R1224N402F-TR-F [RICOH]
Switching Controller, 500kHz Switching Freq-Max, CMOS, PDSO5, ROHS COMPLIANT, SOT-23, 5 PIN;
| 型号： | R1224N402F-TR-F |
| 厂家： | 
RICOH ELECTRONICS DEVICES DIVISION |
| 描述： | Switching Controller, 500kHz Switching Freq-Max, CMOS, PDSO5, ROHS COMPLIANT, SOT-23, 5 PIN 开关 控制器 开关式稳压器 开关式控制器 光电二极管 电源电路 开关式稳压器或控制器 |
| 文件： | 总2页 (文件大小：175K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
R1224N Series
PWM/VFM Step-down DC/DC Controller with Ext. Tr.
The R1224N Series are low supply current CMOS-based PWM/VFM step-down DC/DC controller with an external output transistor.
By simply using a power transistor, an inductor, a diode, and a capacitor as external components, a high-efficiency step-down DC/DC
converter can be easily configured. The PWM/VFM alternative circuit automatically switches to VFM control in the smaller output
current range and provides high efficiency even in the smaller output current range. The version with fixed PWM control and
adjustable output voltage with an external resistor is also available. The reset type protection circuit embedded into the device limits
output current by repeatedly triggering the soft start circuit when the oscillator maximum duty cycle continues for a predetermined
period of time. When the oscillator maximum duty cycle ends, normal operation is resumed automatically. R1224N also includes an
under-voltage lockout circuit (UVLO) that stops DC/DC operation and prevents malfunction when the supply voltage falls below the
UVLO detect voltage and reduces supply current.
FEATURES
• Supply Current (IDD1)·················· Typ. 20
μ
A (E, F, L, M Versions), Typ. 30
μ
A (G Version),
• Output Voltage Accuracy················ ± 2%
Typ. 40
μA (H Version) (VIN=VOUT=18.5V)
• Oscillator Frequency (fosc) ·············· 180kHz, 300kHz, 500kHz
• Standby Current (Istandby) ············ Max. 0.5μA (In standby)
•
··· Min. 100%
• Input Voltage Range (VIN)·········· 2.3V to 18.5V
• OUsVciLllaOtorDMeatxeimctumVoDltuatygCeyc(VleU(MVLaOx)d·u··ty··)···· Typ. 2.0V
• Output Voltage Range (VOUT)····· 1.2V to 6.0V (internally fixed R1224Nxx2E/F/L)
• Soft Start Time (tstart)······················· Typ. 10ms
Externally adjustable (Feedback voltage of 1.0V, R1224Nxx2G/H/M) • Reset Protection Circuit ················· Delay time for protection
Typ. 15ms
• Package ········································· SOT-23-5
BLOCK DIAGRAMS
R1224Nxx2E/F/L
R1224Nxx2G/H/M
(Internally fixed output voltage type)
(Externally adjustable output voltage type)
OSC
OSC
VIN
VIN
5
5
V
OUT
VFB
3
3
-
-
-
-
EXT
4
EXT
4
Amp
Amp
+
+
Vref
Vref
+
+
PWM/VFM
CONTROL
Soft Start
Soft Start
1
1
Chip Enable
CE
Chip Enable
CE
Protection
UVLO
Protection
+
-
+
-
Vref
Vref
UVLO
2
2
GND
GND
SELECTION GUIDE
TYPICAL APPLICATIONS
R1224Nxx2E/F/L
R1224Nxx2G/H/M
Package Quantity per Reel
SOT-23-5 3,000 pcs
Part No.
L
L
R1224N
.
xx.
2.
∗-TR-F
PMOS
PMOS
+
-
C1
R4
C4
R3
4
4
IN EXT
.
xx.
:
Specify the output voltage within the range
C1
5
1
3
IN EXT VOUT
5
1
3
V
VFB
V
1.2V (
.
12
.
) to 6.0V (
.60
.
) in 0.1V steps.
C3
C3
R1
R1
+
-
+
-
SD
SD
CE GND
2
CE GND
2
(For externally adjustable output voltage type, feedback voltage of 1.0V(
.
10
.
))
R2
.
.
