Fujitsu MB39A105 Manuale utente

DS04-27233-2E

FUJITSU SEMICONDUCTOR

DATA SHEET

ASSP For Power Supply Applications

(General Purpose DC/DC Converter)

1-ch DC/DC Converter IC

for low voltage

MB39A105

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■■

■DESCRIPTION

The MB39A105 is 1-channel DC/DC converter IC using pulse width modulation (PWM). This IC is ideal for up

conversion.

The minimum operating voltage is low (1.8 V) , and the MB39A105 is best for built-in power supply such as LCD

monitors. Also the short-circuit protection detection output function prevents input/output short on a chopper type

up-converter.

This product is covered by US Patent Number 6,147,477.

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■FEATURES

• Power supply voltage range : 1.8 V to 6 V

• Reference voltage accuracy : ±1 %

• High-frequency operation capability : 1 MHz (Max)

• Built-in standby function: 0 µA (Typ)

• Built-in timer-latch short-circuit protection circuit

• Built-in short-circuit protection detection output function

• Built-in soft-start circuit independent of loads

• Built-in totem-pole type output for Nch MOS FET

• Package : TSSOP-8P (Thickness 1.1 mm Max)

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■PACKAGE

8-pin plastic TSSOP

(FPT-8P-M05)

MB39A105

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■PIN ASSIGNMENT

(TOP VIEW)

(FPT-8P-M05)

−INE

CSCP

VCC

SCPOD

GND

OUT

MB39A105

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■PIN DESCRIPTION

Pin No. Symbol I/O Descriptions

1−INE I Error amplifiers (Error Amp) inverted input terminal

2CSCPTimer-latch short-circuit protection capacitor connection terminal

3VCCPower supply terminal

4SCPODO

Open drain output terminal for short-circuit protection detection

During timer-latch short-circuit protection operation : Output “High-Z”

During normal operation : Output “L”

5 OUT O External Nch FET gate drive terminal

6GNDGround terminal

7RTTriangular wave oscillation frequency setting resistor connection terminal

8 FB O Error Amplifier (Error Amp) output terminal

MB39A105

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■BLOCK DIAGRAM

−

−INE

CSCP

GND

OUT

43 SCPODVCC

VREF

Error Amp

SCP

Comp.

PWM

Comp. Drive

Nch

IO=400 mA

at VCC =3.3 V

(0.5 V ±1%)

±10%

(1.0 V)

UVLO

OSC

(0.9 V)

(0.7 V)

(0.3 V)

bias

RT Current

VREF Power

ON/OFF

CTL

VREF

(1.27 V)

L : UVLO release

MB39A105

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■ABSOLUTE MAXIMUM RATINGS

* : The packages are mounted on the epoxy board (10 cm ×10 cm).

WARNING: Semiconductor devices can be permanently damaged by application of stress (voltage, current,

temperature, etc.) in excess of absolute maximum ratings. Do not exceed these ratings.

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■RECOMMENDED OPERATING CONDITIONS

WARNING: The recommended operating conditions are required in order to ensure the normal operation of the

semiconductor device. All of the device’s electrical characteristics are warranted when the device is

operated within these ranges.

Always use semiconductor devices within their recommended operating condition ranges. Operation

outside these ranges may adversely affect reliability and could result in device failure.

No warranty is made with respect to uses, operating conditions, or combinations not represented on

the data sheet. Users considering application outside the listed conditions are advised to contact their

FUJITSU representatives beforehand.

Parameter Symbol Condition Rating Unit

Min Max

Power supply voltage VCC VCC terminal 7V

Output current IOOUT terminal 35 mA

Output peak current IOP Duty ≤5%(t =1/fOSC×Duty) 700 mA

Power dissipation PDTa ≤+25 °C490* mW

Storage temperature TSTG −55 +125 °C

Parameter Symbol Condition Value Unit

Min Typ Max

Power supply voltage VCC VCC terminal 1.8 6V

Input voltage VINE −INE terminal 0 VCC −0.9 V

SCPOD terminal output voltage VSCPOD SCPOD terminal 0 6V

SCPOD terminal output current ISCPOT SCPOD terminal 0 2mA

Output current IOOUT terminal −30 +30 mA

Oscillation frequency fosc 100 500 1000 kHz

Timing resistor RTRT terminal 3.3 7.5 33 kΩ

Short-circuit detection capacitor CSCP CSCP terminal 0.22 1.0 µF

Operating ambient temperature Ta −30 +25 +85 °C

MB39A105

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■ELECTRICAL CHARACTERISTICS (VCC =3.3 V, Ta =+25 °C)

*: Standard design value.

Parameter Symbol Pin

No Conditions Value Unit

Min Typ Max

1. Under voltage

lockout

protection circuit

block [UVLO]

Threshold voltage VTLH 3VCC=1.15 1.35 1.55 V

2. Short-circuit

protection block

[SCP]

Threshold voltage VTH 20.95 1.00 1.05 V

Short-circuit detection time

setting difference voltage ∆VCSCP 20.15 0.20 0.25 V

Input source current ICSCP 2CSCP=0.85 V −1.76 −0.88 −0.44 µA

Reset voltage VRST 3VCC=1.1 1.3 1.5 V

SCPOD terminal output

leak current ILEAK 4SCPOD=3.3 V 01.0µA

SCPOD terminal output on

resistor RON 4SCPOD=1 mA 50 100 Ω

3. Triangular

wave oscillator

block [OSC]

Oscillation frequency fosc 5 RT =7.5 kΩ450 500 550 kHz

Frequency temperature

variation ∆fOSC/

fOSC 5Ta=0 °C to +85 °C1* %

4.Soft-startblock

[CS] Charge current ICS 2CSCP=0 V −16 −11 −6µA

5. Error amplifier

block [Error Amp]

