

V

VFB

I

VFB

OUTPUT VOLTAGE, V

I

Dischg

Internal reference voltage I

VFB regulation voltage

VFB input current VFBx = 2.0 V, TA= 25°C -20 20 nA

DISCHARGE

OUT

V

discharge current ENC = 0 V, VOx = 0.5 V 10 60 mA

OUT

(1) Ensured by design. Not production tested.

VIN current, TA= 25°C, no load, VO1 = 0 V,
TRIP1 = TRIP2 = 2 V, VFB1 = VFB2 = 2.05 V

VIN current, TA= 25°C, no load, VO1 = 5 V,
TRIP1 = TRIP2 = 2 V, VFB1 = VFB2 = 2.05 V

VO1 current, TA= 25°C, no load, VO1 = 5 V,
TRIP1 = TRIP2 = 2 V, VFB1 = VFB2 = 2.05 V

VO2 current, TA= 25°C, no load, VO1 = 5 V,
TRIP1 = TRIP2 = 2 V, VFB1 = VFB2 = 2.05 V

VIN current, TA= 25°C, no load, μA
EN0 = 1.2 V, ENC = 0 V

VIN current, TA= 25°C, no load,
EN0 = ENC = 0 V

I

= 0 A 1.98 2.00 2.02

VREF

–5 μA < I

VO1 = 0 V, I
VO1 = 0 V, I

6.5 V < VIN < 28 V
VO1 = 0 V, I

< 100 μA 1.97 2.00 2.03

VREF

< 100 mA, TA= 25°C 4.8 5 5.2

VREG5

< 100 mA,

VREG5

< 50 mA, 5.5 V < VIN < 28 V 4. 75 5 5.25

VREG5

Turns on 4.55 4.7 4.85
Hysteresis 0.15 0.25 0.3
VO1 = 5 V, I

VO2 = 0 V, I

VO2 = 0 V, I

= 100 mA 1 3 Ω

VREG5

< 100 mA, TA= 25°C 3.2 3.33 3.46

VREG3

< 100 mA, 6.5 V < VIN < 28 V 3.13 3.33 3.5 V

VREG3

< 50 mA, 5.5 V < VIN < 28 V 3.13 3.33 3.5

VREG3

Turns on 3.05 3.15 3.25
Hysteresis 0.1 0.2 0.25
VO2 = 3.3 V, I

= 0 A, beginning of ON state 1.95 1.98 2.01

VREF

FB voltage, I
FB voltage, I
FB voltage, I

(1)

mode

= 100 mA 1.5 4 Ω

VREG3

= 0 A, skip mode 1.98 2.01 2.04

VREF

= 0 A, OOA mode

VREF

= 0 A, continuous conduction

VREF

(1)

SLUSAA6C –APRIL 2011–REVISED SEPTEMBER 2012

2.00 2.035 2.07

V

2.00

Copyright © 2011–2012, Texas Instruments Incorporated Submit Documentation Feedback 5

Product Folder Links: TPS51123A

TPS51123A

SLUSAA6C –APRIL 2011–REVISED SEPTEMBER 2012

ELECTRICAL CHARACTERISTICS (continued)

over operating free-air temperature range, VIN = 12 V (unless otherwise noted)

PARAMETER CONDITIONS MIN TYP MAX UNIT

OUTPUT DRIVERS

R

DRVH

R

DRVL

t

DEAD

DRVH resistance

DRVL resistance

Dead time ns

Source, V
Sink, V
Source, V
Sink, V
DRVHx-off to DRVLx-on 10
DRVLx-off to DRVHx-on 30

INTERNAL BST DIODE

V

FBST

I

VBSTLK

Forward voltage V

VREG5-VBSTx

VBST leakage current VBSTx = 34 V, LLx = 28 V, TA= 25 °C 0.1 1 μA

DUTY AND FREQUENCY CONTROL

t

ON11

t

ON12

t

ON13

t

ON14

t

ON21

t

ON22

t

ON23

t

ON24

t

ON(min)

t

OFF(min)