:
Specify the oscillator frequency, modulation method, output
voltage adjustment.
∗
C2
C2
.
.
.
.
.
.
E
.
: 300kHz, PWM/VFM, fixed output voltage
: 500kHz, PWM/VFM, fixed output voltage
: 300kHz, fixed PWM, adjustable output voltage
: 500kHz, fixed PWM, adjustable output voltage
: 180kHz, PWM/VFM, fixed output voltage
CE CONTROL
CE CONTROL
F
.
PMOS : HAT1044M, L : 27μH,
SD : RB063L-30, C1 : 10μF, C2 : 0.1μF,
C3 : 47μF, R1 : 10Ω
PMOS : HAT1044M, L : 27μH,
SD : RB063L-30, C1 : 10μF, C2 : 0.1μF,
C3 : 47 F, C4 : 1000pF, R1 : 10 , R3 : 2.7k
Output voltage at 2.5V⋅⋅⋅R2 : 22kΩ, R4 : 33kΩ
G
H
.
.
μ
Ω
Ω,
L
.
M
.
:180kHz, fixed PWM, adjustable output voltage
PACKAGE (Top View)
TYPICAL CHARACTERISTIC
R1224N332E Efficiency vs. Output Current
SOT-23-5
5
4
VIN=7V, L=CDRH127(10μH)
100
90
80
70
60
50
40
30
20
10
0
1
2
3
1
2
3
4
5
CE
GND
VOUT or VFB
EXT
0.1
1
10
100
1000 10000
VIN
Output Current IOUT (mA)
APPLICATIONS
• Power source for hand-held communication equipment, cameras, and VCRs
• Power source for home appliances
• Power source for battery-powered equipment
No.EK-101-091101
Step-down DC/DC Converter
1.The products and the product specifications described in this document are subject to change or
discontinuation of production without notice for reasons such as improvement. Therefore, before
deciding to use the products, please refer to Ricoh sales representatives for the latest
information thereon.
2.The materials in this document may not be copied or otherwise reproduced in whole or in part
without prior written consent of Ricoh.
3.Please be sure to take any necessary formalities under relevant laws or regulations before
exporting or otherwise taking out of your country the products or the technical information
described herein.
4.The technical information described in this document shows typical characteristics of and
example application circuits for the products. The release of such information is not to be
construed as a warranty of or a grant of license under Ricoh's or any third party's intellectual
property rights or any other rights.
5.The products listed in this document are intended and designed for use as general electronic
components in standard applications (office equipment, telecommunication equipment,
measuring instruments, consumer electronic products, amusement equipment etc.). Those
customers intending to use a product in an application requiring extreme quality and reliability,
for example, in a highly specific application where the failure or misoperation of the product
could result in human injury or death (aircraft, spacevehicle, nuclear reactor control system,
traffic control system, automotive and transportation equipment, combustion equipment, safety
devices, life support system etc.) should first contact us.
6.We are making our continuous effort to improve the quality and reliability of our products, but
semiconductor products are likely to fail with certain probability. In order to prevent any injury to
persons or damages to property resulting from such failure, customers should be careful enough
to incorporate safety measures in their design, such as redundancy feature, firecontainment
feature and fail-safe feature. We do not assume any liability or responsibility for any loss or
damage arising from misuse or inappropriate use of the products.
7.Anti-radiation design is not implemented in the products described in this document.
8.Please contact Ricoh sales representatives should you have any questions or comments
concerning the products or the technical information.
RICOH COMPANY., LTD. Electronic Devices Company
■Ricoh awarded ISO 14001 certification.
■
Ricoh presented with the Japan Management Quality Award for 1999.
The Ricoh Group was awarded ISO 14001 certification, which is an international standard for
environmental management systems, at both its domestic and overseas production facilities.
Our current aim is to obtain ISO 14001 certification for all of our business offices.
Ricoh continually strives to promote customer satisfaction, and shares the achievements
of its management quality improvement program with people and society.
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After Apr. 1, 2006, we will ship out the lead free products only. Thus, all products that
will be shipped from now on comply with RoHS Directive.
http://www.ricoh.com/LSI/
RICOH COMPANY, LTD.
Electronic Devices Company
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