Threshold voltage VTH 1FB=0.5 V 0.495 0.5 0.505 V

Input bias current IB1−INE =0 V −120 −30 nA

Voltage gain AV8DC 70* dB

Frequency band width BW 8 AV=0 dB 1.1* MHz

Output voltage VOH 81.17 1.27 1.37 V

VOL 840 200 mV

Output source current ISOURCE 8FB=0.5 V −80 −50 µA

Output sink current ISINK 8FB=0.5 V 100 300 µA

6. PWM compar-

ator block

[PWM Comp.] Maximum duty cycle Dtr 5 RT =7.5 kΩ85 90 95 %

7.Output block

[Drive]

Output source current ISOURCE 5OUT =0 V,

Duty ≤5%

(t =1/fosc×Duty) −400* mA

Output sink current ISINK 5OUT =3.3 V,

Duty ≤5%

(t =1/fosc×Duty) 400* mA

Output ON resistor ROH 5OUT=−15 mA 4.0* Ω

ROL 5OUT=15 mA 3.0 6.0 Ω

8. General block Standby current ICCS 3RT=OPEN 010µA

Power supply current ICC 3RT=7.5 kΩ1.2 1.8 mA

MB39A105

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■TYPICAL CHARACTERISTICS

(Continued)

Power supply current ICC (mA)

Power Supply Current vs. Power Supply Voltage Power Supply Current vs. RT Terminal Current

Power supply voltage VCC (V) RT terminal current IRT (µA)

Error Amplifier Threshold

Voltage VTH (V)

Power supply voltage VCC (V)

Error Amplifier Threshold Voltage vs.

Power Supply Voltage

Error Amplifier Threshold

Voltage VTH (V)

Error Amplifier Threshold Voltage vs.

Ambient Temperature

Ambient temperature Ta (°C)

Triangular Wave Oscillation

Frequency fOSC (kHz)

Ta =+25 °C

RT =7.5 kΩ

00246810

5.0

4.5

4.0

3.5

3.0

2.5

2.0

1.5

1.0

0.5

0.0 0 1020304050

Ta =+25 °C

VCC =3.3 V

ICC

Ta =+25 °C

VCC =3.3 V

1.0

0.9

0.8

0.7

0.6

0.5

0.4

0.3

0.2

0.1

0.0 0246810

VCC =3.3 V

RT =7.5 kΩ

0.52

0.51

0.50

0.49

0.48−40 −20 0 20 40 60 80 100

Ta =+25 °C

RT =7.5 kΩ

600

550

500

450

400 1234567

Triangular Wave Oscillation Frequency vs.

Power supply voltage

Power supply voltage VCC (V)

MB39A105

(Continued)

Triangular Wave Oscillation Frequency

vs. Timing Resistor

Triangular wave oscillation

frequency fOSC (kHz)

Timing resistor RT(kΩ)

Triangular Wave Oscillation Frequency

vs. Ambient Temperature

Triangular wave oscillation

frequency fOSC (kHz)

Ambient temperature Ta (°C)

Error Amplifier Gain and Phase

vs. Frequency

Frequency f (Hz)

Max On Duty (%)

Max On Duty vs.

Triangular Wave Oscillation Frequency

Triangular wave oscillation frequency fOSC (kHz)

Ta =+25 °C

VCC =3.3 V

10000

1000

100

10 1 10 100

VCC =3.3 V

RT =7.5 kΩ

600

550

500

450

400−40 −20 0 20 40 60 80 100

Ta =+25 °C

VCC =3.3 V

100

7010 100 1000 10000

−

+ 10

11 9

IN OUT

Error Amp

1 µF

1.24 V

10 kΩ

2.4 kΩ

240 kΩ

10 kΩ

−10

−20

−30

−40

180

−90

−180

100 1 k 10 k 100 k 1 M 10 M

Ta =+25 °C

VCC =3.3 V

Phase φ(deg)

Gain AV(dB)

MB39A105

(Continued)

600

500

400

300

200

100

490

−40 −20 0 20 40 60 80 100

Power Dissipation vs. Ambient Temperature

Power dissipation PD(mW)

Ambient temperature Ta ( °C)

MB39A105

■

■■

■FUNCTIONS

1. DC/DC Converter Functions

(1) Triangular-wave oscillator block (OSC)

The triangular wave oscillator incorporates a timing resistor connected to RT terminal (pin 7) to generate

triangular oscillation waveform amplitude of 0.3 V to 0.7 V.

The triangular waveforms are input to the PWM comparator in the IC.

(2) Error amplifier block (Error Amp1, Error Amp2)

The error amplifier detects the DC/DC converter output voltage and outputs PWM control signals. In addition,

an arbitrary loop gain can be set by connecting a feedback resistor and capacitor from the output terminal to

inverted input terminal of the error amplifier, enabling stable phase compensation to the system.

Also, it is possible to prevent rush current at power supply start-up by connecting a soft-start capacitor with the

CSCP terminal (pin 2) which is the non-inverted input terminal for Error Amp. The use of Error Amp for soft-start

detection makes it possible for a system to operate on a fixed soft-start time that is independent of the output

load on the DC/DC converter.

(3) PWM comparator block (PWM Comp.)

ThePWMcomparatoris a voltage-to-pulsewidth modulator that controls the output duty depending on the input/

output voltage.

The comparator keeps output transistor on while the error amplifier output voltage and the DTC voltage remain

higher than the triangular wave voltage.

(4) Output block (Drive)

The output block is in the totem pole configuration, capable of driving an external N-channel MOS FET.

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