R1232D291A-TR [RICOH]
暂无描述;型号: | R1232D291A-TR |
厂家: | RICOH ELECTRONICS DEVICES DIVISION |
描述: | 暂无描述 转换器 |
文件: | 总24页 (文件大小:844K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
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 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. 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. 4.7µH for 1MHz/2.2µH for 2.25MHz)
•
Built-in Driver ON Resistance .......................................P-channel 0.2Ω (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
7
VIN
2
8
Slope
Current Limit
Compensation
5
4
VOUT
Phase
Compensation
Q
R
Vref
S
PWM
Output
Contorol
Error
LX
Comparator
Amplifer
CE
Oscillator
Soft Start
UVLO
“H” Active
TEST Circuit
Chip Enable
1
6
“L” or GND Fixed
PGND
TEST
R1232D001C/D
VDD
AGND
3
7
VIN
2
8
Slope
Current Limit
Compensation
5
4
VFB
Phase
Compensation
Q
R
Vref
S
PWM
Output
Error
LX
Comparator
Contorol
Amplifer
CE
Oscillator
Soft Start
UVLO
“H” Active
TEST Circuit
Chip Enable
1
6
“L” or GND Fixed
PGND
TEST
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 b c
d
e
Code
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.)
a
b
1: fixed
Designation of Optional Function
A: 1MHz, Fixed Output Voltage
c
B: 2.25MHz, Fixed Output Voltage
C: 1MHz, Adjustable Output Voltage
D: 2.25MHz, Adjustable Output Voltage
Designation of Taping Type;
d
e
(Refer to Taping Specification)"TR" is prescribed as a standard.
Designation of Composition of pin plating
-F : Lead free plating
3
R1232D
PIN CONFIGURATION
SON-8
Top View
Bottom View
8
7
6
5
5
6
7
8
∗
∗
∗
1
2
3
4
4
3
2
1
PIN DESCRIPTIONS
Pin No
Symbol
PGND
VIN
Pin Description
1
2
3
4
5
6
7
8
Ground Pin
Voltage Supply Pin
Voltage Supply Pin
VDD
CE
Chip Enable Pin (active with "H")
Output/Feedback Pin
VOUT/VFB
TEST
AGND
LX
Test Pin (Forced to the "L" or GND level.)
Ground Pin
LX Switching Pin (CMOS Output)
∗ 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
Item
Rating
6.5
Unit
V
VIN
VIN Supply Voltage
VDD Pin Voltage
VDD
6.5
V
VLX
LX Pin Voltage
V
−0.3 to VIN + 0.3
−0.3 to VIN + 0.3
−0.3 to VIN + 0.3
−0.3 to VIN + 0.3
VCE
CE Pin Input Voltage
TEST Pin Input Voltage
VFB Pin Input Voltage
LX Pin Output Current
Power Dissipation (SON-8)*1
Operating Temperature Range
Storage Temperature Range
V
VTEST
VFB
V
V
ILX
V
±1.5
480
PD
mW
°C
°C
Topt
Tstg
−40 to 85
−55 to 125
∗1) For the power dissipation, refer to the package information on the website.
4
R1232D
ELECTRICAL CHARACTERISTICS
• R1232DxxxA/C
Topt=25°C
Unit
Symbol
Item
Conditions
Min.
Typ. Max.
VIN
Operating Input Voltage
2.6
5.5
V
VIN=VCE=5.0V, IOUT=10mA
VIN=VCE=5.0V, IOUT=10mA
Step-down Output Voltage
Feedback Voltage
V
VFB
OUT
×0.980
0.784 0.800 0.816
×1.020
V
V
ppm/
°C
Step-down Output Voltage
∆VOUT/∆Topt
−40°C Topt 85°C
±150
=
=
Temperature Coefficient
fosc
IDD
Istandby
Oscillator Frequency
Supply Current
Standby Current
0.75
70
1.00
140
0.0
1.25
190
5.0
MHz
µA
µA
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
ILXleak
LX Leakage Current
0.0
5.0
−5.0
µA
RONP
RONN
ON Resistance of Pch Transistor
ON Resistance of Nch Transistor
Oscillator Maximum Duty Cycle
Soft-start Time
0.20
0.20
0.35
0.35
VIN=5.0V, ILX=200mA
VIN=5.0V, ILX=200mA
Ω
Ω
Maxduty
tstart
100
0.5
%
ms
1.0
2.0
1.4
VIN=VCE =5.0V, at no load
VIN=VCE =5.0V
tprot
Protection Delay Time
0.1
10.0
ms
A
ILXlimit
VUVLO1
Lx Current Limit
1.0
1.4
VIN=VCE =5.0V
UVLO Detector Threshold
2.10
2.25
VUVLO1
+0.10
2.40
2.50
0.1
V
VIN=VCE =2.6V-> 1.5V
VUVLO2
ICE
UVLO Released Voltage
CE Input Current
2.20
−0.1
−0.1
1.5
V
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
µA
µA
0.0
IVOUT
VOUT Leakage Current
0.0
0.1
VCEH
VCEL
CE "H" Input Voltage
CE "L" Input Voltage
V
V
V
0.3
0.3
VTESTL
TEST pin "L" Input Voltage
5
R1232D
• R1232DxxxB/D
Topt=25°C
Symbol
Item
Conditions
Min.
