FUJITSU MB3874, MB3876 DATA SHEET

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FUJITSU SEMICONDUCTOR

DATA SHEET

ASSP

For Po wer Supply Applications (Lithium ion battery charger)

DS04-27704-2E

DC/DC Con verter IC f or Parallel Char ging

MB3874/MB3876

DESCRIPTION

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The MB3874 and MB3876 are parallel charging DC/DC converter ICs suitable f or do wn-con version, which uses pulse width modulation (PWM) for controlling the output voltage and current independently.

These ICs can dynamically control the secondary batter y’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, f or example, with the A C 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.

FEATURES

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• Detecting a voltage drop in the AC adapter and dynamically controlling the charge current (Dynamically-controlled charging)

• High efficiency : 93 %(In rev erse-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 %

(Continued)

PACKAGE

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24-pin plastic SSOP

(FPT-24P-M03)

MB3874/MB3876

(Continued)

• Support for frequency setting using an external resistor (Frequency setting capacitor integrated) :100 kHz to 500 kHz

• Built-in current detector amplifier with wide in-phase input voltage range : 0 V to V

• Built-in standby current function : 0 µA (Typ.)

• Built-in soft start function

• Capable of parallel charging (Charging the two battery packs at a time)

• Internal totem-pole output stage supporting P-channel MOS FETs devices

PIN ASSIGNMENT

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−INC1 :

FB2 :

−INE2 :

+INE2 :

MB3874/MB3876

(TOP VIEW)

: +INC1

: GND

: CS

: V

VREF :

CTL :

FB1 :

−INE1 :

+INE3 :

−INE3 :

FB3 :

−INC2 :

: OUT

: VH

: OUTM

: RT

: −INE4

: FB4

: −INE5

: +INC2

(FPT-24P-M03)

MB3874/MB3876

PIN DESCRIPTION

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Pin No. Symbol I/O Descriptions

1 –INC1 I Output voltage feedback input pin. 2 FB2 O Error amplifier (Error Amp. 2) output pin. 3 –INE2 I Error amplifier (Error Amp. 2) inverted input pin.

4+INE2 I 5 VREF O Reference voltage output pin. 6CTL I 7 FB1 O Error amplifier (Error Amp. 1) output pin. 8–INE1 I

9+INE3 I

10 –INE3 I Error amplifier (Error Amp. 3) inverted input pin. 11 FB3 O Error amplifier (Error Amp. 3) output pin. 12 –INC2 I Output voltage feedback input pin. 13 +INC2 I Current detection amplifier (Current Amp. 2) input pin . 14 –INE5 I Error amplifier (Error Amp. 5) inverted input pin. 15 FB4 O Error amplifier (Error Amp. 4, 5) output pin. 16 –INE4 I Error amplifier (Error Amp. 4) inverted input pin. 17 RT — Triangular-wave oscillation frequency setting resistor connection pin.

18 OUTM O

Error amplifier (Error Amp. 2) non-inverted input pin. Input pin for charge current setting voltage

Power supply control pin. Setting the CTL pin low places the IC in the standby mode.

Error amplifier (Error Amp. 1) inverted input pin Input pin for dynamically-controlled charging voltage setting

Error amplifier (Error Amp. 3) non-inverted input pin. Input pin for charge current setting voltage

Output pin for dynamically controlled charging identification signal “H” level: Constant-voltage or constant-current charging mode

“L” level: Dynamically controlled charging mode 19 VH O Power supply pin for FET drive circuit (VH = Vcc − 5 V). 20 OUT O High-side FET gate drive pin. 21 V 22 CS — Soft-start capacitor connection pin. 23 GND — Ground pin. 24 +INC1 I Current detection amplifier (Current Amp. 1) input pin .

CC — Power supply pin for reference power supply and control circuit.

