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BD9862MUV 데이터시트 PDF




ROHM Semiconductor에서 제조한 전자 부품 BD9862MUV은 전자 산업 및 응용 분야에서
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부품번호 BD9862MUV 기능
기능 5V Input Multi-channel System Power Supply IC
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BD9862MUV 데이터시트, 핀배열, 회로
Power Supply IC Series for TFT-LCD Panels
5V Input Multi-channel
System Power Supply IC
BD9862MUV
No.10035EAT16
Description
The BD9862MUV is a 3ch system power supply for mobile TFT liquid crystal panels.Operable at VBAT=1.8V, CH2 & CH3
adopts the original PWM/PFM automatic switching control charge pump and realizes high efficiency in full-load range.
Features
1) Input voltage range: 1.8V~4.5V (The input voltage can be 5.5V if a double charge pump is not used)
2) The step-up switching regulator has a built-in output FET (CH1)
3) There is a built-in PWM/PFM automatic switching charge pump circuit with a fixed PWM terminal (CH2,3)
4) Switching regulator oscillation frequency: MHz(typ.)
5) Charge pump oscillation frequency: 500kHz(typ.)
6) There is a built-in circuit to discontinue output (timer latch type) in the event of overload
7) Package VQFN024V4040
Applications
Small & medium TFT liquid crystal displays etc.
Absolute Maximum Ratings (Ta = 25°C)
Parameter
Maximum adding power supply voltage
Maximum adding voltage
Symbol
VBAT
LX
FB1, INV1, INV2, UVLOSET, C2N,
VIN2A, CN, CP, CPOUT, REGOUT,
PWM, RT ,VREF ,NON3
VIN3, C3P, Vo2, C2P, VIN2B
Power dissipation
Pd
Operating temperature range
Topr
Storage Temperature Range
Tstg
Junction temperature
Tjmax
(*1) When used as a stand-alone IC (for Ta=25and over), the value is reduced by 27mW/.
(*2) When used for Printed Circuit Boards (glass epoxy board of 74.2mm×74.2mm×1.6mm) mounting
for Ta=25and over, the value is reduced by 5.6mW/.
Ratings
-0.3 ~ 7
-0.3 ~ 18
-0.3~7
-0.3~15.5
0.34(*1)
0.70(*2)
-40 ~ +85
-55 ~ +150
+150
Unit
V
V
W
Operating Conditions(Ta=25)
Parameter
Symbol
Ratings
MIN TYP
Power Supply Voltage
VBAT
1.8
-
CH1Output Voltage
Vo1 - -
CH2 Output Voltage
Vo2 - -
CH3 Output Voltage
Starting capacity, adding charge pump
flying capacitor
Reversing capacity charge pump
flying capacitor
Starting charge pump Output capacitance
Vo3
Cflys,Cflya
Cflyi
CCPOUT
-15
0.1
0.022
1.0
-
0.22
0.047
2.0
Switching regulator oscillation frequency
fOSC1
700
1.0
Charge pump oscillation frequency
fOSC2 350 500
CH1 PowerNMOS Drain current
Iidn1 - -
(1) When using a double charge pump for starting. 5.5V when not using a double charge pump
MAX
4.5(1)
15
15
-
-
-
-
1.4
700
1.0
Unit condition
V
V
V
V
µF
µF
µF
MHz
kHz
A
CCPOUTCfly*10
RRT=82k~180k
RRT=82k~180k
www.rohm.com
© 2010 ROHM Co., Ltd. All rights reserved.
1/16
2010.03 - Rev.A




BD9862MUV pdf, 반도체, 판매, 대치품
BD9862MUV
Reference Data(Unless specified Ta=25,VCC=2.5V,RRT=120k)
Technical Note
90
85
80
75
70
65
60
55
50
45
40
1
L=15uH
L=4.7uH
10
Load current[mA]
100
Fig.1 CH1Current Load to Efficiency
(Vo1=10V)
90
PWM/PFM MODE
85
80
75 PWM MODE
70
65
0.1
1
Load current[mA]
10
Fig.2 CH2 Current Load to Efficiency
(VIN2A=3.5V,VIN2B=10V,Vo2=12V)
50
PWM/PFM MODE
48
46
44
PWM MODE
42
40
38
36
0.1
1
Load current[mA]
10
Fig.3 CH3 Current Load to Efficiency
(VIN3=10V,Vo3=-5V)
3.6
3.59
3.58
3.57
3.56
3.55
0
5 10
Load current[mA]
15
Fig.4 REGOUT
Output Load Regulation
3.520
3.515
3.510
3.505
3.500
3.6
4.0 4.4 4.8 5.2
CPOUT voltage[V]
Fig.5 REGOUT
Output Line Regulation
3.518
3.516
3.514
3.512
3.510
3.508
3.506
3.504
-40 -15 10 35 60 85
Ta[℃]
Fig.6 REGOUT Output Voltage
Temperature Feature
1.006
1.005
1.004
1.003
1.002
-40 -15 10 35 60 85
Ta[℃]
Fig.7 INV1 Threshold Voltage
Temperature Feature
1.006
1.005
1.004
1.003
1.002
-40 -15 10 35 60 85
Ta[℃]
Fig.8 INV2 Threshold Voltage
Temperature Feature
1.012
1.011
1.010
1.009
1.008
-40 -15 10 35 60 85
Ta[℃]
Fig.8 NON3 Threshold Voltage
Temperature Feature
100
90
80
70
60
50
40
30
20
10
0
0.6 0.8
1 1.2 1.4 1.6 1.8
FB1 voltage[V]
2
Fig.10 CH1 FB1Voltage-
On Duty Feature
1015
1010
1005
1000
995
990
985
-40 -15 10 35 60 85
Ta[℃]
Fig.11 CH1 Switching Frequency
Temperature Feature
1050
1040
1030
1020
1010
1000
990
980
970
960
950
2
34
VBAT[V]
5
Fig.12 CH1 Switching Frequency
to VBAT Voltage Feature
www.rohm.com
© 2010 ROHM Co., Ltd. All rights reserved.
4/16
2010.03 - Rev.A

