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R1270 Series
3A 34V Input PWM/VFM Step-down DCDC Converter with PLL Synchronization

Product Specifications

The R1270 Series are 34V input (Absolute maximum rating: 36V), CMOS-based PWM/VFM step-down DC/DC converters capable of outputting the maximum 3A* current. The R1270 is selectable from two control types - PWM control or PWM/VFM auto switching control in which mode automatically switches to high-efficiency VFM mode in low output current. The R1270 includes a soft start circuit, a fold-back protection circuit and a latch protection circuit (only A Version). By simply using an inductor, resistors, and capacitors as external components, a high-efficiency step-down DC/DC converter can be easily configured. The R1270 can be synchronized externally by PLL.

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

FEATURES

  Consumer Automotive
Input Voltage Range (Maximum Rating) 3.6 V to 34 V (36 V)
Operating Temperature Range -40°C to 105°C -40°C to 125°C
Consumption Current Typ. 18 µA (VIN = 12V)
Stand-by Current Typ. 0 µA (VIN = 34V, CE=0V)
Output Voltage Externally-adjustable at 0.8 V or more (Max. step down ratio 160ns × fosc)
Feedback Voltage and Tolerance 0.8 V ±1.0%
Output Current 3 A*
Operating Frequency 300 kHz to 2.4 MHz settable by external resistor
Minimum Off Time Typ. 120 ns
Maximum Duty Min. 93% (fosc = 300kHz), Min. 67% (fosc = 2400kHz)
UVLO Function Detection Voltage Typ. 2.6 V
OVLO Function Detection Voltage Typ. 38 V
Soft-start Time Internal soft-start time (Typ. 0.4 ms), as a lower limit,
Externally-adjustable by using capacitor
High-side Switch Current Limit Typ. 4.5 A, as a upper limit,
Externally-adjustable by using resistor
Thermal Shutdown Function Typ. 160°C
CE Threshold Voltage Typ. 1.0 V
Latch Protection Delay Time Typ. 2 ms (R1270S001A)
Fold-back Protection Fold-back for oscillation frequency
VFB Voltage Temperature Tolerance (ΔVFB/ΔTa) Typ. ±100 ppm/°C (−40°C ≤ Ta ≤ 125°C)
Package HSOP-18

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

APPLICATION INFORMATION

TYPICAL CHARACTERISTICS

R1270S Efficiency vs. Output Current

PIN DESCRIPTION

HSOP-18

HSOP-185.2 mm × 6.2 mm
1 Lx
2 Lx
3 NC**
4 GND
5 INT
6 FB
7 ER
8 EC
9 LMT
10 PLLREF
11 PLLFLTR
12 RT
13 FLG***
14 CE
15 SS
16 BST
17 VIN
18 VIN

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


R1270 Series for Consumer

APPLICATIONS

  • Power source for portable equipment such as PDA, DSC, Notebook PC.
  • Power source for office equipment such as printers and fax machines
  • Power source for 5V PSU or 2-cell or more Li-ion battery powered communication equipment, cameras, video instruments such as VCRs, camcorders
  • Power source for high voltage battery-powered equipment

PRODUCT LONGEVITY PROGRAM

R1270 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.


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


SELECTION GUIDE

The latch type protection function is user-selectable.

Product Name   Package Quantity per Reel
R1270S001#-E2-FE ConsumerPLP HSOP-18 1,000
  • # … Select the presence or absence of the latch type protection function.
    A: with Latch type protection function
    B: without Latch type protection function

DOCUMENT/CONTACT

Purchase

Technical Support

Package *1 Reliability *2
HSOP-18 R1270S (-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.


R1270 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.
R1270 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 1 Compliant


PRODUCT LONGEVITY PROGRAM

R1270 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.


Operating Temperature Range : -40°C to 125°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

The latch type protection function is user-selectable.

Product Name   Package Quantity per Reel
R1270S001#-E2-KE AutomotiveAutomotive General EquipmentsAEC-Q100PLP HSOP-18 1,000
R1270S001#-E2-AE AutomotiveAutomotive AccessoriesAEC-Q100PLP
  • # … Select the presence or absence of the latch type protection function.
    A: with Latch type protection function
    B: without Latch type protection function

DOCUMENT/CONTACT

Purchase

Technical Support

Package*1 Reliability*2
HSOP-18 R1270S (-KE) *3
R1270S (-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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