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PDF MB3821 Data sheet ( Hoja de datos )
| Número de pieza | MB3821 | |
| Descripción | 2-ch DC/DC Converter IC With Synchronous Rectifier | |
| Fabricantes | Fujitsu Media Devices | |
| Logotipo |  |
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FUJITSU SEMICONDUCTOR
DATA SHEET
DS04-27221-2E
ASSP For Power Supply Applications
With Power Mode Switching Function
2-ch DC/DC Converter IC With Synchronous Rectifier
MB3821
s DESCRIPTION
The MB3821 is a pulse width modulation (PWM) type 2-channel DC/DC converter IC with synchronous rectification
designed for low voltage, high efficiency operation in high precision and high frequency applications, ideal for down
conversion.
A normal/low-power mode selection is provided, ideal for an internal power supply (3.3V, 5V) in applications with
substantial load current variation, such as notebook computers.
s FEATURES
• Synchronous rectification
• High efficiency
: 93 % (normal power mode, VIN = 6 V, load 1 A)
: 84 % (low power mode, VIN = 6 V, load 20 mA)
• Built-in power mode selector circuit
• Reference voltage accuracy : 2.5V ± 2 %
• Built-in error amp input control type soft start circuit
• Totem pole type output for N-ch MOSFET applications
• Built-in timer-latch type short protection circuit
s PACKAGE
24-pin, Plastic SSOP
(FPT-24P-M03)
1 page  
MB3821
s ABSOLUTE MAXIMUM RAGINGS
Parameter
Power supply voltage
Bias voltage
Output current
Output peak current
Power dissipation
Storage temperature
Symbol
Conditions
VCC —
VB —
Io —
Io Duty ≤ 5 %
PD Ta ≤ +25°C
Tstg —
Min.
—
—
—
—
—
−55
Rating
Max.
32
17
50
500
740*
+125
Unit
V
V
mA
mA
mW
°C
* : 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.
s RECOMMENDED OPERATING CONDITIONS
Parameter
Symbol
Conditions
Min.
Value
Typ.
Max.
Unit
Power supply voltage
VCC
—
4.5 16
30 V
Bias voltage
VB
—
—6
16 V
Reference voltage output current IOR
—
–1 —
0 mA
Input voltage
-IN pin
VIN
SEL, CTL pin
0 — VCC – 1.8 V
0—
30 V
Output current
IO OUT pin
–30 —
30 mA
Output peak current
Io Duty ≤ 5 %
–300
—
300 mA
Timing capacitance CT — 150 500 15000 pF
Timing resistance
RT
—
6.8 10
12 kΩ
Oscillator frequency
SEL = 0 V (Normal mode)
10
fOSC
SEL = 5 V (Low power mode) 1
200
20
500 kHz
50 kHz
Soft-start capacitance
CS
—
— 0.1
1.0 µF
Short detection capacitance
CSCP
—
— 0.01 1.0 µF
Boot capacitance
CB
—
— 0.1
1.0 µF
Operating ambient temperature
Ta
—
–30 +25
+85 °C
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.
5
5 Page 
MB3821
(Continued)
Triangular wave oscillator frequency
vs. ambient temperature
250
240
230
220
210
200
190
180
170
160
150
−40
VCC = 16 V
CTL = 5 V
SEL = 0 V
RT = 10 kΩ, CT = 500 pF
−20 0 20 40 60 80
Ambient temperature Ta (°C)
100
Error amplifier,gain and phase vs. frequency (ch1)
40
30
20
10
0
−10
−20
−30
−40
100
AV
φ
Ta = +25 °C 180
135
90
45
0
−45
−90
−135
−180
1 k 10 k 100 k 1 M 10 M
Frequency f (Hz)
Triangular wave oscillator frequency
vs. ambient temperature
25
24
23
22
21
20
19
18
17
16
15
−40
VCC = 16 V
CTL = 5 V
SEL = 5 V
RT = 10 kΩ, CT = 500 pF
−20 0 20 40 60 80
Ambient temperature Ta (°C)
100
2.52 V
1 µF
11 kΩ
2.4 kΩ
240 kΩ
−
11 kΩ
+
Error amplifier
1.26 V
Power dissipation vs. ambient temperature
800
740
700
600
500
400
300
200
100
0
−40 −20 0 20 40 60 80 100
Ambient temperature Ta (°C)
11
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet MB3821.PDF ] | |
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