Datasheet FA3629AV Datasheet (CALLM)

FA3629AV

CMOS IC

For Switching Power Supply Control

FA3629AV

■ Description

FA3629AV is a Power IC which includes DC-DC
converter controller and Nch-power MOSFET.
This IC can directly drive Nch/Pch MOSFET.
This IC is suitable to reduce converter size because it has
many functions in a small package TSSOP.

■ Features

• Low input voltage: 2.5V to 6.5V

• 40V CDMOS Process:
Built-in 0.3Ω Nch-Power MOSFET(ch1, open drain)

• 3-channels PWM Control:
2 boost circuits(ch1, ch2), 1 inverting circuit (ch3)

• Adjustable soft start time and maximum duty cycle

• Built-in timer latch for short circuit protection:
Delay time = 2

16

/ (switching frequency)

• Built-in protection functions: Overcurrent limit for MOSFET,
overheat protection, undervoltage lockout

• Wide range of operation frequency: 100kHz to 1MHz

• Package: TSSOP-16(Thin and small)

■ Applications

• Power supply for general equipment

■ Dimensions, mm

Á TSSOP-16

5.2

9

8

0.65

0.2

16

1

±0.05

4.4

±0.05

0.07

±0.1

6.4

–0.04

+0.02

0.17

1.1max

0~8˚

0.5

±0.08

■ Block diagram

Pin Pin Description
No. symbol

1 FB1 Ch.1 output of error amplifier
2 IN1– Ch.1 inverting input to error

amplifier

3 IN2– Ch. 2 inverting input to error

amplifier

4 GND Ground of control blocks
5 PGND Ground of large power blocks
6 FB2 Ch. 2 output of error amplifier
7 IN3– Ch. 3 inverting input to error

amplifier

8 FB3 Ch. 3 output of error amplifier
9 OUT3 Ch. 3 output (for Pch-MOSFET)
10 OUT2 Ch. 2 output (for Nch-MOSFET)
11 VCC Power supply
12 OUT1 Ch.1 drain output of internal

Nch-MOSFET

13 REG Regulated voltage output
14 CT Oscillator timing capacitor
15 CS3 Soft start for Ch. 3
16 CS Soft start for Ch.1 and Ch. 2

1

FA3629AV

■ Absolute maximum ratings

Item Symbol Rating Unit

Power supply voltage VCC 6.5 V
Output voltage at OUT1 pin
Output current at OUT1 pin*
Source peak current of OUT2
Sink peak current of OUT2 IOUT2- 400 mA
Source peak current of OUT3
Sink peak current of OUT3 IOUT3- 400 mA
Source average current of OUT2
Sink average current of OUT2
Source average current of OUT3
Sink

average current of

Input voltage to err. amp. VEI 5.0 V
Total power dissipation*
Ambient temperature TOPR –25 to +95 °C
Junction temperature TJ 125 °C
Storage temperature TSTG –40 to +125 °C

1 Output current is limited by the overcurrent protection

*

2 Ta < 25°C

*

VOUT1 40 V

1

IOUT1 2.8 A
IOUT2+ –400 mA

IOUT3+ –400 mA

IOUT2+ –50 mA
IOUT2-50 mA
IOUT3+ –50 mA

OUT3

IOUT3-50 mA

2

Pd 500 mW

■ Electrical characteristics (VCC=3.0V, Ta=25°C)
Reference voltage section

■ Recommended operating conditions

Item Symbol Min. Max. Unit

Power supply voltage VCC 2.5 5.8 V
Output voltage of OUT1 VOUT1 032 V
Output current of OUT1 IOUT1 0 1.8 A
Oscillation frequency fOSC 100 1000 kHz
Ambient temperature TOPR –20 85 °C

Item Symbol Test condition Min. Typ. Max. Unit

Reference voltage VREF 0.98 1.00 1.02 V
Variation with supply voltage VREF-LINE VCC=2.5 to 5.8V 1 3 mV
Variation with temperature VREF-TC1 Ta=–20 to +25°C 0.5 1.2 %

VREF-TC2 Ta=+25 to +85°C 0.5 1.2 %

Regulated voltage for internal control blocks

Item Symbol Test condition Min. Typ. Max. Unit

Regulated voltage VREG CO=0.1µF 2.16 2.20 2.24 V
Variation with supply voltage VREG-LINE VCC=2.5 to 5.8V 3 8 mV
Variation with temperature VREG-TC1 Ta=–20 to +25°C 0.5 1.5 %

