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R1232D SERIES
PWM STEP-DOWN DC/DC CONVERTER WITH SYNCHRONOUS RECTIFIER
NO.EA-129-0606
OUTLINE
The R1232D Series are CMOS-based PWM step-down DC/DC converters with synchronous rectifier, low supply current. As an output capacitor, a 10F 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. driver transistor, and so on. A low ripple, high efficiency step-down DC/DC converter can be easily composed of this IC with only a few kinds of external components, or an inductor and capacitors. (As for R1232D001x type, divider resistors are also necessary.) In terms of the output voltage, it is fixed internally in the R1232Dxx1x types. While in the R1232D001x types, the output voltage is adjustable with external divider resistors. As protection circuits, current limit circuit which limits peak current of LX at each clock cycle, and latch type protection circuit exist. The latch protection works if the term of the over-current condition keeps on a certain time. Latch-type protection circuit works to latch an internal driver with keeping it disable. To release the condition of protection, after disable this IC with a chip enable circuit, enable it again, or restart this IC with power-on or make the supply voltage at UVLO detector threshold level or lower than UVLO.
FEATURES
* Two choices of Oscillator Frequency ............................ 1MHz, 2.25MHz (Small inductors can be used. 4.7H for 1MHz/2.2H for 2.25MHz) * Built-in Driver ON Resistance ....................................... P-channel 0.2 (at VIN=5.0V) * Built-in Soft-start Function............................................. Typ. 1.0ms (fosc=1MHz type) * Output Voltage .............................................................. 0.9V to 3.3V (xx1x Type) 0.8V to VIN (001x Type) * High Accuracy Output Voltage ......................................2.0% * Built-in Current Limit Circuit .......................................... Typ. 1.4A * Package ........................................................................SON-8 (t=0.9mm)
APPLICATIONS
* Power source for portable equipment such as PDA, DSC, Notebook PC. * Power source for HDD
1
R1232D
BLOCK DIAGRAMS
R1232Dxx1A/B
VDD AGND
3 VIN 2
Current Limit
7
Slope Compensation Phase Compensation
5
VOUT
Q
R S PWM Comparator Error Amplifer Soft Start Vref
LX
8
Output Contorol
Oscillator
4
CE
"H" Active
TEST Circuit
UVLO Chip Enable
1 PGND
6 TEST
"L" or GND Fixed
R1232D001C/D
VDD AGND
3 VIN 2
Current Limit
7
Slope Compensation Phase Compensation
5
VFB
Q
R S PWM Comparator Error Amplifer Soft Start Vref
LX
8
Output Contorol
Oscillator
4
CE
"H" Active
TEST Circuit
UVLO Chip Enable
1 PGND
6 TEST
"L" or GND Fixed
2
R1232D
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 Part Number
a bc d e Code a b Contents Setting Output Voltage(VOUT): Stepwise setting with a step of 0.1V in the range of 0.9V to 3.3V is possible for fixed output version."00" is for Output Voltage Adjustable version (0.8V as the feedback voltage.) 1: fixed Designation of Optional Function A: 1MHz, Fixed Output Voltage B: 2.25MHz, Fixed Output Voltage C: 1MHz, Adjustable Output Voltage D: 2.25MHz, Adjustable Output Voltage Designation of Taping Type; (Refer to Taping Specification)"TR" is prescribed as a standard. Designation of Composition of pin plating -F : Lead free plating
c
d e
3
R1232D
PIN CONFIGURATION
SON-8
Top View
8 7 65
Bottom View
56 7 8
1
2
34
43
2
1
PIN DESCRIPTIONS
Pin No 1 2 3 4 5 6 7 8 Symbol PGND VIN VDD CE VOUT/VFB TEST AGND LX Ground Pin Voltage Supply Pin Voltage Supply Pin Chip Enable Pin (active with "H") Output/Feedback Pin Test Pin (Forced to the "L" or GND level.) Ground Pin LX Switching Pin (CMOS Output) Pin Description
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 VIN VDD VLX VCE VTEST VFB ILX PD Topt Tstg VIN Supply Voltage VDD Pin Voltage LX Pin Voltage CE Pin Input Voltage TEST Pin Input Voltage VFB Pin Input Voltage LX Pin Output Current Power Dissipation (SON-8)*
1
Item
Rating 6.5 6.5 -0.3 to VIN + 0.3 -0.3 to VIN + 0.3 -0.3 to VIN + 0.3 -0.3 to VIN + 0.3 1.5 480 -40 to 85 -55 to 125
Unit V V V V V V V mW C C
Operating Temperature Range Storage Temperature Range
1) For the power dissipation, refer to the package information on the website.
