Panasonic AN8013SA User Manual

AN8017SA

Voltage Regulators

AN8017SA

1.8-volt 2-channel step-up DC-DC converter control IC

■ Overview

The AN8017SA is a two-channel PWM DC-DC converter control IC that features low-voltage operation.

This IC can obtain the step-up voltage with a small number of external components.

The minimum operating voltage is as low as 1.8 V so that it can operate with two dry batteries. In addition, since it uses the 16-pin surface mounting type package with 0.65 mm pitch, it is suitable for a miniaturized highly efficient potable power supply.

■ Features

•Wide operating supply voltage range (1.8 V to 14 V)

•Incorporating a high precision reference voltage circuit (allowance: ± 2%)

•Control in a wide output frequency range is possible (20 kHz to 1 MHz)

						Unit: mm
	5.0±0.2
	16		9
						(1.0)
			4.4±0.2	6.4±0.3	1005
					..
					00
					+−
					15	0° to 10°
					.
					0
						0.5±0.2
	1		8
			±0.2
			1.2
(0.225)	0.65		±0.1		Seating plane
	0.22	+0.10	0.1
		− 0.05
	SSOP016-P-0225A

•Built-in wideband error amplifier (single gain bandwidth: 10 MHz typical)

•A built-in timer latch short-circuit protection circuit (charge current: 1.1 µA typical)

•Incorporating an under-voltage lock-out circuit (U.V.L.O.) (circuit operation-starting voltage: 1.67 V typical)

•Dead-time is variable

•Flatness of switching current can be obtained by staggering the turn-on timing of each channel

•Built-in unlatch function

When DT1 pin is low level or DT2 pin is high level, independent turn-off is possible.

•Incorporating an on/off control function

(active-high control input, standby mode current: 1 µA maximum)

•Parallel operation is possible

•Totem pole output

•Output source-current: −50 mA maximum (Constant current output with a less supply voltage fluctuation is possible by connecting an external resistor to pin 6 and pin 11)

•Output sink-current: +80 mA maximun

■ Applications

• LCD displays, digital still cameras, and PDAs

1

AN8017SA

Voltage Regulators

■ Block Diagram

		CC	REF		OSC	DT1
		V	V
		9	16	1.19 V	1	5
	15					VREF
Off		On/off	Reference		Triangular wave		VCC
		control	voltage source		oscillation
							6	RB1
FB1	4		VREF			0.9 V
					0.2 V	PWM1
IN−1	3 Error amp.1				Unlatch1		7	Out1
					U.V.L.O.
		1.19 V			H
					L
					Latch		VCC
		0.9 V			R
					Q		11	RB2
FB2	13		S.C.P.		S
		Error	comp.		VREF
	14	amp.2	0.22 V			PWM2	10
IN+2								Out2
					0.9 V
		1.19 V			0.9 V	VREF
					Unlatch2		8	GND
				2		12
				S.C.P.		DT2

■ Pin Descriptions

Pin No.	Symbol	Description	Pin No.	Symbol	Description
1	OSC	Pin for connecting a oscillation timing	8	GND	Grounding pin
		resistor and capacitor
			9	VCC	Power supply voltage application pin
2	S.C.P.	Pin for connecting the time constant set-	10	Out2	Out2 block push-pull type output pin
		ting capacitor for short-circuit protection
			11	RB2	Out2 block output source current
					setting resistor connection pin
3	IN−1	Inverting input pin to error amplifier
		1 block
			12	DT2	PWM2 block dead-time setting pin
4	FB1	Output pin of error amplifier 1 block	13	FB2	Output pin of error amplifier 2 block
5	DT1	PWM1 block dead-time setting pin	14	IN+2	Error amplifier 2 block noninverting
					input pin
6	RB1	Out1 block output source current
		setting resistor connection pin
			15	Off	On/off control pin
7	Out1	Out1 block push-pull type output pin	16	VREF	Reference voltage output pin

2

Voltage Regulators			AN8017SA
■ Absolute Maximum Ratings
Parameter	Symbol	Rating	Unit
Supply voltage	VCC	15	V
Off terminal allowable application voltage	VOFF	15	V
IN−1 terminal allowable application voltage *2	V	6	V
	IN−1
IN+2 terminal allowable application voltage *2	V	6	V
	IN+2
Supply current	ICC		mA
Output source current	ISO(OUT)	−50	mA
Output sink current	ISI(OUT)	+80	mA
Power dissipation *1	PD	135	mW
Operating ambient temperature	Topr	−30 to +85	°C
Storage temperature	Tstg	−55 to +150	°C

Note) 1. Do not apply external currents or voltages to any pins not specifically mentioned.