BLOCK DIAGRAM

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MB3874/MB3876

−INE1

FB1

−INE2 +INC1

−INC1

+INE2

FB2

−INE3 +INC2

−INC2

+INE3

FB3

−INE4

−INE5

FB4

7 3

4 2

13 12

∗

R2 50 kΩ

<SOFT>

VREF

+ × 25

−

+ × 25

−

∗

R2 50 kΩ

1 µA

208 kΩ

100 kΩ

− +

42 kΩ

− +

− +

− + +

− + +

VREF

(4.2 V)

VREF

+ + + +

−

Bias voltage block

− +

2.5 V

<OUT>

<VH>

<UVLO>

UVLO)

215 kΩ

−

0.91 V

(0.77 V)

VREF ULVO

Drive

(VCC − 5 V)

35 kΩ

OUTM

OUT

2.5 V

1.5 V

(45 pF)

bias

<OSC>

17 5 23

VREF

∗

CTL

GND

MB3874 100 kΩ MB3876 150 kΩ

MB3874/MB3876

ABSOLUTE MAXIMUM RATINGS

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Parameter Symbol Conditions

Unit

Min. Max.

Rating

Power supply voltage V Output terminal current I Peak output current I OUTM terminal output voltage V Power dissipation P

CC ——28V OUT ——60mA OUT Duty ≤ 5% (t =1 / fOSC × Duty) — 500 mA OUTM ——17V

D Ta ≤ +25°C — 740* mW

Storage temperature Tstg — –55 +125 °C

*: The package is mounted on the dual-sided 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.

RECOMMENDED OPERATING CONDITIONS

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Value

Parameter Symbol Conditions

Unit

Min. Typ. Max.

Power supply voltage V Reference voltage output

current

CC —7—25V

REF —–1—0mA

VH pin output current IVH —0—30mA

-INC –INC1, –INC2 0 — 17 V

Input voltage

CTL pin input voltage V Output current I Peak output current I OUTM pin output voltage V OUTM pin output current I Oscillator frequency f Timing resistor R Soft-start capacitor C VH pin capacitor C Reference voltage output

capacitor

INE –INE1 to –INE5, +INE2 0 — VCC – 1.8 V

+INC +INC1, +INC2 0 — VCC V

CTL —0—25V OUT OUT pin –45 — 45 mA OUT Duty ≤ 5% (t =1 / fOSC × Duty) –450 — 450 mA

OUTM ——315V

OUTM ———1mA

OSC — 100 290 500 kHz

T — 33 47 130 kΩ S — — 2200 100000 pF

VH ——0.11.0µF

REF ——0.11.0µF

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.

ELECTRICAL CHARACTERISTICS

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Parameter

Symbol

Pin No. Conditions

MB3874/MB3876

(MB3874 : Ta = +25°C, VCC = 16 V, VREF = 0 mA) (MB3876 : Ta = +25°C, V

Value

Min. Typ. Max.

CC = 19 V, VREF = 0 mA)

Unit Remarks

Output voltage V

Input stability Line 5 V Load stability Load 5 VREF = 0 mA to –1 mA — 1 10 mV

block (Ref)

Short-circuit

Reference voltage

output current

Threshold voltage

Hysteresis width V

Under voltage

Threshold

lockout protection

voltage

circuit block (UVLO)

Hysteresis width V

REF 5

Ta = –30°C to +85°C 4.158 4.200 4.242 V

Ta = +25°C 4.167 4.200 4.233 V

CC = 7 V to 25 V — 3 10 mV

OS 5 VREF = 1 V –25 –15 –5 mA

TLH

CC = 6.3 6.6 6.9 V

THL VCC = 5.3 5.6 5.9 V

H 21 — 0.7 1.0 1.3 V

TLH

VREF = 2.6 2.8 3.0 V

THL VREF= 2.4 2.6 2.8 V

H 5 — 0.05 0.20 0.35 V

Charge current ICS 22 — –1.3 –0.8 –0.5 µA

block

(SOFT)

Soft-start

Oscillation frequency

Frequency tem-

block (OSC)

oscillator circuit

perature stability

Triangular waveform

*: Standard design value.