4
R1232D
ELECTRICAL CHARACTERISTICS
*
R1232DxxxA/C
Topt=25C
Symbol VIN
Item Operating Input Voltage Step-down Output Voltage Feedback Voltage Step-down Output Voltage Temperature Coefficient Oscillator Frequency Supply Current Standby Current LX Leakage Current
Conditions VIN=VCE=5.0V, IOUT=10mA VIN=VCE=5.0V, IOUT=10mA -40C
< =
Min. 2.6
Typ.
Max. 5.5
Unit V
VOUT
VFB VOUT/Topt fosc IDD Istandby ILXleak RONP RONN Maxduty tstart tprot ILXlimit VUVLO1 VUVLO2 ICE IVOUT VCEH VCEL VTESTL
x0.980
0.784 0.800 150 0.75 70 1.00 140 0.0 -5.0 0.0 0.20 0.20 100 0.5 0.1 1.0 2.10 2.20 -0.1 -0.1 1.5 1.0 2.0 1.4 2.25 VUVLO1 +0.10 0.0 0.0
x1.020
0.816
V
V ppm/ C
Topt
< =
85C
VIN=VCE =VSET +1.5V VIN=VCE =5.5V, VOUT=5.5V VCE=VOUT=0V, VIN= 5.5V VIN=5.5V,VCE=0V VLX=0V/5.5V
1.25 190 5.0 5.0 0.35 0.35 1.4 10.0 2.40 2.50 0.1 0.1
MHz A A A % ms ms A V V A A V
ON Resistance of Pch Transistor VIN=5.0V, ILX=200mA ON Resistance of Nch Transistor VIN=5.0V, ILX=200mA Oscillator Maximum Duty Cycle Soft-start Time Protection Delay Time Lx Current Limit UVLO Detector Threshold UVLO Released Voltage CE Input Current VOUT Leakage Current CE "H" Input Voltage CE "L" Input Voltage TEST pin "L" Input Voltage VIN=VCE =5.0V, at no load VIN=VCE =5.0V VIN=VCE =5.0V VIN=VCE =2.6V-> 1.5V VIN=VCE =1.5V-> 2.6V VIN=5.5V, VCE =5.5V/0V VIN=5.5V, VCE =0V, VOUT=5.5V/0V VIN=5.5V VIN=3.0V VIN=3.0V
0.3 0.3
V V
5
R1232D
*
R1232DxxxB/D
Topt=25C
Symbol VIN VOUT VFB VOUT/Topt fosc IDD Istandby ILXleak RONP RONN Maxduty tstart tprot ILXlimit VUVLO1 VUVLO2 ICE IVOUT VCEH VCEL VTESTL
Item Operating Input Voltage Step-down Output Voltage Feedback Voltage Step-down Output Voltage Temperature Coefficient Oscillator Frequency Supply Current Standby Current LX Leakage Current
Conditions VIN=VCE=5.0V,IOUT=10mA VIN=VCE=5.0V,IOUT=10mA -40C
< = < =
Min. 2.6 x0.980 0.784
Typ.