For the circuit currents, '+' denotes current flowing into the IC, and '−' denotes current flowing out of the IC.

2.Except for the power dissipation, operating ambient temperature, and storage temperature, all ratings are for Ta = 25°C.

3.*1: Ta = 85 °C. For the independent IC without a heat sink. Note that applications must observe the derating curve for the relationship between the IC power consumption and the ambient temperature.

*2: VIN−1 , VIN+2 = VCC when VCC < 6 V.

■ Recommended Operating Range

Parameter	Symbol	Range	Unit
Supply voltage	VCC	1.8 to 14	V
Off control terminal application voltage	VOFF	0 to 14	V
Output source current	ISO(OUT)	−40 (minimum)	mA
Output sink current	ISI(OUT)	70 (maximum)	mA
Timing resistance	RT	1 to 51	kΩ
Timing capacitance	CT	100 to 10 000	pF
Oscillation frequency	fOUT	20 to 1 000	kHz
Short-circuit protection time constant	CSCP	1 000 (minimum)	pF
setting capacitance
Output current setting resistance	RB	180 to 15 000	Ω

■ Electrical Characteristics at VCC = 2.4 V, CREF = 0.1 F, Ta = 25°C

Parameter	Symbol	Conditions	Min	Typ	Max	Unit
Reference voltage block
Reference voltage	VREF	IREF = − 0.1 mA	1.166	1.19	1.214	V
Input regulation with input fluctuation	Line	VCC = 1.8 V to 14 V		15	30	mV
Load regulation	Load	IREF = − 0.1 mA to −1 mA	−20	−5		mV
U.V.L.O. block
Circuit operation start voltage	VUON		1.59	1.67	1.75	V

3

AN8017SA				Voltage Regulators
■ Electrical Characteristics at VCC = 2.4 V, CREF = 0.1 F, Ta = 25°C (continued)
Parameter	Symbol	Conditions		Min	Typ	Max	Unit
Error amplifier 1 block
Input threshold voltage 1	VTH1			1.16	1.19	1.22	V
Input bias current 1	IB1				0.2	0.8	µA
High-level output voltage 1	VEH1			0.83	0.93	1.03	V
Low-level output voltage 1	VEL1					0.2	V
Output source current 1	ISO(FB)1			−61	−47	−33	µA
Output sink current 1	ISI(FB)1			33	47	61	µA
Error amplifier 2 block
Input threshold voltage 2	VTH2			1.16	1.19	1.22	V
Input bias current 2	IB2				0.2	0.8	µA
High-level output voltage 2	VEH2			0.83	0.93	1.03	V
Low-level output voltage 2	VEL2					0.2	V
Output source current 2	ISO(FB)2			−61	−47	−33	µA
Output sink current 2	ISI(FB)2			33	47	61	µA
Oscillator block
Output off threshold voltage	VTH(OSC)			0.8	0.9	1.0	V
Output 1 block
Oscillation frequency 1	fOUT1	RT = 12 kΩ, CT = 330 pF		185	205	225	kHz
Output duty ratio 1	Du1			73	78	83	%
High-level output voltage 1	VOH1	IO = −10 mA, RB = 820 Ω		1.4			V
Low-level output voltage 1	VOL1	IO = 10 mA, RB = 820 Ω				0.2	V
Output source current 1	ISO(OUT)1	VO = 0.7 V, RB = 820 Ω		−40	−30	−20	mA
Output sink current 1	ISI(OUT)1	VO = 0.7 V, RB = 820 Ω		20			mA
Pull-down resistance 1	RO1			20	30	40	kΩ
Output 2 block
Oscillation frequency 2	fOUT2	RT = 12 kΩ, CT = 330 pF		185	205	225	kHz
Output duty ratio 2	Du2			72	77	82	%
High-level output voltage 2	VOH2	IO = −10 mA, RB = 820 Ω		1.4			V
Low-level output voltage 2	VOL2	IO = 10 mA, RB = 820 Ω				0.2	V
Output source current 2	ISO(OUT)2	VO = 0.7 V, RB = 820 Ω		−40	−30	−20	mA
Output sink current 2	ISI(OUT)2	VO = 0.7 V, RB = 820 Ω		20			mA
Pull-down resistance 2	RO2			20	30	40	kΩ
PWM1 block
Output full-off input threshold voltage 1	VT0-1	Duty = 0%			0.28	0.30	V
Output full-on input threshold voltage 1	VT100-1	Duty = 100%		0.65	0.72		V
Input current 1	IDT1	VDT1 = 0.5 V		−1.1	− 0.5		µA
4

