Texas Instruments TPS51218DSCR Schematic [ru]

1

2

3

4

10

9

8

7

VBST

DRVH

SW

V5IN

PGOOD

TRIP

EN

VFB

TPS51218

5 6DRVLRF

GND

V

IN

V

OUT

V

OUT

_GND

EN

V5IN

UDG-09064

TPS51218

www.ti.com

SLUS935B –MAY 2009– REVISED FEBRUARY 2012

HIGH PERFORMANCE, SINGLE SYNCHRONOUS STEP-DOWN

CONTROLLER FOR NOTEBOOK POWER SUPPLY

Check for Samples: TPS51218

1

FEATURES

2

• Wide Input Voltage Range: 3 V to 28 V

• Output Voltage Range: 0.7 V to 2.6 V • I/O Supplies

• Wide Output Load Range: 0 to 20A+ • System Power Supplies

• Built-in 0.5% 0.7 V Reference

• D-CAP™ Mode with 100-ns Load Step

Response

• Adaptive On Time Control Architecture With 4
Selectable Frequency Setting

• 4700 ppm/°C R

• Internal 1-ms Voltage Servo Softstart

• Pre-Charged Start-up Capability

• Built in Output Discharge

• Power Good Output

• Integrated Boost Switch

• Built-in OVP/UVP/OCP

• Thermal Shutdown (Non-latch)

• SON-10 (DSC) Package

Current Sensing

DS(on)

APPLICATIONS

• Notebook Computers

DESCRIPTION

The TPS51218 is a small-sized single buck controller
with adaptive on-time D-CAP™ mode. The device is
suitable for low output voltage, high current, PC
system power rail and similar point-of-load (POL)
power supply in digital consumer products. A small
package with minimal pin-count saves space on the
PCB, while a dedicated EN pin and pre-set frequency
selections minimize design effort required for new
designs. The skip-mode at light load condition, strong
gate drivers and low-side FET R
supports low-loss and high efficiency, over a broad
load range. The conversion input voltage which is the
high-side FET drain voltage ranges from 3 V to 28 V
and the output voltage ranges from 0.7 V to 2.6 V.
The device requires an external 5-V supply. The
TPS51218 is available in a 10-pin SON package
specified from –40°C to 85°C.

current sensing

DS(on)

TYPICAL APPLICATION CIRCUIT

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.

2D-CAP is a trademark 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 © 2009–2012, Texas Instruments Incorporated

TPS51218

SLUS935B –MAY 2009– REVISED FEBRUARY 2012

www.ti.com

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.

ORDERING INFORMATION

T

A

PACKAGE PINS

–40°C to 85°C Plastic SON PowerPAD

ABSOLUTE MAXIMUM RATINGS

(1)

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

VBST –0.3 to 37

(3)

Input voltage range

Output voltage range

T

J

T

STG

(2)

(2)

(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) All voltage values are with respect to the network ground terminal unless otherwise noted.
(3) Voltage values are with respect to the SW terminal.

VBST
SW –5 to 30
V5IN, EN, TRIP, VFB, RF –0.3 to 7
DRVH –5 to 37

(3)

DRVH

(3)

DRVH

, pulse width < 20 ns –2.5 to 7
DRVL –0.5 to 7
DRVL, pulse width < 20 ns –2.5 to 7
PGOOD –0.3 to 7
Junction temperature range 150 °C
Storage temperature range –55 to 150 °C

ORDERING DEVICE OUTPUT MINIMUM

NUMBER SUPPLY QUANTITY

TPS51218DSCR 10 Tape and reel 3000
TPS51218DSCT 10 Mini reel 250

VALUE UNIT

–0.3 to 7

–0.3 to 7

V

V

DISSIPATION RATINGS

2-oz. trace and copper pad with solder.

PACKAGE TA< 25°C DERATING FACTOR TA= 85°C

10-pin DSC

(1)

(1) Enhanced thermal conductance by thermal vias is used beneath thermal pad as shown in Land Pattern information.