Max. 5.5 x1.020
Unit V V V ppm/ C
0.800 150
0.816
Topt
85C 1.91 170
VIN=VCE=VSET+1.5V VIN=VCE=5.5V, VOUT=5.5V VCE=VOUT=0V, VIN=5.5V VIN=5.5V, VCE=0V, VLX=0V/5.5V
2.25 240 0.0
2.58 310 5.0 5.0 0.35 0.35 0.7 10.0 2.40 2.50 0.1 0.1
MHz A A A % ms ms A V V A A V
-5.0
0.0 0.20 0.20
ON Resistance of Pch Transistor VIN=5.0V, ILX=200mA ON Resistance of Nch Transistor VIN=5.0V, ILX=200mA Oscillator Maximum Duty Cycle Soft-start Time Protection Delay Time LX Current Limit UVLO Detector Threshold UVLO Released Voltage CE Input Current VOUT Leakage Current CE "H" Input Voltage CE "L" Input Voltage TEST "L" Input Voltage VIN=VCE=5.0V, at no load VIN=VCE=5.0V VIN=VCE=5.0V VIN=VCE=2.6V -> 1.5V VIN=VCE =1.5V -> 2.6V VIN=5.5V, VCE =5.5V/0V VIN=5.5V, VCE=0V, VOUT=5.5V/0V VIN=5.5V VIN=3.0V VIN=3.0V 100 0.15 0.1 1.0 2.10 2.20 -0.1 -0.1 1.5
0.4 2.0 1.4 2.25 VUVLO1 +0.10 0.0 0.0
0.3 0.3
V V
6
R1232D
TEST CIRCUIT
PGND VIN VDD CE LX AGND TEST VFB
A
Test Circuit for Input Current and Leakage Current
PGND VIN VDD
LX AGND TEST VFB
PGND VIN VDD CE
LX AGND TEST VFB
V
A
CE
Test Circuit for Supply Current and Standby Current
Test Circuit for ON resistance of LX
PGND VIN VDD CE
LX AGND TEST VFB
OSCILLOSCOPE
Input Voltage, Output Voltage, Frequency, Lx Current Limit, Protection Delay Time, UVLO Voltage Test Circuit
PGND VIN VDD CE LX AGND TEST VFB
OSCILLOSCOPE
Soft Start Time Test Circuit The bypass capacitor between power supply and GND is a ceramic capacitor 10F.
7
R1232D
TYPICAL APPLICATION AND TECHNICAL NOTES
*
Fixed Output Voltage Type
L
PGND LX
VOUT
CIN
VIN VDD CE AGND TEST VFB
LOAD COUT
*
Adjustable Output Type
L
PGND LX
VOUT
CIN
VIN VDD CE AGND TEST VFB
LOAD COUT Cb R1 R2
CIN COUT L
10F C2012JB0J106MT (TDK), 10F CM21B106M06AB (Kyocera) 10F C2012JB0J106MT (TDK), 10F CM21B106M06AB (Kyocera) 4.7H/2.7H VLP5610-4R7MR90, VLP5610-2R7M1R0 (TDK) *2.2H is also suitable for B version.
In terms of setting R1, R2, Cb, refer to the technical notes.
8
R1232D
When you use these ICs, consider the following issues; * Input the same voltage into power supply pins, VIN and VDD. Set the same level as AGND and PGND. * When you control the CE pin by another power supply, do not make its "H" level more than the voltage level of VIN / VDD pin. * Set external components such as an inductor, CIN, COUT as close as possible to the IC, in particular, minimize the wiring to VIN pin and PGND pin. * At stand by mode, (CE="L"), the LX output is Hi-Z, or both P-channel transistor and N-channel transistor of LX pin turn off. * In terms of the protection circuits, current limit for the peak current of each cycle of Lx, and the latch protection circuit, which works if the over-limit current flows continuously for a certain time exist. To release the protection, once make this IC into be standby mode with chip enable pin, or make the supply voltage be down to UVLO threshold level or less. * Reinforce the VIN, PGND, and VOUT lines sufficiently. Large switching current may flow in these lines. If the impedance of VIN and PGND lines is too large, the internal voltage level in this IC may shift caused by the switching current, and the operation might be unstable. * Connect the TEST Pin to the "L" or GND level. The performance of power source circuits using these ICs extremely depends upon the peripheral circuits. Pay attention in the selection of the peripheral circuits. In particular, design the peripheral circuits in a way that the values such as voltage, current, and power of each component, PCB patterns and the IC do not exceed their respected rated values.
