Epson SCI7661C0A, SCI7661M0A, SCI7661MAA Datasheet

Voltage

LowOperation

Products

PF110-10

SCI7661COA/MOA

DC-DC Converter

●95% Typical Power Efficiency

●Doubled or Tripled Output Voltage

●Internal Voltage Regulator

■ DESCRIPTION

The SCI7661COA/MOACMOS DC-DC Converter features high operational performance with low power dissipation. It consists of two major parts: the booster circuitry and the regulator circuitry. The booster generates a doubled output voltage(–2.4 to –12V) or tripled output voltage(–3.6 to –18V) from the input (–1.2 to –6V). The regulator is capable of setting the output to any desired voltage. The regulated voltage can be given one of the three threshold temperature gradients.

■FEATURES

●High performance with low power dissipation

●Simple conversion of VIN (–5V) to |VIN| (+5V), 2 |VIN| (+10V), 2VIN (–10V) or 3VIN(–15V)

●On-chip output voltage regulator

●Power conversion efficiency–Typ. 95%

●Temperature gradient for LCD power supply – 0.1% / °C, 0.4%/°C or 0.6%/ °C

●Power off by external signals – Stationary current at power off – Max. 2 μA

●Cascade connection–two device connected: VIN=–5V, VOUT=–20V

●On-chip C'–R oscillator

●Package .................................... SCI7661C0A: DIP-14pin(plastic)

SCI7661M0A: SOP5-14pin(plastic)

SCI7661MAA: SSOP2-16pin(plastic)

■ BLOCK DIAGRAM

	VDD
	OSC1	CR	Reference Voltage			Temperature Gradient
	OSC2	Oscillator		Generator	Voltage Regulator		Circuit	TC1
	VIN
							T	TC2
	CAP1–	Voltage					Select
	CAP1+	Converter
		(I)						Poff
	CAP2–
								RV
		Voltage
								Vreg
	CAP2+	Converter
		(II)
								Vout
		Booster			Regurator

SCI7661COA/MOA

■ PIN CONFIGURATION

CAP1+	1	14	VDD
CAP1-	2	13	OSC1
CAP2+	3	12	OSC2
CAP2-	4	11
			Poff
TC1	5	10	RV
TC2	6	9	Vreg
VIN	7	8	Vout

The same pin configuration in DIP and SOP

■ PIN DESCRIPTION

Pin name	No.		Function
CAP1+, CAP1-	1,	2	Terminal for connection of capacitor for doubler
CAP2+, CAP2-	3,	4	Terminal for connection of capacitor for tripler
TC1, TC2	5,	6	Temperature gradient selection terminal
VIN	7		Power supply terminal(negative, system supply
			GND)
VOUT	8		Output terminal at tripling
Vreg	9		Regulated voltage output terminal
RV	10		Regulated voltage control terminal
Poff	11		Vreg output ON/OFF control terminal
OSC2, OSC1	12,	13	Oscillation resistor connection terminal
VDD	14		Power supply terminal(positive system supply
			VCC)

■ ABSOLUTE MAXIMUM RATINGS

(VDD=0V)

	Rating	Symbol	Min.	Max.	Unit	Remark
	Input supply voltage	VI	-20/N	0.5	V	N=2 : Doubler
						N=3 : Tripler
						OSC1,
	Input terminal voltage	VI	VIN-0.5	0.5	V		Poff
			VOUT-0.5	0.5	V	TC1, TC2, RV
	Output voltage	VO	-20.0		V
	Allowable loss	Pd		300	mW
	Operating temperature	Topr	-30	85	°C	Plastic package
	Storage temperature	Tstg	-55	150	°C
	Soldering temperature and time	Tsol	260°C, 10s(at lead)		-

Note: When this IC is soldered in the solder-reflow process, be sure to maintain the reflow furnace at the curve shown in "Fig. 1-5 Reflow Furnace Temperature Curve" of this DATA BOOK. And this IC can not be exposed to high temperature of the solder dipping.

