Datasheet FA3630V Datasheet (CALLM)

FA3630V

FA3630V

CMOS IC

For Switching Power Supply Control

■ Description

FA3630V is a DC-DC converter controller.
This IC can directly drive a 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

• 2-channels PWM control: Rail-to-rail output
Output impedance of output stage = 3.5Ω (typ.)
Nch-MOSFET driving (Ch1)
Nch/Pch-MOSFET driving (Ch2)(selected by SEL pin)

• Low power consumption: 0.7mA (typ.)

• ON/OFFcontrol: Standby current= 0.1µA (typ.)

• ±2% high accuracy reference voltage

• Adjustable soft start time and maximum duty cycle

• Adjustable built-in timer latch for short circuit protection

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

• Package: TSSOP-16 (Thin and small)

■ Applications

• Power supply for general equipment

■ Block diagram

■ 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

Pin Pin Description
No. symbol

1 ON/OFF ON/OFF function
2 IN2+

3 IN2– Ch.2 inverting input to error
4 FB2 Ch. 2 output of error amplifier

5 SEL Selection of type of MOSFET
6 GND Ground

7 CS2 Soft start for Ch. 2
8 OUT2 Ch. 2 output (for Nch or Pch-

9 OUT1 Ch.1 outout (for Nch-MOSFET)
10 CS1 Soft start for Ch.1
11 VCC Power supply
12 VREG Regulated voltage output
13 FB1 Ch.1 output of error amplifier
14 IN1– Ch.1 inverting input to error

15 CP Timing capacitor for timer latch
16 CT Oscillator timing capacitor

Ch. 2 non-inverting input to error
amplifier

amplifier

drived

MOSFET)

amplifier

delay

1

FA3630V

■ Absolute maximum ratings

Item Symbol Rating Unit

Power supply voltage VCC 6.5 V
Source peak current of OUT1/2
Sink peak current of OUT1/2
Input voltage for logic input VLOG –0.3 to +6.5 V
Output current of VREG IREGMAX –10 mA
Total power dissipation* Pd 300 mW
Junction temperature TJ 125 °C
Ambient temperature TOP –20 to +85 °C
Storage temperature Tstg –40 to +125 °C

Ta ⬉ 25°C

*

IOUT+ –500 mA
IOUT– 500 mA

■ Recommended operating conditions

Item Symbol Min. Max. Unit

Power supply voltage VCC 2.5 5.5 V
Input voltage for logic input VLOG 0 5.5 V
Oscillation frequency fOSC 100 1000 kHz

■ Electrical characteristics (VCC=3.3V, Ta=25°C, CT=100pF)
Regulated voltage section for internal control blocks

Item Symbol Test condition Min. Typ. Max. Unit

Regulated voltage VREG IREG=no load 2.156 2.200 2.244 V
Variation with output current VRGOUT VREG=0 to 5mV 5 mV
Variation with supply voltage VRGLIN VCC=2.5 to 5.5V 8 mV
Variation with temperature VRGTa Ta=–20 to +25°C ±0.5 %

Ta=+25 to +85°C ±0.5 %

Reference voltage section

Item Symbol Test condition Min. Typ. Max. Unit

Reference voltage VREF 0.98 1.00 1.02 V
Variation with supply voltage VRGLIN VCC=2.5 to 5.5V 1 5 mV
Variation with temperature VRGTa Ta=–20 to +25°C ±0.5 %

Ta=+25 to +85°C ±0.5 %

Oscillator section

Item Symbol Test condition Min. Typ. Max. Unit

Oscillation frequency fOSC CT=100pF 437 485 533 kHz
High level voltage VOSCH CT=100pF 1.39 V
Low level voltage VOSCL CT=100pF 0.77 V
Variation with supply voltage fdV VCC=2.5 to 5.5V ±1 ±5%
Variation with temperature fdT Ta=–20 to +25°C ±5%

Ta=+25 to +85°C ±5%

Error amplifier section

Item Symbol Test condition Min. Typ. Max. Unit

Input offset voltage VIOF 310mV
Common mode input voltage VICOM 0.2 1.5 V
DC open loop gain AVOL 70 75 dB
Unity gain band width fT 1.6 MHz
Output sink current IFBL VFB=0.5V 2.0 2.5 3.0 mA
Output source current IFBH VFB=VREG–0.5V –160 –125 –90 µA

2

FA3630V

ON/OFF logic input signal section

Item Symbol Test condition Min. Typ. Max. Unit

Input range for ON mode VONH VCC=2.5V to 5.5V 2.0 V
Input range for OFF mode VONL VCC=2.5V to 5.5V 0.5 V