9
R1232D
OPERATION of step-down DC/DC converter and Output Current
The step-down DC/DC converter charges energy in the inductor when LX transistor is ON, and discharges the energy from the inductor when LX transistor is OFF and controls with less energy loss, so that a lower output voltage than the input voltage is obtained. The operation will be explained with reference to the following diagrams:
i1 Lx Tr VIN SD L i2 CL IOUT VOUT

Step 1: P-channel Tr. turns on and current IL (=i1) flows, and energy is charged into CL. At this moment, IL increases from Ilmin (=0) to reach ILmax in proportion to the on-time period (ton) of P-channel Tr. Step 2: When P-channel Tr. turns off, Synchronous rectifier N-channel Tr. turns on in order that L maintains IL at ILmax, and current IL (=i2) flows. Step 3: IL (=i2) decreases gradually and reaches IL=ILmin=0 after a time period of topen, and N-channel Tr. Turns off. Provided that in the continuous mode, next cycle starts before IL becomes to 0 because toff time is not enough. In this case, IL value increases from this Ilmin (>0). In the case of PWM control system, the output voltage is maintained by controlling the on-time period (ton), with the oscillator frequency (fosc) being maintained constant.
*
Continuous Conduction Mode
The maximum value (ILmax) and the minimum value (ILmin) of the current flowing through the inductor are the same as those when P-channel Tr. turns on and off. The difference between ILmax and ILmin, which is represented by I; I=ILmax-ILmin=VOUTxtopen/L=(VIN-VOUT)xton/L ........................................................Equation 1 Where, t=1/fosc=ton+toff duty (%)=ton/tx100=tonxfoscx100 topen < toff = In Equation 1, VOUTxtopen/L and (VIN-VOUT) xton/L are respectively shown the change of the current at ON, and the change of the current at OFF. Even if the output current (IOUT) is, topen < toff as illustrated in the above diagram is not realized with this IC. At least, topen is equal toff (topen=toff), and when IOUT is further increased, ILmin becomes larger than zero (ILmin>0). The mode is referred to as the continuous mode.
10
R1232D
In the continuous mode, when Equation 1 is solved for ton and assumed that the solution is tonc tonc=txVOUT/VIN............................................................................................................. Equation 2 When the ton=tonc, the mode is the continuous mode.
OUTPUT CURRENT AND SELECTION OF EXTERNAL COMPONENTS
When P-channel Tr. of LX is ON: (Wherein, Ripple Current P-P value is described as IRP, ON resistance of P-channel Tr. and N-channel Tr. of LX are respectively described as RONP and RONN, and the DC resistor of the inductor is described as RL.) VIN=VOUT+(RONP+RL)xIOUT+LxIRP/ton .............................................................................. Equation 3 When P-channel Tr. of LX is "OFF"(N-channel Tr. is "ON"): LxIRP/toff=VF+VOUT+RONNxIOUT ....................................................................................... Equation 4 Put Equation 4 to Equation 3 and solve for ON duty of P-channel transistor, Don=ton/(toff+ton), DON=(VOUT-RONNxIOUT+RLxIOUT)/(VIN+RONNxIOUT-RONPxIOUT) ........................................... Equation 5 Ripple Current is as follows; IRP=(VIN-VOUT-RONPxIOUT-RLxIOUT)xDON/fosc/L .............................................................. Equation 6 wherein, peak current that flows through L, and LX Tr. is as follows; ILmax=IOUT+IRP/2 .......................................................................................................... Equation 7 Consider ILmax, condition of input and output and select external components. The above explanation is directed to the calculation in an ideal case in continuous mode.
11
R1232D
How to Adjust Output Voltage and about Phase Compensation
As for Adjustable Output type, feedback pin (VFB) voltage is controlled to maintain 0.8V. Output Voltage, VOUT is as following equation; VOUT R1+R2=VFB:R2 VOUT=VFBx(R1+R2)/R2 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. In this case, the phase margin of the system will be less and stability will be worse. To prevent this, phase margin should be secured with proceeding the phase. A pole is formed with external components L and COUT.
fpole ~ 1/2 LCOUT
A zero (signal back to zero) is formed with R1 and Cb. fzero ~ 1/(2pxR1xCb) First, choose the appropriate value of R1, R2 and Cb. Set R1+R2 value 100k or less. For example, if L=4.7H, COUT =10F, the cut off frequency of the pole is approximately 23kHz. To make the cut off frequency of the zero by R1, R2, and Cb be higher than 23kHz, set R1=33k and Cb=100pF.If VOUT is set at 2.0V, R2=22k is appropriate.
