R1201N051A-TR-FE [RICOH]
Switching Regulator, 1A, 1200kHz Switching Freq-Max, CMOS, PDSO6, ANTIMONY AND HALOGEN FREE, SOT-23, 6 PIN;
| 型号： | R1201N051A-TR-FE |
| 厂家： | 
RICOH ELECTRONICS DEVICES DIVISION |
| 描述： | Switching Regulator, 1A, 1200kHz Switching Freq-Max, CMOS, PDSO6, ANTIMONY AND HALOGEN FREE, SOT-23, 6 PIN 开关 光电二极管 |
| 文件： | 总17页 (文件大小：362K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
R1201x SERIES
STEP-UP DC/DC CONVERTER FOR WHITE LED BACK LIGHT
NO.EA-207-130509
OUTLINE
The R1201x Series are PWM control type step-up DC/DC converter ICs with low supply current.
The R1201x is fully dedicated to drive White LEDs with constant current. Each of these ICs consists of an
NMOS FET, a forward diode, an oscillator, a PWM comparator, a voltage reference unit, an error amplifier, a
current limit circuit, an under voltage lockout circuit (UVLO), and an over-voltage protection circuit (OVP).
The R1201x can drive white LEDs in constant current with high efficiency by using an inductor, a resistor and
capacitors as external components. A diode is built-in; therefore it is possible to drive up to 5 serial white LEDs
without an external diode.
The LEDs current can be set by an external resistance value and can adjust the dimming of LEDs by CE pin
according to the signal of PWM. Feedback voltage is 0.2V, therefore power loss by current setting resistance is
small and efficiency is good. Maximum duty cycle is internally fixed, Typ. 91%. LEDs can be driven from low
voltage. Protection circuits are the current limit of Lx peak current, the over voltage limit of output, and the under
voltage lockout function. The oscillator frequency can be selected from 1MHz or 1.2MHz.
It is controllable the dimming of LEDs quickly when the PWM signal (between 200Hz to 300kHz) input to CE
pin. If the CE pin input is "L" in the fixed time (Typ. 0.5ms), the IC becomes the standby mode and turns OFF
LEDs.
FEATURES
• Supply Current...........................................................Typ. 450μA (R1201xxx3A/4A)
Typ. 500μA (R1201xxx1A/2A)
• Standby Current.........................................................Max. 5μA
• Input Voltage Range ..................................................1.8V to 5.5V
• Feedback Voltage ......................................................0.2V
• Feedback Voltage Accuracy.......................................±10mV
• Temperature-Drift Coefficient of Feedback Voltage...±150ppm/°C
• Oscillator Frequency..................................................Typ. 1MHz, Typ. 1.2MHz
• Maximum Duty Cycle.................................................Typ. 91%
• Switch ON Resistance ...............................................Typ. 1.35Ω
• UVLO Detector Threshold..........................................Typ. 1.6V
• Lx Current Limit Protection ........................................Typ. 700mA
• OVP Detector Threshold............................................Select from 9.5V, 14.0V, 18.5V, 20.6V, 21.6V
• Switching Control.......................................................PWM
• LED dimming control..................................................by external PWM signal (Frequency 200Hz to 300kHz)
• Packages ...................................................................DFN1616-6 (Non-promotion), SOT-23-6
• Ceramic capacitors are recommended......................0.22μF (R1201x02xA/ 03xA/ 04xA)
1μF (R1201x05xA)
APPLICATION
• White LED Backlight for portable equipment
1
R1201x
BLOCK DIAGRAMS
V
FB
V
IN
L
X
V
OUT
Error Amp
UVLO
PWM Comp.
Switch
Control
R
Q
OVP
S
Vref
PWM
Control
OSC
Slope
Compensation
Current
Protect
Current
sense
EN
Σ
Shutdown
delay
Chip Enable
CE
GND
SELECTION GUIDE
The OVP threshold voltage, and the package for the ICs can be selected at the user's request.
