THV3011 - THine Electronics, Inc.

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THV3011_Rev.1.00_E

THine Electronics, Inc.

Description

THV301 1 is a synchronous buck switching regulator

IC with the external High side Power MOSFET.

Available high current power supply using a mini-

mum number of external components, because any

external phase compensation parts are not necessary.

The bootstrap technology provides high efficiency

more than 97%. Utilizing the latest and THine’s

unique architecture, THV3011 achieves ultra quick

transient response.

Soft start by SS pins makes constant and stable soft

start curve not depend on the load fluctuation.

THV3011 also ha s the Power-good function and th e

Off-delay function to facilitate the setting of On/Off

sequence.

Features

• Synchronous rectifier DC/DC converter

• Wide input voltage range : 7.5~ 28V

• Output voltage range : 0.85~4.0V

• Large Load current (depend on external FET)

• Ultra quick transient response

• Feed back voltage accura cy : 1%

• 360kHz/500kHz programmable osc illation frequency

• Over current protection

• Short circuit protection (latch function)

• Undervoltage lockout function

• Power-good function

• Off Delay function

• Programmable soft start

• Thermal shutdown

• Small 4.4x5mm body TSSOP 16pin

1ch DC/DC converter

THV3011

Applications

• Micro processor core/ASIC/FPGA/DSP/DDR

SDRAM/DDRII SDRAM power supply

Ty pical Applications

CTL input

Input

Power Good output

BOOT

AVCC

CTL

PSI

REG

PGOOD

FSET

OFFDELAY

CSN

CSP

GND

PSI input

Output

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Absolute maximum ratings

Parameter Symbol Rating Units

AVCC Vcc -0.3 ~30 V

PSI, FB, OFFDELAY, CSP, CSN, SS VL_in_1 -0.3 ~ 5.5 V

FSET VL_in_2 -0.3 ~ REG+0.3 V

CTL Vctl -0.3 ~ 30 V

PGOOD Vpgood -0.3 ~ 5.5 V

BOOT Vboot -0.3 ~ 35 V

Between BOOT and LL Vll -0.3 ~ 5.5 V

Power Dissipation Pd 1.0 W

Junction Temperature Tj +125 °C

Operating Temperature Ta -40 ~ +85 °C

Storage Temperature Tstg -55 ~ +150 °C

Lead Temperature for Sol dering Tlead 255 +5 °C/-0°C/ 10sec °C

Recommended Operation Conditions

Parameter Symbol Min Max Units

Input Supply Voltage AVCC 7.5 28 V

Output voltage VO 0.85 4.0 V

Block Diagram

Level

shift HG

AVCC CTL

GND

BOOT

REG

FSET

Power

Good

Main

Control

Frequecy

setup

Regulator

REG

OCP

TSD

SCP

OCP

REG

Power

LinkerTM

OFFDELAY

UVLO

PGOOD

CTL

TSD

CSP

CSN

PSI

REG

CTL

SCP

Short circuit

protection

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THine Electronics, Inc.

Electrical Characteristics (AVCC=12V, Vctl=3.3V, Ta=25°C, unless otherwise noted.)

