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參數(shù)資料
| 型號： | R1202L511B-TR |
| 廠商： | RICOH COMPANY LTD |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 0.45 A SWITCHING REGULATOR, 1400 kHz SWITCHING FREQ-MAX, PDSO6 |
| 封裝： | 1.60 X 1.60 MM, HALOGEN FREE AND ROHS COMPLIANT, DFN-6 |
| 文件頁數(shù)： | 1/23頁 |
| 文件大?。?/td> | 572K |
| 代理商： | R1202L511B-TR |
R1202x SERIES
STEP-UP DC/DC CONVERTER with SHUTDOWN FUNCTION
NO.EA-255-110404
1
OUTLINE
The R1202x Series are CMOS-based PWM step-up DC/DC converter ICs with low supply current.
Each of these ICs consists of an NMOS FET, NPN transistor, an oscillator, a PWM comparator, a voltage
reference unit, an error amplifier, a current limit circuit, an under voltage lockout circuit (UVLO), an over-voltage
protection circuit (OVP), a soft-start circuit, a Maxduty limit circuit, and a thermal shutdown protection circuit. By
simply using an inductor, a resistor, and capacitors as external components, a high-efficiency step-up DC/DC
converter can be easily configured. At the standby mode, a rectifier transistor can separate the output from the
input.
The R1202x Series include a thermal shut-down circuit and an under-voltage lockout circuit (UVLO) which
separate the output from the input to shut down the current when the over heat caused when the output is
connected to the Gnd is detected and also during the UVLO detection. As other protection functions, the R1202x
Series contain a cycle by cycle current limit circuit that limits the Lx peak current, and an over-voltage protection
circuit (OVP) that detects the output overvoltage.
The R1202x Series offer three versions: the R1202xxxxA/B versions, which are optimized for constant-voltage
power supply and the R1202xxxxD version, which is optimized to drive serial white LEDs with constant current.
While the R1202xxxxA version discharges the VOUT output to 0V at the shutdown, the R1202xxxxB version doesn’t.
The brightness of the white LEDs can be adjusted quickly by applying a PWM signal (200Hz to 300kHz) to the CE
pin.
The R1202x Series are available in DFN1616-6B and TSOT-23-6 packages.
FEATURES
Input Voltage Range .........................................2.3V to 5.5V (R1202xxxxA/B)
1.8V to 5.5V (R1202xxxxD)
Supply Current ................................................. Typ. 800μA
Standby Current ............................................... Max. 5μA
Feedback Voltage ............................................ 1.0V±15mV (R1202xxxxA/B)
0.2V
±10mV (R1202xxxxD)
Oscillator Frequency ........................................ Typ. 1.2MHz
Maximum Duty Cycle ....................................... Typ. 91%
UVLO Function ............................................... Typ.2.0V (Hys.Typ.0.2V) (R1202xxxxA/B)
Typ.1.6V (Hys.Typ.0.1V) (R1202xxxxD)
Lx Current Limit Function................................. Select from 350mA, 700mA
Over Voltage Protection ................................... Select from 14V-23V (Refer the Selection Guide)
LED dimming control for R1202xxxxD............. by external PWM signal (Frequency 200Hz to 300kHz)
Thermal Protection Function .......................... Typ.150C(Hys.Typ.50C)
Built-in Auto Discharge Function...................... R1202xxxxA
NMOS ON Resistance ..................................... 1.35
Packages ......................................................... DFN1616-6B, TSOT-23-6
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