Voltage Regulators					AN8017SA
■ Electrical Characteristics at VCC = 2.4 V, CREF = 0.1 F, Ta = 25 °C (continued)
Parameter	Symbol	Conditions	Min	Typ	Max	Unit
PWM2 block
Output full-off input threshold voltage 2	VT0-2	Duty = 0%	0.65	0.72		V
Output full-on input threshold voltage 2	VT100-2	Duty = 100%		0.28	0.30	V
Input current 2	IDT2	VDT2 = 0.2 V	−1.1	− 0.5		µA
Unlatch circuit 1 block
Input threshold voltage 1	VTHUL1		0.15	0.20	0.25	V
Unlatch circuit 2 block
Input threshold voltage 2	VTHUL2		0.8	0.9	1.0	V
Short-circuit protection circuit block
Input standby voltage	VSTBY			60	120	mV
Input threshold voltage 1	VTHPC1		0.8	0.9	1.0	V
Input threshold voltage 2	VTHPC2		0.17	0.22	0.27	V
Input latch voltage	VIN			60	120	mV
Charge current	ICHG	VSCP = 0 V	−1.43	−1.1	− 0.77	µA
On/off control block
Input threshold voltage	VON(TH)		0.8	1.0	1.3	V
Whole device
Output off consumption current	ICC(OFF)	RB = 820 Ω, duty = 0%		7.0	9.8	mA
Latch mode consumption current	ICC(LA)	RB = 820 Ω		5.6	7.8	mA
Standby current	ICC(SB)				1	µA

•Design reference data

Note) The characteristics listed below are theoretical values based on the IC design and are not guaranteed.

Parameter	Symbol	Conditions		Min	Typ	Max	Unit
Reference voltage block
VREF temperature characteristics	VREFdT	Ta = −30°C to +85°C		−1		+1	%
Over-current protection drive current	IOC				−11		mA
U.V.L.O. block
Reset voltage	VR				0.8		V
Error amplifier 1/2 blocks
VTH temperature characteristics	VTHdT	Ta = −30°C to +85°C		− 0.3		+ 0.3	mV/°C
Open-loop gain	AV				57		dB
Single gain bandwidth	fBW				10		MHz
Output 1/2 blocks
RB terminal voltage	VB				0.36		V
Frequency supply voltage characteristics	fdV			−1		+1	%
Frequency temperature characteristics	fdT			−3		+3	%
							5

AN8017SA

Voltage Regulators

■ Electrical Characteristics at VCC = 2.4 V, CREF = 0.1 F, Ta = 25°C (continued)

•Design reference data (continued)

Note) The characteristics listed below are theoretical values based on the IC design and are not guaranteed.

Parameter	Symbol	Conditions	Min	Typ	Max	Unit
Short-circuit protection block
Comparator threshold voltage	VTHL			1.19		V
On/off control block
Off terminal current	IOFF			23		µA

■ Terminal Equivalent Circuits

Pin No.

Equivalent circuit

Description

I/O

1

OSC:

O

VCC

The terminal used for connecting a timing capaci-

tor/resistor to set oscillation frequency.