Parameter Symbol Conditions Min Typ Max Units

Operation current Icc 1.5 3.0 mA

Stand-by current Ist Vctl=0V 20 40 uA

Regulator output voltage Vreg Ireg=0.1mA 4.75 5.00 5.25 V

Regulator maximum l oad cur-

rent Ireg 30 mA

Oscillation Frequency 1 Fosc1 FSET=REG, Vpsi=REG 320 360 400 kHz

Oscillation Frequency 2 Fosc2 FSET=OPEN, Vpsi=REG 440 500 560 kHz

Minimum operation frequency Foscmin Vpsi=0V 8 kHz

Minimum On pulse tonmin 100 nsec

Minimum Off pulse toffmin 250 nsec

Feed back voltage Vfb 0.8415 0.850 0.8585 V

Feed back bias current Ivoset -50 0 50 nA

Current sense offset voltage dVcs CSN=1.8V 50 60 70 mV

SCP threshold voltage Vscp 0.6 V

SCP delay time tscp 4.1 msec

Low gate driver high side On

resistance RonLH ILH=20mA 3.5

Low gate driver low side On

resistance RonLL ILL=20mA 2.0

High gate driver high side On

resistance RonHH IHH=20mA 3.5

High gate driver low side On

resistance RonHL IHL=20mA 1.5

Under voltage threshold Vuvlo 6.0 6.5 7 .0 V

Under voltage hysteresis Vuvlo-h 0.17 V

Soft start time tss Css=1000pF 0.300 0.425 0.550 msec

PSI high input voltage Vpsih 4.2 V

PSI low input voltage Vpsil 0.3 V

PSI input bias current Ipsi Vpsi=5V 12.5 uA

Output pull-down On resis-

tance RonCSP Vctl=0V 35 Ω

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THine Electronics, Inc.

Parameter Symbol Conditions Min Typ Max Units

CTL ON threshold voltage Vctlon 1.5 V

CTL OFF threshold voltage Vctloff 0.7 V

CLT input current Ictl Vctl=3.3V 1.5 3.0 uA

Off delay time toffdelay Coffdelay=1000pF 0.75 msec

Power good threshold voltage Vpgood 0.65 0.70 0.75 V

Power good hysteresis voltage Vpgood-h 100 mV

Power good output ON resis-

tance Ronpgood Vpgood=0.1V 1.0 2.0 kΩ

Power good output off leak

current Ioffpgood Vpgood=5V 1 uA

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THine Electronics, Inc.

Pin Description

Pin Symbol Function

1 AVCC Power supply for control bl ock.

2 PSI Power standby Indicati on. Applying low level voltage to this pin, IC

goes into the light load mode. Applying high level, IC operates in the

synchronous mode.

3 BOOT Bootstrap pin. Bias input for high side power MOSFET driver.

4 LL Switching output. Connect to the inductor node.

5FSET

Oscillation frequency setting pin. Connect to REG for 360kHz, leave it

open for 500kHz.

6 HG High side gate dr iv e output.

7 OFFDELAY Shut-off delay time setting. Connect a capacitor to the GND.

8 LG Low gate drive output.

9 GND Ground.

10 PGOOD Power good output. PGOOD outputs High level, when CTL pin is High

level and output voltage is 82.4% or more of set vol tage.

11 CSN Current sense negative input.

12 CSP

Current sense positive input. When 60mV(typ) or more of voltage dif-

ference is detected between CSP pin and CSN pin, the voltage on LL

pin falls down to the low level. When the voltage on CTL pin is low

level, the transistor turns to the On state and pull-down the output volt-

age.

13 FB Output voltage feedback.

14 SS Soft start time setting pin. Connect a capacitor to the GND.

15 CTL Enable pin. Active at high level. CTL pin can be set at the voltage

higher than AVCC.

16 REG 5V regulator output. Internal power supply for Bootstrap and control

circuit. Connect a capacitor to the GND.

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THine Electronics, Inc.

Power Dissipation

-40 -20 0 20 40 60 80 100 120 140 160

0 0.2 0.4 0.6 0.8 1.0 1.2 1.4

Operating Temperature [°C]

Power Dissipation [W]

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THine Electronics, Inc.

●Thermal Shut Down (TSD)

THV3011 has the built-in Thermal Shutdown circuit to prevent damages caused by excessive heat. When the

junction temperature reaches 125 ℃(typ), TSD circuit stops switching operation and 5V regulator opera-

tion. When falls down (20 typical hysteresis), the output voltage will recover.

°C

Functional Description

●Soft Start (SS)

THV3011 has soft start circuit allows a gradual rising of output voltage to prevent overshooting of ou tput volt-

age and high inrush current during start up. When UVLO is released and CTL pin is turned High level, an inter-

nal 2uA constant current source starts to charge an external capacitor connected to SS pin.