VREG-TC2 Ta=+25 to +85°C 0.7 1.5 %

Source current IREG –40 –15 mA

Oscillator section

Item Symbol Test condition Min. Typ. Max. Unit

Oscillation frequency fOSC CT=150pF 480 550 620 kHz
High level voltage VOSCH CT=150pF 1.38 V
Low level voltage VOSCL CT=150pF 0.78 V
Variation with supply voltage fdv VCC=2.5 to 5.8V 1 2 %
Variation with temperature fdT1 Ta=–20 to +25°C 57%

fdT2 Ta=+25 to +85°C 57%

2

FA3629AV

Soft-start and duty section

Item Symbol Test condition Min. Typ. Max. Unit

Charge current of CS (Source) ICS –1.2 –1.0 –0.8 µA
Charge current of CS3 (Sink) ICS3 0.8 1.0 1.2 µA
Max. duty cycle of OUT1 & OUT2 Dmax fOSC=500kHz 80 87 90 %
Max. duty cycle of OUT3 Dmax3 fOSC=500kHz 80 86 90 %
Invalid TL threshold voltage of CS VCSLO 0.42 0.52 0.62 V
Invalid TL threshold voltage of CS3 VCSHI 1.58 1.68 1.78 V

Timer latch section (TL)

Item Symbol Test condition Min. Typ. Max. Unit

Threshold voltage of FB1 (Ch.1) VTLTH1 1.58 1.68 1.78 V
Threshold voltage of FB2 (Ch. 2) VTLTH2 1.58 1.68 1.78 V
Threshold voltage of FB3 (Ch. 3) VTLTH3 0.42 0.52 0.62 V
Start up count count – 2
Start up time TTL CT=150pF 105 119 137 ms

Error amplifier section

Item Symbol Test condition Min. Typ. Max. Unit

Input offset voltage VIO 10 mV
Common mode input voltage range VCOM 0.2 1.5 V
DC open loop gain AVO 70 75 80 dB
Unity gain band width fT 1.0 1.7 2.0 MHz
Sink current (Ch.1) IOL1 VFB1=0.5V 1.0 1.5 2.0 mA
Source current (Ch.1) IOH1 VFB1=VREG –0.5V –160 –120 –80 µA
Sink current (Ch. 2) IOL2 VFB2=0.5V 0.5 0.7 0.9 mA
Source current (Ch. 2) IOH2 VFB2=VREG –0.5V –160 –120 –80 µA
Sink current (Ch. 3) IOL3 VFB3=0.5V 1.0 1.5 2.0 mA
Source current (Ch. 3) IOH3 VFB3=VREG –0.5V –160 –120 –80 µA
Sink current variation with temperature IOL-TC1 Ta=–20 to +25°C20%

IOL-TC2 Ta=+25 to +85°C20%

Source current variation with temperature IOH-TC1 Ta=–20 to +25°C20%

IOH-TC2 Ta=+25 to +85°C20%

16

– counts

Overcurrent protection section (OCP)

Item Symbol Test condition Min. Typ. Max. Unit

Threshold current IOCDTH VCC=3.0V 1.4 1.8 2.0 A

VCC=5.0V 1.8 2.0 2.2 A

Delay time fOCD 100 200 400 ns

Overheat protection section (OHP)

Item Symbol Test condition Min. Typ. Max. Unit

Threshold temperature TOH 125 135 145 °C

Undervoltage lockout circuit section (UVLO)

Item Symbol Test condition Min. Typ. Max. Unit

Threshold voltage of REG VUVTH 1.95 2.05 2.15 V

3

FA3629AV

Output section (OUT1)

Item Symbol Test condition Min. Typ. Max. Unit

On resistance of MOSFET RON1 VCC=3.0V, IO1=200mA 0.25 0.275 0.3 Ω
Rise time of OUT1 tr VCC=3.0V 25 35 ns
Fall time of OUT1 tf VOUT1=10V, IO1=1.0A 25 35 ns

Output section (OUT2, OUT3)