Product Name
R1201LxxxA-TR
Package
Quantity per Reel
5,000 pcs
Pb Free
Yes
Halogen Free
DFN1616-6
(Non-promotion)
Yes
Yes
R1201NxxxA-TR-FE
SOT-23-6
3,000 pcs
Yes
xxx : Designation of OVP detector threshold
(021) 9.5V threshold of OVP, Frequency 1.2MHz
(031) 14.0V threshold of OVP, Frequency 1.2MHz
(041) 18.5V threshold of OVP, Frequency 1.2MHz
(051) 20.6V threshold of OVP, Frequency 1.2MHz
(052) 21.6V threshold of OVP, Frequency 1.2MHz
(023) 9.5V threshold of OVP, Frequency 1MHz
(033) 14.0V threshold of OVP, Frequency 1MHz
(043) 18.5V threshold of OVP, Frequency 1MHz
(053) 20.6V threshold of OVP, Frequency 1MHz
(054) 21.6V threshold of OVP, Frequency 1MHz
∗As for R1201x052A/ 054A version, input voltage range is 1.8V to 4.5V.
The products scheduled to be discontinued : "Non-promotion"
These products will be discontinued in the future. We advise you to select other products.
2
R1201x
PIN CONFIGURATIONS
• DFN1616-6
• SOT-23-6
6
5
4
Top View
Bottom View
6
5
4
4
5
6
(mark side)
∗
1
2
3
3
2
1
1
2
3
PIN DESCRIPTIONS
• DFN1616-6 (Non-promotion)
Pin No
Symbol
Pin Description
1
2
3
4
5
6
CE
Chip Enable Pin ("H" Active)
Feedback Pin
VFB
Lx
Switching Pin (Open Drain Output)
Ground Pin
GND
VIN
Input Pin
VOUT
Output Pin
∗) Tab is GND level. (They are connected to the reverse side of this IC.)
The tab is better to be connected to the GND, but leaving it open is also acceptable.
• SOT-23-6
Pin No
Symbol
CE
Pin Description
Chip Enable Pin ("H" Active)
1
2
3
4
5
6
VOUT
VIN
Output Pin
Input Pin
Lx
Switching Pin (Open Drain Output)
Ground Pin
GND
VFB
Feedback Pin
3
R1201x
ABSOLUTE MAXIMUM RATINGS
GND=0V
Symbol
Item
Rating
Unit
V
VIN
VIN Pin Voltage
CE Pin Voltage
VFB Pin Voltage
VOUT Pin Voltage
−0.3 to 6.5
VCE
V
−0.3 to VIN+0.3
−0.3 to VIN+0.3
−0.3 to 25.0
VFB
V
VOUT
V
VLX
ILX
LX Pin Voltage
LX Pin Current
V
−0.3 to 25.0
1000
mA
Power Dissipation (DFN1616-6) (Non-promotion)∗
640
PD
mW
Power Dissipation (SOT-23-6)∗
Operating Temperature Range
Storage Temperature Range
420
Topt
Tstg
−40 to 85
−55 to 125
°C
°C
∗) For Power Dissipation, please refer to PACKAGE INFORMATION.
ABSOLUTE MAXIMUM RATINGS
Electronic and mechanical stress momentarily exceeded absolute maximum ratings may cause the
permanent damages and may degrade the life time and safety for both device and system using the device
in the field. The functional operation at or over these absolute maximum ratings is not assured.
4
R1201x
ELECTRICAL CHARACTERISTICS
• R1201x
Topt=25°C
Symbol
Item
Conditions
R1201xxx1A, R1201xxx3A
R1201x052A, R1201x054A
Min.
1.8
Typ.
