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PDF RP506Kxx1D Data sheet ( Hoja de datos )
| Número de pieza | RP506Kxx1D | |
| Descripción | 2A PWM/VFM Step-down DC/DC Converter | |
| Fabricantes | RICOH | |
| Logotipo |  |
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RP506x Series
2 A PWM/VFM Step-down DC/DC Converter with Synchronous Rectifier
NO.EA-296-130925
OUTLINE
The RP506x are low supply current CMOS-based PWM/VFM step-down DC/DC converters with synchronous
rectifier featuring 2 A*1 output current. Internally, a single converter consists of an oscillator, a reference voltage
unit, an error amplifier, a switching control circuit, a mode control circuit, a soft start circuit, a latch type protection
circuit, an under-voltage lockout (UVLO) circuit, a thermal shutdown circuit, and switching transistors.
The RP5 06x is empl oying synchronous rectification f or imp roving the efficiency of rectificatio n by repla cing
diodes with built-in switching transistors. Using synchronous rectification not only increases circuit performance
but also allows a design to reduce parts count.
Power controlling method can be selected from forced PWM control type or PWM/VFM auto switching control
type by inputting a signal to the MODE pin. In low output current, forced PWM control switches at fixed frequency
rate in o rder to redu ce n oise. Likewi se, in low out put current, PWM/VFM auto swit ching co ntrol automati cally
switches from PWM mode to VFM mode in order to achieve high efficiency.
Output voltage type can be selected from an internally fixed output voltage type (RP506Kxx1A/B/D/E) or an
externally adjustable output voltage type (RP506K001C/F). The output voltage of the RP506Kxx1A/B/D/E can be
set by 0.1 V step and the output voltage accuracy is as high as ±1.5% or ±18 mV. The output voltage of the
RP506K001C/F can be set by using the external resistors.
Oscillator frequency can be selected from 2.25 MHz (RP506Kxx1A/B/C) or 1.2 MHz (RP506Kxx1D/E/F).
Soft-start time is Typ. 0.15 ms, and by connecting an external capacitor to the TSS pin, soft-start time is
adjustable.
Power good (PG) function monitors the VOUT pin voltage or the feedback pin voltage (VFB), and switches the PG
pin to low if any abnormal condition is detected.
Protection circuits included in the RP506x are over current protection circuit, latch type protection circuit and
thermal shutdown circuit. Over current protection circuit supervises the inductor peak current in each switching
cycle, and if the current exceeds the LX current limit (ILXLIM), it turns off Pch Tr. Latch type protection circuit latches
the built-in driver to the OFF state and stops the operation of the step-down DC/DC converter if the over current
status continues or VOUT continues being the half of the setting volt age for equal or longer than protection delay
time (tprot ). Therm al shut down ci rcuit detects ove rheating of the conve rter if the output pi n is shorte d to the
ground pin (GND) etc. an d stops the c onverter operation to protect it from damage if the junctio n temperature
exceeds the specified temperature.
The RP506x is available in DFN(PLP)2527-10 which achieves high-density mounting on boards.
*1 This is an approximate value. The output current is dependent on conditions and external components.
1
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1 page  
RP506x
NO.EA-296-130925
SELECTION GUIDE
The set output voltage, the output voltage type, the auto-discharge function*1, and the oscillator frequency
for the ICs are user-selectable options.
Selection Guide
Product Name
Package
Quantity per Reel
Pb Free
Halogen Free
RP506Kxx1$(y)-TR DFN(PLP)2527−10
5,000 pcs
Yes
Yes
xx:
Designation of the
For Fixed Output
set output voltage
Voltage Type: 0.6
V(V(S0E6T))*2
to
3.3
V
(33)
in
0.1
V
steps*3
For Adjustable Output Voltage Type: 001 only
(y): If VSET includes the 3rd digit, indicate the digit of 0.01 V.
(1.25 V)
Ex. If VSET is 1.25 V, RP506K121$5-TR-FE.
$: Designation of Version
Version
Output Voltage Auto-discharge
Type
Function
RP506Kxx1A
RP506Kxx1B
RP506K001C
RP506Kxx1D
RP506Kxx1E
RP506K001F
Fixed
Adjustable
Fixed
Adjustable
No
Yes
No
Yes
No
Oscillator
Frequency
VSET
Forced PWM
PWM/VFM
Auto Switching
2.25 MHz
1.1 V to 3.3 V
1.1 V to 4.0 V
0.8 V to 3.3 V
0.8 V to 4.0 V
1.2 MHz
0.6 V to 3.3 V
0.6 V to 4.0 V
*1 Auto-discharge function quickly lowers the output vo ltage to 0 V, when the chip enable signal is s witched from th e
active mode to the standby mode, by releasing the electrical charge accumulated in the external capacitor.
*2 VSET can be set only within the specified range of voltage. Refer to Designation of Version for detailed information.
*3 0.05 V step is also available as a custom code.
5
5 Page 
Recommended External Components
Symbol
Size
Part Description
CIN 10 μF
Ceramic Capacitor
COUT
22 μF x 2
10μF x 3
Ceramic Capacitor
Ceramic Capacitor
L
(VSET ≤ 3.3V)
2.2 μH
Inductor
L
(VSET > 3.3V*1)
4.7 μH
Inductor
*1 Only for RP506Kxx1C/F
Small and Low Profile External Components
Symbol
Size
Part Description
L
(VSET ≤ 1.5V)
1.0 μH
Inductor
L
(VSET ≤ 2.3V)
1.5 μH
Inductor
L 2.2 μH Inductor
RP506x
NO.EA-296-130925
Model
C1608JB0J106M (TDK)
JMK107BJ106MA (Taiyo Yuden)
C2012JB0J226M (TDK)
C1608JB0J106M (TDK)
JMK107BJ106MA (Taiyo Yuden)
SLF6045T-2R2N3R3 (TDK)
CLF7045-2R2N (TDK)
FDSD0415-2R2M (TOKO)
RLF7030T-2R2M5R4 (TDK)
SLF6045T-4R7N2R4 (TDK)
CLF7045-4R7N (TDK)
FDSD0415-4R7M (TOKO)
RLF7030T-4R7M3R4 (TDK)
Model
DFE252010R-H-1R0M (TOKO)
VLS252010HBX-1R0M (TDK)
DFE252010R-H-1R5M (TOKO)
VLS252010HBX-1R5M (TDK)
DFE252010R-H-2R2M (TOKO)
VLS252010HBX-2R2M (TDK)
11
11 Page | ||
| Páginas | Total 49 Páginas | |
| PDF Descargar | [ Datasheet RP506Kxx1D.PDF ] | |
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