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参数资料
| 型号： | R1225N552K-TR-F |
| 厂商： | RICOH COMPANY LTD |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING REGULATOR, PDSO6 |
| 封装： | LEAD FREE, SOT-23, 6 PIN |
| 文件页数： | 1/2页 |
| 文件大小： | 144K |
| 代理商： | R1225N552K-TR-F |
R1225N Series
PWM/VFM Step-down DC/DC Controller with Ext. Tr.
No.EK-102-091101
Step-down DC/DC Converter
The R1225N Series are low supply current CMOS-based PWM/VFM controlled step-down DC/DC controllers 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 is also available.
The latch type protection circuit embedded into the device latches the power MOS in the "OFF" state when the oscillator maximum duty
cycle continues for a predetermined period of time. Protection time is adjustable by the capacity of an external capacitor of the DLY pin.
R1225N also includes an under-voltage lockout circuit (UVLO) that stops DC/DC operation and prevents malfunction when the supply
voltage falls below the UVLO detector threshold and reduces supply current.
FEATURES
Supply Current (I
DD1
) Typ. 20
μA (A, B, J, K Versions), Typ. 30μA (C Version),
Typ. 40
μA (D Version) (VIN=VOUT=18.5V)
Standby Current (I
standby
) Max. 0.5
μA (In standby)
Input Voltage Range (V
IN
) 2.3V to 18.5V
Output Voltage Range (V
OUT
) 1.2V to 6.0V (internally fixed)
Output Voltage Accuracy ± 2%
Oscillator Frequency (f
osc
)180kHz, 300kHz, 500kHz
Oscillator Maximum Duty Cycle (Maxduty)Min. 100%
UVLO Detect Voltage (V
UVLO
)Typ. 2.0V
Soft Start Time (t
start
)Typ. 10ms
Latch Type Protection CircuitDelay time for protection
Typ. 20ms
PackageSOT-23-6W
BLOCK DIAGRAM
R1225Nxx2x
VIN 2
1
VOUT
CE
EXT
DLY
GND
PWM/VFM
CONTROL
Start
func
+
-
+
-
Amp
OSC
Vref
Protection
Soft Start
Chip Enable
+
-
UVLO
3
5
4
6
SELECTION GUIDE
TYPICAL APPLICATION
Package
Quantity per Reel
Part No.
SOT-23-6W
3,000 pcs
R1225N.xx.2.
-TR-F
R1225Nxx2x
VIN
CE
CE CONTROL
EXT
GND
VOUT
DLY
C3
+
-
C4
C2
C1
R1
PMOS
L
SD
LOAD
1
6
3
2
4
5
.xx. : Specify the output voltage within the range
1.2V (.12.) to 6.0V (.60.) in 0.1V steps.
.
. : Specify the oscillator frequency, modulation method.
.A. : 300kHz, PWM/VFM, .B. : 500kHz, PWM/VFM
.C. : 300kHz, fixed PWM, .D. : 500kHz, fixed PWM
.J. : 180kHz, PWM/VFM, .K. : 180kHz, fixed PWM
PMOS : HAT1044M, L : 27
μH, SD : RB063L-30,
C1 : 10
μF, C2 : 0.1μF, C3 : 47μF, C4 : 0.02μF, R1 : 10Ω
PACKAGE (Top View)
TYPICAL CHARACTERISTIC
SOT-23-6W
1
3
6
4
2
5
1
EXT
2
VIN
3
DLY
4CE
5
GND
6VOUT
R1225N332A
Efficiency vs. Output Current
VIN=7V, L=CDRH127(10μH)
0.1
30
40
100
90
0
70
80
50
60
10
20
1
10
100
1000 10000
Output Current IOUT (mA)
Efficiency
η
(%)
APPLICATIONS
Power source for hand-held communication equipment, cameras, and VCRs
Power source for home appliances
Power source for battery-powered equipment
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