2 Submit Documentation Feedback Copyright © 2009–2012, Texas Instruments Incorporated

POWER RATING ABOVE TA= 25°C POWER RATING

1.54 W 15 mW/°C 0.62 W

Product Folder Link(s): TPS51218

TPS51218

www.ti.com

SLUS935B –MAY 2009– REVISED FEBRUARY 2012

RECOMMENDED OPERATING CONDITIONS

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

MIN TYP MAX UNIT

Supply voltage V5IN 4.5 6.5 V

VBST –0.1 34.5
SW –1 28

VBST

(1)

(2)

–4 28 V

–0.1 6.5

EN, TRIP, VFB, RF –0.1 6.5
DRVH –1 34.5

(1)

DRVH

(2)

–4 34.5

–0.1 6.5 V

DRVL –0.3 6.5
PGOOD –0.1 6.5
Operating free-air temperature –40 85 °C

Input voltage range SW

Output voltage range DRVH

T

A

(1) This voltage should be applied for less than 30% of the repetitive period.
(2) Voltage values are with respect to the SW terminal.

Copyright © 2009–2012, Texas Instruments Incorporated Submit Documentation Feedback 3

Product Folder Link(s): TPS51218

TPS51218

SLUS935B –MAY 2009– REVISED FEBRUARY 2012

ELECTRICAL CHARACTERISTICS

over recommended free-air temperature range, V5IN=5V. (Unless otherwise noted)

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

SUPPLY CURRENT

I

V5IN

I

V5INSDN

V5IN supply current 320 500 μA
V5IN shutdown current V5IN current, TA= 25°C, No Load, VEN= 0 V 1 μA

INTERNAL REFERENCE VOLTAGE

V

I

VFB

VFB

VFB regulation voltage

VFB input current V

OUTPUT DISCHARGE

I

Dischg

Output discharge current from
SW pin

OUTPUT DRIVERS

R

R

t

D

DRVH

DRVL

DRVH resistance

DRVL resistance

Dead time ns

BOOT STRAP SWITCH

V

FBST

I

VBSTLK

Forward voltage V
VBST leakage current V

DUTY AND FREQUENCY CONTROL

t

OFF(min)

t

ON(min)

Minimum off-time TA= 25°C 150 260 400
Minimum on-time 79

SOFTSTART

t

ss

Internal SS time From VEN= high to V

POWERGOOD

V

THPG

I

PGMAX

t

PGDEL

PG threshold PG in from higher 107.5% 110% 112.5%

PG sink current V
PG delay Delay for PG in 0.8 1 1.2 ms

LOGIC THRESHOLD AND SETTING CONDITIONS

V

EN

I

EN

f

SW

V

RF

EN voltage threshold V

EN input current VEN= 5V 1.0 μA

Switching frequency kHz

CCM setting voltage V

(1) Ensured by design. Not production tested.
(2) Not production tested. Test condition is VIN= 8 V, V

V5IN current, TA= 25°C, No Load,
VEN= 5 V, V

VFB voltage, CCM condition

VFB

= 0.735 V

(1)

TA= 25°C, skip mode 0.7005 0.7040 0.7075
TA= 0°C to 85°C, skip mode 0.6984 0.7040 0.7096 V
TA= –40°C to 85°C, skip mode 0.6970 0.7040 0.7110

= 0.735 V, TA= 25°C, skip mode 0.01 0.2 μA

VFB

VEN= 0 V, VSW= 0.5 V 5 13 mA

Source, I
Sink, I
Source, I
Sink, I

= –50 mA 1.5 3

DRVH

= 50 mA 0.7 1.8

DRVH

= –50 mA 1.0 2.2

DRVL

= 50 mA 0.5 1.2

DRVL

DRVH-off to DRVL-on 7 17 30
DRVL-off to DRVH-on 10 22 35

V5IN-VBST
VBST

VIN= 28 V, V
TA= 25°C

, IF= 10 mA, TA= 25°C 0.1 0.2 V

= 34.5 V, VSW= 28 V, TA= 25°C 0.01 1.5 μA

= 0.7 V, RRF= 39kΩ,

OUT

(1)

= 95% 1 ms

OUT

PG in from lower 92.5% 95% 97.5%

PG hysteresis 2.5% 5% 7.5%

= 0.5 V 3 6 mA

PGOOD

Enable 1.8
Disable 0.5

RRF= 470 kΩ, TA= 25°C
RRF= 200 kΩ, TA= 25°C
RRF= 100 kΩ, TA= 25°C
RRF= 39 kΩ, TA= 25°C

(2)
(2)
(2)

(2)

CCM 1.8
Auto-skip 0.5

OUT

= 1.1 V, I

= 10 A using application circuit shown in Figure 21.