CH1 on time 1 VIN= 12 V, VO1 = 5 V, 200 kHz setting 2080
CH1 on time 2 VIN= 12 V, VO1 = 5 V, 245 kHz setting 1700
CH1 on time 3 VIN= 12 V, VO1 = 5 V, 300 kHz setting 1390
CH1 on time 4 VIN= 12 V, VO1 = 5 V, 365 kHz setting 1140
CH2 on time 1 VIN= 12 V, VO2 = 3.3 V, 250 kHz setting 1100
CH2 on time 2 VIN= 12 V, VO2 = 3.3 V, 305 kHz setting 900
CH2 on time 3 VIN= 12 V, VO2 = 3.3 V, 375 kHz setting 730
CH2 on time 4 VIN= 12 V, VO2 = 3.3 V, 460 kHz setting 600
Minimum on time TA= 25 °C 80
Minimum off time TA= 25 °C 300

SOFT-START

t

SS

Internal SS time Internal soft start 1.1 1.6 2.1 ms

POWERGOOD

PG in from lower 92.50% 95% 97.50%

V

THPG

PG threshold PG in from higher 102.50% 105% 107.50%

PG hysteresis 2.50% 5% 7.50%

I

PGMAX

t

PGDEL

PG sink current PGOOD = 0.5 V 5 12 mA
PG delay Delay for PG in 350 510 670 μs

LOGIC THRESHOLD AND SETTING CONDITIONS

V

EN0

I

EN0

V

ENC

V

EN(trip)

EN0 setting voltage V

EN0 current V

ENC threshold voltage V

TRIP1, TRIP2 threshold mV

Shutdown 0.4
Enable 2.4

= 0.2 V 2 3.5 5 μA

EN0

Shutdown 0.6
Enable 2
Shutdown 350 400 450
Hysteresis 10 30 60
200 kHz/250 kHz 1.5

V

TONSEL

TONSEL setting voltage V

245 kHz/305 kHz 1.9 2.1
300 kHz/375 kHz 2.7 3.6
365 kHz/460 kHz 4.7
Auto skip 1.5

V

SKIPSEL

SKIPSEL setting voltage PWM only 1.9 2.1 V

OOA auto skip 2.7

BSTx - DRVHx

DRVHx - LLx

VREG5 - DRVLx

= 100 mV 1.5 4

DRVLx

, IF= 10 mA, TA= 25 °C 0.7 0.8 0.9 V

= 100 mV 4 8

= 100 mV 1.5 4

= 100 mV 4 8

www.ti.com

Ω

ns

6 Submit Documentation Feedback Copyright © 2011–2012, Texas Instruments Incorporated

Product Folder Links: TPS51123A

TPS51123A

www.ti.com

ELECTRICAL CHARACTERISTICS (continued)

over operating free-air temperature range, VIN = 12 V (unless otherwise noted)

PARAMETER CONDITIONS MIN TYP MAX UNIT

PROTECTION: CURRENT SENSE

I

TRIP

TC

ITRIP

V

OCLoff

V

OCL(max)

V

ZC

V

TRIP

PROTECTION: UNDERVOLTAGE AND OVERVOLTAGE PROTECTION

V

OVP

t

OVPDEL

V

UVP

t

UVPDEL

t

UVPEN

UNDERVOLTAGE LOCKOUT (UVLO)

V

UVVREG5

V

UVVREG3

THERMAL SHUTDOWN

T

SDN

TRIPx source current V
TRIPx current temperature

coefficient
OCP comparator offset -8 0 8
Maximum OCL setting V

Zero cross detection
comparator offset

Current limit threshold V

= 920 mV, TA= 25°C 9.4 10 10.6 μA

TRIPx

On the basis of 25°C
((V

TRIPx-GND

GND

TRIPx

V

GND-LLx

TRIPx-GND

/9)-24 mV -V

= 920 mV

= 5 V 185 205 225 mV

voltage -5 0 5

voltage

(2)

