RP510L Series
4 A Forced PWM Step-down DC/DC Converter with Synchronous Rectifier
No. EA-366-180125
OVERVIEW
The RP510L is a low input voltage step-down DC/DC converter that operates from 2.5 V to 5.5 V and provides up to 4
A of output current
(1)
. It is suitable for power supply of SoC (System-on-a-chip). It is also available in a foldback type
overcurrent protection which automatically recovers to the normal state after the cause of overcurrent is removed.
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KEY BENEFITS
The realization of the high-density mounting by the adoption of a small package DFN3030-12.
A simplification of the power sequencing by power-good and adjustable soft-start functions.
Selectable overcurrent protection: Latch type or Foldback type.
KEY SPECIFICATIONS
Operating Temperature Range:
−40°C
to 85°C
Output Voltage Range
(2)
: 0.8 V to 3.3 V
Output Voltage Accuracy
(3)
: ±1% (V
SET
≥ 1.2
V),
±12 mV (V
SET
< 1.2 V)
Feedback Voltage Accuracy
(4)
: ±6 mV (V
FB
= 0.6 V)
Output/Feedback Voltage Temperature Coefficient: ±100 ppm/°C
Standby Current: Typ.0.35 µA (RP510LxxN)
Typ.0.01 µA or less (RP510LxxG/H/J)
Oscillator Frequency: Typ. 2.3 MHz
Built-in Driver On-resistance (Pch./Nch.): Typ. 0.04
Ω
(V
IN
= 3.6 V)
Maximum Duty Cycle: Min. 100%
Minimum On Time: Typ. 55 ns
Protection Features: UVLO, LX Peak Current Limit, Overcurrent
protection (Latch/Foldback type), and Thermal shutdown.
TYPICAL CHARACTERISTICS
V
OUT
= 1.2 V, V
IN
= 3.3 V/5.0 V (Ta = 25°C)
TYPICAL APPLICATION CIRCUIT
V
IN
PVIN
PVIN
R
AVIN
1
Ω
AVIN
RP510L
PG
CE
C
AVIN
0.01µF
TSS
PGND
AGND
R
2
VFB
C
OUT 1
22µF
C
OUT 2
22µF
LX
LX
PGND
R
1
L
1µH
V
OUT
PACKAGE
C
IN
22µF
C
1
DFN3030-12
3.0 x 3.0 x 0.8
(1)
mm
(1)
maximum dimension
RP510L001G/1H/4G/4H (
Adjustable Output Voltage Type
)
APPLICATIONS
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(1)
POL (Point of Load) Converter, and Micro-processor Power Supply with using Battery
Server, Networking Equipment, FPGA, and DSP
(2)
The maximum allowable output current is 4 A but it is a criterion and can be affected by conditions and external parts.
Refer to the section
SELECTION GUIDE
for details of V
SET
.
(3)
Fixed Output Voltage Type
(4)
Adjustable Output Voltage Type
1
RP510L
No. EA-366-180125
SELECTION GUIDE
The set output voltage, the output voltage type, the auto-discharge function
(1)
, and the protection type are user-
selectable options.
Selection Guide
Product Name
RP510Lxx$$-TR
Package
DFN3030−12
Quantity per Reel
3,000 pcs
Pb Free
Yes
Halogen Free
Yes
xx: Set Output Voltage (V
SET
).
Fixed Output Voltage Type: 08 (0.8 V), 10 (1.0 V), 11 (1.1 V), 12 (1.2 V), 13 (1.3 V), 15 (1.5 V),
18 (1.8 V), 30 (3.0 V), 33 (3.3 V)
Adjustable Output Voltage Type: 00 (0.8 V to 3.3 V)
$$: Other Functions
Version
RP510Lxx1G
RP510Lxx1H
RP510L001J
RP510L001N
RP510Lxx4G
RP510Lxx4H
RP510L004J
RP510L004N
Output Voltage
Type
Fixed
Adjustable
Fixed
Adjustable
Auto-discharge
Function
No
Yes
No
Yes
No
Yes
No
Yes
Oscillator
Frequency
Protection
Type
Latch
2.3 MHz
Foldback
(1)
Auto-discharge function quickly lowers the output voltage to 0 V, when the chip enable signal is switched from the
active mode to the standby mode, by releasing the electrical charge accumulated in the external capacitor.
2
RP510L
No. EA-366-180125
BLOCK DIAGRAM
RP510Lxx1G/4G/1H/4H (Fixed Output Voltage Type)
PVIN
Ramp
Compensation
Thermal
Protection
Current
Feedback
AVIN
UVLO
Current
Detector
Switching
Control
LX
Soft Start
Vref
TSS
(“L” during
Soft Start)
OSC
PGND
VOUT
CE
AGND
Chip
Enable
PG
Over /Under
Voltage
Detection
OVD
UVD
RP510Lxx1G/ 4G Block Diagram
PVIN
Ramp
Compensation
Thermal
Protection
Current
Feedback
AVIN
UVLO
Current
Detector
Switching
Control
LX
Soft Start
Vref
TSS
(“L” during
Soft Start)
OSC
PGND
VOUT
CE
AGND
Chip
Enable
PG
Over /Under
Voltage
Detection
OVD
UVD
RP510Lxx1H/ 4H Block Diagram
3
RP510L
No. EA-366-180125
RP510L001J/4J/1N/4N (Adjustable Output Voltage Type)
PVIN
Ramp
Compensation
Thermal
Protection
Current
Feedback
AVIN
UVLO
Current
Detector
Switching
Control
LX
Soft Start
Vref
TSS
(“L” during
Soft Start)
OSC
PGND
VFB
CE
AGND
Chip
Enable
PG
Over /Under
Voltage
Detection
OVD
UVD
RP510L001J/ 4J Block Diagram
PVIN
Ramp
Compensation
Thermal
Protection
Current
Feedback
AVIN
UVLO
Current
Detector
Switching
Control
LX
Soft Start
Vref
TSS
(“L” during
Soft Start)
OSC
PGND
VFB
CE
AGND
Chip
Enable
PG
Over /Under
Voltage
Detection
OVD
UVD
RP510L001N/ 4N Block Diagram
4
RP510L
No. EA-366-180125
PIN DESCRIPTION
Top View
1
2
3
4
5
6
12
11
10
9
8
7
12
11
10
9
8
7
Bottom View
∗
1
2
3
4
5
6
DFN3030-12 Pin Configurations
DFN3030-12 Pin Description
Pin No.
Pin Name
1
2
3
4
5
6
7
8
9
10
11
12
performance.
Description
Input Voltage Pin
Input Voltage Pin
Input Voltage Pin
Power Good Pin, NMOS Open-drain
Chip Enable Pin, Active-high
Soft-start Pin
Output Voltage Pin / Feedback Voltage Pin
Analog Ground Pin
Power Ground Pin
Power Ground Pin
Switching Pin
Switching Pin
PVIN
(1)
PVIN
(1)
AVIN
(2)
PG
CE
TSS
VOUT/ VFB
AGND
(3)
PGND
(3)
PGND
(3)
LX
LX
∗
The tab on the bottom of the package must be connected to the ground plane on the board to enhance thermal
(1)
(2)
No.1 pin and No.2 pin must be wired to the V
IN
plane when mounting on boards.
No.3 pin must be wired to No.1 and No.2 pins via a low-pass filter (LPF: 1
Ω, 10
nF) when mounting on boards.
(3)
No.8 pin, No.9 pin and No.10 pin must be wired to the GND plane when mounting on boards.
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