RM6513 Datasheet PDF - REACTOR


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RM6513
REACTOR

Part Number RM6513
Description PWM Control 2A Step-Down Converter
Page 8 Pages

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DESCRIPTION
RM6513 consists of step-down switching
regulator with PWM control. These devices include
a reference voltage source, oscillation circuit, error
amplifier, internal PMOS and etc.
RM6513 provides low-ripple power, high
efficiency, and excellent transient characteristics.
The PWM control circuit is able to vary the duty
ratio linearly from 0 up to 100%. An enable function,
an over current protect function and a short circuit
protect function are built inside, and when OCP or
SCP happens, the operation frequency will be
reduced from 380KHz to 35KHz. Also, an internal
compensation block is built in to minimum external
component count.
With the addition of an internal P-channel
Power MOS, a coil, capacitors, and a diode
connected externally, these ICs can function as
step-down switching regulators. They serve as
ideal power supply units for portable devices when
coupled with the SOP–8L mini-package, providing
such outstanding features as low current
consumption. Since this converter can
accommodate an input voltage up to 18V, it is also
suitable for the operation via an AC adapter.
RM6513
PWM Control 2A Step-Down Converter
FEATURES
Input voltage: 3.6V to 18V
Output voltage: 0.8V to VCC
Duty ratio: 0% to 100% PWM control
Oscillation frequency: 380KHz typ
Current limit, Enable function
Thermal Shutdown function
Built-in internal SW P-channel MOS
SOP-8L Pb-Free Package
Applications
Battery Charger Adapter
PC Motherboard
LCD Monitor
Graphic Card
DVD-Video Player
Telecom Equipment
ADSL Modem
Printer and other Peripheral Equipment
Microprocessor core supply
Networking power supply
TYPICAL APPLICATION
+12V
U1
4 Vcc
Output 5
R1
+ EC1
R2
10K_5%
EN
Output 6
3.3K_5% 3 OCSET
Vss 7
1 FB
Vss 8
RM6513
L1 33uH_3A
D1
RA 10.5K_X5R_1%
RB
C1
22nF_X5R
+5V_2A
+ EC2
Note: VOUT = VFB x (1+RA/RB) RB=0.7K~5K ohm
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PWM Control 2A Step-Down Converter
PACKAGE INFORMATION
TOP VIEW
RM6513
PIN FUNCTIONS
SOP-8L
Pin
4
56
78
1
2
3
Symbol
Vcc
Output
Vss
FB
EN
OCSET
Function Description
IC power supply pin
Switch Pin.Output is the switch node that supplies
power to the output. Connect external inductor/diode
here. Minimize trace area at this pin to reduce EMI.
GND Pin.
Feedback pin.Through an external resistor divider
network, FB senses the output voltage and regulates
it.
Power-off pin
H:Normal operation(Step-down operation).
L: Step-down operation stopped(All circuits
deactivated).
Add an external resistor to set max output current
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ABSOLUTE MAXIMUM RATINGS
Symbol
VCC
VFB
VEN
VOUTPUT
PD
TOPR
TSTG
Parameter
VCC Pin Voltage
Feedback Pin Voltage
EN Pin Voltage
Switch Pin Voltage
Power Dissipation
Operating Temperature Range
Storage Temperature Range
Rating
VSS-0.3 to VSS+20
VSS-0.3 to VCC
VSS-0.3 to Vcc+0.3
VSS-0.3 to Vcc+0.3
Internally limited
-20 to +125
-40 to +150
Unit
V
V
V
V
mW
Caution: The absolute maximum ratings are rated values exceeding which the product could suffer physical damage.
These values must therefore not be exceeded under any conditions.
ELECTRICAL CHARACTERISTICS
The specifications are applied at T=25, Vcc=12V, unless otherwise noted.
Symbol
VIN
VFB
IFB
ISW
ISSS
IQ
ΔVOUT/VOUT
ΔVOUT/VOUT
FOSC
FOSC1
VSH
VSL
ISH
ISL
IOCSET
TSS
Parameter
Input Voltage
Feedback Voltage
Feedback Bias Current
Switch Current
Current Consumption
During Power Off
Quiescent Current
Line Regulation
Load Regulation
Oscillation Frequency
Frequency of Current
Limit or Short Circuit
Protect
EN Pin Input Voltage
EN Pin Input Leakage
Current
OCSET Pin Bias Current
Soft-Start Time
Conditions
-
IOUT=0.2A
IOUT=0.2A
-
VEN=0V
VFB=2V
VIN=7V18V
IOUT=0.2 to 2A
Measure waveform at SW
pin
Measure waveform at SW
pin
Evaluate oscillation at SW
pin
Evaluate oscillation stop
at SW pin
-
-
-
-
Min.
3.6
0.784
-
2.5
-
-
-
-
340
-
2.0
-
-
-
80
0.3
Typ.
-
0.8
0.1
-
0.1
3.0
2
0.2
380
35
-
-
20
-10
90
2
RDSON
EFFI
Internal MOSFET Rdson
Efficiency
VIN=5VVFB=0V
VIN=12VVFB=0V
VIN=12VVOUT=5V
IOUT=2A
- 100
65
- 92
Max.
18
0.816
0.5
-
-
5.0
4
0.5
420
-
-
0.8
-
-
100
5
150
100
-
Unit
V
V
uA
A
uA
mA
%
%
KHz
KHz
V
uA
uA
uA
ms
m
%
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PWM Control 2A Step-Down Converter
BLOCK DIAGRAM
RM6513
OPERATION (Refer to Block Diagram)
PWM Control
The RM6513 consists of DC/DC converters that
employ a pulse-width modulation (PWM) system. In
converters of the RM6513, the pulse width varies in
a range from 0 to 100%, according to the load
current. The ripple voltage produced by the
switching can easily be removed through a filter
because the switching frequency remains constant.
Therefore, these converters provide a low-ripple
power over broad ranges of input voltage and load
current.
RDS(ON) Current Limiting
The current limit threshold is setting by the
external resistor conne cting from VCC supply to
OCSET. The internal 90uA sink current crossing
the resistor sets the voltage at the pin of OCSET.
When the PWM voltage is less than the voltage at
OCSET, an over-current condition is triggered.
ILOAD× RDS(ON) =IOCSET ×ROCSET
Pin Functions
Vcc
This is the positive input supply for the IC switching
regulator. A suitable input bypass capacitor must
be present at this pin to minimize voltage transients
and to supply the switching currents needed by the
regulator.
Vss
Circuit ground.
SW
Internal switch. The voltage at this pin switches
between (Vcc – VDS) and approximately -0.5V, with
a duty cycle of approximately VOUT / Vcc. To
minimize coupling to sensitive circuitry, the PC
board copper area connected to this pin should be
kept a minimum.
FB
Senses the regulated output voltage to complete
the feedback loop.
EN
Allows the switching regulator circuit to be
shutdown using logic level signals thus dropping
the total input supply current to approximately
0.1uA. Pulling this pin below a threshold voltage of
approximately 0.8 V turns the regulator down, and
pulling this pin above 2V lets the regulator on.
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Sep.2009
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