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BD9862MUV 전자부품, 판매, 대치품
BD9862MUV
Technical Note
System Description
BD9862MUV is a 3ch system power supply optimized for TFT liquid crystal displays.
Features of each channel are explained as follows
CH1
This is a voltage mode switching regulator with a built-in high voltage-resistant output FET. Capable of high-speed operation
at the maximum switching frequency of 1.4MHz, and compatible with a high step-up ratio with Max Duty of 90%(typ.).
CH2
It’s a PWM/PFM automatic switching control with a variable-voltage adding charge pump. Due to intermittent switching at
the time of PFM mode, the switching loss is reduced, so high efficiency is realized even in light load conditions. Moreover,
it is capable of operating at the maximum switching frequency of 700KHz because of a built-in high voltage resistant,
high-speed FET driver. In addition, it is equipped with an On Duty prediction function, so the output voltage ripple is
lowered considerably even at the time of PFM operation.Due to the built-in output discharge resistor (1ktyp.) and FET
phase compensation circuit, it can operate with two capacitors and two resistors.
CH3
It includes a PWM/PFM automatic switching control, variable-voltage reversing charge pump controller. The control
method is the same as CH2.
Block functional descriptions
Error amplifier block
Detects the output voltage with INV terminal (NON3 terminal in case of CH3), amplifies the error between it and standard
voltage, and outputs from the FB terminal. The accuracy is ±1%(1.5% in case of CH2 & CH3).
PWM(Pulse Width Modulation)Convertor block
The PWM convertor inputs the error detected by the error amplifier and outputs the PWM signal by comparing with a
saw-tooth wave.
PWM/PFM Control Block
Due to the input of the PWM terminal, this block switches the CH2 & CH3 between the fixed PWM mode and the automatic
switching mode of PFM(Pulse Frequency Modulation)/PWM. At the time of PFM mode, the efficiency under a light load is
raised by controlling and making the lowest On Duty of PWM signal to be 7%(typ.) and reducing the number of switching times.
LDO Block
This is a power supply to operate the internal circuit. In addition, it can be used as input of VIN2B. The output voltage is
3.5V(typ.), and the maximum load is 10mA. Moreover, due to a built-in UVLO, the release voltage is 2.5V(typ) and the
protective voltage is 2.4V(typ).
Start-up Charge Pump Block
If REGOUT is 2.5V(typ.), then the ring oscillator, which operates at 500kHz or so, is started and the double charge
pump is operated. The clock pulse is controlled in such a way that the output voltage of this charge pump becomes
4.2V(typ.). Moreover, if REGOUT becomes more than 2.5V(typ.) (i.e. REGOUT2.5V(typ.)), then the clock is supplied
from the main OSC that creates a saw tooth wave. If the input voltage is usually more than 4.5V, then it is possible to
bypass the start-up circuit. (refer to the application example)
OSC Block
It generates a saw-tooth wave and inputs it into the PWM comparator. It is possible to change the oscillating frequency by
means of the resistor RT. Due to RRT=120k, the CH1 operates at 1MHz(typ.). The double charge pump, CH2 and CH3
operate at 1/2 of CH1 frequency.
VREF Block
Generate the constant voltage that is standard inside the IC.
UVLO Block
Performs the under voltage lockout by detecting the VBAT voltage with the UVLOSET terminal. The UVLO voltage can be
set by an external resistor.
Soft Start Block
Due to sweep-starting of the standard voltage of the error amplifier at the time of start-up, the excess input current & output
voltage is reduced. Moreover, only at the time of soft start, the CH2 is regarded as the resistance value of 150typ
between VIN2B & C2P and the CH3 is regarded as the resistance value of 60typ between VIN3 & C3P therefore the
input current is limited.
Short-circuit protection of timer latch (SCP) block
Monitors the INV1 terminal and the error amplifier outputs of CH2 & CH3, and turns off the drivers of CH1~CH3 if a
short-circuit condition continues for more than a certain period of time. The timer latch time is counted by the CH1 internal
switching pulse. The counting is started when a short-circuit condition begins, ant the drivers are turned off when 131,072
is reached.
Example) if RRT=120k, then 131072×(1/1[MHz])=131.072ms
Thermal shutdown (TSD) block
Detects abnormal heat generation of the IC, stops the switching operation of all Ch and prevents the IC from thermal
overload. The detecting temperature is 175(typ), and the hysteresis is 10(typ).
www.rohm.com
© 2010 ROHM Co., Ltd. All rights reserved.
7/16
2010.03 - Rev.A

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부품번호상세설명 및 기능제조사
BD9862MUV

5V Input Multi-channel System Power Supply IC

ROHM Semiconductor
ROHM Semiconductor

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