SEL logic input signal section

Item Symbol Test condition Min. Typ. Max. Unit

Input range for driving Nch-MOSFET VSELH Vcc–0.5 V
Input range for driving Pch-MOSFET VSELL 0.5 V

Timer latch protection section

Item Symbol Test condition Min. Typ. Max. Unit

Threshold voltage of CP VCPTH 1.55 1.70 1.85 V
Charge current of CP ICP VCP=VREG–0.5V –2.5 –2.1 –1.7 µA
Threshold voltage of FB1/FB2 VFBTL 1.56 1.73 1.90 V

Soft-start section

Item Symbol Test condition Min. Typ. Max. Unit

Threshold voltage of CS1/2 VCS 0 Duty cycle=0% 0.74 0.79 0.84 V
Threshold voltage of CS1/2 VCS 100 Duty cycle=100% 1.29 1.34 1.39 V

Output section

Item Symbol Test condition Min. Typ. Max. Unit

ON resistance OUT1 ( High / Low ) RON IOUT=±100mA 3.5 7 Ω

OUT2 ( High / Low ) VCC=3.3V 3.5 7 Ω

Rise time OUT1 tr CLOAD=1000pF 25 35 ns

OUT2 VCC=3.3V 25 35 ns

Fall time OUT1 tf CLOAD=1000pF 25 35 ns

OUT2 VCC=3.3V 25 35 ns

Overall device

Item Symbol Test condition Min. Typ. Max. Unit

Standby current ICC0 ON/OFF=GND 0.1 5 µA
Operating average current ICC OUT1, OUT2: Open 0.7 1 mA

Output duty=100%

(Reference value)

OUT1, OUT2: Open 1.5 mA
IN– and FB: Shorted

3

FA3630V

]

■ Characteristic curves (Ta=25°C)

Supply current (ICC) vs. supply voltage (VCC) Oscillation frequency (fOSC) vs. timing capactior(CT)

1.1
1

0.9

0.8

0.7

0.6

ICC [mA]

0.5

0.4

0.3

0.2

0.1
0

0

123456

VCC [V]

Output duty cycle vs. FB terminal voltage (VFB) Output duty cycle vs. CS terminal voltage (VCS)

10000

1000

fosc [kHZ]

100

10

10

100

500

1000

CT [pF]

100

90
80
70
60

50
40
30

Output duty cycle [%]

20
10

0

0

0.5

1 1.5 2

VFB [V]

100

90
80
70

60
50

40
30

Output duty cycle [%]

20
10

0

0

0.5

1 1.5 2

VCS [V]

Oscillation frequency (fOSC) vs. ambient temperature (Ta) Reference voltage (VREF) vs. ambient temperature (Ta)

500

490

480

Vcc=3.3V

T=100pF

C

1.01

1.005

470

fOSC [kHZ]

460

450

440

– 30

– 10

10 30 50 70 90

Ta [°C

VREF [V]

0.995

0.99

1

– 30

– 10

10 30 50 70 90

Ta[°C]

4

FA3630V

L-level output voltage (VOL1) vs. output sink current (Isink1)

2.4

2.2
2

1.8

1.6

VOL1 [V]

1.4

1.2

0.8

0.6

0.4

0.2

1

0

0

50

100 150

200

V

CC=3.3V

250 300

ISINK 1 [mA]

L-level output voltage (VOL2) vs. output sink current (Isink2)

2.4

2.2

2

1.8

1.6

VOL2 [V]

1.4

1.2

0.8

0.6

0.4

0.2

1

0

0

50

100 150

ISINK 2 [mA]

200

V

CC

=3.3V

250 300

H-level output voltage (V

2.4

2.2
2

1.8

1.6

1.4

1.2
1

VCC– VOH1 [V]

0.8

0.6

0.4

0.2
0

0

50

OH1

100 150

ISOURCE 1 [mA]

H-level output voltage (V

2.4

2.2
2

1.8

1.6

1.4

1.2
1

VCC– VOH2 [V]

0.8

0.6

0.4

0.2
0

0

50

OH2

100 150

ISOURCE 2 [mA]

) vs. output source current (I

VCC=3.3V

200

250 300

) vs. output source current (I

VCC=3.3V

200

250 300

SOURCE1

SOURCE2

)

)

Error amplifier voltage gain (Av) / phase (θ) vs. frequency (f)

Condition: Open loop

180
160
140
120

[deg]

Av [dB]

100

– 20
– 40

80
60

40
20

0

100

1K 10K

Phase

Voltage gain

100K

1M 10M

ƒ [HZ]

5

■ Application circuit

FA3630V

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.

6