RICOH R1172x Technical data

R1172x SERIES

SUPER LOW ON RESISTANCE / LOW VOLTAGE 1A LDO

NO.EA-122-111027

OUTLINE

The R1172x Series are CMOS-based positive voltage regulator ICs. The R1172x Series have features of super low dropout, 1A output current capability. Even the output voltage is set at 1.5V, on resistance of internal FET is typically 0.32Ω. Therefore, applications that require a large current at small dropout are suitable for the R1172x series. Low input voltage is acceptable and low output voltage can be set. The minimum input voltage is 1.4V, and the lowest set output voltage is 0.8V. Each of these ICs consists of a voltage reference unit, an error amplifier, resistor net for setting output voltage, a current limit circuit at over-current, a chip enable circuit, a thermal-shutdown circuit, and so on. A stand-by mode with ultra low consumption current can be realized with the chip enable pin. The output voltage of R1172 is fixed in the IC.

Since the packages for these ICs are SOT-23-5, SOT-89-5, HSON-6, and HSOP-6J with high power dissipation, high density mounting of the ICs on boards is possible.

FEATURES

•	Output Current ............................................................	1A
• Supply Current .............................................................		Typ. 60μA
• Standby Current ..........................................................		Typ. 0.1μA
•	Input Voltage Range ...................................................	1.4V to 6.0V
•	Output Voltage..............................................................	0.8V to 5.0V (0.1V steps)
		(For other voltages, please refer to MARK INFORMATIONS.)
• Dropout Voltage............................................................		Typ. 0.32V (VOUT=1.5V, IOUT=1A)
		Typ. 0.18V (VOUT=2.8V, IOUT=1A)
• Ripple Rejection ...........................................................		Typ. 70dB (VOUT=2.8V)
• Output Voltage Accuracy..............................................		±2.0%
•	Temperature-Drift Coefficient of Output Voltage ..........	Typ. ±100ppm/°C
•	Line Regulation ............................................................	Typ. 0.05%/V
• Load Regulation .........................................................		Typ. 15mV at IOUT=300mA, Typ. 50mV at IOUT=1A
•	Packages ....................................................................	SOT-23-5, SOT-89-5, HSON-6, HSOP-6J
•	Built-in Inrush current limit circuit ...............................	Typ. 500 mA
•	Built-in Fold-Back Protection Circuit ...........................	Typ. 250mA (Current at short mode)
•	Built-in Thermal Shutdown Circuit ..............................	Thermal Shutdown Temperature ; Typ. 150°C
		Released Temperature ; Typ. 120°C
•	Built-in Auto Discharge Function ................................	D Version
• Output capacitors .......................................................		CIN=COUT=Tantalum 4.7μF (VOUT < 1.0V)
		CIN=COUT=Ceramic 4.7μF (VOUT => 1.0V)

APPLICATIONS

•Local Power source for Notebook PC.

•Local Power source for portable communication equipments, cameras, and VCRs.

•Local Power source for home appliances.

1

R1172x

BLOCK DIAGRAMS

R1172xxx1A

VDD VOUT

Vref

Current Limit
Thermal Shutdown
CE	GND
R1172xxx1B	R1172xxx1D

VDD	VOUT	VDD	VOUT
	Vref		Vref

	Current Limit		Current Limit
	Thermal Shutdown		Thermal Shutdown
CE	GND	CE	GND

SELECTION GUIDE

The output voltage, chip-enable polarity, auto discharge function, and package for the ICs can be selected at the user’s request.

Product Name	Package	Quantity per Reel	Pb Free	Halogen Free
R1172Nxx1 -TR-FE	SOT-23-5	3,000 pcs	Yes	Yes
R1172Hxx1 -T1-FE	SOT-89-5	1,000 pcs	Yes	Yes
R1172Dxx2 -TR-FE	HSON-6	3,000 pcs	Yes	Yes
R1172Sxx1 -E2-FE	HSOP-6J	1,000 pcs	Yes	Yes

xx: The output voltage can be designated in the range from 0.8V(08) to 5.0V(50) in 0.1V steps. (HSOP-6J : 0.8V to 3.5V)

(For other voltages, please refer to MARK INFORMATIONS.)

: CE pin polarity and auto discharge function at off state are options as follows.