2.6
×0.980
Typ. Max.
5.5
Unit
V
V
VIN
VOUT
VFB
Operating Input Voltage
Step-down Output Voltage
Feedback Voltage
VIN=VCE=5.0V,IOUT=10mA
VIN=VCE=5.0V,IOUT=10mA
×1.020
0.784 0.800 0.816
V
ppm/
°C
Step-down Output Voltage
∆VOUT/∆Topt
−40°C Topt 85°C
±150
=
=
Temperature Coefficient
fosc
IDD
Istandby
Oscillator Frequency
Supply Current
Standby Current
1.91
170
2.25
240
0.0
2.58
310
5.0
MHz
µA
µA
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
ILXleak
LX Leakage Current
0.0
5.0
−5.0
µA
RONP
RONN
ON Resistance of Pch Transistor
ON Resistance of Nch Transistor
Oscillator Maximum Duty Cycle
Soft-start Time
0.20
0.20
0.35
0.35
VIN=5.0V, ILX=200mA
VIN=5.0V, ILX=200mA
Ω
Ω
Maxduty
tstart
100
0.15
0.1
%
ms
0.4
2.0
0.7
VIN=VCE=5.0V, at no load
VIN=VCE=5.0V
tprot
Protection Delay Time
10.0
ms
A
ILXlimit
VUVLO1
LX Current Limit
1.0
1.4
VIN=VCE=5.0V
UVLO Detector Threshold
2.10
2.25
VUVLO1
+0.10
2.40
2.50
0.1
V
VIN=VCE=2.6V -> 1.5V
VUVLO2
ICE
UVLO Released Voltage
CE Input Current
2.20
−0.1
−0.1
1.5
V
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
µA
µA
0.0
IVOUT
VOUT Leakage Current
0.0
0.1
VCEH
VCEL
CE "H" Input Voltage
CE "L" Input Voltage
TEST "L" Input Voltage
V
V
V
0.3
0.3
VTESTL
6
R1232D
TEST CIRCUIT
PGND
VIN
LX
A
AGND
VDD
CE
TEST
VFB
Test Circuit for Input Current and Leakage Current
PGND
VIN
LX
PGND
VIN
LX
V
AGND
AGND
VDD
CE
VDD
CE
TEST
VFB
TEST
VFB
A
Test Circuit for Supply Current and Standby Current
Test Circuit for ON resistance of LX
PGND
VIN
LX
OSCILLOSCOPE
AGND
VDD
CE
TEST
VFB
Input Voltage, Output Voltage, Frequency, Lx Current Limit,
Protection Delay Time, UVLO Voltage Test Circuit
PGND
VIN
LX
OSCILLOSCOPE
AGND
VDD
CE
TEST
VFB
Soft Start Time Test Circuit
The bypass capacitor between power supply and GND is a ceramic capacitor 10µF.
7
R1232D
TYPICAL APPLICATION AND TECHNICAL NOTES
• Fixed Output Voltage Type
L
OUT
V
PGND
LX
CIN
VIN
VDD
CE
AGND
LOAD
OUT
C
TEST
VFB
• Adjustable Output Type
L
OUT
V
PGND
LX
CIN
VIN
VDD
CE
AGND
LOAD
OUT
C
TEST
VFB
Cb
R1
R2
CIN
COUT
10µF C2012JB0J106MT (TDK), 10µF CM21B106M06AB (Kyocera)
10µF C2012JB0J106MT (TDK), 10µF CM21B106M06AB (Kyocera)
4.7µH/2.7µH VLP5610-4R7MR90, VLP5610-2R7M1R0 (TDK)
*2.2µH is also suitable for B version.
