FUJITSU SEMICONDUCTOR
DATA SHEET
DS04-27201-3E
ASSP
For Power Supply Applications
Switching Regulator Controller
MB3776A
s
DESCRIPTION
MB3776A is a PWM system switching regulator controller. Because of its low operating supply voltage and power-
down, the MB3776A is ideal for use in DC/DC converters for battery-powered portable equipment.
s
FEATURES
•
•
•
•
•
•
Wide supply voltage range: (2 V to 15 V)
Wide oscillation frequency range, high-frequency oscillation: (10 kHz to 500 kHz)
Push-pull output. Drive current set with external resistor
Bulit-in idle period circuit
Internally set error amplifier gain, few external components
Bulit-in power-down function
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PACKAGES
8-pin Plastic DIP
8-pin Plastic SOP
8-pin Plastic SOL
8-pin Plastic SSOP
(DIP-8P-M01)
(FPT-8P-M01)
(FPT-8P-M02)
(FPT-8P-M03)
MB3776A
s
PIN ASSIGNMENT
(TOP VIEW)
–IN
1
8
FB
CLT
2
7
OSC
V
CC
3
6
GND
I
B
4
5
OUT
(DIP-8P-M01)
(FPT-8P-M01)
(FPT-8P-M02)
(FPT-8P-M03)
2
MB3776A
s
BLOCK DIAGRAM
V
CC
3
OSC
7
I
S
0.6 V
I
B
CTL
2
Reference
voltage
1.25 V
Internal bias &
reference voltage
Error Amp.
0.1 V
Saw–tooth
waveform
0.1 V
P. W. M. Comp
I
s
30 kΩ
5
OUT
–IN
1
–
X 100
36 kΩ
–
+
470
Ω
0.5 V
+
+
Output drive
control
4
I
B
D. T. C. ( 0.6 V)
FB
8
6
GND
3
MB3776A
s
ABSOLUTE MAXIMUM RATINGS
(Ta = +25°C)
Parameter
Power supply voltage
Error amp. input voltage
Output source current
Output sink current
Symbol
V
CC
V
I
I
SOURCE
I
SINK
Condition
—
—
—
—
Ta
≤
+25°C (DIP)
Power dissipation
P
D
Ta
≤
+25°C (SOP)
EIAJ
JEDEC
Rating
Min.
—
–0.3
—
—
—
—
—
—
–30
–55
Max.
16
+10
–50
50
550
*570
*430
*580
+75
+125
Unit
V
V
mA
mA
mW
mW
mW
mW
°C
°C
Ta
<
+25°C (SSOP)
Operating temperature
Storage temperature
Top
Tstg
—
—
* : The packages are mounted on the epoxy board (10 cm
×
10 cm
×
1.5 mm)
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.
s
RECOMMENDED OPERATING CONDITIONS
Parameter
Power supply voltage
Error amp. input voltage
Output source current
Output sink current
Phase compensation capacitor
Timing capacitor
Timing resistor
Oscillator frequency
Operating temperature
Symbol
V
CC
V
I
I
SOURCE
I
SINK
C
P
C
T
R
T
f
OSC
T
OP
Value
Min.
2.0
–0.2
–40
—
—
100
1.0
10
–30
Typ.
—
—
—
—
0.1
1000
3.0
200
25
Max.
15
1.0
—
40
—
10000
5.0
500
75
Unit
V
V
mA
mA
µF
pF
kΩ
kHz
°C
WARNING: Recommended operating conditions are normal operating ranges for the semiconductor device. All
the device’s electrical characteristics are warranted when operated within these ranges.
Always use semiconductor devices within the recommended operating conditions. 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 representative beforehand.
4
MB3776A
s
ELECTRICAL CHARACTERISTICS
1. Reference Section and Error Amp. Section
(Ta = +25°C, V
CC
= 3 V)
Parameter
Input threshold voltage
V
T
input stability
V
T
temp. stability
Input bias current
Voltage gain
Frequency band width
Symbol
V
T
V
TdV1
V
TdV2
V
TdT
I
B
A
V
BW
A
V
= 0 dB
Condition
Min.
V
FB
= 450 mV
V
CC
= 2.0 V to 6.0 V
V
CC
= 6.0 V to 15 V
Ta = –30°C to +75°C
V
IN
= 0 V to 0.6 V
—
487
–5
–5
–3
–1.0
70
—
Value
Typ. Max.
507
—
—
—
–0.2
100
6
527
5
5
3
1.0
145
—
Unit
mV
mV
mV
%
µA
V/V
MHz
2. Saw-tooth Waveform Oscillator Section
(Ta = +25°C, V
CC
= 3 V)
Parameter
Oscillator frequency
Frequency input stability
Frequency temp. stability
Symbol
f
OSC
f
dV
f
dT
Condition
R
T
= 3.0 kΩ
C
T
= 1000 pF
V
CC
= 2.0 V to 15 V
Ta = –30°C to +75°C
Value
Min.
160
—
—
Typ. Max.
200
±2
±10
240
—
—
Unit
kHz
%
%
3. Under Lockout Protection
(Ta = +25°C, V
CC
= 3 V)
Parameter
Threshold voltage
Symbol
V
TH
Condition
—
Value
Min.
—
Typ. Max.
1.4
—
Unit
V
4. Dead-time Control Section
(Ta = +25°C, V
CC
= 3 V)
Parameter
Symbol
Condition
C
T
= 1000 pF
R
T
= 3.0kΩ
V
FB
= 0.9 V
Value
Min.
60
Typ. Max.
70
85
Unit
Max. duty cycle
t
DUTY
%
5
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