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About RICOH Electronic Devices
R1243 Series
2A 30V Input PWM Step-down DCDC Converter
- PLP
- RoHs
Product Specifications
The R1243 Series are 30V input, CMOS-based PWM step-down DC/DC converters featuring 2A* output current. R1243 includes a soft start circuit and a latch or fold-back protection circuit. 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 R1243 provides a fast response and high efficiency.
*) This is an approximate value, because output current depending on conditions and external parts.
FEATURES
| Input Voltage Range (Maximum Rating) | 4.5 V to 30 V (32 V) |
|---|---|
| Supply Current | Typ. 0.7 mA (VIN=30V, VFB=1.0V) |
| Standby Current | Typ. 0 µA (VIN=30V, CE=“L”) |
| Output Voltage Range | 0.8 V to 18 V, Adjustable with external resistors |
| Feedback Voltage | 0.5 V with 1.4% accuracy |
| Output Current | Max. 2 A* |
| Peak Current Limiting | Typ. 3.8 A |
| Internal Nch MOSFET Driver | Typ. 175 mΩ |
| Maximum Duty Cycle | Min. 85% |
| Oscillator Frequency | Ver. A/B: 1000 kHz, Ver. C/D: 330 kHz |
| Latch Type Protection | Ver. A/C: Typ. 2 ms, Ver. E: 0.08 ms |
| Fold-back Type Protection | Ver. B: 250 kHz, Ver. D: 82.5 kH |
| Internal Soft-start Time | Typ. 0.4 ms, TSS = Open |
| External Soft-start Time | Typ. 12 ms, CSS = 0.1 µF |
| Flag Output | Typ. 0.25 ms, FLG “OFF” delay time |
| UVLO Released Voltage | Typ. 4.0 V |
| Thermal Shutdown | Typ. 160°C, Hysteresis = 35°C |
| Packages | HSOP-8E (Ver.A/B/C/D/E), DFN(PLP)2527-10 (Ver.A/B/C/D) |
*) This is an approximate value, because output current depending on conditions and external parts.
APPLICATION INFORMATION
R1243x001C/D
(VOUT=5.0V, Soft Start Time 12ms, Flag Function using)
TYPICAL CHARACTERISTICS
Efficiency vs. Output Current
R1243x001A/B, R1243S001E
R1243x001C/D
PIN DESCRIPTION
2.5 mm × 2.7 mmDFN(PLP)2527-10
| 1 | Lx |
| 2 | Lx |
| 3 | GND |
| 4 | VFB |
| 5 | FLG** |
| 6 | CE |
| 7 | TSS |
| 8 | BST |
| 9 | VIN |
| 10 | VIN |
*) The tab is substrate level (GND), must be connected to GND level.
**) The FLG pin connected to the GND level or should be open when FLG is not used.
5.2 mm × 6.2 mmHSOP-8E
| 1 | BST |
| 2 | VIN |
| 3 | Lx |
| 4 | GND |
| 5 | VFB |
| 6 | FLG** |
| 7 | CE |
| 8 | TSS |
*) The tab is substrate level (GND), must be connected to GND level.
**) The FLG pin connected to the GND level or should be open when FLG is not used.
R1243 Series for Consumer
APPLICATIONS
- Digital Home Appliances
- Hand-held Communication Equipment: Cameras, VCRs, Camcorders
- Battery-powered Equipment
- Battery Charger
PRODUCT LONGEVITY PROGRAM
R1243 series operate PRODUCT LONGEVITY PROGRAM.
This program has been introduced to help customers select the most appropriate part for applications that require long life cycles.
SELECTION GUIDE
The package type, the oscillator frequency (Fixed: 1000 kHz, 330 kHz) and the short-circuit protection type (Latch, Fold-back) are user-selectable options.
| Product Name | Package | Quantity per Reel | |
|---|---|---|---|
| R1243K001#-TR |   |
DFN(PLP)2527-10 | 5,000 |
| R1243S001#-E2-FE | |
HSOP-8E | 1,000 |
- # … Specify the oscillator frequency and the short-circuit protection type.
A: Fixed Frequency: 1000 kHz, Latch Protection
B: Fixed Frequency: 1000 kHz, Fold-back Protection
C: Fixed Frequency: 330 kHz, Latch Protection
D: Fixed Frequency: 330 kHz, Fold-back Protection
DOCUMENT/CONTACT
| Package *1 | Marking | Reliability *2 |
|---|---|---|
| DFN(PLP)2527-10 | R1243K | R1243K |
| HSOP-8E | R1243S | R1243S (-FE) |
*1: The package file includes package dimensions, taping specifications, taping reels dimensions, power dissipations, and land pattern (foot pattern).
*2: Reliability file includes a reliability test report and a reflow profile.
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