RICOH R1172x Series 1A LDO Data Sheet

R1172x Series

1A LDO

The R1172x Series are CMOS-based LDO regulators featuring 1A output. The CMOS process provides both high output current and low supply current. The dropout voltage is significantly lower than bipolar regulators. The R1172x handles low voltage with an input voltage from 1.4V and output voltage from 0.8V. Accordingly, the device supports highly integrated, low voltage-driven LSI as a rear stage of the DC/DC converter. The CE pin can switch the regulator into standby mode. In addition to a fold-back protection circuit built into conventional LDO regulators, R1172x has a thermal shutdown circuit and inrush current limit circuit. Ceramic capacitors can be used

FEATURES • Supply Current (ISS) ···················Typ. 60μA (VIN=SET VOUT+1.0V) • Output Voltage Accuracy ················± 2% • Standby Current (Istandby) ············Typ. 0.1μA (VIN=6.0V, In standby) • Temp. coeff. of Output Voltage········Typ. ± 100ppm/°C • Dropout Voltage (VDIF) ···············Typ. 0.05V (IOUT=300m A, VOUT=2.8V) • Line Regulation·······························Typ. 0.05%/V

Typ. 0.18V (IOUT=1A, VOUT=2.8V) • Fold-back Protection Circuit············Current limit Typ. 250m A

• Ripple Rejection (RR)················Typ. 70d B (f=1k Hz, VOUT ≤ 4.0V), • Inrush Current Limit Circuit ·············Typ. 500m A

Typ. 60d B (f=1k Hz, VOUT > 4.0V) • Thermal Shutdown Circuit ··············Stops at 150°C

• Input Voltage Range (VIN) ··········1.4V to 6.0V • Packages ········································SOT-23-5, SOT-89-5, HSON-6, • Output Voltage Range (VOUT)·····0.8V to 5.0V (internally fixed) HSOP-6J

• Ceramic capacitors can be used. ···4.7μF or more (VOUT ≥ 1.0V)

BLOCK DIAGRAMS

R1172xxx1A R1172xxx1B R1172xxx1D CE pin "L" active) (CE pin "H" active) (With Auto-Discharge function)

ro lt IF (m

VDD VOUT VDD VOUT VDD VOUT

Vref Vref Vref

Current Limit Current Limit Current Limit Thermal Shutdown Thermal Shutdown Thermal Shutdown

CE GND CE GND CE GND

SELECTION GUIDES

.xx. : Specify the output voltage within the range of 0.8V (.08.) to 5.0V (.50.)

Halogen Free Package Q'ty per Reel Part No.

in 0.1V steps.

SOT-23-5 3,000 pcs R1172N.xx.1.∗ -TR-FE

.∗ : Select the polarity of the CE pin from (.A.) "L" active, (.B.) "H" active or

SOT-89-5 1,000 pcs R1172H.xx.1.∗ -T1-FE

(.D.) "H" active with auto-discharge function.

HSON-6 3,000 pcs R1172D.xx.1.∗ -TR-FE HSOP-6J 1,000 pcs R1172S.xx.1.∗ -E2-FE

PACKAGES (Top View) TYPICAL CHARACTERISTIC

SOT-23-5 SOT-89-5 HSON-6 HSOP-6J R1172x301x Dropout Voltage vs. Output Current

1 VOUT 1 CE or CE 1 VOUT 1 VOUT

2 GND 2 GND 2 VOUT 2 GND 3 VDD 3 NC 3 CE or CE 3 CE or CE 4 NC 4 VDD 4 GND 4 NC

5 CE or CE 5 VOUT 5 VDD 5 GND

6 VDD 6 VDD

Output Current IOUT(m A)

∗) The tab and tab suspension leads on back side are substrate level (GND). ∗1) The VOUT pin and VDD pin must be wired each other when it is mounted on board.

APPLICATIONS • Power source for hand-held communication equipment, cameras, and VCRs • Power source for laptop personal computers • Power source for home appliances and digital home appliances • Power source for battery-powered equipment • Power source for automotive application

No.EK-122-101001 CMOS LDO Regulator