Max. Unit
5.5
V
4.5
VIN
Operating Input Voltage
1.8
R1201xxx1A/2A
R1201xxx3A/4A
0.5
0.45
1.0
1.0
mA
V
V
IN
=
=
Input voltage Max,
0V, Lx at no load
IDD
Supply Current
FB
0.9
Istandby Standby Current
5.0
1.7
VIN=Input voltage Max, VCE=0V
μA
VUVLO1 UVLO Detector Threshold VIN falling
1.5
1.5
1.6
V
VUVLO1
+0.1
VUVLO2 UVLO Released Voltage VIN rising
1.8
V
VCEH
VCEL
RCE
VFB
CE Input Voltage "H"
CE Input Voltage "L"
CE Pull Down Resistance
VFB Voltage Accuracy
V
V
VIN=Input voltage Max
VIN=1.8V
0.5
600
1200
0.20
2200
0.21
VIN=3.6V
kΩ
V
0.19
VIN=VCE=3.6V
ΔVFB/ VFB Voltage Temperature
ΔTopt
ppm
/°C
VIN=VCE=3.6V, −40°C ≤ Topt ≤ 85°C
±150
Coefficient
IFB
VFB Input Current
0.1
VIN=Input voltage Max, VFB=0V or VIN
VIN=3.6V, ILX=100mA
VLX=24V
−0.1
μA
Ω
RON
Switch ON Resistance
Switch Leakage Current
Switch Current Limit
Diode Forward Voltage
1.35
0
ILXleak
ILXlim
Vf
3.0
μA
mA
V
400
700
0.8
1000
VIN=3.6V
IDIODE=100mA
IDIODEleak Diode Leakage Current
fosc Oscillator Frequency
Maxduty Maximum Duty Cycle
10
1.4
VOUT=24V, VLX=0V
μA
R1201xxx1A/2A
R1201xxx3A/4A
1.0
0.83
86
1.2
1.0
VIN=3.6V,
VOUT=VFB=0V
MHz
%
1.17
91
VIN=3.6V, VOUT=VFB=0V
R1201x021A/023A
8.9
9.5
10.1
14.6
19.1
21.2
22.2
R1201x031A/033A
R1201x041A/043A
R1201x051A/053A
R1201x052A/054A
13.4
17.9
20.0
21.0
14.0
18.5
20.6
21.6
VIN=3.6V,
VOUT rising
VOVP1
OVP Detector Threshold
V
ΔVOVP1/ VOVP1 Voltage
ΔTopt
ppm
/°C
VIN=VCE=3.6V, −40°C ≤ Topt ≤ 85°C
±150
Temperature Coefficient
5
R1201x
Symbol
Item
Conditions
R1201x021A/023A
Min.
Typ.
Max. Unit
VOVP1
−0.5
VOVP1
−0.75
VOVP1
−1.0
VOVP1
−1.1
VOVP1
−1.15
R1201x031A/033A
R1201x041A/043A
R1201x051A/053A
R1201x052A/054A
VIN=3.6V,
VOUT falling
VOVP2
OVP Released Voltage
V
RECOMMENDED OPERATING CONDITIONS (ELECTRICAL CHARACTERISTICS)
All of electronic equipment should be designed that the mounted semiconductor devices operate within the
recommended operating conditions. The semiconductor devices cannot operate normally over the
recommended operating conditions, even if when they are used over such conditions by momentary
electronic noise or surge. And the semiconductor devices may receive serious damage when they continue
to operate over the recommended operating conditions.
6
R1201x
TYPICAL APPLICATIONS
L1
L1
22μH
22μH
C1
1μF
C1
1μF
C2
C2
0.22μF
1.0μF
VIN
L
X
VIN
LX
CE
V
OUT
CE
VOUT
GND
VFB
GND
VFB
R1
R1
10Ω
10Ω
R1201x02xA/ 03xA/ 04xA
R1201x05xA
(External Components) C2: R1201x02xA/ 03xA/ 04xA 0.22μF
C2: R1201x05xA 1.0μF
• LED Current setting
When CE pin input is "H" (Duty=100%), LED current can be set with feedback resistor (R1)
ILED=VFB / R1
• LED Dimming Control
The LED brightness can be controlled by inputting the PWM signal to the CE pin. If the CE pin input is "L" in
the fixed time (Typ.0.5ms), the IC becomes the standby mode and turns OFF LEDs.
The current of LEDs when the CE pin is "H" input (Duty=100%) is shown by the above expression. The current
of LEDs can be controlled by Duty of the PWM signal of the input CE pin. The current of LEDs when High-Duty
of the CE input is Hduty reaches the value as calculatable following formula.
ILED=Hduty × VFB / R1
The frequency of the PWM signal is using the range between 200Hz to 300kHz.