L
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:
<Basic Circuits>
<Current through L>
i1
OUT
I
L
Lx Tr
SD
OUT
V
IN
V
i2
CL
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=VOUT×topen/L=(VIN−VOUT)×ton/L ........................................................Equation 1
Where,t=1/fosc=ton+toff
duty (%)=ton/t×100=ton×fosc×100
<
topen toff
=
In Equation 1, VOUT×topen/L and (VIN−VOUT) ×ton/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=t×VOUT/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)×IOUT+L×IRP/ton .............................................................................. Equation 3
When P-channel Tr. of LX is "OFF"(N-channel Tr. is "ON"):
L×IRP/toff=VF+VOUT+RONN×IOUT ....................................................................................... Equation 4
Put Equation 4 to Equation 3 and solve for ON duty of P-channel transistor, Don=ton/(toff+ton),
DON=(VOUT−RONN×IOUT+RL×IOUT)/(VIN+RONN×IOUT−RONP×IOUT) ........................................... Equation 5
Ripple Current is as follows;
IRP=(VIN−VOUT−RONP×IOUT−RL×IOUT)×DON/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.
ÌThe 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=VFB×(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 ~1/2π LCOUT
A zero (signal back to zero) is formed with R1 and Cb.
≅fzero ~ 1/(2p×R1×Cb)
First, choose the appropriate value of R1, R2 and Cb.
Set R1+R2 value 100kΩ or less.
For example, if L=4.7µH, COUT =10µF, 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=33kΩ and Cb=100pF.If VOUT is set at 2.0V, R2=22kΩ 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
10µF for stable operation.
COUT can reduce ripple of the output voltage, therefore as much as 10µF ceramic type is recommended.
TIMING CHART
Output
Short
Output Short
CE pin Voltage
Intemal Opertional Intemal Soft-start
Amplifier Output
Set Voltage
Intemal Oscillator Waveform
Lx Pin Output
Latched
Delay Time of Protection
Soft-start Time
Stable
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 = 10µF, COUT = 10µF)
R1232D121A
R1232D331A
V
IN=5.0V
VIN=5.0V
1.300
1.250
1.200
1.150
1.100
3.400
3.350
3.300
3.250
3.200
1
10
100
1000
1
10
100
1000
Output Current IOUT(mA)
Output Current IOUT(mA)
R1232D121B
R1232D331B
V
IN=5.0V
V
IN=5.0V
1.300
1.250
1.200
1.150
1.100
3.400
3.350
3.300
3.250
3.200
1
10
100
1000
1
10
100
1000
Output Current IOUT(mA)
Output Current IOUT(mA)
2) Efficiency vs. Output Current (CIN = 10µF, COUT = 10µF)
R1232D121A
R1232D331A
VIN=3.3V, 5.0V
VIN=5.0V
100
90
80
70
60
50
40
30
20
10
0
100
90
80
70
60
50
40
30
20
10
0
(VIN=5.0V)
(VIN=3.3V)
1
10
100
1000
1
10
100
1000
Output Current IOUT(mA)
Output Current IOUT(mA)
R1232D121B
R1232D331B
14
R1232D
V
IN=3.3V, 5.0V
VIN=5.0V
100
90
80
70
60
50
40
30
20
10
0
100
90
80
70
60
50
40
30
20
10
0
(VIN=5.0V)
(VIN=3.3V)
1
10
100
1000
1
10
100
1000
Output Current IOUT(mA)
Output Current IOUT(mA)
3) Output Waveform
R1232D121A
R1232D331A
V
IN=5.0V, IOUT=600mA
VIN=5.0V, IOUT=600mA
0.04
0.03
0.02
0.01
0
0.04
0.03