Css connected between SS pin and GND is determined by soft start time. Soft start time is the period of charg-

ing SS pin to the reference voltage 0.85V with 2uA constant current source, and calculated as following :

When Tss=4.25msec, Css=0.01uF.

●Undervoltage Lockout (UVLO)

THV3011 has the built-in Undervoltage Lockout circuit to prevent the device from misoperation at low input

voltages. UVLO stops switching operation and soft start operation, until AVCC voltage rises up to 6.5V(typ).

Having the hysteresis circuit, UVLO stops switching operation and start to discharge SS pins, when AVCC

voltage falls down under 6.33V(typ).

●Over Current Protection (OCP)

THV3011 has the built-in Over Current Protection circuit to limit over current caused by abnormal load cur-

rent, etc. When a voltage difference between CSN pin and CSP pin exceeds 60mV(typ), OCP detects over cur-

rent.

OCP circuit monitors the bottom current of inductor to detect over current. When the voltage between CSN pin

and CSP pin drops below 60mV(typ), High sid e FET generates on-pulse. Therefore the average value of ripple

current is added to the output current as following :

rip

OUT

I =

RVm60 + RIP

1(A)

●Short Cir cui t Protection (SCP)

SCP circuit is activated, when the output voltage drop continues. After soft start operatio n is finish ed and feed-

back voltage drop s less than 0.6V(typ), SCP detects a short circuit. If such condition continues for more than

4.1msec(typ), the device stops switching operation and go into latch state. The latch sta te will be released by

restarting to apply voltage on CTL pin o r AVCC pin.

T°C

out

mV60

Tss = Αu2 V850.

C = 0.425×6

10 ×Css (sec)

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THine Electronics, Inc.

●Off Delay (OFFDELAY)

Off Delay function works to set the delay time from when Low level voltage is applied on CTL pin till the

device goes into standby state. The delay time can be set by connecting a capacitor between OFFDELAY pin

and GND.

The delay time is the period that OFFDELAY pin is discharged with 4uA(typ) constant current source

from 5.0V to threshold 2.0V(typ), and is calculated as follows.

When off delay time = 7.5msec, = 0.01uF.

T =

()

uA04 V02

REGOFFD VC ＝ 7.5 × 6

10 × OFFD

C(sec)

●Power Good (PGOOD)

Power Good is a function to notify external circuits that the output voltage has reached to the normal voltage,

and available as a sequence control or a reset signal for micro-processor. When the output voltage exceeds

82.4%(typ) of the user defined voltage, PGOOD pin is turned from Low level to High level. When the output

voltage drops(70.6% typical hysteresis), PGOOD pin is turned to Low level. When CTL pin is turned Low

level, PGOOD pin is also turned Low level independent of the output voltage.

Please beware of following matters, when PGOOD pin is pulled-up to the external power source.

The output transistor of PGOOD pin becomes active only when higher voltage than 2.5V is applied to AVCC.

Therefore, PGOOD pin operates as follows.

1.When AVCC voltage is less than 2.5V, PGOOD pin is High level even though the output voltage doesn’t

reach to the user defined voltage.

2.When AVCC voltage exceeds 2.5V, PGOOD pin is turned Low level.

3.When AVCC voltage reaches to 82.4%(typ) of the user defined voltage after the release of UVLO.

CTL

OFFDELAY

VOUT

CTL

OFFDELAY

VOUT

2.0V

×-

OFFD

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THine Electronics, Inc.

●Setting the Output Voltage

THV3011 detects the output ripple voltage. When the output voltage reaches to the voltage defined

by (between output capacitor and FB pin) and ( between FB pin and GND) as following

formula, LL pin is turned from Low to High level for a constant time.

DC output voltage at the continuous mode is calculated as following formula, a dding the average of the ripple

voltage ( ).

