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 (2.2μH) 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 (I
DD1
)······················· Typ. 400μA (Switching)
•
Supply Current (I
DD2
)······················· Typ. 25μA (No switching, VFM)
•
Supply Current (I
DD2
)······················· Typ. 400μA (No switching, PWM)
•
Standby Current (I
standby
)·················· Max. 5μA (CE="L")
•
Input Voltage Range (V
IN
) ··············· 2.3V to 5.5V (V
SET
≥1.0V)
•
Output Voltage Range (V
OUT
)·········· 0.8V to 3.3V (Internally fixed)
•
Output Voltage Accuracy ················± 1.5%
•
Output Current (I
OUT
)······················· 600mA
∗
•
Oscillator Frequency (f
osc
)··············· 2.25MHz
•
Oscillator Maximum Duty Cycle (Maxduty) ··· Min. 100%
•
UVLO Detect Voltage (V
UVLO
)··············Typ. 2.0V
•
Soft Start Time (t
start
)························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
(RP504N does not have MODE pin)
Packages········································DFN(PLP)1216-6F,
DFN1616-6B, SOT-23-5
∗
) This is an approximate value, because output current depending on conditions and external parts.
BLOCK DIAGRAM
RP504x
PV
IN
V
IN
CE
Chip
Enable
Slope
Compensation
Current
Feedback
TYPICAL APPLICATION
RP504L/K
V
IN
L
V
IN
CE
L
X
2.2μH
V
OUT
V
OUT
∗2
∗3
Vref
C
IN
2.2μF
L
X
C
OUT
4.7μF
OSC
Current
Protection
MODE
GND
PWM
Control
Switching
Control
Soft Start
UVLO
V
OUT
MODE
∗1
GND
L
C
IN
C
OUT
∗
1) MODE pin exists in RP504K and RP504L only. MODE="H": forced PWM control,
MODE="L": PWM/VFM auto switching control.
: MIPSZ2520D2R2, MIPS2520D2R2 (FDK),
MLP2520S2R2M, VLS252010T-2R2M (TDK)
CKP2520-2R2M (TAIYO YUDEN)
: 2.2
μ
F: C1608JB0J225K (TDK),
2.2
μ
F
×
2: C1005JB0J225K (TDK), JMK105BJ225MV (TAIYO YUDEN)
4.7
μ
F: C1005X5R0J475M (TDK), JMK105BJ475MV (TAIYO YUDEN)
: C1608JB0J475K (TDK), GRM155B30J475KE18 (MURATA)
SELECTION GUIDES
Halogen Free
Package
DFN(PLP)1216-6F
DFN1616-6B
SOT-23-5
Q'ty per Reel
Part No.
5,000 pcs RP504L.xx.1
.∗
-E2
5,000 pcs RP504K.xx.1
.∗
-TR
3,000 pcs RP504N.xx.1.$.-TR-FE
.∗
: Select from (.A.) with MODE pin, without auto-discharge function.
(.D.) with MODE pin, with auto-discharge function,
.$.
: Select from (.B.) PWM/VFM auto switching control,
without auto-discharge function,
(.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)
DFN(PLP)1216-6F
6
5
4
TYPICAL CHARACTERISTIC
SOT-23-5
5
4
DFN1616-6B
6
5
4
RP504x331x
100
90
80
70
60
50
40
30
20
10
0
Efficiency vs. Output Current
∗
1
2
3
1
2
3
1
2
3
1
2
3
4
5
6
V
IN
MODE
CE
V
OUT
GND
L
X
1
2
3
4
5
6
CE
MODE
V
IN
L
X
GND
V
OUT
1
2
3
4
5
V
OUT
GND
L
X
V
IN
CE
Efficiency
η
(%)
V
IN
=4.3V, PWM/VFM
V
IN
=5.0V, PWM/VFM
V
IN
=4.3V, forced PWM
V
IN
=5.0V, forced PWM
1
∗
) The tab is substrate level (GND).
10
100
Output Current I
OUT
(mA)
1000
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
RP50x Series 600mA
Step-down DC/DC Converter Comparison
RP504x Series
Control
Output Current *
1
Supply Current（PWM Mode）
Supply Current（VFM Mode）
Supply Current（Standby）
Input Voltage Range
Output Voltage Range
Oscillator Frequency
Output Voltage Accuracy
Oscillator Maximum
Duty Cycle
UVLO Detect Voltage
Soft-start Time
Latch Protection Circuit
（Protection
Delay Time）
Coil-current Limit Circuit
Package
RP500x Series
Step-down DC/DC Converter
600mA
∗
PWM/VFM Step-down DC/DC Converter with Synchronous Rectifier
RP502x Series
PWM/VFM auto switching /
Fixed PWM
RP503x Series
PWM/VFM auto switching
PWM/VFM auto switching /
PWM/VFM auto switching /
Forced
PWM
Fixed PWM
（It
can be switched by MODE pin）
600mA
Typ. 400μA
Typ. 25μA
Max. 5μA
2.3V to 5.5V
0.8V to 3.3V
Typ. 2.25MHz
±1.5%
Min.100%
Typ. 2.0V
Typ. 0.15ms
Typ. 1.5ms
Typ. 900mA
DFN(PLP)1212-6F
DFN1616-6B
SOT-23-5*
4
DFN Package
A Version
With MODE pin、
600mA
Typ. 400μA
Typ. 100μA
Max. 5μA
2.55V to 5.5V
1.1V to 3.3V
Typ. 1.2MHz
±1.5%
Min.100%
Typ. 2.2V
Typ. 0.12ms
Typ. 1.5ms
Typ. 900mA
WLCSP-6-P2*
3
DFN1616-6*
DFN(PLP)1820-6
SOT-23-6W
1 Version
2
600mA
Typ. 750μA
Typ. 180μA
Max. 5μA
2.5V to 5.5V
0.8V to 3.3V
Typ. 3.3MHz
±1.5%
Min.100%
Typ. 2.2V
Typ. 0.12ms
Typ. 1.5ms
Typ. 900mA
WLCSP-6-P2*
3
DFN1616-6*
2
600mA
-
Typ. 20μA
Max. 5μA
2.5V to 5.5V
0.8V to 2.5V
Typ. 2MHz
±1.5%
Min.100%
Typ. 2.2V
Typ. 0.15ms
Typ. 1.5ms
Typ. 800mA
DFN1616-6*
3
4
SOT-23-5*
1 Version
1 Version
without auto-discharge function
D Version
With MODE pin、
PWM/VFM auto switching,
PWM/VFM auto switching,
PWM/VFM auto switching,
without auto-discharge function without auto-discharge function without auto-discharge function
2 Version
2 Version
2 Version
Version
with auto-discharge function
SOT Package
B Version
Fixed PWM
、
Fixed PWM
、
without auto-discharge function without auto-discharge function
3 Version
3 Version
PWM/VFM auto switching,
with auto-discharge function
PWM/VFM auto switching,
without auto-discharge function
C Version
PWM/VFM auto switching,
with auto-discharge function
（except
for the DFN(PLP)
package）
4 Version
Fixed PWM
、
PWM/VFM auto switching,
with auto-discharge function
4
Version
Fixed PWM
、
without auto-discharge function
Fixed PWM
、
with auto-discharge function
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
Microchip MCU
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