0.02
0.01
0
-0.01
-0.02
-0.03
-0.04
-0.01
-0.02
-0.03
-0.04
-3
-2
-1
0
1
2
3
-3
-2
-1
0
1
2
3
Time t(ns)
Time t(ns)
R1232D121B
R1232D331B
V
IN=5.0V, IOUT=600mA
VIN=5.0V, IOUT=600mA
0.06
0.04
0.02
0
0.04
0.03
0.02
0.01
0
-0.01
-0.02
-0.03
-0.04
-0.02
-0.04
-0.06
-1.5 -1.0 -0.5
0
0.5
1.0
1.5
-1.5 -1.0 -0.5
0
0.5
1.0
1.5
Time t(ns)
Time t(ns)
15
R1232D
4) Load Transient Response
R1232D121A
R1232D121A
V
IN=5.0V
VIN=5.0V
0.8
0.6
0.4
0.5
0.4
0.3
0.2
0.1
0
0.8
0.6
0.4
0.2
0
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
Output Current 10mA→600mA
Output Current 600mA→10mA
0.2
0
Output Voltage
-0.1
-0.2
-0.3
Output Voltage
-0.1
-50
0
50
100
150
200
-50
0
50
100
150
200
Time t (µs)
Time t (µs)
R1232D121B
R1232D121B
V
IN=5.0V
VIN=5.0V
0.8
0.6
0.4
0.2
0
0.5
0.4
0.3
0.2
0.1
0
0.8
0.6
0.4
0.2
0
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
Output Current 10mA→600mA
Output Current 600mA→10mA
Output Voltage
-0.1
-0.2
-0.3
Output Voltage
-0.1
-50
0
50
100
150
200
-50
0
50
100
150
200
Time t (µs)
Time t (µs)
5) Output Voltage vs. Input Voltage
R1232D121A
R1232D331A
I
OUT=600mA
I
OUT=600mA
1.22
1.21
1.20
1.19
1.18
3.32
3.31
3.30
3.29
3.28
2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
3.0
3.5
4.0
4.5
5.0
5.5
6.0
Input Voltage VIN(V)
Input Voltage VIN(V)
6) Oscillator Frequency vs. Input Voltage
R1232D121A
R1232D121B
16
R1232D
I
OUT=600mA
IOUT=600mA
1.10
1.05
1.00
0.95
0.90
2.4
2.3
2.2
2.1
2.0
2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
Input Voltage VIN(V)
Input Voltage VIN(V)
7) Lx Transistor On Resistance vs. Input Voltage
Switching Tr. Pch on Resistance
Synchronous Rectifier Tr. Nch on Resistance
I
OUT=200mA
IOUT=200mA
0.14
0.13
0.12
0.11
0.10
0.09
0.14
0.13
0.12
0.11
0.10
0.09
2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
Input Voltage VIN(V)
Input Voltage VIN(V)
8) Turn-on speed by CE pin
R1232D121A
R1232D121A
VIN=5.0V, L=4.7µH Rload=12Ω
VIN=5.0V, L=4.7µH Rload=0Ω
CE
CE
5V/div
5V/div
VOUT
VOUT
1V/div
1V/div
IL
IL
200mA/div
200mA/div
200µs/div
200µs/div
R1232D331B
R1232D331B
17
R1232D
VIN=5.0V, L=2.7µH Rload=0Ω
VIN=5.0V, L=2.7µH Rload=33Ω
CE
CE
5V/div
5V/div
VOUT
V
OUT
1V/div
1V/div
IL
IL
200mA/div
200mA/div
100µs/div
100µs/div
9) Output Voltage vs. Temperature
R1232D121A
R1232D331A
V
IN=5.0V
VIN=5.0V
1.24
1.22
1.20
1.18
1.16
1.14
3.40
3.35
3.30
3.25
3.20
-40
-15
10
35
60
85
-40
-15
10
35
60
85
Temperature Topt(°C)
Temperature Topt(°C)
10) Oscillator Frequency vs. Temperature
R1232D121A
R1232D331B
V
IN=5.0V
VIN=5.0V
1.30
1.20
1.10
1.00
0.90
0.80
0.70
2.50
2.40
2.30
2.20
2.10
2.00
-40
-15
10
35
60
85
-40
-15
10
35
60
85
Temperature Topt(°C)
Temperature Topt(°C)
18
R1232D
11) Supply Current vs. Temperature
R1232D121A
R1232D331B
V
IN=5.0V
V
IN=5.0V
130
125
120
115
110
230
225
220
215
210
-40
-15
10
35
60
85
-40
-15
10
35
60
85
Temperature Topt(°C)
Temperature Topt(°C)
12) Soft-start time vs. Temperature
R1232D121A
R1232D331B
V
IN=5.0V, Rload=0Ω
VIN=5.0V, Rload=0Ω
1300
1100
900
600
550
500
450
400
350
300
700
500
-40
-15
10
35
60
