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参数资料
| 型号： | R1224N502F-TR-F |
| 厂商： | RICOH COMPANY LTD |
| 元件分类： | 稳压器 |
| 英文描述： | 0.05 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO5 |
| 封装： | ROHS COMPLIANT, SOT-23, 5 PIN |
| 文件页数： | 1/1页 |
| 文件大小： | 175K |
| 代理商： | R1224N502F-TR-F |
R1224N Series
PWM/VFM Step-down DC/DC Controller with Ext. Tr.
No.EK-101-091101
Step-down DC/DC Converter
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 (I
DD1
) Typ. 20
μA (E, F, L, M Versions), Typ. 30μA (G Version),
Typ. 40
μA (H 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 R1224Nxx2E/F/L)
Externally adjustable (Feedback voltage of 1.0V, R1224Nxx2G/H/M)
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
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)
VIN
VOUT
CE
EXT
GND
PWM/VFM
CONTROL
+
-
+
-
Amp
OSC
Vref
Protection
Soft Start
Chip Enable
+
-
UVLO
5
4
2
1
3
VIN 5
4
VFB
CE
EXT
GND
+
-
+
-
Amp
OSC
Vref
Protection
Soft Start
Chip Enable
+
-
UVLO
2
1
3
SELECTION GUIDE
TYPICAL APPLICATIONS
Package
Quantity per Reel
Part No.
SOT-23-5
3,000 pcs
R1224N.xx.2.
-TR-F
R1224Nxx2E/F/L
VIN
CE
CE CONTROL
EXT
GND
VOUT
C3
+
-
C2
C1
R1
PMOS
L
SD
LOAD
5
4
3
2
1
R1224Nxx2G/H/M
VIN
CE
CE CONTROL
EXT
GND
VFB
C3
+
-
C1
+
-
C2
C4
R4
R2
R3
R1
PMOS
L
LOAD
SD
5
4
3
2
1
.xx. : Specify the output voltage within the range
1.2V (.12.) to 6.0V (.60.) in 0.1V steps.
(For externally adjustable output voltage type, feedback voltage of 1.0V(.10.))
.
. : Specify the oscillator frequency, modulation method, output
voltage adjustment.
.E.: 300kHz, PWM/VFM, fixed output voltage
.F. : 500kHz, PWM/VFM, fixed output voltage
.G.: 300kHz, fixed PWM, adjustable output voltage
.H.: 500kHz, fixed PWM, adjustable output voltage
.L. : 180kHz, PWM/VFM, fixed output voltage
.M.: 180kHz, fixed PWM, adjustable output voltage
PMOS : HAT1044M, L : 27
μH,
SD : RB063L-30, C1 : 10
μF, C2 : 0.1μF,
C3 : 47
μF, R1 : 10Ω
PMOS : HAT1044M, L : 27
μH,
SD : RB063L-30, C1 : 10
μF, C2 : 0.1μF,
C3 : 47
μF, C4 : 1000pF, R1 : 10Ω, R3 : 2.7kΩ,
Output voltage at 2.5V
R2 : 22kΩ, R4 : 33kΩ
PACKAGE (Top View)
TYPICAL CHARACTERISTIC
SOT-23-5
1
3
5
4
2
1
CE
2
GND
3
VOUT or VFB
4
EXT
5
VIN
R1224N332E
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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