OUT

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0.7000 V

Ω

ns

266 290 314
312 340 368
349 380 411
395 430 465

4 Submit Documentation Feedback Copyright © 2009–2012, Texas Instruments Incorporated

Product Folder Link(s): TPS51218

TPS51218

www.ti.com

ELECTRICAL CHARACTERISTICS (continued)

over recommended free-air temperature range, V5IN=5V. (Unless otherwise noted)

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

PROTECTION: CURRENT SENSE

I

TRIP

TC

ITRIP

V

TRIP

V

OCL

V

OCLN

V

AZCADJ

PROTECTION: UVP AND OVP

V

OVP

t

OVPDEL

V

UVP

t

UVPDEL

t

UVPEN

UVLO

V

UVV5IN

THERMAL SHUTDOWN

T

SDN

(3) Ensured by design. Not production tested.

TRIP source current V
TRIP current temperature

coeffficient
Current limit threshold setting

range

Current limit threshold V

Negative current limit threshold V

Adaptive zero cross adjustable
range

= 1V, TA= 25°C 9 10 11 μA

TRIP

On the basis of 25°C 4700 ppm/°C

V

TRIP-GND

V

TRIP
TRIP

V

TRIP

V

TRIP
TRIP

V

TRIP

Voltage 0.2 3 V

= 3.0 V 355 375 395
= 1.6 V 185 200 215 mV
= 0.2 V 17 25 33
= 3.0 V –395 –375 –355
= 1.6 V –215 –200 –185 mV

= 0.2 V –33 –25 –17
Positive 3 15
Negative –15 –3

OVP trip threshold OVP detect 115% 120% 125%
OVP propagation delay time 50-mV overdrive 1 μs
Output UVP trip threshold UVP detect 65% 70% 75%
Output UVP propagation delay

time
Output UVP enable delay time From Enable to UVP workable 1.0 1.2 1.4 ms

V5IN UVLO threshold V

Thermal shutdown threshold °C

Wake up 4.20 4.38 4.50
Shutdown 3.7 3.93 4.1

Shutdown temperature
Hysteresis

(3)

(3)

SLUS935B –MAY 2009– REVISED FEBRUARY 2012

mV

0.8 1 1.2 ms

145

10

Copyright © 2009–2012, Texas Instruments Incorporated Submit Documentation Feedback 5

Product Folder Link(s): TPS51218

1

2

3

4

5

10

9

8

7

6

PGOOD

TRIP

EN

VFB

RF

VBST

DRVH

SW

V5IN

DRVL

TPS51218DSC

GND

DSC PACKAGE

(TOP VIEW)

TRIP

OCL

V

V8=

TPS51218

SLUS935B –MAY 2009– REVISED FEBRUARY 2012

DEVICE INFORMATION

Thermal pad is used as an active terminal of GND.

PIN FUNCTIONS

PIN

NAME NO.

DRVH 9 O

DRVL 6 O
EN 3 I SMPS enable pin. Short to GND to disable the device.
GND I Ground

PGOOD 1 O voltage. Continuous current capability is 1 mA. PGOOD goes high 1 ms after VFB becomes within

Thermal

Pad

I/O DESCRIPTION

High-side MOSFET driver output. The SW node referenced floating driver. The gate drive voltage is
defined by the voltage across VBST to SW node bootstrap flying capacitor

Synchronous MOSFET driver output. The GND referenced driver. The gate drive voltage is defined by
V5IN voltage.

Power Good window comparator open drain output. Pull up with resistor to 5 V or appropriate signal
specified limits. Power bad, or the terminal goes low, after a 2- μs delay.

Switching frequency selection. Connect a resistance to select switching frequency as shown in Table 1.

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RF 5 I Auto-skip or forced CCM selection.

SW 8 I

TRIP 2 I

V5IN 7 I 5 V +30%/–10% power supply input.
VBST 10 I
VFB 4 I SMPS feedback input. Connect the feedback resistor divider.

6 Submit Documentation Feedback Copyright © 2009–2012, Texas Instruments Incorporated

The switching frequency is detected and stored into internal registers during startup. This pin also controls

Pull down to GND with resistor : Auto-Skip
Connect to PGOOD with resistor: forced CCM after PGOOD becomes high.

Switch node. A high-side MOSFET gate drive return. Also used for on time generation and output
discharge.

OCL detection threshold setting pin. 10 μA at room temperature, 4700 ppm/°C current is sourced and set
the OCL trip voltage as follows.

