RP504K221D-TR [RICOH]
Switching Controller;
| 型号： | RP504K221D-TR |
| 厂家： | 
RICOH ELECTRONICS DEVICES DIVISION |
| 描述： | Switching Controller |
| 文件： | 总2页 (文件大小：337K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
RP504x Series
600mA∗ PWM/VFM Step-down DC/DC Converter with Synchronous Rectifier
The RP504x Series are low supply current CMOS-based PWM/VFM step-down DC/DC converters with synchronous rectifier.
RP504K/L can be switched from two control types by inputting signal to the MODE pin - forced PWM control or PWM/VFM auto switching
control in which mode automatically switches to high-efficiency VFM mode in low output current. (RP504N Series can be selected from
forced PWM control or PWM/VFM auto switching control.) RP504x includes a soft start circuit, an under-voltage lockout circuit (UVLO), and a
latch protection circuit. By simply using an inductor and capacitors as external components, a high-efficiency step-down DC/DC converter
can be easily configured. The small inductor (2.2
μ
H) and output capacitor (4.7μH) can be used by the switching of 2.25MHz. In addition to
SOT-23-5 and DFN1616-6B packages, a 1.2mm
× 1.6mm DFN(PLP)1216-6B package is also available.
FEATURES
• Supply Current (IDD1)·······················Typ. 400μA (Switching)
• Supply Current (IDD2)·······················Typ. 25μA (No switching, VFM)
• Supply Current (IDD2)·······················Typ. 400μA (No switching, PWM)
•
UVLO
)··············Typ. 2.0V
• USVofLtOStDaertteTcitmVeolt(atsgtaert (V
)························Typ. 0.15ms
• Coil-current Limit Circuit ·················Current limit Typ. 900mA
• Latch Protection Circuit ··················Delay time for protection Typ. 1.5ms
• Auto-discharge Function·················D Version
• MODE pin·······································"H": forced PWM control
"L": PWM/VFM auto switching control
• Standby Current (Istandby)··················Max. 5μA (CE="L")
• Input Voltage Range (VIN)···············2.3V to 5.5V (VSET≥1.0V)
• Output Voltage Range (VOUT)··········0.8V to 3.3V (Internally fixed)
• Output Voltage Accuracy ················± 1.5%
• Output Current (IOUT)·······················600mA∗
(RP504N does not have MODE pin)
• Oscillator Frequency (fosc)···············2.25MHz
• Packages········································DFN(PLP)1216-6F,
•
Oscillator Maximum Duty Cycle (Maxduty) ···Min. 100%
DFN1616-6B, SOT-23-5
) This is an approximate value, because output current depending on conditions and external parts.
∗
BLOCK DIAGRAM
TYPICAL APPLICATION
RP504x
RP504L/K
PVIN
L
VIN
VOUT
V
IN
VIN
LX
2.2μH
Slope
Current
Chip
CE
Compensation
Feedback
Enable
CE
VOUT
C
IN
C
OUT
2.2μF
4.7μF
∗2
∗3
OSC
Current
Protection
L
X
MODE
GND
Vref
PWM
Control
Switching
Control
Soft Start
V
OUT
UVLO
L
: MIPSZ2520D2R2, MIPS2520D2R2 (FDK),
MLP2520S2R2M, VLS252010T-2R2M (TDK)
CKP2520-2R2M (TAIYO YUDEN)
MODE∗1
GND
CIN
: 2.2 F: C1608JB0J225K (TDK),
μ
2.2 F 2: C1005JB0J225K (TDK), JMK105BJ225MV (TAIYO YUDEN)
μ ×
1) MODE pin exists in RP504K and RP504L only. MODE="H": forced PWM control,
MODE="L": PWM/VFM auto switching control.
∗
4.7 F: C1005X5R0J475M (TDK), JMK105BJ475MV (TAIYO YUDEN)
μ
COUT : C1608JB0J475K (TDK), GRM155B30J475KE18 (MURATA)
SELECTION GUIDES
: Select from (
.
A
.
) with MODE pin, without auto-discharge function.
.
∗
Package
DFN(PLP)1216-6F 5,000 pcs RP504L
Halogen Free
Q'ty per Reel
Part No.
(.
D
.
) with MODE pin, with auto-discharge function,
.
xx.
1.∗-E2
$ : Select from (
.
B
.
) PWM/VFM auto switching control,
.
.
DFN1616-6B
SOT-23-5
5,000 pcs RP504K
3,000 pcs RP504N
.
xx
.
1.∗-TR
without auto-discharge function,
.
xx
.
1$-TR-FE
.
.
(.
C
.
) forced PWM control, without auto-discharge function.
.
xx.
: Specify the output voltage within the range of
0.8V (
.
08
.