) voltage, V

GND-LLx

(2)

OVP trip threshold OVP detect 110% 115% 120%
OVP prop delay 2 μs

Output UVP trip threshold

UVP detect 55% 60% 65%

Hysteresis 10%
Output UVP prop delay 20 32 40 μs
Output UVP enable delay 1.4 2 2.6 ms

VREG5 UVLO threshold

VREG3 UVLO threshold Shutdown

Thermal shutdown threshold °C

Wake up 4.1 4.2 4.3

Hysteresis 0.38 0.43 0.48 V

(2)

Shutdown temperature

Hysteresis

(2)

(2)

SLUSAA6C –APRIL 2011–REVISED SEPTEMBER 2012

4500 ppm/°C

TRIPx-

0.515 2 V

VO2-1

150

10

(2) Ensured by design. Not production tested.

Copyright © 2011–2012, Texas Instruments Incorporated Submit Documentation Feedback 7

Product Folder Links: TPS51123A

TPS51123A

SLUSAA6C –APRIL 2011–REVISED SEPTEMBER 2012

DEVICE INFORMATION

Table 2.

TERMINAL

NAME NO.

DRVH1 21
DRVH2 10
DRVL1 19
DRVL2 12

EN0 13 I/O Open : LDOs on, and ready to turn both switcher channels.

ENC 18 I
GND 15 – Ground.

LL1 20
LL2 11
PGOOD 23 O Powergood window comparator output for channel 1 and 2. (Logical AND)

SKIPSEL 14 I

TRIP1 1
TRIP2 6

TONSEL 4 I 300 kHz/375 kHz setting: connect to VREG3

VBST1 22
VBST2 9
VFB1 2
VFB2 5
VIN 16 I High voltage power supply input for 5-V/3.3-V LDO.
VO1 24
VO2 7

VREF 3 O

VREG3 8 O

VREG5 17 O

I/O DESCRIPTION

O High-side N-channel MOSFET driver outputs. LL referenced drivers.

O Low-side N-channel MOSFET driver outputs. GND referenced drivers.

Master enable input.
GND : disable all circuit

Channel 1 and Channel 2 enable input. Pull up to the voltage ranging 3.3-V to 5-V to turn on both
switcher channels. Short to ground to shutdown them.

I Switch node connections for high-side drivers, current limit and control circuitry.

Selection pin for operation mode:
OOA auto skip : Connect to VREG3 or VREG5
PWM only: Connect to VREF
Auto skip: Connect to GND

I/O

I/O

Channel 1 and Channel 2 enable and OCL trip setting pins. Connect resistor from this pin to GND to
set threshold for synchronous R

On-time adjustment pin.
365 kHz/460 kHz setting: connect to VREG5

245 kHz/305 kHz setting: connect to VREF
200 kHz/250 kHz setting: connect to GND

I Supply input for high-side N-channel MOSFET driver (boost terminal).

I SMPS feedback inputs. Connect with feedback resistor divider.

Output connection to SMPS. These terminals work as fixed voltage inputs and output discharge
inputs. VO1 and VO2 also work as 5-V and 3.3-V switch over return power input respectively.

2-V reference voltage output. Connect a high-quality X5R or X7R ceramic capacitor with a value
between 220-nF and 1-µF to signal GND near the device.

3.3-V power supply output. Connect a high-quality X5R or X7R ceramic capacitor with a value of 10­µF or larger to power GND near the device. A 1-μF ceramic capacitor is acceptable when not loaded.

5-V power supply output. Connect a high-quality X5R or X7R ceramic capacitor with a value of 10-µF
or larger to power GND near the device.

sense. Short to ground to shut down a switcher channel.