■ ELECTRICAL CHARACTERISTICS

								(VDD = 0V, VIN=-5V, Ta=-30 to 85°C)
Characteristic		Symbol		Min.	Typ.	Max.	Unit	Condition
Input supply voltage		VI		-6.0		-1.2	V
Output voltage		VO		-18.0			V
		Vreg		-18		-2.6	V	RL=¥, RRV=1MΩ ,
								VO=-18V
Regulator operating voltage		VOUT		-18.0		-3.2	V
Booster current consumption		Iopr1			60	100	µA	RL=¥, ROSC=1MΩ
Regulator current		Iopr2			50	12.0	µA	RL=¥, RRV=1MΩ
consumption								VOUT=-15V
Stationary current		IQ				2.0	µA	TC2=TC1=VOUT, RL=¥
Oscillation frequency		fosc		16	20	24	kHz	ROSC=1MΩ
Output impedance		ROUT			150	200	Ω	IOUT=10mA
Booster power conversion		Peff		90	95		%	IOUT=5mA
efficiency
Regulated output voltage		DVreg			0.2		%/V	-18V<VOUT<-8V,
fluctuation		DVOUT•Vreg						Vreg=-8V, RL=¥, Ta=25°C

2

SCI7661COA/MOA

Characteristic

Symbol

Min.

Typ.

Max.

Unit

Condition

Regulated output load

DVreg

VOUT=-15V, Vreg=-8V,

5

Ω

Ta=25°C

fluctuation

DIOUT

0<IOUT<10mA, TC1=VDD

TC2=VOUT

Regulated output saturation

Ω

RSAT=D(Vreg—V OUT)/DIOUT

RSAT

5

0<IOUT<10mA, RV=VDD,

resistance

Ta=25°C

VRV0

-2.3

-1.5

-1.0

V

TC2=VOUT, TC1=VDD, Ta=25°C

Reference voltage

VRV1

-1.7

-1.3

-1.1

V

TC2=TC1=VOUT, Ta=25∞ C

VRV2

-1.1

-0.9

-0.8

V

TC2=VDD, TC1=VOUT, Ta=25°C

0

%/°C

| Vreg(50°C) | - | Vreg(0°C) |

CT

-0.25

-0.1

-0.06

CT =

Temperature Gradient

50°C-0°C

CT4

-0.5

-0.4

-0.3

%/°C

CT2

-0.7

-0.6

-0.5

%/°C

´

1

´100

| Vreg(25°C) |

Input leakage current

IL

2.0

µA

Poff, TC1, TC2, OSC1, RV pins

■ RECOMMENDED OPERATING CONDITIONS

(Ta=-30 to 85°C)

Condition

Symbol

Min.

Max.

Unit

Remark

VSTA1

-1.2

V

ROSC=1MΩ , C3≥10µF*1

Booster start voltage

CL/C3≤ 1/20, Ta=-20 to 85°C

VSTA2

-2.2

V

ROSC=1MΩ

Booster stop voltage

VSTP

-1.2

V

ROSC=1MΩ

Output load resistance

RL

RL Min.*2

Ω

Output load current

IOUT

20

mA

Oscillation frequency

fOSC

10

30

kHz

Extarnal resistance for

ROSC

680

2000

kΩ

oscillation

Capasitor for booster

C1, C2, C3

3.3

µF

Regulated output adjustable

RRV

100

1000

kΩ

resistance

*1: Recommended circuity in low voltage operation is

*2: RL Min. depends on input voltage as shown below.

shown below.

(VIN=-1.2V ~ -2.2V)

=C1=10µF	1	14
+
-	2	13		ROSC=
+	3	12		1MΩ	RL	CL
-	4	11
C2=10µF	5	10
	6	9
	7	8

+ -

C3=22µF

D1(VF(IF=1mA)) ≤ 0.6v

RL Min.(kΩ )

5
					VSTA2
4					VSTA1
3
2
1
					Triple

Double

0

0 1.5 2 3 4 5 6 VIN(V)

3