When controlling the LED brightness by the PWM signal of 20kHz or less; The increasing or decreasing of the
inductor current might be make a sounds in the hearable sound wave area. In that case, please use the PWM
signal in the high frequency area.
CE
Hduty
VFB
R1
Dimming control by CE pin input
7
R1201x
• Soft-Start
The output of the error amplifier starts from 0V and the inrush current is suppressed when starting by the CE
pin "H" input.
Moreover, the inrush current can be suppressed by gradually enlarging Duty of the PWM signal to the CE pin.
• Selection of Inductors
The peak current of the inductor at normal mode can be calculated as next formula:
ILmax=1.25 × ILED × VOUT / VIN + 0.5 × VIN × (VOUT - VIN) / (L × VOUT × fosc)
When the start-up or dimming control by CE pin, transient current flows, the peak current must be equal or
less than the current limit of the IC. The peak current should not beyond the rating current of the inductor.
When 4LEDs are driven with VIN=3.6V, the recommended inductance value is 22μH or more.
• Selection of Capacitors
Set 1μF or more value bypass capacitor C1 between VIN pin and GND pin as close as possible.
Set 0.22μF or more capacitor C2 between VOUT pin and GND pin.
As for R1201x05xA version, set 1μF or more capacitor C2 between VOUT pin and GND pin.
8
R1201x
OPERATION OF STEP-UP DC/DC CONVERTER AND OUTPUT CURRENT
<Basic Circuit>
i2
Diode
IOUT
L
V
IN
VOUT
i1
Lx Tr
CL
GND
<Current through L>
Discontinuous mode
Continuous mode
ILmax
IL
IL
ILmax
ILmin
ILmin
topen
Iconst
t
t
ton
toff
ton
T=1/fosc
toff
T=1/fosc
There are two operation modes of the step-up PWM control-DC/DC converter. That is the continuous mode
and discontinuous mode by the continuousness inductor.
When the transistor turns ON, the voltage of inductor L becomes equal to VIN voltage. The increase value of
inductor current (i1) will be
Δi1 = VIN × ton / L .................................................................................................. Formula 1
As the step-up circuit, during the OFF time (when the transistor turns OFF) the voltage is continually supply
from the power supply. The decrease value of inductor current (i2) will be
∆i2 = (VOUT - VIN) × topen / L................................................................................... Formula 2
At the PWM control-method, the inductor current become continuously when topen=toff, the DC/DC converter
operate as the continuous mode.
9
R1201x
In the continuous mode, the variation of current of i1 and i2 is same at regular condition.
VIN × ton / L = (VOUT - VIN) × toff / L..........................................................................Formula 3
The duty at continuous mode will be
duty (%) = ton / (ton + toff) = (VOUT - VIN) / VOUT .......................................................Formula 4
The average of inductor current at tf = toff will be
IL1(Ave.) = VIN × ton / (2 × L).................................................................................Formula 5
If the input voltage = output voltage,the IOUT will be
2
IOUT = VIN × ton / (2 × L × VOUT)..............................................................................Formula 6
If the IOUT value is large than above the calculated value (Formula 6), it will become the continuous mode,At
this status, the peak current (ILxmax) of inductor will be
ILxmax = IOUT × VOUT / VIN + VIN × ton / (2 × L )
ILxmax = IOUT × VOUT / VIN + VIN × T × (VOUT - VIN) / (2 × L × VOUT)............................Formula 7
The peak current value is larger than the IOUT value. In case of this, selecting the condition of the input and the
output and the external components by considering of ILmax value.
The explanation above is based on the ideal calculation, and the loss caused by LX switch and the external
components are not included.
The actual maximum output current will be between 50% and 80% by the above calculations. Especially, when
the IL is large or VIN is low, the loss of VIN is generated with on resistance of the switch. Moreover, it is necessary
to consider Vf of the diode (approximately 0.8V) about VOUT.