12
R1232D
External Components
1.Inductor
Select an inductor that peak current does not exceed ILmax. If larger current than allowable current flows, magnetic saturation occurs and makes transform efficiency be worse. Supposed that the load current is at the same, the smaller value of L is used, the larger the ripple current is. Provided that the allowable current is large in that case and DC current is small, therefore, for large output current, efficiency is better than using an inductor with a large value of L and vice versa.
2.Capacitor
As for CIN, use a capacitor with low ESR (Equivalent Series Resistance) Ceramic type of a capacity at least 10F for stable operation. COUT can reduce ripple of the output voltage, therefore as much as 10F ceramic type is recommended.
TIMING CHART
CE pin Voltage Output Short Intemal Opertional Intemal Soft-start Set Voltage Amplifier Output Output Short
Intemal Oscillator Waveform Lx Pin Output Latched Soft-start Time Stable Delay Time of Protection
The timing chart as shown above describes the waveforms starting from the IC is enabled with CE and latched with protection. During the soft-start time, until the level is rising up to the internal soft-start set voltage, the duty cycle of LX is gradually wider and wider to prevent the over-shoot of the voltage. During the term, the output of amplifier is "H". After the output voltage reaches the set output voltage, they are balanced well. Herein, if the output pin would be short circuit, the output of amplifier would become "H" again, and the condition would continue for 2.0ms (Typ.), latch circuit would work and the output of LX would be latched with "OFF". (Output ="High-Z") If the output short is released before the latch circuit works (within 2ms after output shorted), the output of amplifier is balanced in the stable state again. Once the IC is latched, to release the protection, input "L" with CE pin, or make the supply voltage at UVLO level or less.
13
R1232D
TYPICAL CHARACTERISTICS
1) Output Voltage vs. Output Current (CIN = 10F, COUT = 10F)
R1232D121A
1.300 VIN=5.0V 3.400
R1232D331A
VIN=5.0V
Output Voltage VOUT(V)
1.250 1.200 1.150 1.100 1 10 100 Output Current IOUT(mA) 1000
Output Voltage VOUT(V)
3.350 3.300 3.250 3.200 1 10 100 Output Current IOUT(mA) 1000
R1232D121B
1.300 VIN=5.0V 3.400
R1232D331B
VIN=5.0V
Output Voltage VOUT(V)
1.250 1.200 1.150 1.100 1 10 100 Output Current IOUT(mA) 1000
Output Voltage VOUT(V)
3.350 3.300 3.250 3.200 1 10 100 Output Current IOUT(mA) 1000
2) Efficiency vs. Output Current (CIN = 10F, COUT = 10F)
R1232D121A
100 90 80 70 60 50 40 30 20 10 0 1 VIN=3.3V, 5.0V 100 90 80 70 60 50 40 30 20 10 0 1
R1232D331A
VIN=5.0V
Efficiency(%)
(VIN=5.0V) (VIN=3.3V) 10 100 Output Current IOUT(mA) 1000
Efficiency(%)
10 100 Output Current IOUT(mA)
1000
R1232D121B 14
R1232D331B
R1232D
100 90 80 70 60 50 40 30 20 10 0 1 VIN=3.3V, 5.0V 100 90 80 70 60 50 40 30 20 10 0 1 VIN=5.0V