Latch

Use a capacitance value within the range of 100 pF

to 10 000 pF and a resistance value within the range

S

of 1 kΩ to 51 kΩ. Use an oscillation frequency in the

Q

0.2 V

R

range of 20 kHz to 1 MHz. In a parallel synchronous

operation, the channel 2 output stops when this pin

1

becomes 0.9 V or more.

(Refer to the "Application Notes, [7]" section.)

2

VCC

S.C.P.:

O

The terminal for connecting a capacitor to set the

1.1 µA

Latch

time constant of the timer latch short-circuit protec-

tion circuit. Use a capacitance value in the range of

2 kΩ

S

1 000 pF or more. The charge current ICHG is 1.1 µA

Q

1.19 V

R

Output

typical.

cut-off

2

3

VCC

IN−1:

I

The inverting input pin for error amplifier 1 block.

3	Ω
100

1.19 V

6

Voltage Regulators

AN8017SA

■ Terminal Equivalent Circuits (continued)

Pin No.

Equivalent circuit

Description

I/O

4

VCC

FB1:

O

The output pin for error amplifier 1 block.

47

µA

The source current is −47 µA and the sink current is

OSC PWM

IN−1

47 µA.

Correct the frequency characteristics of the gain and

1.19 V

47 µA

the phase by connecting a resistor and a capacitor

4

between this terminal and GND.

5

VCC

DT1:

I

The pin for setting channel 1 output maximum duty

FB1 OSC PWM

ratio.

If this terminal is set at a voltage of 0.20 V or less,

FB1 terminal becomes low-level voltage and the

0.20 V

protective function for channel 1 output short-cir-

5

cuit will stop (Unlatch function).

6

VCC

RB1:

I

The pin for connecting a resistor for setting channel

1 output current.

Use a resistance value in the range of 180 Ω to 15 kΩ.

Out1

The terminal voltage is 0.36 V (at RB1 = 820 Ω).

120 Ω

30 kΩ

6

7

Out1:

O

VCC

The pin is push-pull type output terminal.

The absolute maximum ratings of output current are

RB1

−50 mA for the source current and +80 mA for the

ISO(OUT)1

sink current.

A constant current output with less fluctuation with

7

power supply voltage and dispersion can be ob-

30 kΩ

tained by the resistor externally attached to RB1

pin.

ISO(OUT)1 = 68 ×

VRB1

[A]

RB1

8

GND:

Grounding terminal

8

9

VCC:

9

The supply voltage application terminal

Use the operating supply voltage in the range of

1.8 V to 14 V.

7

AN8017SA

Voltage Regulators

■ Terminal Equivalent Circuits (continued)

Pin No.

Equivalent circuit

Description

I/O

10

Out2:

O

VCC

The pin is push-pull type output terminal.

The absolute maximum ratings of output current are

RB2

−50 mA for the source current and +80 mA for the

ISO(OUT)2

sink current.

A constant current output with less fluctuation with

10

power supply voltage and dispersion can be ob-

30 kΩ

tained by the resistor externally attached to RB2

pin.

ISO(OUT)2 = 68 ×

VRB2

[A]

RB2

11

VCC

RB2:

I

The pin for connecting a resistor for setting channel

2 output current.

Use a resistance value in the range of 180 Ω to 15

Out2

kΩ.

120 Ω

The terminal voltage is 0.36 V (at RB2 = 820 Ω).

30 kΩ

11

12

VCC

DT2:

I

The pin for setting channel 2 output maximum duty

0.9 V

ratio.

If this terminal is set at a voltage of 0.9 V or more,

FB2 OSC

PWM

FB2 terminal becomes high-level voltage and the

protective function for channel 2 output short-cir-

cuit will stop (Unlatch function).

0.9 V

12

13

VCC

FB2:

O

The output pin for error amplifier.

47

µA

The source current is −47 µA and the sink current is

IN+2

OSC PWM

47 µA.

Correct the frequency characteristics of the gain and

1.19 V

47 µA

the phase by connecting a resistor and a capacitor

13

between this terminal and GND.

14

VCC

IN+2:

I

The noninverting input pin for error amplifier 2

block.

14

100 Ω

1.19 V

8