●Power Stand-by Indicator (PSI)

Continuous/Light Load modes are selec table by PSI pin, H igh or Low. High = contin uous mode, Low = light

load mode. LG pin is held Low and stops the operation of Low side FET in the light load mode.

32 RR +

bottomOUT

V_ = FB

V×⎟

⎟

⎠

⎞

⎜

⎝

⎛+

1RRR

rip

IESR

OUT

V = ⎟

⎟

⎠

⎞

⎜

⎝

⎛+

1RRR ×0.85V + ESRRIP RI

●Output Pull-Down

THV3011 has a built-in Output Pull-Down function to shorten the output fall time. When CTL pin is turned to

Low, an internal transistor connected between CSP pin and GND st art to discharge the output capacitor.

●Setting the Oscillation Frequency (FSET)

User can choose Oscillation frequency 360kHz or 500kHz by adjusting the voltage on FSET pin. High =

360kHz(typ), Open = 500kHz(typ).

GND

Output

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THine Electronics, Inc.

●Application Exam ple

　Ex.) VCC=12V, VOUT=1.2

PGOOD

CSN

CSP

CTL

REG

OFFDELAY

PVCC

FSET

BOOT

PSI

GND

PGOOD

CSN

CSP

CTL

REG

OFFDELAY

FSET

BOOT

PSI

AVCC

CTL

PGOOD

VOUT=1.2V

VCC=12V

L1 2.5uH

220uF/4V

1uF

R1 12mOhm

0.1uF

PSI

U1 THV3011

150Ohm R3

3.9kOhm

10kOhm C6

0.01uF

47kOhm C3

10uF/25V

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THV3011_Rev.1.00_E

THine Electronics, Inc.

0.90 +0.05 /-0.05

0-10(deg)

1.10MAX

0.10 +0.05/-0 .05

0.60 +0.10/-0.10

1.00

0.25

The details of lead edge

Unit : mm

0.10 S

0.22

0.65

5.00 +0.10/-0.10

4.40 +0.10/-0.10

6.40 +0.10/-0.10

TSSOP16 Pins

Package Outline

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THine Electronics, Inc.

Notices and Requests

1. The product specifications described in this material are subject to change without prior notice.

2. The circuit diagrams described in this material are examples of the application which may not

always apply to the customer's design. We are not responsible for possible errors and omissions

in this material. Please note if errors or omissions should be found in this material, we may not

be able to correct them immediately.

3. This material contains our copy right, know-how or other proprietary. Copying or disclosing to

third parties the contents of this material without our prior permission is prohibited.

4. Note that if infringement of any third party's industrial ownership should occur by using this

product, we will be exempted from the responsibility unless it directly relates to the production

process or functions of the product.

5. This product is presumed to be used for general electric equipment, not for the applications

which require very high reliability (including medical equipment directly concerning people's

life, aerospace equipment, or nuclear control equipment). Also, when using this product for the

equipment concerned with the control and safety of the transportation means, the traffic signal

equipment, or various Types of safety equipment, please do it after applying appropriate

measures to the product.

6. Despite our utmost efforts to improve the quality and reliability of the product, faults will occur

with a certain small probability, which is inevitable to a semi-conductor product. Therefore, you

are encouraged to have suff iciently redundant or error preventive design applied to the use of the

product so as not to have our product cause any social or public damage.

7. Please note that this product is not designed to be radiation-proof.

8. Customers are asked, if required, to judge by themselves if this product falls under the category

of strategic goods under the Foreign Exchange and Foreign Trade Control Law.

9. The product or peripheral parts may be damaged by a surge in voltage over the absolute maxi-

mum ratings or malfunction, if pins of the product are shorted by such as foreign substance. The

damages may cause a smoking and ignition. Therefore, you are encouraged to implement safety

measures by adding protection devices, such as fuses.

THine Electronics, Inc.

E-mail : sales@thine.co.jp