Efficiency(%)
(VIN=5.0V) (VIN=3.3V) 10 100 Output Current IOUT(mA) 1000
Efficiency(%)
10 100 Output Current IOUT(mA)
1000
3) Output Waveform
R1232D121A
0.04 VIN=5.0V, IOUT=600mA 0.04
R1232D331A
VIN=5.0V, IOUT=600mA
Output Ripple Voltage(V)
0.02 0.01 0 -0.01 -0.02 -0.03 -0.04 -3 -2 -1 0 1 Time t(ns) 2 3
Output Ripple Voltage(V)
0.03
0.03 0.02 0.01 0 -0.01 -0.02 -0.03 -0.04 -3 -2 -1 0 1 Time t(ns) 2 3
R1232D121B
0.06 VIN=5.0V, IOUT=600mA 0.04
R1232D331B
VIN=5.0V, IOUT=600mA
Output Ripple Voltage(V)
0.04 0.02 0 -0.02 -0.04 -0.06 -1.5 -1.0 -0.5 0 0.5 Time t(ns) 1.0 1.5
Output Ripple Voltage(V)
0.03 0.02 0.01 0 -0.01 -0.02 -0.03 -0.04 -1.5 -1.0 -0.5 0 0.5 Time t(ns) 1.0 1.5
15
R1232D
4) Load Transient Response
R1232D121A
0.8 VIN=5.0V 0.5 0.8
R1232D121A
VIN=5.0V 0.8 0.6 Output Current 600mA10mA 0.5 0.4 0.3 Output Voltage 0.2 0.1 0 -50 0 50 100 Time t (s) 150 -0.1 200
Output Voltage VOUT(V)
0.4 0.2 0
Output Current 10mA600mA
0.3 0.2 0.1 0 -0.1
0.4 0.2 0
Output Voltage -50 0 50 100 Time t (s) 150
-0.2 -0.3 200
R1232D121B
0.8 VIN=5.0V 0.5 0.8
R1232D121B
VIN=5.0V 0.8 0.6 Output Current 600mA10mA 0.5 0.4 0.3 Output Voltage 0.2 0.1 0 -50 0 50 100 Time t (s) 150 -0.1 200
Output Voltage VOUT(V)
0.4 0.2 0
Output Current 10mA600mA
0.3 0.2 0.1 0 -0.1 -0.2
0.4 0.2 0
Output Voltage
-50
0
50 100 Time t (s)
150
-0.3 200
5) Output Voltage vs. Input Voltage
R1232D121A
1.22 IOUT=600mA 3.32
R1232D331A
IOUT=600mA
Output Voltage VOUT(V)
1.21 1.20 1.19 1.18 2.5
Output Voltage VOUT(V)
3.31 3.30 3.29 3.28 3.0
3.0
3.5 4.0 4.5 5.0 Input Voltage VIN(V)
5.5
6.0
3.5
4.0 4.5 5.0 5.5 Input Voltage VIN(V)
6.0
6) Oscillator Frequency vs. Input Voltage
R1232D121A R1232D121B
16
Output Voltage VOUT(V)
Output Current IOUT(A)
Output Current IOUT(A)
0.6
0.4
0.6
0.7
Output Voltage VOUT(V)
Output Current IOUT(A)
Output Current IOUT(A)
0.6
0.4
0.6
0.7
R1232D
1.10 IOUT=600mA 2.4 IOUT=600mA
Frequency fosc(MHz)
1.05 1.00 0.95 0.90 2.5
Frequency fosc(MHz)
3.0 3.5 4.0 4.5 5.0 Input Voltage VIN(V) 5.5 6.0
2.3 2.2 2.1 2.0 2.5
3.0
3.5 4.0 4.5 5.0 Input Voltage VIN(V)
5.5
6.0
7) Lx Transistor On Resistance vs. Input Voltage
Switching Tr. Pch on Resistance
0.14 0.13 0.12 0.11 0.10 0.09 2.5 IOUT=200mA
Synchronous Rectifier Tr. Nch on Resistance
0.14 0.13 0.12 0.11 0.10 0.09 2.5 IOUT=200mA
on Resistance()
3.0
3.5 4.0 4.5 5.0 Input Voltage VIN(V)
5.5
6.0
on Resistance()
3.0
3.5 4.0 4.5 5.0 Input Voltage VIN(V)
5.5
6.0
8) Turn-on speed by CE pin
R1232D121A
VIN=5.0V, L=4.7H Rload=0
R1232D121A
VIN=5.0V, L=4.7H Rload=12
CE 5V/div VOUT 1V/div IL 200mA/div 200s/div
CE 5V/div VOUT 1V/div IL 200mA/div 200s/div
R1232D331B
R1232D331B
17
R1232D
VIN=5.0V, L=2.7H Rload=0 VIN=5.0V, L=2.7H Rload=33
CE 5V/div VOUT 1V/div IL 200mA/div 100s/div
CE 5V/div VOUT 1V/div IL 200mA/div 100s/div
9) Output Voltage vs. Temperature
R1232D121A
1.24 VIN=5.0V 3.40
R1232D331A
VIN=5.0V
Output Voltage VOUT(V)
