THV3011_技术文档

THV3011_Rev.1.00_E

THV3011

1ch DC/DC converter

Features

Description

• 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 accuracy : 1%

• 360kHz/500kHz programmable oscillation frequency

• Over current protection

• Short circuit protection (latch function)

• Undervoltage lockout function

• Power-good function

• Off Delay function

• Programmable soft start

THV3011 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 has the Power-good function and the

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

sequence.

• Thermal shutdown

• Small 4.4x5mm body TSSOP 16pin

Applications

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

SDRAM/DDRII SDRAM power supply

Input

CTL input

AVCC

CTL

PSI

PSI input

FSET

REG

OFFDELAY

SS

PGOOD

Power Good output

GND

FB

BOOT

HG

Output

CSN

CSP

LL

LG

Typical Applications

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THine Electronics, Inc.

THV3011_Rev.1.00_E

Absolute maximum ratings

Parameter

Symbol

Vcc

Rating

-0.3 ~30

-0.3 ~ 5.5

-0.3 ~ REG+0.3

-0.3 ~ 30

-0.3 ~ 5.5

-0.3 ~ 35

-0.3 ~ 5.5

1.0

Units

V

AVCC

PSI, FB, OFFDELAY, CSP, CSN, SS

VL_in_1

VL_in_2

Vctl

V

FSET

V

CTL

V

PGOOD

Vpgood

Vboot

Vll

V

BOOT

V

Between BOOT and LL

Power Dissipation

Junction Temperature

V

Pd

W

Tj

+125

°C

Operating Temperature

Storage Temperature

Ta

-40 ~ +85

-55 ~ +150

Tstg

Tlead

Lead Temperature for Soldering

255 +5 °C/-0°C/ 10sec

Recommended Operation Conditions

Parameter

Symbol

AVCC

VO

Min

7.5

Max

28

Units

V

Input Supply Voltage

Output voltage

0.85

4.0

V

CTL

OFFDELAY

PGOOD

AVCC

CTL

Power

Good

REG

5V

Regulator

UVLO

Linker^TM

REG

FB

CSP

CSN

TSD

OCP

BOOT

CTL

HG

LL

Level

shift

REG

OCP

TSD

SCP

SS

FB

REG

Main

Control

LG

GND

SCP

Short circuit

protection

Frequecy

setup

FSET

PSI

Block Diagram

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THine Electronics, Inc.

THV3011_Rev.1.00_E

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

Parameter

Symbol

Icc

Conditions

Min

Typ

1.5

Max

3.0

Units

mA

uA

Operation current

Stand-by current

Regulator output voltage

Ist

Vctl=0V

20

40

Vreg

Ireg=0.1mA

4.75

30

5.00

5.25

V

Regulator maximum load cur-

rent

Ireg

mA

Oscillation Frequency 1

Oscillation Frequency 2

Minimum operation frequency

Minimum On pulse

Fosc1

Fosc2

Foscmin

tonmin

toffmin

Vfb

FSET=REG, Vpsi=REG

FSET=OPEN, Vpsi=REG

Vpsi=0V

320

440

360

500

8

400

560

kHz

nsec

V

100

250

0.850

0

Minimum Off pulse

Feed back voltage

0.8415

-50

0.8585

50

Feed back bias current

Current sense offset voltage

SCP threshold voltage

SCP delay time

Ivoset

dVcs

nA

CSN=1.8V

50

60

70

mV

V

Vscp

0.6

4.1

tscp

msec

Low gate driver high side On

resistance

RonLH

RonLL

RonHH

RonHL

ILH=20mA

ILL=20mA

IHH=20mA

IHL=20mA

3.5

2.0

3.5

1.5

Ω

Low gate driver low side On

resistance

High gate driver high side On

resistance

High gate driver low side On

resistance

Under voltage threshold

Under voltage hysteresis

Soft start time

Vuvlo

Vuvlo-h

tss

6.0

6.5

0.17

0.425

7.0

0.550

0.3

V

Css=1000pF

0.300

4.2

msec

V

PSI high input voltage

PSI low input voltage

PSI input bias current

Vpsih

Vpsil

Ipsi

V

Vpsi=5V

Vctl=0V

12.5

35

uA

Output pull-down On resis-

tance

RonCSP

Ω

3/12

THine Electronics, Inc.

THV3011_Rev.1.00_E

Parameter

Symbol

Vctlon

Vctloff

Ictl

Conditions

Min

Typ

Max

Units

V

CTL ON threshold voltage

CTL OFF threshold voltage

CLT input current

1.5

0.7

3.0

V

Vctl=3.3V

1.5

0.75

0.70

100

uA

msec

V

Off delay time

toffdelay

Vpgood

Coffdelay=1000pF

Power good threshold voltage

0.65

0.75

Power good hysteresis voltage Vpgood-h

mV

Power good output ON resis-

Ronpgood

tance

Vpgood=0.1V

Vpgood=5V

1.0

2.0

1

kΩ

Power good output off leak

Ioffpgood

current

uA

4/12

THine Electronics, Inc.

