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PDF MB3874 Data sheet ( Hoja de datos )
| Número de pieza | MB3874 | |
| Descripción | DC/DC Converter IC for Parallel Charging | |
| Fabricantes | Fujitsu Media Devices | |
| Logotipo |  |
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FUJITSU SEMICONDUCTOR
DATA SHEET
DS04-27704-2E
ASSP For Power Supply Applications (Lithium ion battery charger)
DC/DC Converter IC for Parallel Charging
MB3874/MB3876
s DESCRIPTION
The MB3874 and MB3876 are parallel charging DC/DC converter ICs suitable for down-conversion, which uses
pulse width modulation (PWM) for controlling the output voltage and current independently.
These ICs can dynamically control the secondary battery’s charge current by detecting a voltage drop in an AC
adapter in order to keep its power constant (dynamically-controlled charging).
The charging method enables quick charging, for example, with the AC adapter during operation of a notebook PC.
The IC also enable parallel charging, or charging two batteries at the same time, dramatically reducing the charging
time.
With an on-chip output voltage setting resistor which allows the output voltage to be set at high precision, these
ICs are best suited as internal battery chargers for notebook PCs.
The MB3874 support 3-cell battery and the MB3876 support 4-cell battery.
s FEATURES
• Detecting a voltage drop in the AC adapter and dynamically controlling the charge current (Dynamically-con-
trolled charging)
• High efficiency
: 93 %(In reverse-current preventive diode)
• Wide range of operating supply voltages
: 7 V to 25 V
• Output voltage precision
(Built-in output voltage setting resistor )
: ± 0.8 % (Ta = + 25 °C)
• High precision reference voltage source
: 4.2 V ± 0.8 %
s PACKAGE
(Continued)
24-pin plastic SSOP
(FPT-24P-M03)
1 page  
MB3874/MB3876
s BLOCK DIAGRAM
−INE1
8
FB1
7
−INE2
3
+INC1
24
−INC1
1
+INE2
4
FB2
2
−INE3
10
+INC2
13
−INC2
12
+INE3
9
<Error Amp.1> VREF
−
208 kΩ
VCC +
42 kΩ
<Current Amp.1>
+ 100 kΩ
× 25
−
<Error
Amp.2>
VREF
−
+
<Current Amp.2>
+ 100 kΩ
× 25
−
<Error
Amp.3>
VREF
−
+
FB3
11
−INE4
16
R1
∗
R2
50 kΩ
−INE5
14
R1
∗
R2
50 kΩ
<Error
Amp.4>
VREF
−
+
+
<Error
Amp.5>
VREF
−
+
+
FB4
15
<SOFT>
VREF
1 µA
VREF
(4.2 V)
<MASK Comp.>
−
+
2.5 V
OUTM
18
VCC
<PWM
Comp.>
++++−
<OUT>
Drive
VCC
21
OUT
20
VCC
Bias voltage
VH
19
block
<VH> (VCC − 5 V)
<UVLO>
VCC
(VCC UVLO) 215 kΩ
+
− 35 kΩ
0.91 V
(0.77 V)
VREF
ULVO
CS
22
2.5 V
1.5 V
<OSC>
(45 pF)
bias
<Ref>
<CTL>
CTL
6
17 5 23
RT VREF
GND
∗ : MB3874 100 kΩ
MB3876 150 kΩ
5
5 Page 
MB3874/MB3876
(Continued)
(MB3874 : Ta = +25°C, VCC = 16 V, VREF = 0 mA)
(MB3876 : Ta = +25°C, VCC = 19 V, VREF = 0 mA)
Parameter
Symbol Pin No.
Conditions
Value
Unit Remarks
Min. Typ. Max.
Output source
current
ISOURCE
OUT = 11 V,
Duty ≤ 5 %
(t = 1/fosc × Duty )
20
OUT = 14 V,
Duty ≤ 5 %
(t = 1/fosc × Duty )
— –200* — mA MB3874
— –200* — mA MB3876
Output sink current ISINK
OUT = 16 V,
Duty ≤ 5 %
(t = 1/fosc × Duty )
20
OUT = 19 V,
Duty ≤ 5 %
(t = 1/fosc × Duty )
— 200* — mA MB3874
— 200* — mA MB3876
ROH
Output ON resistor
ROL
20 OUT = −45 mA
20 OUT = 45 mA
— 8.0 16.0 Ω
— 6.5 13.0 Ω
Rise time
tr1 20 OUT = 3300 pF
(Equivalent to Si4435DY)
— 70* — ns
Fall time
tf1 20 OUT = 3300 pF
(Equivalent to Si4435DY)
— 60* — ns
CTL input voltage
VON
VOFF
6 Active mode
6 Standby mode
2.0 — 25.0 V
0 — 0.8 V
Input current
ICTLH
ICTLL
6 CTL = 5 V
6 CTL = 0 V
— 100 200 µA
—0
1 µA
Output voltage
VH
19
VCC = 7 V to 25 V,
VH = 0 to 30 mA
Standby current ICCS 21 CTL = 0 V
Power supply
current
ICC 21 CTL = 5 V
*: Standard design value
VCC – VCC – VCC –
5.5 5.0 4.5
V
— 0 10 µA
— 6.0 9.0 mA MB3874
— 6.5 9.5 mA MB3876
11
11 Page | ||
| Páginas | Total 28 Páginas | |
| PDF Descargar | [ Datasheet MB3874.PDF ] | |
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