1.22 1.20 1.18 1.16 1.14 -40
Output Voltage VOUT(V)
-15 10 35 60 Temperature Topt(C) 85
3.35 3.30 3.25 3.20 -40
-15 10 35 60 Temperature Topt(C)
85
10) Oscillator Frequency vs. Temperature
R1232D121A
1.30 VIN=5.0V 2.50
R1232D331B
VIN=5.0V
Frequency fOCS(MHz)
1.10 1.00 0.90 0.80 0.70 -40 -15 10 35 60 Temperature Topt(C) 85
Frequency fOCS(MHz)
1.20
2.40 2.30 2.20 2.10 2.00 -40
-15 10 35 60 Temperature Topt(C)
85
18
R1232D
11) Supply Current vs. Temperature
R1232D121A
130 VIN=5.0V 230
R1232D331B
VIN=5.0V
Supply Current IDD1(A)
125 120 115 110 -40
Supply Current IDD1(A)
-15 10 35 60 Temperature Topt(C) 85
225 220 215 210 -40
-15 10 35 60 Temperature Topt(C)
85
12) Soft-start time vs. Temperature
R1232D121A
1300 VIN=5.0V, Rload=0 600
R1232D331B
VIN=5.0V, Rload=0
Soft-start Time tstart(ms)
Soft-start Time tstart(ms)
-15 10 35 60 Temperature Topt(C) 85
550 500 450 400 350 300 -40 -15 10 35 60 Temperature Topt(C) 85
1100 900 700 500 -40
13) UVLO Voltage vs. Temperature
R1232D121A
UVLO Released Voltage UVLO02(V) UVLO Detector Voltage UVLO01(V)
2.40 2.50
R1232D121A
2.30
2.40
2.20
2.30
2.10 -40
-15 10 35 60 Temperature Topt(C)
85
2.20 -40
-15 10 35 60 Temperature Topt(C)
85
19
R1232D
14) CE Input Voltage vs. Temperature R1232D121A
1.5 VIN=5.0V, CE=H Threshold 1.5
R1232D121A
VIN=5.0V, CE=L Threshold
CE Input Voltage "H" VCEH(V)
1.3 1.0 0.8 0.5 -40
CE Input Voltage "L" VCEL(V)
-15 10 35 60 Temperature Topt(C) 85
1.3 1.0 0.8 0.5 -40
-15 10 35 60 Temperature Topt(C)
85
15) TEST Input Voltage vs. Temperature
R1232D121A
1.5 VIN=5.0V
TEST Input Voltage VTESTL(V)
1.3 1.0 0.8 0.5 -40
-15 10 35 60 Temperature Topt(C)
85
16) Lx Transistor On Resistance vs. Temperature
Driver Tr. Pch ON Resistance
Nch. Lx Transistor On Resistance RONN() Pch. Lx Transistor On Resistance RONP()
0.30 VIN=5.0V
Rectifier Tr.Nch ON Resistance
0.30 VIN=5.0V
0.20
0.20
0.10
0.10
0.00 -40
-15 10 35 60 Temperature Topt(C)
85
0.00 -40
-15 10 35 60 Temperature Topt(C)
85
20
R1232D
17) Current Limit vs. Temperature
R1232D121A
-0.80 VIN=5.0V -0.80
R1232D331B
VIN=5.0V
Lx Current Limit ILXlimit(A)
-1.05 -1.30 -1.55 -1.80 -40
Lx Current Limit ILXlimit(A)
-15 10 35 60 Temperature Topt(C) 85
-1.05 -1.30 -1.55 -1.80 -40
-15 10 35 60 Temperature Topt(C)
85
18) Protection Delay Time vs. Temperatures
R1232D121A
Protection Delay Time tprot(ms) Protection Delay Time tprot(ms)
10.0 7.5 5.0 2.5 0.0 -40 VIN=5.0V 6.0 5.0 4.0 3.0 2.0 1.0 0.0 -40 -15 10 35 60 Temperature Topt(C) 85
R1232D331B
VIN=5.0V
-15 10 35 60 Temperature Topt(C)
85
21
PACKAGE INFORMATION
PE-SON-8-0510
*
SON-8
Unit: mm
PACKAGE DIMENSIONS
2.90.2 0.475TYP 8 5
0.230.1 0.20.1
Bottom View 0.130.05 0.15 +0.1 -0.15 0.15 +0.1 -0.15
2.80.2 3.00.2
1
4 Attention : Tab suspension leads in the parts have VDD or GND level. (They are connected to the reverse side of this IC.) Refer to PIN DISCRIPTION. Do not connect to other wires or land patterns.
