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R1287 Series
PWM/VFM, Dual-channel Step-up/Inverting DCDC Converter with Synchronous Rectifier for LCD

Product Specifications

The R1287 Series are CMOS-based PWM/VFM dual-channel step-up/inverting DC/DC converters with synchronous rectifier for LCD.
The R1287 includes a soft-start circuit, an under-voltage lockout circuit (UVLO), a latch-type short circuit protection, and a thermal shutdown circuit.
By simply using two inductors and three capacitors as external components, a high-efficiency step-up/inverting DC/DC converter can be easily configured.

The R1287 provides two control types: the PWM control and the PWM/VFM auto switching control.
Both CH1 and CH2 can independently control the ON/ OFF control and freely set the starting sequence and shutdown sequence.
Both CH1 and CH2 own an auto-discharge function which actively discharges the output voltage to ground within a short time in shutdown mode.

The R1287 is used for the application of the LCD.

FEATURES

Input Voltage Range (Maximum Rating) 2.5 V ~ 5.5 V (6.0 V)
Supply Current Typ. 470 µA (No switching)
Standby Current Typ. 0.1 µA (EN1 / EN2="L")
Step-up Output Voltage 4.5 V to 5.8 V (internally fixed),
4.5 V to 5.8 V (Externally adjustable, VFBP : 1 V) (001)
Inverting Output Voltage -4.5 V to -5.8 V (internally fixed),
-4.5 V to -6.0 V (Externally adjustable, VFBN : 0 V) (001)
Output Voltage Accuracy (internally fixed) Step-up : ± 0.9%, Inverting : ± 1%
Feedback Voltage Accuracy Step-up : ± 15mV, Inverting : ± 30mV
Output Current Step-up/Inverting: 200 mA (B/D/F/H), 100 mA (C/G)
Oscillator Frequency Step-up: 900 kHz (B/F), 300 kHz (C/G), 1 MHz (D/H)
Inverting: 1.1 MHz (B/F), 300 kHz (C/G), 1 MHz (D/H)
Maximum Duty Cycle Step-up / Inverting: Typ. 90% (B/D/F/H), Typ. 97% (C/G)
UVLO Detect Voltage Typ. 2.25V
Soft Start Time Step-up: Typ. 4.5 ms (C/D/G/H), Max. 5.54 ms (B/F)
Inverting: Typ. 2.6 ms (C/D/G/H), Max. 4.11 ms (B/F)
Coil-current Limit Circuit Step-up: Typ. 1.1 A, Inverting: Typ. 1.5 A
Latch Protection Circuit Delay time for protection Typ. 30 ms
Thermal Shutdown Circuit Stops at 150°C
Function Auto-discharge Function
Package WLCSP-12-P1, DFN3030-12

APPLICATION INFORMATION

Fixed Output Voltage Type

C1(CIN),C2(COUTP),C3(COUTN): 10µF

TYPICAL CHARACTERISTICS

Efficiency vs. Output Current

R1287x001B (Ta=25°C)

R1287x001C (Ta=25°C)

PIN DESCRIPTION

WLCSP-12-P1

WLCSP-12-P11.97 mm × 1.47 mm
A1 VOUTN
A2 PGND
A3 LXP
B1 LXN
B2 GND
B3 VOUTP
C1 PVCC
C2 VCC
C3 VOUTPS (xxxy)
VFBP (001y)
D1 VOUTNS (xxxy)
VFBN (001y)
D2 EN2
D3 EN1

DFN3030-12

DFN3030-123.0 mm × 3.0 mm
1 EN2
2 VOUTNS (xxxy)
VFBN (001y)
3 VCC
4 PVCC
5 LXN
6 VOUTN
7 PGND
8 LXP
9 VOUTP
10 VOUTPS (xxxy)
VFBP (001y)
11 GND
12 EN1

*) The tab is substrate level (GND).


R1287 Series for Consumer

APPLICATIONS

  • Power source for hand-held equipment
  • Power source for LCD

PRODUCT LONGEVITY PROGRAM

R1287L 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 output voltage types are user-selectable options that can be selected from either fixed output voltage type or adjustable output voltage type. With the fixed output voltage type, the combination of a CH1 output voltage and a CH2 output voltage can be selected. The combination of an oscillator frequency, a power controlling method, and a discharge current can also be selected.

Product Name   Package Quantity per Reel
R1287Zxxxy-E2-F Consumer WLCSP-12-P1 4,000
R1287Lxxxy-TR ConsumerPLP DFN3030-12 3,000
  • xxx … Specify the set output voltage (VSET).
    001: Adjustable Output Voltage Type, The output voltage is adjustable using external resistors.
    002 to 009: Fixed Output Voltage Type (009 is only available for R1287Z.)
    CH1 Output Voltage (VOUTP): selectable from +4.5 V to +5.8 V by 0.1 V step (0.05 V step is also available as a custom code.)
    CH2 Output Voltage (VOUTN): selectable from −4.5 V to −5.8 V by 0.1 V step (0.05 V step is also available as a custom code.)
  • y … Specify the oscillator frequency, the power controlling method, and the discharge current.
  Oscillator Frequency Power Controlling Method Discharge Current
B 1 MHz PWM/ VFM Auto Switching Control 0.06 mA
C 300 kHz Normal PWM Control 0.06 mA
D 1 MHz Normal PWM Control 0.06 mA
F *1 1 MHz PWM/ VFM Auto Switching Control 0.4 mA
G *1 300 kHz Normal PWM Control 0.4 mA
H *2 1 MHz Normal PWM Control 0.4 mA

*1: F/G versions are only available for R1287Z.
*2: H version is only available for R1287Z and R1287L002H, R1287L003H, R1287L007H.

DOCUMENT/CONTACT

Purchase

Technical Support

Package *1 Marking Reliability *2
WLCSP-12-P1 R1287Z R1287Z
DFN3030-12 R1287L R1287L

*1: The pwackage file includes package dimensions, taping specifications, taping reels dimensions, and power dissipations.
*2: Reliability file includes a reliability test report and a reflow profile.

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