RICOH R1191x User Manual

R1191x SERIES

300mA LDO REGULATOR with the Reverse Current Protection

NO.EA-229-111026

OUTLINE

R1191x Series are a low supply current voltage regulator with high output voltage accuracy. The maximum operating voltage is 16V. These ICs can switch to the fast mode and the low power mode by the low power / fast mode changer pin (ECO pin) without changing the output voltage value.

Each of these ICs consists of a voltage reference unit, an error amplifier, a resistor-net for voltage setting, a short current limit circuit, a thermal shutdown circuit and a chip enable circuit.

Moreover, the R1191x Series has the reverse current protection function, which protects the reverse current flow into VDD pin when the output pin voltage becomes higher than the VDD pin voltage. Thus it is suitable for the back-up circuit.

Since the packages for these ICs are SOT-89-5, SOT-23-5 and DFN1616-6, therefore high density mounting of the ICs on boards is possible.

FEATURES

• Supply Current .....................................................		Typ. 50μA (Fast Mode),
		Typ. 6.0μA (Low Power Mode)
• Standby Mode ......................................................		Typ. 0.3μA
• Reverse Current...................................................		Max. 0.1μA
•	Output Current .....................................................	Min. 300mA
•	Input Voltage Range ............................................	3.5V to 16.0V
•	Output Voltage Range..........................................	2.0V to 15.0V (0.1V steps)
		(For other voltages, please refer to MARK INFORMATIONS.)
• Output Voltage Accuracy......................................		±1.5% (Fast Mode)
		±2.5% (Low Power Mode)
•	Temperature-Drift Coefficient of Output Voltage ..	Typ. ±80ppm/°C
• Dropout Voltage ...................................................		Typ. 0.55V (Fast Mode, IOUT=300mA ,VOUT=5.0V)
		Typ. 0.70V (Low Power Mode, IOUT=300mA,VOUT=5.0V)
• Ripple Rejection...................................................		Typ. 60dB (f=1kHz,VOUT=5.0V, Fast Mode)
•	Line Regulation ....................................................	Typ. 0.02%/V (Fast Mode)
•	Packages ............................................................	DFN1616-6, SOT-23-5, SOT-89-5
•	Built-in fold-back protection circuit .......................	Typ. 50mA (Current at short mode)
•	Built-in Thermal Shutdown Circuit........................	Shutdown Temperature at 150°C

• Ceramic capacitors are recommended to be used with this IC ····CIN=2.2μF or more, COUT=4.7μF or more

APPLICATIONS

•Power source for digital home appliances

•Power source for audio visual equipment

1

R1191x

BLOCK DIAGRAM

R1191xxxxB	R1191xxxxD
ECO	ECO

	Thermal Shutdown		Thermal Shutdown
VDD	VOUT	VDD	VOUT

Vref		Vref
Short	Peak	Short	Peak
	Current		Current
Protection	Protection	Protection	Protection

	Reverse	Reverse
	Detector	Detector
CE	GND CE	GND

SELECTION GUIDE

The output voltage, 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
R1191Lxxx -TR	DFN1616-6	5,000 pcs	Yes	Yes
R1191Nxxx -TR-FE	SOT-23-5	3,000 pcs	Yes	Yes
R1191Hxxx -T1-FE	SOT-89-5	1,000 pcs	Yes	Yes

xxx : The output voltage can be designated in the range from 2.0V(020) to 15.0V(150) in 0.1V steps. (For other voltages, please refer to MARK INFORMATIONS.)

: The auto discharge function at off state are options as follows.

(B) without auto discharge function at off state.

(D) with auto discharge function at off state.

2

R1191x

PIN CONFIGURATIONS

		• DFN1616-6*1										• SOT-23-5												• SOT-89-5
Top View				Bottom View					5									4			5				4
6	5	4	4			5	6
													(mark side)
1	2	3
			3			2	1														1			2	3
									1				2					3

PIN DISCRIPTIONS

• DFN1616-6*1

Pin No	Symbol	Pin Description
1	ECO	Low Power / Fast Mode Changer Pin ("H": Fast Mode)
2	NC	No Connection
3	VDD	Input Pin
4	VOUT	Output pin
5	GND	Ground Pin
6	CE	Chip Enable Pin ("H" Active)

1) Tab is GND level. (They are connected to the reverse side of this IC.)