Item Symbol Test condition Min. Typ. Max. Unit

Rise time of OUT2 tr2 VCC=3V, CO2=1000pF 20 25 35 ns
Fall time of OUT2 tf2 (Between OUT2-GND) 20 25 35 ns
Rise time of OUT3 tr3 VCC=3V, CO3=1000pF 20 25 35 ns
Fall time of OUT3 tf3 (Between VCC-OUT3) 20 25 35 ns
High level on resistance of OUT2 R2AH VCC=3V, IOUT2=–150mA 2.5 4.0 5.5 Ω
Low level on resistance of OUT2 R2AL VCC=3V, IOUT2=150mA 2.5 4.0 5.5 Ω
High level on resistance of OUT3 R3AH VCC=3V, IOUT3=–150mA 2.5 4.0 5.5 Ω
Low level on resistance of OUT3 R3AL VCC=3V, IOUT3=150mA 2.5 4.0 5.5 Ω
High level on resistance of OUT2 R2AH VCC=5V, IOUT2=–150mA 2.0 3.5 5.0 Ω
Low level on resistance of OUT2 R2AL VCC=5V, IOUT2=150mA 2.0 3.5 5.0 Ω
High level on resistance of OUT3 R3AH VCC=5V, IOUT3=–150mA 2.0 3.5 5.0 Ω
Low level on resistance of OUT3 R3AL VCC=5V, IOUT3=150mA 2.0 3.5 5.0 Ω

Overall device

Item Symbol Test condition Min. Typ. Max. Unit

Operating current (Overall) ICCA D=50%, fOSC=500kHz 3.0 3.8 mA
Operating current of control blocks ICTRL 1.8 mA

4

FA3629AV

AV [dB]

Phase [deg]

f [HZ]

100

1K 10K

100K

1M

10M

0

0

30

60

90

120

180

150

10

20

30

40

50

60

70

80

90

100

– 30

– 30

– 60

– 20

– 10

Av

Phase

■ Characteristic curves (Ta=25°C)

Supply current (ICC) vs oscillation frequency (fOSC) Oscillation frequency (fOSC) vs. timing capactior(CT)

VCC=6.0V

6

4

ICC [mA]

2

0

200k

500k

fosc [kHZ]

CC=3.0V

V

VCC=2.5V

V

CC=5.0V

800k

1000

fosc [kHZ]

100

100

1000

CT [pF]

Oscillation frequency (f

700

650

600

550

) vs. ambient temperature (Ta) Max. on duty cycle vs. oscillation frequency (f

OSC

100

90

fosc [kHz]

500

80

Maximum on duty cycle [%]

450

400

25

0

25 50 75

100

Ta [°C]

70

100 1000

500

fosc [kHz]

Oscillation peak voltage vs. timing capactior(CT) Error amplifier voltage gain (Av) /phase vs.

frequency (f)

Condition: Open loop

2

CH.1, 2

CH. 3

OSC

)

Maximum peak voltage

1

Voltage [V]

0

100

CT [pF]

Minimum peak voltage

500

1000

5

FA3629AV

]

Output (Ch. 2) duty cycle vs FB terminal voltage (VFB) Output (Ch. 3) duty cycle vs. FB3 terminal voltage (VFB3)

100

90

80

70

60
50

40

30

Output (CH. 2) duty cycle [%]

20
10

0

0.5 0.7 0.9 1.1 1.3

fOSC=150kHZ
fOSC=550kHZ

FB [V

fOSC=800kHZ

1.5

100

90
80

fOSC=800kHZ

70

60
50
40

30

Output (CH. 3) duty cycle [%]

20
10

0

0.5 0.7 0.9 1.1 1.3

fOSC=150kHZ

fOSC=550kHZ

FB3 [V]

1.5

H-level output voltage (VOH) vs output source current (ISO) L-level output voltage (VOL) vs. output sink current (ISI)

OUT2, OUT3 OUT2, OUT3

4.0

4.0

VCC– VOH [V]

2.0

VCC=5.0V

CC=3.0V

V

VOL [V]

2.0

CC=3.0V

V

VCC=5.0V

0

– 400

– 200

0

ISO [mA]

0

0

200

400

ISI [mA]

6

■ Application circuit

FA3629AV

Parts tolerances characteristics are not defined in the circuit design
sample shown above. When designing an actual circuit for a product,
you must determine parts tolerances and characteristics for safe and
economical operation.

7