THV3011_Rev.1.00_E

Pin Description

1

Symbol

AVCC

Function

Power supply for control block.

Power standby Indication. Applying low level voltage to this pin, IC

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

synchronous mode.

2

PSI

3

4

BOOT

LL

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

Switching output. Connect to the inductor node.

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

open for 500kHz.

5

6

FSET

HG

High side gate drive output.

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

Low gate drive output.

7

8

9

OFFDELAY

LG

GND

Ground.

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

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

10

11

PGOOD

CSN

Current sense negative input.

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.

12

CSP

13

14

FB

SS

Output voltage feedback.

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

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

higher than AVCC.

15

16

CTL

REG

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

circuit. Connect a capacitor to the GND.

5/12

THine Electronics, Inc.

THV3011_Rev.1.00_E

Power Dissipation

-40 -20

0

20 40 60 80 100 120 140 160

Operating Temperature [°C]

6/12

THine Electronics, Inc.

THV3011_Rev.1.00_E

Functional Description

● 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).

● Thermal Shut Down (TSD)

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

T

°C

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

junction temperature

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

j

°C

T

j

● Soft Start (SS)

THV3011 has soft start circuit allows a gradual rising of output voltage to prevent overshooting of output 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 :

C_SS0.85 V

×

Tss =

= 0.425×10⁶×Css (sec)

2uΑ

When Tss=4.25msec, Css=0.01uF.

● 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 side FET generates on-pulse. Therefore the average value of ripple

current

is added to the output current as following :

I

rip

60 mV

1

2

I _OUT

=

+

I _RIP(A)

R_S

I_L

I_out

60mV

R

s

● Short Circuit Protection (SCP)

SCP circuit is activated, when the output voltage drop continues. After soft start operation is finished and feed-

back voltage drops 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 state will be released by

restarting to apply voltage on CTL pin or AVCC pin.

7/12

THine Electronics, Inc.

THV3011_Rev.1.00_E

● 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.

● 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.

CTL

OFFDELAY

2.0V

VOUT

T_OD

T

The delay time

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

OD

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

×

-

C_OFFD

(

V_REG2.0V

)

T_OD

=

＝ 7.5 × 10⁶× C_OFFD(sec)

4.0uA

C

When off delay time = 7.5msec,

= 0.01uF.

OFFD

8/12

THine Electronics, Inc.

THV3011_Rev.1.00_E

● Setting the Output Voltage

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

R₄

by R₂+ R₃(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.

⎛

⎜

⎝

⎞

⎟

⎠

R₂+ R₃

⎜

V

= V_FB× 1 +

OUT _ bottom

R₄

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

voltage ( I ).

R_ESR

×

rip

⎛

⎜

⎝

⎞

⎟

⎠

R +R

1

2

3

⎜

V

= 1+

×0.85V +

I_RIPR

OUT

ESR

R

4

Output

R2

R3

R4

FB

GND

● Power Stand-by Indicator (PSI)

Continuous/Light Load modes are selectable by PSI pin, High or Low. High = continuous mode, Low = light

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

● 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 start 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).

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THine Electronics, Inc.

THV3011_Rev.1.00_E

● Application Example

ꢀ Ex.) VCC=12V, VOUT=1.2

PGOOD

VCC=12V

C5

0.01uF

R5

47kOhm

C3

10uF/25V

U1 THV3011

LG

GND

Q1

PGOOD

PGOOD OFOFFDFEDLEALYAY

Q2

CSN

HG

PVCC

L1 2.5uH

VOUT=1.2V

R1 12mOhm

CSP

FSET

R2

150Ohm

R3

3.9kOhm

FB

LL

SS

C2

0.1uF

BOOT

SS

C1

220uF/4V

R4

10kOhm

CTL

PSI

C6

0.01uF

REG

AVCC

C4

1uF

PSI

CTL

10/12

THine Electronics, Inc.

THV3011_Rev.1.00_E

Package Outline

TSSOP16 Pins

1.10MAX

0.90 +0.05/-0.05

0.65

0.10 S

0.22

5.00 +0.10/-0.10

0.25

0.60 +0.10/-0.10

1.00

0-10(deg)

0.10 +0.05/-0.05

The details of lead edge

Unit : mm

11/12

THine Electronics, Inc.

THV3011_Rev.1.00_E

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 sufficiently 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

12/12

THine Electronics, Inc.


型号：	THV3011
厂家：	THINE ELECTRONICS, INC.
描述：	1ch DC/DC converter 1ch的DC / DC变换器
文件：	总12页 (文件大小：249K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

THV3011 [THINE]

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