(0.2 V ≤ V

Supply input for high-side MOSFET driver (bootstrap terminal). Connect a flying capacitor from this pin to
the SW pin. Internally connected to V5IN via bootstrap MOSFET switch.

Product Folder Link(s): TPS51218

TRIP

≤ 3 V)

GND

SW

TPS51218

OCP

ZC

XCON

RF

FCCM

VBST

V5IN

PWM

VFB

TRIP

Auto-skip/FCCM

+

+

Delay

0.7 V +10/15%

0.7 V –5/10%

PGOOD

Control Logic

UDG-09065

10 mA

+

+

0.7 V –30%

0.7 V +20%

+

+

EN

Ramp Comp

Enable/SS Control

+

+

+

+

0.7 V

x(-1/8)

x(1/8)

Frequency

Setting

Detector

DRVH

DRVL

t

ON

One-

Shot

Auto-skip

UV

OV

TPS51218

www.ti.com

SLUS935B –MAY 2009– REVISED FEBRUARY 2012

FUNCTIONAL BLOCK DIAGRAM

Copyright © 2009–2012, Texas Instruments Incorporated Submit Documentation Feedback 7

Product Folder Link(s): TPS51218

–50

200

0

0

50 100 150

600

400

1000

800

V

V5IN

= 5 V

VEN= 5 V

V

VFB

= 0.735 V

No Load

TJ– Junction Temperature – °C

I

V5IN

– V5IN Supply Current – mA

–50

0

0 50 100 150

TJ– Junction Temperature – °C

4

12

8

20

16

I

V5INSDN

– V5IN Shutdown Current – mA

10

6

18

14

2

V

V5IN

= 5 V

VEN= 0 V
No Load

–50

0

0 50 100 150

TJ– Junction Temperature – °C

150

V

OVP

/V

UVP

– OVP/UVP Trip Threshold – %

50

100

OVP

V

V5IN

= 5 V

UVP

–50 0 50 100 150

TJ– Junction Temperature – °C

V

V5IN

= 5 V

V

TRIP

= 1 V

0

4

12

8

20

16

I

TRIP

– Current Sense Current – mA

10

6

18

14

2

TPS51218

SLUS935B –MAY 2009– REVISED FEBRUARY 2012

V5IN SUPPLY CURRENT V5IN SHUTDOWN CURRENT

vs vs

JUNCTION TEMPERATURE JUNCTION TEMPERATURE

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TYPICAL CHARACTERISTICS

Figure 1. Figure 2.

OVP/UVP THRESHOLD CURRENT SENSE CURRENT (I

vs vs

JUNCTION TEMPERATURE JUNCTION TEMPERATURE

TRIP

)

Figure 3. Figure 4.

8 Submit Documentation Feedback Copyright © 2009–2012, Texas Instruments Incorporated

Product Folder Link(s): TPS51218

6

200

10 14 18 22

VIN– Input Voltage – V

250

500

f

SW

– Switching Frequency – kHz

350

300

450

400

IO= 10 A
Auto-Skip

8 12 16 20

RRF= 100 kW

RRF= 39 kW

RRF= 200 kW

RRF= 470 kW

0.001

0.1

0.01 100

I

OUT

– Output Current – A

1

1000

f

SW

– Switching Frequency – kHz

10

100

VIN= 12 V

RRF= 470 kW

0.1 1 10

FCCM

Auto-Skip

0.001

0.1

0.01 100

1

1000

f

SW

– Switching Frequency – kHz

10

100

VIN= 12 V

RRF= 200 kW

0.1 1 10

FCCM

Auto-Skip

I

OUT

– Output Current – A

0.001

0.1

0.01 100

1

1000

f

SW

– Switching Frequency – kHz

10

100

VIN= 12 V

RRF= 100 kW

0.1 1 10

FCCM

Auto-Skip

I

OUT

– Output Current – A

TPS51218

www.ti.com

SLUS935B –MAY 2009– REVISED FEBRUARY 2012

TYPICAL CHARACTERISTICS (continued)

SWITCHING FREQUENCY SWITCHING FREQUENCY

vs vs

INPUT VOLTAGE OUTPUT CURRENT

Figure 5. Figure 6.

SWITCHING FREQUENCY SWITCHING FREQUENCY

vs vs

OUTPUT CURRENT OUTPUT CURRENT

Copyright © 2009–2012, Texas Instruments Incorporated Submit Documentation Feedback 9

Figure 7. Figure 8.

Product Folder Link(s): TPS51218