R1240K003x-TR 반도체 회로 부품 판매점
30V Input PWM Step-down DC/DC Converter
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 Richo |
R1240x/R1244N Series
1.2A∗ 30V Input PWM Step-down DC/DC Converter
The R1240x/R1244N Series are 30V input, CMOS-based PWM step-down DC/DC converters featuring 1.2A∗ output current. R1240x/R1244N
include a soft start circuit and a latch or a fold-back protection circuit. (R1244N includes a fold-back Protection Circuit only.) By simply using
an inductor, resistors, a diode, and capacitors as external components, a high-efficiency step-down DC/DC converter can be easily
configured. Due to current mode PWM control, the R1240x/R1244N provide a fast response and high efficiency. Ceramic output capacitors
can be used. Two different pin layout of SOT-23-6W package as R1240N and R1244N are available.
FEATURES
• Supply Current (IDD) ······································ Typ. 500μA (No switching)
• Standby Current (Istandby) ······························· Max. 5μA (CE="L")
• Input Voltage Range (VIN) ····························· 4.5V to 30.0V
• Output Voltage Range (VOUT)························ 0.8V to 15.0V (Externally adjustable)
(Feedback voltage : 0.8V)
• Feedback Voltage Accuracy ························· ± 12mV
• Output Current (IOUT)····································· 1.2A∗
• Oscillator Frequency (fosc)····························· 1.25MHz
• Oscillator Maximum Duty Cycle (Maxduty)··· R1240x : Min. 75%, Typ. 85%
• UVLO Detect Voltage (VUVLO) ···········Typ. 3.8V
• Soft Start Time (tstart) ·······················Typ. 0.4ms
• High Side Switch Limit Current ·······Typ. 2A
• Thermal Shutdown Circuit ··············Stops at 160°C.
• Latch Protection Circuit ··················Delay time for protection
Typ. 2ms (A Version)
• Fold-back Protection Circuit ···········Fold-back frequency
Typ. 310kHz (B Version)
• Packages ········································DFN(PLP)2527-10,
R1244N : Typ. 85%
• Minimum ON Time (tMIN) ······························· Typ.100ns
SOT-23-6W
∗) This is an approximate value, because output current depending on conditions and external parts.
BLOCK DIAGRAM
TYPICAL APPLICATION
R1240x/R1244N
VIN
Thermal Shutdown
CE
UVLO
Regulator
Regulator
VFB
Shutdown
Vref
OSC
(1250kHz/
310kHz)
SETPULSE
MAXDUTY
SD
R
Soft Start
0.8V
Current Slope
Limit Latch
(Ver.A only)
Peak Current Limit
SELECTION GUIDES
BST
LX
GND
R1240x/R1244N (VOUT=3.3V)
CSPD
470pF
R1
3.75kΩ
VIN
CIN
10μF
R2
1.2kΩ
VIN
VFB
BST
LX
RBST
51Ω
CBST
100nF
L4.7μH
VOUT=3.3V
COUT
10μF
GND
CSPD : Speed-up capacitor
CIN, COUT : Ceramic capacitors can be used.
CBST : Bootstrap Capacitor
R1, R2 : Resistors for setting output voltage
RBST : Lx slew-rate adjustable resistor
CE
5.1kΩ "H"active
(optional)
Halogen Free
Package
DFN(PLP)2527-10
SOT-23-6W
Q'ty per Reel
Part No.
5,000 pcs R1240K003.∗-TR
R1240N001.∗ -TR-FE
3,000 pcs
R1244N001B-TR-FE
.∗ : Select the protection circuit from
(.A.) Latch type or (.B.) Fold-back type.
PACKAGES
TYPICAL CHARACTERISTIC
DFN(PLP)2527-10
Top View
10 9 8 7 6
Bottom View
6 7 8 9 10
∗
SOT-23-6W
654
12345
54321
123
R1240N R1244N
1 Lx
2 VIN∗∗∗
3 VIN∗∗∗
6 GND
7 NC
8 VFB
1 CE
2 VIN
3 LX
1
2
3
4 CE
9 NC
4 BST 4
5 TEST∗∗
10 BST
5 GND 5
∗) The tab is substrate level (GND).
6 VFB
6
∗∗) TEST pin should be open.
∗∗∗) The VIN pin must be wired together when it is mounted on board.
BST
GND
VFB
CE
VIN
LX
R1240x/R1244N Efficiency vs. Output Current
100
90
80
70
60
50
40
30
20
10
0
1
VOUT=3.3V, VIN=12V
10 100 1000 10000
Output Current IOUT (mA)
APPLICATIONS
• Power source for digital home appliances such as digital TVs and DVD players
• Power source for office automation equipment such as printers and fax machines
• Power source for hand-held communication equipment, cameras, and VCRs
• Power source for battery-powered equipment
No.EK-190-121001
Step-down DC/DC Converter
Free Datasheet http://www.Datasheet4U.com
Halogen Free
For the conservation of the global environment, Ricoh is advancing the decrease of the negative environmental impact material.
After Apr. 1, 2006, we will ship out the lead free products only. Thus, all products that will be shipped from now on comply with RoHS Directive.
Basically after Apr. 1, 2012, we will ship out the Power Management ICs of the Halogen Free products only. (Ricoh Halogen Free products are
also Antimony Free.)
http://www.ricoh.com/LSI/
Free Datasheet http://www.Datasheet4U.com
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R1240K003x-TR converter
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