R1232D RICOH [RICOH electronics devices division], R1232D Datasheet
R1232D
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R1232D Summary of contents
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... The R1232D Series are CMOS-based PWM step-down DC/DC converters with synchronous rectifier, low supply current output capacitor, a 10µF or more ceramic capacitor can be used with the R1232D. Each of these ICs consists of an oscillator, a PWM control circuit, a voltage reference unit, an error amplifier, a soft-start circuit, protection circuits, a protection against miss operation under low voltage (UVLO), a chip enable circuit, a synchronous rectifier, Nch ...
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... Slope Current Limit Compensation Compensation PWM Output Error Comparator Contorol Amplifer Oscillator Soft Start UVLO TEST Circuit 6 TEST “L” or GND Fixed R1232D001C Slope Current Limit Compensation Compensation PWM Output Error Comparator Contorol Amplifer Oscillator Soft Start UVLO ...
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... SELECTION GUIDE In the R1232D Series, the output voltage, the oscillator frequency, and the taping type for the ICs can be selected at the user's request. The selection can be made with designating the part number as shown below; R1232Dxx1x-xx-x ↑ ↑ ↑ ↑ ↑ ...
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... R1232D PIN CONFIGURATION PIN DESCRIPTIONS Pin No Symbol ∗ Tab in the parts have GND level. (They are connected to the reverse side of this IC.) Do not connect to other wires or land patterns. ABSOLUTE MAXIMUM RATINGS Symbol V V Supply Voltage Pin Voltage ...
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... =5.0V 1 =2.6V-> 1.5V 2. =1.5V-> 2. =5.5V, V =5.5V/0V −0 =5.5V =0V −0.1 =5.5V/0V V OUT =5.5V 1 =3. =3. R1232D Topt=25°C Typ. Max. Unit 5.5 V ×1.020 V 0.800 0.816 V ppm/ ±150 °C 1.00 1.25 MHz µA 140 190 µA 0.0 5.0 µA 0.0 5.0 Ω 0.20 0.35 Ω 0.20 0. 1.0 1.4 2.0 10.0 ms 1.4 A 2.25 2. UVLO1 2 ...
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... R1232D • R1232DxxxB/D Symbol V Operating Input Voltage IN V Step-down Output Voltage OUT V Feedback Voltage FB Step-down Output Voltage ∆V /∆Topt OUT Temperature Coefficient fosc Oscillator Frequency I Supply Current DD Istandby Standby Current I L Leakage Current LXleak Resistance of Pch Transistor V ONP R ON Resistance of Nch Transistor V ...
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... X V AGND IN V TEST PGND L X OSCILLOSCOPE V AGND IN V TEST PGND AGND IN V TEST Soft Start Time Test Circuit A PGND AGND IN V TEST Test Circuit for ON resistance of L OSCILLOSCOPE R1232D ...
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... R1232D TYPICAL APPLICATION AND TECHNICAL NOTES • Fixed Output Voltage Type • Adjustable Output Type OUT L In terms of setting R1, R2, Cb, refer to the technical notes. 8 PGND AGND IN V TEST PGND AGND IN V TEST 10µ ...
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... PCB patterns and the IC do not exceed their respected rated values. and V . Set the same level as AGND and PGND close as possible to the IC, in particular, IN OUT output is Hi-Z, or both P-channel transistor and N-channel transistor of X lines sufficiently. Large switching current may flow in these lines. If the OUT R1232D 9 ...
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... R1232D OPERATION of step-down DC/DC converter and Output Current The step-down DC/DC converter charges energy in the inductor when L energy from the inductor when L voltage than the input voltage is obtained. The operation will be explained with reference to the following diagrams: <Basic Circuits> Step 1: P-channel Tr. turns on and current IL (=i1) flows, and energy is charged into C IL increases from Ilmin (=0) to reach ILmax in proportion to the on-time period (ton) of P-channel Tr ...
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... ON resistance of P-channel Tr. and N-channel Tr and R , and the DC resistor of the inductor is described as R ONN +L×I /ton .............................................................................. Equation 3 RP ×I ....................................................................................... Equation 4 OUT ×I +R ×I −R ×I )/(V ) ........................................... Equation 5 L OUT IN ONN OUT ONP OUT −R ×I )×D /fosc/L .............................................................. Equation 6 L OUT ON Tr follows; X R1232D ...
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... R1232D How to Adjust Output Voltage and about Phase Compensation As for Adjustable Output type, feedback pin (V Output Voltage following equation; OUT V R1+R2=V :R2 OUT FB =V ×(R1+R2)/R2 V OUT FB Thus, with changing the value of R1 and R2, output voltage can be set in the specified range. In the DC/DC converter, with the load current and external components such as L and C, phase might be behind 180 degree ...
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... Once the IC is latched, to release the protection, input "L" with CE pin, or make the supply voltage at UVLO level or less. Output Output Short Short Intemal Soft-start Set Voltage Stable Delay Time of Protection would be latched with "OFF". (Output X R1232D Latched 13 ...
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... OUT V =3.3V, 5.0V IN 100 =5.0V =3.3V 100 1000 (mA) OUT R1232D331A V =5. 100 Output Current I (mA) OUT R1232D331B V =5. 100 Output Current I (mA) OUT R1232D331A V =5. 100 Output Current I (mA) OUT R1232D331B 1000 1000 1000 ...