0.130.05
0.65 0.30.1
0.1 0.1 M
TAPING SPECIFICATION
0.20.1 +0.1 1.5 0 4.00.1 2.00.05
0.9MAX.
3.50.05
1.10.1
0 180 -1.5 60 +1 0
1.750.1
3.3 2.0MAX. 4.00.1
TR User Direction of Feed
TAPING REEL DIMENSIONS
(1reel=3000pcs)
11.41.0 9.00.3
130.2
210.8
20.5
8.00.3
3.2
0.20.1
PACKAGE INFORMATION
PE-SON-8-0510
POWER DISSIPATION (SON-8)
This specification is at mounted on board. Power Dissipation (PD) depends on conditions of mounting on board. This specification is based on the measurement at the condition below: Measurement Conditions Standard Land Pattern Environment Board Material Board Dimensions Copper Ratio Through-hole Measurement Result
(Topt=25C,Tjmax=125C)
Mounting on Board (Wind velocity=0m/s) Glass cloth epoxy plactic (Double sided) 40mm x 40mm x 1.6mm Top side : Approx. 50% , Back side : Approx. 50% 0.5mm x 44pcs
Standard Land Pattern Power Dissipation Thermal Resistance
600
Free Air 300mW 333C/W
480mW ja=(125-25C)/0.48W=208C/W
Power Dissipation PD(mW)
500 400 300
480
On Board
40
Free Air
100 0 0 25 50 75 85 100 Ambient Temperature (C) 125 150
Power Dissipation
40
200
Measurement Board Pattern IC Mount Area (Unit : mm)
RECOMMENDED LAND PATTERN
0.35 0.65
1.15
0.65
(Unit: mm)
MARK INFORMATION
ME-R1232D-0510
R1232D SERIES MARK SPECIFICATION * SON-8
1 5
to ,
6
4
: Product Code (refer to Part Number vs. Product Code) : Lot Number
1
2
3
4
R
5
6
*
Part Number vs. Product Code
Product Code
1 2 3 4
Part Number R1232D091A R1232D101A R1232D111A R1232D121A R1232D131A R1232D141A R1232D151A R1232D161A R1232D171A R1232D181A R1232D191A R1232D201A R1232D211A R1232D221A R1232D231A R1232D241A R1232D251A R1232D261A R1232D271A R1232D281A R1232D291A R1232D301A R1232D311A R1232D321A R1232D331A
Part Number R1232D091B R1232D101B R1232D111B R1232D121B R1232D131B R1232D141B R1232D151B R1232D161B R1232D171B R1232D181B R1232D191B R1232D201B R1232D211B R1232D221B R1232D231B R1232D241B R1232D251B R1232D261B R1232D271B R1232D281B R1232D291B R1232D301B R1232D311B R1232D321B R1232D331B
Product Code
1 2 3 4
Part Number R1232D001C R1232D001D
Product Code
1 2 3 4
K K K K K K K K K K K K K K K K K K K K K K K K K
0 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3 3 3
9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3
A A A A A A A A A A A A A A A A A A A A A A A A A
K K K K K K K K K K K K K K K K K K K K K K K K K
0 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3 3 3
9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3
B B B B B B B B B B B B B B B B B B B B B B B B B
K K
0 0
1 1
C D

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