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R1202L511A-TR [RICOH]

Switching Regulator, 0.45A, 1400kHz Switching Freq-Max, CMOS, PDSO6, 1.60 X 1.60 MM, HALOGEN FREE AND ROHS COMPLIANT, DFN-6;
R1202L511A-TR
型号： R1202L511A-TR
厂家： RICOH ELECTRONICS DEVICES DIVISION    RICOH ELECTRONICS DEVICES DIVISION
描述：

Switching Regulator, 0.45A, 1400kHz Switching Freq-Max, CMOS, PDSO6, 1.60 X 1.60 MM, HALOGEN FREE AND ROHS COMPLIANT, DFN-6

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R1202x Series  
PWM Step-up DC/DC Converter for White LED/PMOLED and General Use with shutdown function  
The R1202x Series are CMOS-based PWM step-up DC/DC converters, which are optimized to drive white LEDs and PMOLED with constant current.  
There are two types. The A/B versions are optimized for the general use or the drive of PMOLED, and the D version is optimized for the serial drive  
of white LED with constant current. The R1202x includes an under-voltage lockout circuit (UVLO), a soft-start circuit, and an over-voltage protection  
circuit (OVP), a thermal shutdown circuit. By simply using an inductor, divider resistors, and capacitors as external components, PMOLED and  
white LEDs can be driven with high efficiency. At the standby mode, the internal NPN transistor can separate the output from the input. (Shutdown  
function) The A/B version with auto-discharge function is selectable. D Version can set the LED current with feedback resistor (R1). The brightness  
of the LEDs and the soft-start time can be adjusted by applying a PWM signal (200Hz to 300kHz) to the CE pin. In addition to DFN1616-6B, 0.95mm  
thickness TSOT-23-6 is available.  
FEATURES  
• Supply Current (IDD)····························· Typ. 800μA (No switching)  
• Coil-current Limit Circuit ·················Current Limit Typ. 350mA  
/ Typ. 700mA selectable  
• Over Voltage Protection Circuit (OVP)  
• Soft Start Time (tstart) ·······················Typ. 2ms (A/B Version)  
Controllable by PWM signal  
• Standby Current (Istandby  
)
······················· Max. 5μA (CE="L"  
)
• Input Voltage Range (VIN)···················· 2.3V to 5.5V (A/B Version)  
1.8V to 5.5V (D Version)  
• Feedback Voltage (VFB  
)
······················ 1.0V (A/B Version)  
0.2V (D Version)  
to the CE pin (D Version)  
• Feedback Voltage Accuracy ················ ± 15mV (A/B Version)  
• Thermal Shutdown Circuit ··············Stops at 150°C  
• Auto-discharge Function·················A Version  
• Shutdown Function  
± 10mV (D Version)  
• Oscillator Frequency (fosc)···················· 1.2MHz  
•
········ Min. 86%, Typ. 91%  
•
·······D Version  
• OUsVcLillaOtoDr MeatexicmtuVmoDltuatgy eCy(cVleU(VMLOa)xd··u·t·y·)········· Typ. 2.0V (A/B Version)  
• LPEaDckHaiggeh-ss·p··e·e··d···D··i·m···m··i·n··g···C··o··n··tr··o·l········DFN1616-6B, TSOT-23-6  
Typ. 1.6V (D Version)  
BLOCK DIAGRAMS  
R1202xxxxA  
R1202xxxxB  
R1202xxxxD  
(With Auto-discharge function, VFB=1.0V)  
(Without Auto-discharge function, VFB=1.0V) (Without Auto-discharge function, VFB=0.2V)  
VFB  
VIN  
L
X
VOUT  
VFB VIN LX VOUT  
VFB VIN LX VOUT  
UVLO  
UVLO  
UVLO  
Error Amp.  
Error Amp.  
Error Amp.  
Switch  
Control  
Switch  
Control  
Switch  
Control  
PWM Comp.  
PWM Comp.  
PWM Comp.  
Driver  
Control  
Driver  
Control  
Driver  
Control  
R
Q
R
Q
R
Q
S
S
S
Vref  
PWM  
Vref  
Vref  
OSC  
OSC  
OSC  
OVP  
OVP  
OVP  
EN  
Cntrl  
Soft Start  
Soft Start  
Slope  
Compensation  
Current  
Limit  
Current  
Sense  
Slope  
Compensation  
Current  
Limit  
Current  
Sense  
Slope  
Compensation  
Current  
Limit  
Current  
Sense  
Thermal  
Shutdown  
Thermal  
Shutdown  
Thermal  
Shutdown  
Shutdown  
delay  
Chip Enable  
Chip Enable  