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... Time t(ns) V =3.3V, 5.0V IN 100 =5.0V =3.3V 100 1000 (mA) OUT =600mA OUT 0.04 0.03 0.02 0.01 -0.01 -0.02 -0.03 -0. =600mA OUT 0.04 0.03 0.02 0.01 -0.01 -0.02 -0.03 -0.04 0.5 1.0 1.5 V =5. 100 Output Current I (mA) OUT R1232D331A V =5.0V, I =600mA IN OUT Time t(ns) R1232D331B V =5.0V, I =600mA IN OUT 0 -1.5 -1.0 -0.5 0 0.5 1.0 Time t(ns) R1232D 1000 3 1.5 15 ...
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... Output Voltage -0.2 -0.3 100 150 200 I =600mA OUT 4.5 5.0 5.5 6.0 (V) IN R1232D121A V =5.0V IN Output Current 600mA→10mA 0 Output Voltage - 100 150 Time t (µs) R1232D121B V =5.0V IN Output Current 600mA→10mA 0 Output Voltage - 100 150 Time t (µs) R1232D331A I =600mA OUT 3.32 3.31 3.30 3.29 3.28 3.0 3.5 4.0 4.5 5.0 Input Voltage V (V) IN R1232D121B ...
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... OUT 1V/div IL 200mA/div 200µs/div R1232D331B I =600mA OUT 2.4 2.3 2.2 2.1 2.0 5.0 5.5 6.0 (V) IN Synchronous Rectifier Tr. Nch on Resistance I =200mA OUT 0.14 0.13 0.12 0.11 0.10 0.09 5.0 5.5 6.0 2.5 ( 5V/div V OUT 1V/div IL 200mA/div I =600mA OUT 2.5 3.0 3.5 4.0 4.5 5.0 5.5 Input Voltage V ( =200mA OUT 3.0 3.5 4.0 4.5 5.0 5.5 Input Voltage V (V) IN R1232D121A V =5.0V, L=4.7µH Rload=12Ω IN 200µs/div R1232D331B R1232D 6.0 6.0 17 ...
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... Temperature Topt(°C) 10) Oscillator Frequency vs. Temperature R1232D121A 1.30 1.20 1.10 1.00 0.90 0.80 0.70 -40 -15 10 Temperature Topt(° 5V/div V OUT 1V/div IL 200mA/div V =5.0V IN 3.40 3.35 3.30 3.25 3. =5.0V IN 2.50 2.40 2.30 2.20 2.10 2. =5.0V, L=2.7µH Rload=33Ω IN 100µs/div R1232D331A V =5.0V IN -40 - Temperature Topt(°C) R1232D331B V =5.0V IN -40 - Temperature Topt(° ...
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... Rload=0Ω 600 550 500 450 400 350 300 2.50 2.40 2.30 2. R1232D331B V =5.0V IN -40 - Temperature Topt(°C) R1232D331B V =5.0V, Rload=0Ω IN -40 - Temperature Topt(°C) R1232D121A -40 - Temperature Topt(°C) R1232D ...
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... Temperature Topt(°C) 16) Lx Transistor On Resistance vs. Temperature Driver Tr. Pch ON Resistance 0.30 0.20 0.10 0.00 -40 -15 10 Temperature Topt(°C) 20 1.5 1.3 1.0 0.8 0 =5. =5.0V IN 0.30 0.20 0.10 0. R1232D121A V =5.0V, CE=L Threshold IN -40 - Temperature Topt(°C) Rectifier Tr.Nch ON Resistance V =5.0V IN -40 - Temperature Topt(° ...
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... Current Limit vs. Temperature R1232D121A -0.80 -1.05 -1.30 -1.55 -1.80 -40 -15 10 Temperature Topt(°C) 18) Protection Delay Time vs. Temperatures R1232D121A 10.0 7.5 5.0 2.5 0.0 -40 -15 10 Temperature Topt(°C) V =5.0V IN -0.80 -1.05 -1.30 -1.55 -1. =5.0V IN 6.0 5.0 4.0 3.0 2.0 1.0 0 R1232D331B V =5.0V IN -40 - Temperature Topt(°C) R1232D331B V =5.0V IN -40 - Temperature Topt(°C) R1232D ...
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PACKAGE INFORMATION • SON-8 PACKAGE DIMENSIONS 8 0.65 TAPING SPECIFICATION 2.0MAX. TAPING REEL DIMENSIONS (1reel=3000pcs) 2.9 ± 0.2 0.13±0.05 0.475TYP Attention : Tab suspension leads in the parts have V connected to the reverse side of this ...
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PACKAGE INFORMATION POWER DISSIPATION (SON-8) This specification is at mounted on board. Power Dissipation (P This specification is based on the measurement at the condition below: Measurement Conditions Environment Board Material Board Dimensions Copper Ratio Through-hole Measurement Result Power Dissipation ...
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... MARK INFORMATION R1232D SERIES MARK SPECIFICATION • SON • Part Number vs. Product Code Product Code Part Number Part Number R1232D091A R1232D091B R1232D101A R1232D101B R1232D111A R1232D111B R1232D121A R1232D121B ...