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®
Analog and Microcontroller
Products
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will continue to offer these products to new and existing customers.
Continuity of Specifications
There is no change to this document as a result of offering the device as a Spansion product. Any changes that
have been made are the result of normal document improvements and are noted in the document revision
summary, where supported. Future routine revisions will occur when appropriate, and changes will be noted in a
revision summary.
Continuity of Ordering Part Numbers
Spansion continues to support existing part numbers beginning with “MB”. To order these products, please use
only the Ordering Part Numbers listed in this document.
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microcontroller products and solutions.
FUJITSU SEMICONDUCTOR
DATA SHEET
DS04-27269-3E
ASSP for Power Management Applications
1ch DC/DC Buck converter IC with
synchronous rectification
MB39A130A
■
DESCRIPTION
MB39A130A is a 1ch DC/DC Buck converter equipped with a bottom detection comparator and N-ch/N-ch syn-
chronous rectification. It supports low on-duty operation to allow stable output of low voltages when there is a
large difference between input and output voltages. MB39A130A realizes ultra-rapid response and high efficiency
with built-in enhanced protection features.
■
FEATURES
•
•
•
•
•
•
•
•
•
•
•
•
•
•
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•
Power conversion efficiency
: 96% (Max.)
Adjustable frequency setting by an external resistor : 100 kHz to 600 kHz
High accuracy reference voltage
:
±1.0%
Output voltage setting range
: 0.7 V to 5 V or fixed to 1.2 V/2.5 V
Adjustable output voltages setting by the external control
Input voltage range (V
IN
)
: 4.5 V to 25 V
Inductor saturation detection function which can be set optional
Built-in over voltage protection function
Built-in under voltage protection function
Built-in over current protection function
Built-in Power-Good detection function
Built-in over temperature protection function
Built-in soft-start circuit without load dependence
Built-in discharge control circuit
Built-in synchronous rectification type output driver for N-ch MOS FET
Standby current
: 0 [μA] (Typ.)
Small package
: TSSOP-24 (4.4
×
6.5 [mm])
■
APPLICATIONS
•
•
•
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Digital TV
Photocopiers
STB
BD, DVD players/recorders
Projectors
Various other advanced devices
Copyright©2009-2010 FUJITSU SEMICONDUCTOR LIMITED All rights reserved
2010.12
MB39A130A
■
PIN ASSIGNMENT
(TOP VIEW)
GND : 1
REFIN : 2
VREF : 3
CS : 4
COVP : 5
CUVP : 6
TSSOP-24
24 : FB
23 : VO
22 : RT
21 : CB
20 : OUT-1
19 : LX
18 : VBIN
17 : VCC
16 : VB
15 : OUT-2
14 : PGND
13 : FSW
(FPT-24P-M09)
PGOOD : 7
CTL : 8
LSAT : 9
ILIM : 10
+INC : 11
−INC
: 12
2
DS04-27269-3E
MB39A130A
■
PIN DESCRIPTIONS
Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
Pin Name
GND
REFIN
VREF
CS
COVP
CUVP
PGOOD
CTL
LSAT
ILIM
+INC
−INC
FSW
PGND
OUT-2
VB
VCC
VBIN
LX
OUT-1
CB
RT
VO
FB
I/O
⎯
I
O
I
⎯
⎯
O
I
I
I
I
I
I
⎯
O
O
⎯
I
⎯
O
⎯
⎯
I
I
Ground pin.
Reference voltage input pin for Error Comp.
Reference voltage output pin.
Soft-start time setting capacitor connection pin.
Detection time setting capacitor connection pin for OVP function.
The OVP function can be disabled by a short circuit with GND pin.
Detection time setting capacitor connection pin for UVP function.
The UVP function can be disabled by a short circuit with GND pin.
Power-Good detection circuit output pin. (Open-drain output)
Power supply control pin.
IC changes to standby state when CTL is set to “L” level.
Inductor oversaturation detection level setting voltage input pin.
Over current detection level setting voltage input pin.
Current detection block (Current Sense) input pin.
Current detection block (Current Sense) input pin.
Preset value switching pin for operating frequency.
Ground pin for output circuit.
Output pin for external low-side FET gate drive.
Bias output pin for output circuit.
Power supply pin.
Bias voltage external input pin for output circuit and control circuit.
Inductor and external high-side FET source and external low-side FET
drain connection pin.
Output pin for external high-side FET gate drive.
Connection pin for boot strap capacitor.
It connects a capacitor between CB and LX pins.
Connection pin for t
ON
time setting resistor.
Input pin for DC/DC output voltage.
Feedback pin for DC/DC output voltage.
Description
DS04-27269-3E
3
MB39A130A
■
BLOCK DIAGRAM
RT
22
13
FSW
17
VCC
VBIN
<Discharge >
CTL uvp otp
VB Reg.
<Soft-Start >
VREF
5
μA
CTL,
uvlo
4
18
VB
16
(5 V)
t
ON
Generator
ON/OFF
(4.5 V)
CB
21
CS
VO
23
OUT-1
<Error Comp.>
VO
REFIN
Control
Drive Logic
19
Drv-1
20
LX
OUT-2
Drv-2
15
FB
24
2
REFIN
+INC
-INC
LSAT
9
11
12
INTREF
14
PGND
Current
Sense
<LSAT Comp.>
9:1
10
μA
<ILIM Comp.>
ILIM
10
9:1
5
VB
H:UVLO
release
5
μA
<UVLO>
VB
UVLO
VREF
UVLO
COVP
<OVP Comp.>
S Q
VB
5
μA
<UVP Comp.>
R
PGOOD
7
INTREF x 1.15 V
CUVP
6
S Q
R
INTREF x 0.7 V
bias
INTREF x 0.9 V
<PGOOD Comp.>
VCC
ON/OFF
<REF><CTL>
8
CTL
(2.5 V)
3
1
VREF
GND
4
DS04-27269-3E