85
-40
-15
10
35
60
85
Temperature Topt(°C)
Temperature Topt(°C)
13) UVLO Voltage vs. Temperature
R1232D121A
R1232D121A
2.40
2.50
2.40
2.30
2.20
2.30
2.20
2.10
-40
-15
10
35
60
85
-40
-15
10
35
60
85
Temperature Topt(°C)
Temperature Topt(°C)
19
R1232D
14) CE Input Voltage vs. Temperature
R1232D121A
R1232D121A
V
IN=5.0V, CE=H Threshold
VIN=5.0V, CE=L Threshold
1.5
1.3
1.0
0.8
0.5
1.5
1.3
1.0
0.8
0.5
-40
-15
10
35
60
85
-40
-15
10
35
60
85
Temperature Topt(°C)
Temperature Topt(°C)
15) TEST Input Voltage vs. Temperature
R1232D121A
VIN=5.0V
1.5
1.3
1.0
0.8
0.5
-40
-15
10
35
60
85
Temperature Topt(°C)
16) Lx Transistor On Resistance vs. Temperature
Driver Tr. Pch ON Resistance
Rectifier Tr.Nch ON Resistance
V
IN=5.0V
V
IN=5.0V
0.30
0.20
0.10
0.00
0.30
0.20
0.10
0.00
-40
-15
10
35
60
85
-40
-15
10
35
60
85
Temperature Topt(°C)
Temperature Topt(°C)
20
R1232D
17) Current Limit vs. Temperature
R1232D121A
R1232D331B
V
IN=5.0V
V
IN=5.0V
-0.80
-1.05
-1.30
-1.55
-1.80
-0.80
-1.05
-1.30
-1.55
-1.80
-40
-15
10
35
60
85
-40
-15
10
35
60
85
Temperature Topt(°C)
Temperature Topt(°C)
18) Protection Delay Time vs. Temperatures
R1232D121A
R1232D331B
V
IN=5.0V
VIN=5.0V
10.0
7.5
5.0
2.5
0.0
6.0
5.0
4.0
3.0
2.0
1.0
0.0
-40
-15
10
35
60
85
-40
-15
10
35
60
85
Temperature Topt(°C)
Temperature Topt(°C)
21
PE-SON-8-0510
PACKAGE INFORMATION
• SON-8
Unit: mm
PACKAGE DIMENSIONS
2.9 0.2
0.475TYP
8
+0.1
+0.1
0.15
0.15
0.13 0.05
−0.15
−0.15
5
1
4
Bottom View
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.
0.1
0.65
Do not connect to other wires or land patterns.
0.3 0.1
0.1 M
TAPING SPECIFICATION
4.0 0.1
+0.1
0
φ1.5
0.2 0.1
2.0 0.05
3.3
4.0 0.1
2.0MAX.
∅1.1 0.1
TR
User Direction of Feed
TAPING REEL DIMENSIONS
(1reel=3000pcs)
11.4 1.0
9.0 0.3
21 0.8
2 0.5
PE-SON-8-0510
PACKAGE INFORMATION
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
Mounting on Board (Wind velocity=0m/s)
Glass cloth epoxy plactic (Double sided)
40mm × 40mm × 1.6mm
Top side : Approx. 50% , Back side : Approx. 50%
Through-hole
φ0.5mm × 44pcs
Measurement Result
(Topt=25°C,Tjmax=125°C)
Standard Land Pattern
480mW
Free Air
300mW
Power Dissipation
Thermal Resistance
θja=(125−25°C)/0.48W=208°C/W
333°C/W
600
On Board
480
500
40
400
300
200
100
0
Free Air
0
25
50
75 85 100
125
150
Ambient Temperature (°C)
Power Dissipation
Measurement Board Pattern
IC Mount Area (Unit : mm)
RECOMMENDED LAND PATTERN
0.35 0.65
(Unit: mm)
ME-R1232D-0510
MARK INFORMATION
R1232D SERIES MARK SPECIFICATION
• SON-8
1
5
4
to
6
: Product Code (refer to Part Number vs. Product Code)
: Lot Number
,
1
2
3
5
4
6
R
• Part Number vs. Product Code
Product Code
Product Code
Product Code
Part Number
Part Number
Part Number
1
2
3
4
1
2
3
4
1
2
3
4
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
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
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
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
R1232D001C
R1232D001D
K
K
0
0
1
1
C
D
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