(A) "L" active, without auto discharge function at off state

(B) "H" active, without auto discharge function at off state

(D) "H" active, with auto discharge function at off state

2

R1172x

PIN CONFIGURATIONS

z SOT-23-5

5 4

(mark side)

1 2 3

z SOT-89-5

5 4

1 2 3

z HSON-6

zHSOP-6J

Top View

6	5	4
1	2	3

Bottom View

6

5

4

4 5 6

3	2		1
					1			2			3

PIN DESCRIPTIONS

• SOT-23-5
	Pin No.			Symbol			Description
	1			VOUT			Voltage Regulator Output Pin
	2			GND			Ground Pin
	3			VDD			Input Pin
	4			NC			No Connection
	5					or CE	Chip Enable Pin
				CE
• SOT-89-5
	Pin No.			Symbol			Description
	1				or CE		Chip Enable Pin
			CE
	2			GND			Ground Pin
	3			NC			No Connection
	4			VDD			Input Pin
	5			VOUT			Voltage Regulator Output Pin
• HSON-6
	Pin No.			Symbol			Description
	1			VOUT*1			Voltage Regulator Output Pin
	2			VOUT*1			Voltage Regulator Output Pin
	3					or CE	Chip Enable Pin
				CE
	4			GND			Ground Pin
	5			VDD*1			Input Pin
	6			VDD*1			Input Pin
	) Tab and tab suspension leads in the						parts are GND level.
	(They are connected to the reverse side of the IC.)

The tab is better to be connected to the GND, but leaving it open is also acceptable.

The tab suspension leads should be open and do not connect to other wires or land patterns.1) The VOUT pin and VDD pin must be wired each other when it is mounted on board.

3

R1172x

• HSOP-6J

Pin No.		Symbol		Description
1		VOUT		Voltage Regulator Output Pin
2		GND*1		Ground Pin
3			or CE	Chip Enable Pin
		CE
4		NC		No Connection
5		GND*1		Ground Pin
6		VDD		Input Pin

1) The GND pin must be wired together when it is mounted on board.

ABSOLUTE MAXIMUM RATINGS

	Symbol			Item	Rating	Unit
	VIN	Input Voltage			6.5	V
	VCE	Input Voltage (		or CE Input Pin)	−0.3 to 6.5	V
			CE
	VOUT	Output Voltage			−0.3 to VIN+0.3	V
		Power Dissipation (SOT-23-5) *			420
	PD	Power Dissipation (SOT-89-5) *			900	mW
		Power Dissipation (HSON-6) *			900
		Power Dissipation (HSOP-6J) *			1700
	Topt	Operating Temperature Range			−40 to 85	°C
	Tstg	Storage Temperature Range			−55 to 125	°C

) For Power Dissipation, please refer to PACKAGE INFORMATION.

ABSOLUTE MAXIMUM RATINGS

Electronic and mechanical stress momentarily exceeded absolute maximum ratings may cause the permanent damages and may degrade the life time and safety for both device and system using the device in the field.

The functional operation at or over these absolute maximum ratings is not assured.

RECOMMENDED OPERATING CONDITIONS (ELECTRICAL CHARACTERISTICS)

All of electronic equipment should be designed that the mounted semiconductor devices operate within the recommended operating conditions. The semiconductor devices cannot operate normally over the recommended operating conditions, even if when they are used over such conditions by momentary electronic noise or surge. And the semiconductor devices may receive serious damage when they continue to operate over the recommended operating conditions.

4

R1172x

ELECTRICAL CHARACTERISTICS

• R1172xxx1A

Topt=25°C

Symbol

Item

Conditions

Min.

Typ.

Max.

Unit

VIN

Input Voltage

1.4

6.0

V

ISS

Supply Current

VIN−VOUT=1.0V, VCE=0V,

60

100

μA

IOUT =0A

Istandby

Standby Current

VIN= 6.0V, VCE=VIN

0.1

1.0

μA

VOUT

Output Voltage

VIN−VOUT=1.0V

VOUT > 1.5V

×0.98

×1.02

V

IOUT=100mA

VOUT =< 1.5V

−30

+30

mV

VIN−VOUT=0.3V

1mA =< IOUT =< 300mA

−15

15

30

VOUT/

Load Regulation

If VOUT =< 1.1V, then VIN=1.4V

mV

IOUT

VIN−VOUT=0.3V

1mA =< IOUT =< 1A

50

If VOUT =< 1.1V, then VIN=1.7V

VDIF

Dropout Voltage

Refer to Dropout Voltage Table

VOUT/

IOUT=100mA

Line Regulation

VOUT+0.5V =< VIN =< 6.0V

0.05

0.20

%/V

VIN

If VOUT =< 0.9V,

1.4V =< VIN =< 6.0V

f=1kHz (VOUT =< 4.0V)

70

f=1kHz (VOUT > 4.0V)

60

RR

Ripple Rejection

Ripple 0.5Vp-p, VIN−VOUT=1.0V,

dB

IOUT=100mA

If VOUT =< 1.2V, VIN−VOUT=1.5V,

IOUT=100mA

VOUT/

Output Voltage

IOUT=100mA

±100

ppm/°C

Topt

Temperature Coefficient

−40°C =< Topt =< 85°C

ILIM

Output Current

VIN−VOUT=1.0V

1

A

ISC

Short Current Limit

VOUT=0V

250

mA

RPU

Pull-up Resistance for

pin

1.9

5.0

15.0

MΩ

CE

VCEH

Input Voltage "H"

1.0

6.0

V

CE

VCEL

Input Voltage "L"

0

0.4

V

CE

TTSD

Thermal Shutdown

Junction Temperature

150

°C

Temperature

TTSR

Thermal Shutdown

Junction Temperature

120

°C

Released Temperature

en

Output Noise

BW=10Hz to 100kHz

30

μVrms

5

R1172x

• R1172xxx1B/D

Topt=25°C

Symbol

Item

Conditions

Min.