) to 3.3V (
.
33
.
) in 0.1V steps.
PACKAGES (Top View)
TYPICAL CHARACTERISTIC
RP504x331x Efficiency vs. Output Current
DFN(PLP)1216-6F
DFN1616-6B
SOT-23-5
6
5
4
5
4
6
5
4
100
90
80
70
60
50
40
∗
1
2
3
1
2
3
1
2
3
1
2
3
4
5
6
VIN
MODE
CE
VOUT
GND
LX
1
2
3
4
5
6
CE
1
2
3
4
5
VOUT
GND
LX
VIN
CE
MODE
VIN
30
20
10
0
VIN=4.3V, PWM/VFM
VIN=5.0V, PWM/VFM
VIN=4.3V, forced PWM
VIN=5.0V, forced PWM
LX
GND
VOUT
1
10
100
1000
) The tab is substrate level (GND).
∗
Output Current IOUT (mA)
APPLICATIONS
• Power source for battery-powered equipment
• Power source for hand-held communication equipment, cameras, and VCRs
• Power source for compact HDD
No.EK-259-121001
Step-down DC/DC Converter
RP504x Series
Step-down DC/DC Converter
600mA∗ PWM/VFM Step-down DC/DC Converter with Synchronous Rectifier
RP50x Series 600mA
Step-down DC/DC Converter Comparison
RP504x Series
RP500x Series
RP502x Series
RP503x Series
PWM/VFM auto switching /
Forced PWM
PWM/VFM auto switching / PWM/VFM auto switching /
PWM/VFM auto switching
Control
Fixed PWM
Fixed PWM
（
It can be switched by MODE pin
）
Output Current *1
600mA
600mA
600mA
600mA
-
Supply Current
（
PWM Mode
VFM Mode
）
Typ. 400μA
Typ. 400μA
Typ. 100μA
Typ. 750μA
Typ. 180μA
Supply Current
（
）
Typ. 25μA
Typ. 20μA
Supply Current
（Standby）
Max. 5μA
Max. 5μA
Max. 5μA
Max. 5μA
Input Voltage Range
Output Voltage Range
Oscillator Frequency
2.3V to 5.5V
0.8V to 3.3V
Typ. 2.25MHz
±1.5%
2.55V to 5.5V
1.1V to 3.3V
Typ. 1.2MHz
±1.5%
2.5V to 5.5V
0.8V to 3.3V
Typ. 3.3MHz
±1.5%
2.5V to 5.5V
0.8V to 2.5V
Typ. 2MHz
±1.5%
Output Voltage Accuracy
Oscillator Maximum
Duty Cycle
Min.100%
Min.100%
Min.100%
Min.100%
UVLO Detect Voltage
Soft-start Time
Typ. 2.0V
Typ. 2.2V
Typ. 2.2V
Typ. 2.2V
Typ. 0.15ms
Typ. 0.12ms
Typ. 0.12ms
Typ. 0.15ms
Latch Protection Circuit
（Protection Delay Time）
Typ. 1.5ms
Typ. 1.5ms
Typ. 1.5ms
Typ. 1.5ms
Coil-current Limit Circuit
Package
Typ. 900mA
Typ. 900mA
Typ. 900mA
WLCSP-6-P2*2
DFN1616-6*3
Typ. 800mA
DFN1616-6*3
SOT-23-5*4
DFN(PLP)1212-6F
DFN1616-6B
WLCSP-6-P2*2
DFN1616-6*3
DFN(PLP)1820-6
SOT-23-6W
SOT-23-5*4
A Version
With MODE pin、
1 Version
PWM/VFM auto switching,
without auto-discharge function without auto-discharge function without auto-discharge function
2 Version
Fixed PWM、
without auto-discharge function without auto-discharge function
3 Version
PWM/VFM auto switching,
with auto-discharge function
1 Version
PWM/VFM auto switching,
1 Version
PWM/VFM auto switching,
without auto-discharge function
D Version
With MODE pin、
with auto-discharge function
B Version
PWM/VFM auto switching,
without auto-discharge function
2 Version
Fixed PWM、
2 Version
PWM/VFM auto switching,
with auto-discharge function
3 Version
PWM/VFM auto switching,
with auto-discharge function
Version
Fixed PWM、
with auto-discharge function
Version
4
（
except for the DFN(PLP)
package）
C Version
Fixed PWM、
without auto-discharge function
4 Version
Fixed PWM、
with auto-discharge function
*1) This is an approximate value, because output current depending on conditions and external parts.
*2) RP500Z and RP502Z are pin-compatible *3) RP500L, RP502L, and RP503L are pin-compatible *4) RP503N and RP504N are pin-compatible
The currently available information as of October 2012 is provided in this New Product News.
EK-259-121001
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