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

• SOT-23-5

Pin No	Symbol	Pin Description
1	ECO	Low Power / Fast Mode Changer Pin ("H": Fast Mode)
2	GND	Ground Pin
3	CE	Chip Enable Pin ("H" Active)
4	VOUT	Output pin
5	VDD	Input Pin
• SOT-89-5
Pin No	Symbol	Pin Description
1	VOUT	Output pin
2	GND	Ground Pin
3	CE	Chip Enable Pin ("H" Active)
4	ECO	Low Power / Fast Mode Changer Pin ("H": Fast Mode)
5	VDD	Input Pin

3

R1191x

ABSOLUTE MAXIMUM RATINGS

Symbol	Item	Rating	Unit
VIN	Input Voltage	−0.3 to 18.0	V
VCE	Input Voltage (CE Pin)	−0.3 to 18.0	V
VECO	Input Voltage (ECO Pin)	−0.3 to VIN + 0.3 ≤ 18.0	V
VOUT	Output Voltage	−0.3 to 18.0	V
IOUT	Output Current	400	mA
	Power Dissipation (DFN1616-6)*	640
PD			mW
	Power Dissipation (SOT-23-5)*	420
	Power Dissipation (SOT-89-5)*	900
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

R1191x

ELECTRICAL CHARACTERISTICS

VIN=VCE=Set VOUT+3.0V (Max.16V), CIN=2.2μF, COUT=4.7μF IOUT=1mA, unless otherwise noted. The values in are applicable under the condition of −40°C ≤ Topt ≤ 85°C.

R1191xxxxB/D

Topt=25°C

Symbol

Item

Conditions

Min.

Typ.

Max.

Unit

Fast Mode

VECO=VIN

Topt=25°C

×0.985

×1.015

VOUT

Output Voltage

−40°C ≤ Topt

≤85°C

×0.970

×1.030

V

Low Power

VECO=0V

Topt=25°C

×0.975

×1.025

Mode

−40°C ≤ Topt

≤85°C

×0.960

×1.040

VOUT

Output Voltage Deviation between Fast Mode and Low Power Mode

0

%

−1.5

1.5

IOUT

Output Current

300

mA

Fast Mode

VECO=VIN,

50

120

VOUT/

Load Regulation

1mA ≤ IOUT ≤ 300mA

mV

IOUT

ECO

=GND,

Low Power

V

60

130

Mode

1mA ≤ IOUT ≤ 300mA

VDIF

Dropout Voltage

Refer to the following table

ISS1

Supply Current (Fast Mode)

VECO=VIN, IOUT=0mA

50

μA

100

ISS2

Supply Current

VECO=GND, IOUT=0mA

6

15

μA

(Low Power Mode)

Istandby

Supply Current (Standby)

VIN=16V, VCE=0V

0.3

1.0

μA

(If VOUT < 3.0V, VIN=14V)

VOUT/

Line Regulation

Set VOUT+0.5V ≤ VIN ≤ 16V

0.02

%/V

0.10

VIN

(If Set VOUT < 3.0V, 3.5V ≤ VIN ≤ 14V)

f=1kHz, IOUT=30mA

2.0V≤VOUT<5.0V

70

RR

Ripple Rejection

Ripple 0.2Vp-p,

dB

5.0V≤VOUT<12V

60

VIN=VECO=

Set VOUT+1V

12V ≤ VOUT

60

2.0V ≤ VOUT < 3.0V

VIN

Input Voltage

14.0

V

3.5

3.0V ≤ VOUT

16.0

VOUT/

Output Voltage

−40°C ≤ Topt ≤85°C

±80

ppm

Topt

Temperature Coefficient

/°C

ISC

Short Current Limit

VOUT=0V

50

mA

VCEH

CE, ECO Input Voltage "H"

VIN

V

1.6

VCEL

CE, ECO Input Voltage "L"

0

V

0.6

TTSD

Thermal Shutdown

Junction Temperature

150

°C

Temperature

TTSR

Thermal Shutdown

Junction Temperature

130

°C

Released Temperature

RLOW

Low Output Nch Tr. ON

VIN=5V, VCE=0V, VOUT=0.3V

150

Ω

Resistance (of D Version)

IREV

Reverse Current

VOUT> 0.6V, 0V ≤ VIN ≤ 16V

0

μA

0.1

) The values in

have been tested and guaranteed by Design Engineering.

All test categories were tested on the products under the pulse load condition (Tj≈Ta=25°C) except the

following test categories: ripple rejection, output voltage temperature coefficient, and thermal shutdown.

5

R1191x

ELECTRICAL CHARACTERISTICS by OUTPUT VOLTAGE

Topt=25°C

Output Voltage		Dropout Voltage VDIF (V)
			ECO="H"						ECO="L"
VOUT (V)	Condition
		Typ.			Max.			Typ.		Max.
2.0 ≤ VOUT < 2.5		1.20						2.5
					1.80						3.0
2.5 ≤ VOUT < 3.3		1.00						2.0
					1.50						2.5
	IOUT=300mA
3.3 ≤ VOUT < 5.0		0.75						1.5
					1.00						1.8
5.0 ≤ VOUT < 12.0		0.55						0.7
					0.75						1.0
12.0 ≤ VOUT		0.40						0.4
					0.60						0.6

TYPICAL APPLICATION

VDD

VOUT

VOUT

C2

							C1	R1191x
VIN
								Series

ECO

CE GND

(External Components)

Ex. C1: Ceramic Capacitor 2.2μF Murata GRM32RB11E225KC01B

C2: Ceramic Capacitor 4.7μF Murata GCM31CR71E475KA40

6

R1191x

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).

