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RICOH ELECTRONIC DEVICES CO., LTD.

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R1242 Series
3A 30V Input PWM Step-down DCDC Converter with Synchronous Rectifier Ext. Low-side Tr.

Product Specifications

The R1242 Series are 30V input, CMOS-based PWM step-down DC/DC converters featuring 3A* output current. R1242 includes a soft start circuit and a latch or fold-back protection circuit. By simply using an inductor, resistors, a low side switch (FET), and capacitors as external components, a high-efficiency step-down DC/DC converter can be easily configured. Due to current mode PWM control, the R1242 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) 5 V to 30 V (32 V)
Supply Current Typ. 0.8 mA (VIN = 30 V, Set VFB = 1.0 V)
Standby Current Typ. 0 µA (VIN = 30 V, CE = L)
Output Voltage Range 0.8 V to 15 V, Adjustable using external resistors
Feed Back Voltage Accuracy 0.8 V with 1.5% accuracy
Output Current 3 A*
Oscillator Frequency 330 kHz to 1 MHz (Ver. A/B), 330 kHz (Ver. C/D), 500 kHz, (Ver. E/F), 1000 kHz (Ver. G/H)
Maximum Duty Cycle Typ. 88%
UVLO Detector Threshold Typ. 3.6 V
Soft-start Time Typ. 0.5 ms
Peak Current Limit Typ. 4.5 A
Thermal Shutdown Typ. 160°C
Latch Type Protection Delay Time: Typ. 5 ms (Ver. A/C/E/G)
Fold-back Type Protection Fold-back Frequency: Ver. B: fosc x 1/4, Ver. D: 83 kHz, Ver. F: 125 kHz, Ver. H: 250 kHz
Package HSOP-8E

*) This is an approximate value, because output current depending on conditions and external parts.

APPLICATION INFORMATION

R1242S001A/B (VOUT=3.3V, 1MHz)

TYPICAL CHARACTERISTICS

R1242S Efficiency vs. Output Current

PIN DESCRIPTION

HSOP-8E5.2 mm × 6.2 mm

HSOP-8E

1 CE
2 EXT
3 BST
4 VIN
5 Lx
6 GND
7 VFB
8 RT or TEST**

*) The tab is substrate level (GND).
**) The TEST pin connected to the GND level or should be open.


R1242 Series for Consumer

APPLICATIONS

  • Digital Home Appliances: Digital TVs, DVD Players
  • Office Automation Equipment: Printers, Fax
  • Hand-held Communication Equipment: Cameras, Video Recorders
  • Battery-powered Equipment

SELECTION GUIDE

The oscillator frequency (Adjustable, Fixed: 330 kHz, 500 kHz, 1000 kHz) and the short-circuit protection type (Latch, Fold-back) are user-selectable options.

Product Name   Package Quantity per Reel
R1242S001#-E2-FE Consumter HSOP-8E 1,000
  • # … Specify the oscillator frequency and the short-circuit protection type.
    A: Oscillator frequency adjustable, Latch type
    B : Oscillator frequency adjustable, Fold-back type
    C: 330 kHz, Latch type
    D: 330 kHz, Fold-back type
    E: 500 kHz, Latch type
    F: 500 kHz, Fold-back type
    G: 1000 kHz, Latch type
    H: 1000 kHz, Fold-back type

DOCUMENT/CONTACT

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Technical Support

Package *1 Marking Reliability *2
HSOP-8E R1242S R1242S (-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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