The following document contains information on Cypress products.
FUJITSU MICROELECTRONICS
DATA SHEET
DS04-27248-1Ea
ASSP for Power Supply Applications (Secondary battery)
DC/DC Converter IC for Charging
Li-ion Battery
MB39A125/126
■
DESCRIPTION
MB39A125/126 is a DC/DC converter IC for charging Li-ion battery, which is suitable for down-conversion, and
uses pulse width modulation (PWM) for controlling the output voltage and current independently. This IC integrates
the build-in comparator for the voltage detection of the AC adapter, and selects the AC adapter or battery auto-
matically for power supply to the system.
Provides a wide range of power supply voltage, low standby current, and high efficiency, which makes them ideal
as a built-in charging device in products such as notebook PC.
■
FEATURES
•
•
•
•
High efficiency : 97% (MAX)
Built-in two constant current control circuits
Analog control of the charging current value (+INE1,
+INE2
terminal)
Built-in AC adapter voltage detection function (ACOK, XACOK terminal)
(Continued)
■
PACKAGES
24-pin plastic SSOP
28-pin plastic QFN
(FPT-24P-M03)
(LCC-28P-M11)
Copyright©2005-2008 FUJITSU MICROELECTRONICS LIMITED All rights reserved
2005.11
MB39A125/126
(Continued)
• External output voltage setting resistor : MB39A125
• Built-in output voltage setting resistor : MB39A126
• Built-in charge stop function at low VCC
• Output voltage setting accuracy :
±
0.74% (Ta
= −10 °C
to
+85 °C)
: MB39A125
: 12.6 V/16.8 V
±
0.8% (Ta
= −10 °C
to
+85 °C)
: MB39A126
• Built-in high accuracy current detection amplifier (±5%) (At input voltage difference 100 mV) ,
(±15%) (At input voltage difference 20 mV)
• In IC standby mode (Icc
=
0
µA
Typ) , make output voltage setting resistor open to prevent inefficient current loss
• Built-in soft-start circuit
• Standby current : 0
µA
(Typ)
• Totem-pole type output for Pch MOS FET
2
MB39A125/126
■
PIN ASSIGNMENTS
•
MB39A125
(TOP VIEW)
−INC2
OUTC2
+INE2
−INE2
ACOK
1
24
+INC2
GND
2
23
3
22
CS
4
21
VCC
5
20
OUT
VREF
6
19
VH
ACIN
−INE1
+INE1
OUTC1
7
18
XACOK
8
17
RT
−INE3
FB123
9
16
10
15
OUTD
−INC1
11
14
CTL
+INC1
12
13
(FPT-24P-M03)
(Continued)
3
MB39A125/126
(Continued)
(TOP VIEW)
XACOK
−INE3
22
21
VCC
OUT
VH
CS
28
27
26
25
24
23
N.C.
1
RT
FB123
GND
+INC2
N.C.
−INC2
OUTC2
+INE2
2
20
CTL
+INC1
N.C.
−INC1
OUTD
3
19
4
18
5
17
6
7
16
15
N.C.
8
9
10
11
12
13
14
ACOK
VREF
−INE2
ACIN
−INE1
+INE1
(LCC-28P-M11)
Note : Connect IC’s radiation board at bottom side to potential of GND.
4
OUTC1
京公网安备 11010802033920号
EEWORLD