Chip Enable  
Σ
Σ
Σ
CE  
GND  
CE  
GND  
CE  
GND  
SELECTION GUIDES  
TYPICAL APPLICATIONS  
R1202xxxxA/B  
R1202xxxxD  
Halogen Free  
Package  
Q'ty per Reel  
Part No.  
L1  
10μH to 22μH  
L1  
R1202L  
R1202L  
.
x$  
1
.
∗-TR  
#-TR  
.
.
10μH to 22μH  
DFN1616-6B 5,000 pcs  
TSOT-23-6 3,000 pcs  
y
$
.
1.  
C1  
1μF  
C1  
1μF  
C2  
0.22μF  
R1202N  
R1202N  
.
.
x$  
.
.
3
.
∗-TR-FE  
#-TR-FE  
V
IN  
LX  
VIN  
LX  
y
$
3.  
.
x
.
:
Specify the OVP voltage.  
CE  
VOUT  
CE  
VOUT  
(
.
3
.
) 14V, (  
.
4
.
) 17V, (  
.5  
.
) 19V, (  
.
6
.
) 21V, (  
.
7.  
) 23V  
C3  
R3  
C2  
1μF  
R2  
R1  
y
.
.
: Specify the OVP voltage.  
(
.
3
.
) 14V, (  
.
7
.
) 23V  
GND  
VFB  
GND  
VFB  
R1  
10Ω  
$
: Specify the Coil Current limit.  
.
.
(
.
1
.
) Typ. 350mA, (  
.
2
.
) Typ. 700mA  
: (  
(
: (  
.
.
.
A
B
D
.
.
.
)
)
)
with auto-discharge function, VFB=1.0V  
without auto-discharge function, VFB=1.0V  
without auto-discharge function, VFB=0.2V.  
.
.
∗
.
TYPICAL CHARACTERISTICS  
.
#
.
R1202N713D Efficiency vs. Output Current  
PACKAGES (Top View)  
5LEDs  
(
10μH  
)
5LEDs (22μH)  
90  
85  
80  
75  
70  
65  
60  
55  
50  
90  
85  
80  
75  
70  
65  
60  
55  
50  
DFN1616-6B  
TSOT-23-6  
6 5 4  
6
5
4
∗
1
2
3
1
2
3
V
V
V
V
IN=5.0V  
IN=4.2V  
IN=3.6V  
IN=3.0V  
V
V
V
V
IN=5.0V  
IN=4.2V  
IN=3.6V  
IN=3.0V  
1
2
3
CE  
VFB  
Lx  
4
5
6
GND  
VIN  
VOUT  
1
2
3
CE  
VOUT  
VIN  
4
5
6
Lx  
GND  
VFB  
0
5
10  
15  
20  
0
5
10  
15  
20  
Output Current IOUT (mA)  
Output Current IOUT (mA)  
The tab is substrate level (GND).  
∗)  
APPLICATIONS  
• PMOLED power supply for hand-held equipment  
• White LED backlight for hand-held equipment  
No.EK-255-121001  
Step-up DC/DC Converter  
R1202x Series  
Step-up DC/DC Converter  
PWM Step-up DC/DC Converter for White LED/PMOLED and General Use with shutdown function  
R1202x Version Lineup  
Product Name  
Application  
R1202xxxxA/B  
PMOLED, General Use  
R1202xxxxD  
White LED (Serial drive)  
0.2V  
VFB Voltage  
1.0V  
Input Voltage Range  
OVP Voltage  
Function  
2.3V to 5.5V  
1.8V to 5.5V  
Select from 14V, 17V, 19V, 21V, 23V  
Thermal Shutdown Circuit  
Shutdown Function  
Select from 14V, 23V  
Thermal Shutdown Circuit  
Shutdown Function  
Auto-discharge Function  
1μF to 4.7μF  
The Method of Output Voltage Setting  
LED High-speed Dimming Control  
0.22μF to 1μF  
LED Current setting  
Output Capacitor  
Comment  
When CE pin input is "H" (Duty=100%), LED current can be set  
with feedback resistor (R1).  
Output Voltage= (R1+ R2) / R1  
L1  
10μH  
L1  
10μH  
ILED=0.2 / R1  
C1  
1μF  
C1  
1μF  
C2  
0.22μF  
VIN  
LX  
VIN  
LX  
CE  
VOUT  
CE  
VOUT  
C3  
R3  
C2  
1μF  
R2  
R1  
GND  
VFB  
GND  
VFB  
R1  
10Ω  
The total value of R1 and R2 should be equal or less  
than 300kΩ.  
Voltage rating of capacitor (C2) is recommended to  
LED Dimming Control  
The LED brightness can be controlled by inputting the PWM  
signal to the CE pin. The current of LEDs when High-Duty of the  
CE input is ”Hduty” reaches the value as in next formula.  
ILED=Hduty × VFB / R1  
use 1.5 times or more the output setting voltage.  
Soft-Start Time  
The soft start time is set to Typ. 2ms within the IC.  
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.  
In case of 6 lights or more, we recommends the R1205x Series and R1218x Series*.  
More than 5 lights of R1218x Series requires an external diode and OVP Voltage is set up to 31.5V. (Maximum rating of VOUT pin is 34V)  
∗) For detail, please check our website.  
The currently available information as of October 2012 is provided in this New Product News.  
EK-255-121001  

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