OSC

∆f/fdt

RT = 47 kΩ 260 290 320 kHz

Ta = –30°C to +85°C — 1* — %

(Continued)

MB3874/MB3876

(Continued)

Parameter Symbol Pin No Conditions

(MB3874 : Ta = +25°C, VCC = 16 V, VREF = 0 mA) (MB3876 : Ta = +25°C, V

CC = 19 V, VREF = 0 mA)

Value

Unit Remarks

Min. Typ. Max.

Threshold voltage

Input pin current IIN Voltage gain A Frequency

bandwidth

(Error Amp.1)

Output voltage

Error amplifier block

Output source current

Output sink current

Input offset voltage

Input pin current

Common mode input voltage range

FB1 = 2 V, –INE1 = 2.35 V

TH 21

FB1 = 2 V, –INE1 = 2.83 V

–INE1= 0 V –100 –30 — nA

V 7 DC — 100* — dB

14.00 14.20 14.40 V

16.80 17.10 17.40 V

MB3874

MB3876

BW 7 AV = 0 dB — 2.0* — MHz

FBH 7—3.94.1—V

VFBL 7 — — 20 200 mV

SOURCE 7 FB1 = 2 V — –2.0 –0.6 mA

SINK 7 FB1 = 2 V 150 300 — µA

VIO

INE 4,9 +INE2 = +INE3 = 0 V –100 –30 — nA

3,4

9,10

3,4

9,10

FB2 = FB3 = 2 V — 1* — mV

—0—VCC–1.8 V

Voltage gain A Frequency

bandwidth

(Error Amp.2, 3)

Error amplifier block

Output voltage

Output source current

Output sink current

*: Standard design value.

V 2, 11 DC — 100* — dB

BW 2, 11 A

V = 0 dB — 2.0* — MHz

VFBH 2, 11 — 3.9 4.1 — V

FBL 2, 11 — — 20 200 mV

SOURCE 2, 11 FB2 = FB3 = 2 V — –2.0 –0.6 mA

ISINK 2, 11 FB2 = FB3 = 2 V 150 300 — µA

(Continued)

Parameter Symbol Pin No Conditions

Threshold voltage

Input current

Input resistor

(Current Amp.4, 5)

Error amplifier block

Voltage gain A Frequency

bandwidth

MB3874/MB3876

(MB3874 : Ta = +25°C, VCC = 16 V, VREF = 0 mA) (MB3876 : Ta = +25°C, V

Value

Min. Typ. Max.

12.500 12.600 12.700 V

16.666 16.800 16.934 V

12.474 12.600 12.726 V

16.632 16.800 16.968 V

TH 1, 12

FB4 = 2 V, Ta = +25 °C

FB1 = 2 V, Ta = –30 °C to +85 °C

–INC1 = –INC2 = 12.6 V — 84 150 µA

INEH 1, 12

–INC1 = –INC2 = 16.8 V — 84 150 µA V

CC = 0 V,

–INC1 = –INC2 = 12.6 V

—0 1µA

IINEL 1, 12

VCC = 0 V, –INC1 = –INC2 = 16.8 V

—0 1µA 70 100 130 kΩ

1 1, 12 —

105 150 195 kΩ

R2 14, 16 — 355065kΩ

V 15 DC — 100* — dB

BW 15 AV = 0 dB — 2.0* — MHz

CC = 19 V, VREF = 0 mA)

Unit Remarks

MB3874 MB3876 MB3874 MB3876 MB3874 MB3876

MB3874

MB3876

MB3874 MB3876

Output voltage

Output source current

Output sink current

*: Standard design value.

FBH 15 — 3.9 4.1 — V

FBL 15 — — 20 200 mV

SOURCE 15 FB4 = 2 V — –2.0 –0.6 mA

ISINK 15 FB4 = 2 V 150 300 — µA

(Continued)

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