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R1245 Series
1.2A 30V Input PWM Step-down DCDC Converter

Product Specifications

The R1245 Series are 30V input, CMOS-based PWM step-down DC/DC converters featuring 1.2A*output current. R1245 includes a soft start circuit and 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 R1245 provides a fast response and high efficiency. Ceramic output capacitors can be used.

Compared with R1240, R1245 has a lot of variation of oscillator frequency and can select 330kHz. In case of 330kHz, R1245 can set VOUT lower than R1240. The oscillator maximum duty cycle (Min.) of R1245 is larger than R1240, so it is suitable for low dropout voltage situation. The noise characteristic has been improved rather than R1240, and voltage accuracy is also improved. In addition to HSOP-8E package can be selected, so R1245S is suitable for high power dissipation case.

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

FEATURES

  Consumer Automotive
Input Voltage Range (Maximum Rating) 4.5 V to 30 V (32 V)
Operating Temperature Range −40°C to 105°C
Stand-by Current Typ. 0 µA
Internal N-channel MOSFET Driver RON = 0.35 Ω Typ.
Adjustable Output Voltage with External Resistor 0.8 V or more
Feedback Voltage and Tolerance 0.8 V ±1.0%
Peak Current Limit Typ. 2.0 A
UVLO Function Released Voltage Typ. 4.0 V
Operating Frequency 330 kHz (A/B version), 500 kHz (C/D version), 1000 kHz (E/F version), 2400 kHz (G/H version)
Fold-back Protected Frequency 170 kHz (B/D version), 250 kHz (F version), 400 kHz (H version)
Latch Protection Delay Time Typ. 4 ms for A/C/E/G version
Built-in Thermal Shutdown Circuit Typ. 160°C
Packages HSOP-8E, DFN(PLP)2020-8, SOT-23-6W HSOP-8E, DFN2020-8

APPLICATION INFORMATION

R1245x00xA/B (VOUT=1.2V, VIN=24.0V)

TYPICAL CHARACTERISTICS

R1245x00xA/B Efficiency vs. Output Current

PIN DESCRIPTION

DFN(PLP)2020-82.0 mm × 2.0 mm

DFN(PLP)2020-8

1 Lx
2 VIN**
3 VIN**
4 CE
5 GND
6 VFB
7 TEST***
8 BST
DFN2020-82.0 mm × 2.0 mm

DFN2020-8

1 Lx
2 VIN**
3 VIN**
4 CE
5 GND
6 VFB
7 TEST***
8 BST
SOT-23-6W2.9 mm × 2.8 mm

SOT-23-6W

1 BST
2 GND
3 VFB
4 CE
5 VIN
6 Lx
HSOP-8E5.2 mm × 6.2 mm

HSOP-8E

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

*) The tab is substrate level (GND).
**) TEST pin should be open.
***) The VIN pin must be wired together when it is mounted on board.


R1245 Series for Consumer

APPLICATIONS

  • Digital Home Appliances: Digital TVs, DVD Players
  • Office Equipment: Printers, Faxes
  • 5V PSU or 2-cell or more Li-ion Battery Powered Communication Equipment, Cameras, VCRs, Camcorders
  • High Voltage Battery-powered Equipment

PRODUCT LONGEVITY PROGRAM

R1245 series for consumer applications operate PRODUCT LONGEVITY PROGRAM (ten-year supply is maintained as of January, 2016).
This program has been introduced to help customers select the most appropriate part for applications that require long life cycles.


Operating Temperature Range : -40°C to 105°C


SELECTION GUIDE

In the R1245, the package, type of short protection (Latch or Fold-back), and the oscillator frequency can be selected with the user’s request.

Product Name   Package Quantity per Reel
R1245K003#-TR ConsumterPLP DFN(PLP)2020-8 5,000
R1245N001#-TR-FE ConsumterPLP SOT-23-6W 3,000
R1245S003#-E2-FE ConsumterPLP HSOP-8E 1,000
  • # … Specify a combination of the oscillator frequency and the protection circuit.
    A: 330 kHz, Latch type
    B: 330 kHz, Fold-back type
    C: 500 kHz, Latch type
    D: 500 kHz, Fold-back type
    E: 1 MHz, Latch type
    F: 1 MHz, Fold-back type
    G: 2.4 MHz, Latch type
    H: 2.4 MHz, Fold-back type

DOCUMENT/CONTACT

Purchase

Technical Support

Package *1 Marking Reliability *2
DFN(PLP)2020-8 R1245K R1245K
SOT-23-6W R1245N R1245N (-FE)
HSOP-8E R1245S R1245S (-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.


R1245 Series for Automotive

Ricoh is committed to providing a semiconductor device with the highest level of quality and reliability by restricting the device manufacturing only within Ricoh and the cooperative companies successfully passed our stringent inspections for automotive products. Ricoh established a traceability system and manages manufacturing information and logistics information from the warehouse.


Quality Ranks for Applications

Ricoh offers three different quality ranks for automotive products according to their application purposes.
R1245 Series offer products in Rank 2 and Rank 3.

Rank 2: Automotive General Equipments (Body System)

  • Power source for automotive general equipments such as electric window, side mirror, and around view camera

Rank 3: Automotive Accessories

  • Power source for car accessories such as car audio equipment, car navigation system, and ETC system

AEC-Q100 Grade 2 Compliant


PRODUCT LONGEVITY PROGRAM

R1245 series for automotive applications operate PRODUCT LONGEVITY PROGRAM (ten-year supply is maintained as of January, 2016).
This program has been introduced to help customers select the most appropriate part for applications that require long life cycles.


Operating Temperature Range : -40°C to 105°C


Tjmax 150°C

Unlike the rating of the products for consumer applications at Tjmax = 125°C, the products for automotive applications are rated at high temperature of Tjmax = 150°C. The power dissipation is also rated at high temperature.


SELECTION GUIDE

In the R1245, the package, type of short protection (Latch or Fold-back), and the oscillator frequency can be selected with the user’s request.

Product Name   Package Quantity per Reel
R1245L003#-TR-AE AutomotiveAutomotive AccessoriesAEC-Q100PLP DFN2020-8 3,000
R1245S003$-E2-JE AutomotiveAutomotive General EquipmentsAEC-Q100PLP HSOP-8E 1,000
R1245S003#-E2-AE AutomotiveAutomotive AccessoriesAEC-Q100PLP
  • # … Specify a combination of the oscillator frequency and the protection circuit.
    A: 330 kHz, Latch type
    B: 330 kHz, Fold-back type
    C: 500 kHz, Latch type
    D: 500 kHz, Fold-back type
    E: 1 MHz, Latch type
    F: 1 MHz, Fold-back type
    G: 2.4 MHz, Latch type
    H: 2.4 MHz, Fold-back type
  • $ … Specify a combination of the oscillator frequency and the protection circuit.
    A: 330 kHz, Latch type
    B: 330 kHz, Fold-back type
    G: 2.4 MHz, Latch type
    H: 2.4 MHz, Fold-back type

DOCUMENT/CONTACT

Purchase

Technical Support

Package*1 Reliability*2
DFN2020-8 R1245L (-AE)
HSOP-8E R1245S (-JE) *3
R1245S (-AE)

*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.
*3: The reliability information is not listed for devices above rank2. Please contact Ricoh sales representatives for further informations.

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