FUJITSU MICROELECTRONICS
DATA SHEET
DS04-27245-2E
ASSP for Power Management Applications
1 ch DC/DC Converter IC Built-in Switching FET &
POWERGOOD function, PFM/PWM Synchronous
Rectification, and Down Conversion Support
MB39C006A
■
DESCRIPTION
The MB39C006A is a current mode type 1-channel DC/DC converter IC built-in switching FET, synchronous
rectification, and down conversion support. The device is integrated with a switching FET, oscillator, error amplifier,
PFM/PWM control circuit, reference voltage source, and POWERGOOD circuit.
External inductor and decoupling capacitor are needed only for the external component.
MB39C006A is small, achieve a highly effective DC/DC converter in the full load range, this is suitable as the
built-in power supply for handheld equipment such as mobile phone/PDA, DVDs, and HDDs.
■
FEATURES
•
•
•
•
•
•
•
•
•
•
•
•
•
•
High efficiency
: 96% (Max)
Low current consumption
: 30
μA
(at PFM)
Output current (DC/DC)
: 800 mA (Max)
Input voltage range
: 2.5 V to 5.5 V
Operating frequency
: 2.0/3.2 MHz (Typ)
Built-in PWM operation fixed function
No flyback diode needed
Low dropout operation
: For 100% on duty
Built-in high-precision reference voltage generator : 1.20 V
±
2%
Consumption current in shutdown mode
: 1
μA
or less
Built-in switching FET
: P-ch MOS 0.3
Ω
(Typ) N-ch MOS 0.2
Ω
(Typ)
High speed for input and load transient response in the current mode
Over temperature protection
Packaged in a compact package
: SON10
■
APPLICATIONS
•
•
•
•
•
•
Flash ROMs
MP3 players
Electronic dictionary devices
Surveillance cameras
Portable GPS navigators
Mobile phones
etc.
Copyright©2008-2009 FUJITSU MICROELECTRONICS LIMITED All rights reserved
2009.8
MB39C006A
■
PIN ASSIGNMENT
(Top View)
VDD
OUT
MODE
VREFIN
FSEL
10
9
8
7
6
1
2
3
4
5
LX
GND
CTL
VREF
POWERGOOD
(LCC-10P-M04)
■
PIN DESCRIPTIONS
Pin No
1
2
3
4
5
6
7
8
9
10
Pin name
LX
GND
CTL
VREF
POWERGOOD
FSEL
VREFIN
MODE
OUT
VDD
I/O
O
⎯
I
O
O
I
I
I
I
⎯
Ground pin.
Control input pin. (L : Shut down / H : Normal operation)
Reference voltage output pin.
POWERGOOD circuit output pin. Internally connected to an N-ch MOS open
drain circuit.
Frequency switch pin.
(L (open) : 2.0 MHz, H : 3.2 MHz)
Error amplifier (Error Amp) non-inverted input pin.
Operation mode switch pin.
(L : PFM/PWM mode, OPEN : PWM mode)
Output voltage feedback pin.
Power supply pin.
Description
Inductor connection output pin. High impedance during shut down.
2
DS04-27245-2E
MB39C006A
■
I/O PIN EQUIVALENT CIRCUIT DIAGRAM
VDD
VDD
∗
LX
VREF
∗
GND
GND
VDD
∗
∗
VREFIN
∗
∗
OUT
GND
VDD
VDD
∗
CTL
∗
FSEL
∗
GND
GND
VDD
POWER
*
MODE
GOOD
∗
GND
*
GND
* : ESD Protection device
DS04-27245-2E
3
MB39C006A
■
BLOCK DIAGRAM
V
IN
VDD
10
CTL
3
ON/OFF
OUT
9
×3
−
+
Error Amp
VDD
5
POWERGOOD
POWER-
GOOD
I
OUT
Comparator
VREF
4
1.20 V
V
REF
PFM/PWM
Logic
VREFIN
DAC
7
Control
1
LX
V
OUT
Lo : PFM/PWM
OPEN : PWM
MODE
8
Mode
Control
6
FSEL
2
GND
4
DS04-27245-2E
MB39C006A
•
Current mode
• Original voltage mode type:
Stabilize the output voltage by comparing two items below and on-duty control.
- Voltage (V
C
) obtained through negative feedback of the output voltage by Error Amp
- Reference triangular wave (V
TRI
)
• Current mode type:
Instead of the triangular wave (V
TRI
), the voltage (V
IDET
) obtained through I-V conversion of the sum of currents
that flow in the oscillator (rectangular wave generation circuit) and SW FET is used.
Stabilize the output voltage by comparing two items below and on-duty control.
- Voltage (V
C
) obtained through negative feedback of the output voltage by Error Amp
- Voltage (V
IDET
) obtained through I-V conversion of the sum of current that flow in the oscillator (rectangular
wave generation circuit) and SW FET
Voltage mode type model
V
IN
Current mode type model
V
IN
Oscillator
Vc
V
TRI
Vc
V
IDET
S
R
Q
SR-FF
Vc
V
TRI
V
IDET
Vc
ton
toff
toff
ton
Note : The above models illustrate the general operation and an actual operation will be preferred in the IC.
DS04-27245-2E
5
京公网安备 11010802033920号
EEWORLD