10
R1201x
TYPICAL CHARACTERISTICS
1) Efficiency vs. Output Current Characteristics (fosc=1.2MHz)
2LEDs
3LEDs
90
85
80
75
70
65
60
55
50
90
85
80
75
70
65
60
55
50
VIN=2.3V
VIN=1.8V
VIN=3.6V
VIN=5.0V
VIN=3.6V
VIN=5.0V
0
5
10
15
20
0
5
10
15
20
Output Current IOUT (mA)
Output Current IOUT (mA)
4LEDs
5LEDs
90
85
80
75
70
65
60
55
50
90
85
80
75
70
65
60
55
50
VIN=2.8V
VIN=2.8V
VIN=3.6V
VIN=5.0V
VIN=3.6V
VIN=5.0V
0
5
10
15
20
0
5
10
15
20
Output Current IOUT (mA)
Output Current IOUT (mA)
4LEDs（VIN =3.6V）
90
85
80
75
70
65
60
55
50
LQH32CN220K53 (3.2x2.5x1.55)
VLF3010ST-220 (3.0x2.8x1.0)
LQH2MCN220K02 (2.0x1.6x0.9)
0
5
10
15
20
Output Current IOUT (mA)
11
R1201x
2) Efficiency vs. Output Current Characteristics (fosc=1.0MHz)
2LEDs
3LEDs
90
85
80
75
70
65
60
55
50
90
85
80
75
70
65
60
55
50
VIN=2.8V
VIN=3.6V
VIN=5.0V
VIN=1.8V
VIN=3.6V
VIN=5.0V
0
5
10
15
20
0
5
10
15
20
OUT
Output Current I
(mA)
Output Current IOUT (mA)
4LEDs
5LEDs
90
85
80
75
70
65
60
55
50
90
85
80
75
70
65
60
55
50
VIN=2.8V
VIN=2.8V
VIN=3.6V
VIN=5.0V
VIN=3.6V
VIN=5.0V
0
5
10
15
20
0
5
10
15
20
OUT
Output Current I
(mA)
Output Current IOUT (mA)
4LEDs（VIN =3.6V）
90
85
80
75
70
65
60
55
50
LQH32CN220K53 (3.2x2.5x1.55)
VLF3010ST-220 (3.0x2.8x1.0)
LQH2MCN220K02 (2.0x1.6x0.9)
0
5
10
15
20
OUT
Output Current I
(mA)
12
R1201x
3) PWM Dimming Duty Cycle vs. Output Current (R1=10Ω)
25
Freq=200Hz
Freq=1kHz
20
15
10
5
Freq=300kHz
0
0
20
40
60
80
100
PWM Dimming Duty Cycle (%)
4) Output Current Ripple during PWM Dimming
f=10kHz
f=50kHz
20
20
18
16
14
12
10
8
CEInput Voltage
Output Current
18
16
14
12
10
8
CEInput Voltage
Output Current
8
6
4
2
0
8
6
4
2
0
0
100
200
300
400
500
0
20
40
60
80
100
Time t (µs)
Time t (µs)
f=300kHz
20
CEInput Voltage
18
16
14
12
10
8
Output Current
8
6
4
2
0
0
5
10
15
20
Time t (µs)
13
R1201x
5) Diode Forward Voltage vs. Temperature
6) VFB Voltage vs. Temperature
0.205
1.0
0.204
0.203
0.202
0.201
0.200
0.199
0.198
0.197
0.196
0.195
0.9
0.8
0.7
0.6
0.5
-50
-25
0
25
50
opt
75
100
-50
-25
0
25
50
opt
75
100
Temparature T (°C)
Temparature T (°C)
7) Supply Current vs. Temperature (fosc
=
1.2MHz)
8) Supply Current vs. Temperature(fosc
=
1.0MHz)
800
800
700
600
500
400
700
600
500
400
-50
-25
0
25
50
75
100
-50
-25
0
25
50
75
100
Temparature Topt (°C)
Temparature T (°C)
opt
9) Oscillator Frequency vs. Temperature
10）Oscillator Frequency vs. Temperature
(fosc=1.2MHz)
(fosc=1.0MHz)
1050
1250
1025
1000
975
1225
1200
1175
1150
950
-50 -25
0
25
50
75 100
-50 -25
0
25
50
opt
75
100
Temparature Topt (°C)
Temparature T (°C)
14
R1201x
11) Maxduty vs. Temperature
12) UVLO Output Voltage vs. Temperature
94
93
92
91
90
89
88
1.80
1.75
1.70
UVLO Released Voltage
1.65
1.60
UVLO Detector Threshold
1.55
1.50
-50
-25
0
25
50
opt
75
100
-50
-25
0
25
50
opt
75
100
Temparature T (°C)
Temparature T (°C)
13) OVP Voltage vs. Temperature
R1201x02xA
R1201x04xA
10.0
19.0
18.5
18.0
17.5
17.0
9.5
OVPDetector Threshold
OVPDetector Threshold
OVPReleased Voltage
9.0
8.5
8.0
OVPReleased Voltage
-50
-25
0
25
50
opt
75
100
-50
-25
0
25
50
75
100
Temparature T (°C)
Temparature Topt (°C)
14) Switch ON Resistance vs. Temperature
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
-50
-25
0
25
50
opt
75
100
Temparature T (°C)