(Note: If additional ceramic capacitors are connected with parallel to the output pin with an output capacitor for phase compensation, the operation might be unstable. Because of this, test these ICs with as same external components as ones to be used on the PCB.)

• 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 2.2μF or more between VDD and GND pin, and as close as possible to the pins.

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

• Thermal Shutdown Function

There is the built-in thermal-shutdown function in R1191x series. It discontinues operation of the IC when the junction temperature becomes over 150°C (Typ.) and IC re-operates when the junction temperature under 130°C (Typ.). If the temperature increasing keeps the IC repeats ON and OFF operating. The output becomes the pulse condition.

• Chip Enable (CE) Circuit and High-speed/ Low Supply Current Switching (ECO) Circuit

To maintain the stability of the output voltage, please do not use the intermediate electric potentials (the voltage values between VCEH and VCEL) for the CE pin and the ECO pin. The use of the intermediate electric potentials increases the supply current and causes the unstable output voltage.

• Auto-discharge Function

R1191xxxxD has adopted Auto-discharge function, which decreases the output voltage quickly to 0V by turning on the transistor between VOUT pin and GND pin when switching “Active” to “Standby” and releases the electrical charges accumulated in the external capacitor.

7

R1191x

TEST CIRCUITS

VDD	VOUT	VOUT	IOUT
	C2

C1	R1191x	V	↓
	Series

GND

CE ECO

C1=Ceramic 2.2μF

C2=Ceramic 4.7μF

Basic Test Circuit

	ISS	VDD	VOUT	VOUT
				C2
A	C1	R1191x
		Series
			GND
		CE	ECO

C1=Ceramic 2.2μF

C2=Ceramic 4.7μF

Test Circuit for Supply Current

	VDD	VOUT
Pulse		C2	IOUT
Generator	R1191x		↓
P.G.	Series
		GND
	CE	ECO
			C1=Ceramic 2.2μF
			C2=Ceramic 4.7μF

Test Circuit for Ripple Rejection

8

R1191x

VDD	VOUT	VOUT
		C2

		C1	R1191x
	VIN		Series	IOUT a		IOUT b
			GND
				↓	V

CE ECO

C1=Ceramic 2.2μF

C2=Ceramic 4.7μF

Test Circuit for Load Transient Response

9

R1191x

TYPICAL CHARACTERISTICS

1) Output Voltage vs. Output Current (C1=2.2μF, C2=4.7μF, Topt=25°C)

		R1191x020x		ECO=H
	2.5
(V)	2.0
VOUT	1.5
Voltage
	1.0			VIN=3.5V
Output
	0.5			VIN=3.8V
				VIN=4.0V
				VIN=4.5V
	0			VIN=5.0V
	0	200	400	600	800

Output Current IOUT (mA)

		R1191x050x		ECO=H
	6
VOUT (V)	5
	4	VIN=5.5V
Voltage		VIN=5.55V
	3	VIN=5.7V
		VIN=6.0V
	2	VIN=7.0V
Output		VIN=8.0V
	1
	0
	0	200	400	600	800

Output Current IOUT (mA)

		R1191x150x		ECO=H
	16
(V)	14
	12
VOUT
	10	VIN=15.4V
Voltage		VIN=15.5V
	8	VIN=15.6V
	6	VIN=15.75V
		VIN=16.0V
Output	4
	2
	0
	0	200	400	600	800

Output Current IOUT (mA)

		R1191x020x		ECO=L
	2.5
(V)	2.0
VOUT	1.5
Voltage
	1.0			VIN=3.5V
Output
	0.5			VIN=3.8V
				VIN=4.0V
				VIN=4.5V
	0			VIN=5.0V
	0	200	400	600	800

Output Current IOUT (mA)

		R1191x050x		ECO=L
	6
VOUT (V)	5
	4	VIN=5.5V
Voltage		VIN=5.55V
	3	VIN=5.7V
		VIN=6.0V
	2	VIN=7.0V
Output		VIN=8.0V
	1
	0
	0	200	400	600	800

Output Current IOUT (mA)

		R1191x150x		ECO=L
	16
(V)	14
	12
VOUT
	10	VIN=15.4V
Voltage		VIN=15.5V
	8	VIN=15.6V
	6	VIN=15.75V
		VIN=16.0V
Output	4
	2
	0
	0	200	400	600	800

Output Current IOUT (mA)

10