Typ.

Max.

Unit

VIN

Input Voltage

1.4

6.0

V

ISS

Supply Current

VIN−VOUT=1.0V, VIN=VCE,

60

100

μA

IOUT=0A

Istandby

Standby Current

VIN= 6.0V, VCE=0V

0.1

1.0

μA

IN

OUT

VOUT > 1.5V

×

0.98

×

1.02

V

VOUT

Output Voltage

V −V

=1.0V

IOUT=100mA

VOUT =< 1.5V

−30

+30

mV

VIN−VOUT=0.3V

1mA =< IOUT =< 300mA

−15

15

30

VOUT/

Load Regulation

If VOUT =< 1.1V, then VIN=1.4V

mV

IOUT

VIN−VOUT=0.3V

50

1mA =< IOUT =< 1A

If VOUT =< 1.1V, then VIN=1.7V

VDIF

Dropout Voltage

Refer to Dropout Voltage Table

VOUT/

IOUT=100mA

Line Regulation

VOUT+0.5V =< VIN =< 6.0V

0.05

0.20

%/V

VIN

If VOUT =< 0.9V,

1.4V =< VIN =< 6.0V

f=1kHz (VOUT =< 4.0V)

70

f=1kHz (VOUT > 4.0V)

60

RR

Ripple Rejection

Ripple 0.5Vp-p, VIN−VOUT=1.0V

dB

IOUT=100mA

If VOUT =< 1.2V, VIN−VOUT=1.5V,

IOUT=100mA

VOUT/

Output Voltage

IOUT=100mA

±100

ppm/°C

Topt

Temperature Coefficient

−40°C =< Topt =< 85°C

ILIM

Output Current

VIN−VOUT=1.0V

1

A

ISC

Short Current Limit

VOUT=0V

250

mA

RPD

Pull-down Resistance for CE

1.9

5.0

15.0

MΩ

pin

VCEH

CE Input Voltage "H"

1.0

6.0

V

VCEL

CE Input Voltage "L"

0

0.4

V

TTSD

Thermal Shutdown

Junction Temperature

150

°C

Temperature

TTSR

Thermal Shutdown

Junction Temperature

120

°C

Released Temperature

en

Output Noise

BW=10Hz to 100kHz

30

μVrms

6

R1172x

• Dropout Voltage by Output Voltage									Topt=25°C
	Output Voltage					Dropout Voltage		VDIF (V)
						IOUT=300mA			IOUT=1A
		VOUT (V)
					Typ.		Max.		Typ.
	0.8	<	VOUT < 0.9		0.33		0.57		0.72
		=
	0.9	<	VOUT < 1.0		0.22		0.47		0.64
		=
	1.0	<	VOUT < 1.5		0.18		0.32		0.56
		=
	1.5	<	VOUT < 2.6		0.10		0.15		0.32
		=
	2.6		<		0.05		0.10		0.18
			= VOUT

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R1172x

TYPICAL APPLICATION (R1172xxx1B/D)

VDD

VOUT

VOUT

		R1172x
	C1				C2
		Series

CE

GND

TECHNICAL NOTES

When using these ICs, consider the following points:

Phase Compensation

In these ICs, phase compensation is made for securing stable operation even if the load current is varied. For this purpose, use a capacitor C2 with good frequency characteristics and ESR (Equivalent Series Resistance).

The recommendation value is as follows.

	Output Voltage	C2 recommendation value		Components Recommendation
	VOUT < 1.0V	Tantalum 4.7μF or more
	1.0 =< VOUT =< 3.3V		Kyocera	4.7μF (1608)	Part Number : CM105X5R475M06AB
		Ceramic 4.7μF or more	Murata	4.7μF (1608)	Part Number : GRM188R60J475KE19B
			Murata	10μF (1608)	Part Number : GRM188B30G106ME46B
	3.3V < VOUT	Ceramic 4.7μF or more	Kyocera	4.7μF (thin 2012)	Part Number : CT21X5R475M06AB
			Murata	10μF (2012)	Part Number : GRM21BB30J106K

If you use a tantalum type capacitor and ESR value of the capacitor is large, output might be unstable. Evaluate your circuit with considering frequency characteristics.

Depending on the capacitor size, manufacturer, and part number, the bias characteristics and temperature characteristics are different. Evaluate the circuit with actual using capacitors.

PCB Layout

Make VDD and GND lines sufficient. If their impedance is high, noise pickup or unstable operation may result. Connect a capacitor C1 with a capacitance value as much as 4.7μF or more between VDD and GND pin, and as close as possible to the pins.

Set external components, especially the output capacitor C2, as close as possible to the ICs, and make wiring as short as possible.

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