15
R1201x
15) LX Current Limit vs. Temperature
1000
VIN=1.8V
900
800
700
600
500
400
300
200
VIN=2.5V
VIN=3.6V
VIN=5.5V
-50
-25
0
25
50
opt
75
100
Temparature T (°C)
16) OVP Operating Output Voltage Waveform
R1201x04xA
22
21
20
19
18
17
16
15
-10
0
10 20 30 40 50 60 70 80
Time t (ms)
16
1.The products and the product specifications described in this document are subject to change or
discontinuation of production without notice for reasons such as improvement. Therefore, before
deciding to use the products, please refer to Ricoh sales representatives for the latest
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described herein.
4.The technical information described in this document shows typical characteristics of and
example application circuits for the products. The release of such information is not to be
construed as a warranty of or a grant of license under Ricoh's or any third party's intellectual
property rights or any other rights.
5.The products listed in this document are intended and designed for use as general electronic
components in standard applications (office equipment, telecommunication equipment,
measuring instruments, consumer electronic products, amusement equipment etc.). Those
customers intending to use a product in an application requiring extreme quality and reliability,
for example, in a highly specific application where the failure or misoperation of the product
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8.Please contact Ricoh sales representatives should you have any questions or comments
concerning the products or the technical information.
For the conservation of the global environment, Ricoh is advancing the decrease of the negative environmental impact material.
After Apr. 1, 2006, we will ship out the lead free products only. Thus, all products that will be shipped from now on comply with RoHS Directive.
Basically after Apr. 1, 2012, we will ship out the Power Management ICs of the Halogen Free products only. (Ricoh Halogen Free products are
also Antimony Free.)
Halogen Free
RICOH COMPANY, LTD.
Electronic Devices Company
http://www.ricoh.com/LSI/
RICOH COMPANY, LTD.
Electronic Devices Company
● Higashi-Shinagawa Office (International Sales)
3-32-3, Higashi-Shinagawa, Shinagawa-ku, Tokyo 140-8655, Japan
Phone: +81-3-5479-2857 Fax: +81-3-5479-0502
RICOH EUROPE (NETHERLANDS) B.V.
● Semiconductor Support Centre
“Nieuw Kronenburg”Prof. W.H. Keesomlaan 1, 1183 DJ, Amstelveen, The Netherlands
P.O.Box 114, 1180 AC Amstelveen
Phone: +31-20-5474-309 Fax: +31-20-5474-791
RICOH ELECTRONIC DEVICES KOREA Co., Ltd.
11 floor, Haesung 1 building, 942, Daechidong, Gangnamgu, Seoul, Korea
Phone: +82-2-2135-5700 Fax: +82-2-2135-5705
RICOH ELECTRONIC DEVICES SHANGHAI Co., Ltd.
Room403, No.2 Building, 690#Bi Bo Road, Pu Dong New district, Shanghai 201203,
People's Republic of China
Phone: +86-21-5027-3200 Fax: +86-21-5027-3299
RICOH COMPANY, LTD.
Electronic Devices Company
● Taipei office
Room109, 10F-1, No.51, Hengyang Rd., Taipei City, Taiwan (R.O.C.)
Phone: +886-2-2313-1621/1622 Fax: +886-2-2313-1623
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R1201N052A-TR-F
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