DS(on)

www.ti.com

8 Submit Documentation Feedback Copyright © 2011–2012, Texas Instruments Incorporated

Product Folder Links: TPS51123A

TPS51123ARGE

(QFN-24)

VO1

PGOOD

VO2

VREG3

VBST1

DRVL1

LL1

DRVH1

VBST2

DRVH2

LL2

DRVL2

EN0

TRIP2

VFB2

VREF

TONSEL

VFB1

TRIP1

SKIPSEL

GND

VIN

ENC

VREG5

2

3

4

5

6

7 8

9 10

11

1

12

13

14

15

16

17

18

24 23

22 21

20 19

TPS51123A

www.ti.com

SLUSAA6C –APRIL 2011–REVISED SEPTEMBER 2012

QFN PACKAGE (TOP VIEW)

Functional Block Diagram

Product Folder Links: TPS51123A

Copyright © 2011–2012, Texas Instruments Incorporated Submit Documentation Feedback 9

TPS51123A

SLUSAA6C –APRIL 2011–REVISED SEPTEMBER 2012

www.ti.com

Switcher Controller Block

10 Submit Documentation Feedback Copyright © 2011–2012, Texas Instruments Incorporated

Product Folder Links: TPS51123A

VIN SUPPLY CURRENT2

vs

JUNCTION TEMPERATURE

0

1

2

3

4

5

6

7

8

9

-50 0 50 100 150

TJ- Junction Temperature - °C

I

VIN2

- VIN Supply Current2 - mA

VIN SUPPLY CURRENT2

vs

INPUT VOLTAGE

0

1

2

3

4

5

6

7

8

9

5 10 15 20 25

VIN- Input Voltage - V

I

VIN2

- VIN Supply Current2 - mA

VIN SUPPLY CURRENT1

vs

INPUT VOLTAGE

0

100

200

300

400

500

600

700

800

5 10 15 20 25

VIN- Input Voltage - V

I

VIN1

- VIN Supply Current1 - mA

VIN SUPPLY CURRENT1

vs

JUNCTION TEMPERATURE

0

100

200

300

400

500

600

700

800

-50 0 50 100 150

TJ- Junction Temperature - °C

I

VIN1

- VIN Supply Current1 - m A

TPS51123A

www.ti.com

SLUSAA6C –APRIL 2011–REVISED SEPTEMBER 2012

TYPICAL CHARACTERISTICS

Copyright © 2011–2012, Texas Instruments Incorporated Submit Documentation Feedback 11

Figure 1. Figure 2.

Figure 3. Figure 4.

Product Folder Links: TPS51123A

VIN SHUTDOWN CURRENT

vs

INPUT VOLTAGE

0

5

10

15

20

25

5 10 15 20 25

VIN- Input Voltage - V

I

VINSDN

- VIN Shutdown Current - mA

VIN SHUTDOWN CURRENT

vs

JUNCTION TEMPERATURE

0

5

10

15

20

25

-50 0 50 100 150

TJ- Junction Temperature - °C

I

VINS DN

- VIN Shutdown Current - mA

VIN STANDBY CURRENT

vs

JUNCTION TEMPERATURE

0

50

100

150

200

250

-

50

0 50 100 150

TJ- Junction Temperature - °C

I

VINST BY

- VIN Standby Cu rrent - mA

0

50

100

150

200

250

I

VINSTBY

–VIN Standby Current – µA

5 10 15 20 25

VIN– Input Voltage – V

VIN STANDBY CURRENT

vs

INPUT VOLTAGE

.

TPS51123A

SLUSAA6C –APRIL 2011–REVISED SEPTEMBER 2012

TYPICAL CHARACTERISTICS (continued)

Figure 5. Figure 6.

www.ti.com

12 Submit Documentation Feedback Copyright © 2011–2012, Texas Instruments Incorporated

Figure 7. Figure 8.

Product Folder Links: TPS51123A