Panasonic AN8018SA Datasheet

Voltage Regulators

AN8018SA

1.8-volt 2-channel step-up, step-down,
or inverting DC-DC converter control IC

■ Overview

The AN8018SA is a two-channel PWM DC-DC con-

verter control IC that features low-voltage operation.

This IC can obtain the step-up, step-down and invert-

ing voltages 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 miniaturized highly
efficient potable power supply.

5.0±0.2

16

18

9

4.4±0.2

6.4±0.3

1.2±0.20.1±0.1

−0.05

+0.10

5
.1

0

Unit: mm

(1.0)

0° to 10°

0.5±0.2

■ Features

(0.225)

0.65

0.22

+0.10

− 0.05

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

• Incorporating a high precision reference voltage circuit

(allowance: ± 2%)

SSOP016-P-0225A

• Control in a wide output frequency range is possible

(20 kHz to 1 MHz).

• Built-in wideband error amplifier (single gain bandwidth

10 MHz typical)

• Built-in timer latch short-circuit protection circuit
(charge current 1.1 µA typical)

• Incorporating the 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 a on/off control function

(active-high control input, standby mode current: 5 µA maximum)

• Parallel operation is possible.

• Output block

• Totem pole 1 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 11)

• Output sink-current: +80 mA maximum

• Open-collector 1 output

• Output current: 50 mA maximum

Seating plane

■ Applications

• LCD displays, digital still cameras, and PDAs

1

AN8018SA Voltage Regulators

■ Block Diagram

On/

off

FB1

IN−1
IN+1

FB2

IN+2

15

On/off
control

5

Error amp. 1

4
3

0.9 V

13

Error amp. 2

14

1.19 V

CC

V

9

REF

V

16

Reference

voltage source

V

REF

1.19 V

OSC

1

Triangular wave
oscillation

0.2 V

DT1

6

V

REF

0.9 V
7

PWM1

Out1

Unlatch1

U.V.L.O.

H
L

Latch

V

CC

11

RB2

10

Out2

8

GND

0.22 V

S.C.P.
comp.

R

Q

S

V

REF

PWM2

0.9 V

0.9 V
V

REF

Unlatch2

2

12

S.C.P.

■ Pin Descriptions

Pin No. Symbol Description

1 OSC Pin for oscillation timing resistor

and capacitor connection

2 S.C.P.

3IN+1 Error amplifier 1 block noninverting

4IN−1
5 FB1 Output pin of error amplifier 1 block
6 DT1 PWM1 block dead-time setting pin

7 Out1 Out1 block open-collector type

Pin for connecting the time constant set­ting capacitor for short-circuit protection

input pin
Error amplifier 1 block inverting input pin

output pin

DT2

Pin No. Symbol Description

8 GND Grounding pin
9VCCPower supply voltage application pin

10 Out2 Out2 block push-pull type output pin
11 RB2 Out2 block output source current

setting resistor connection pin
12 DT2 PWM2 block dead-time setting pin
13 FB2 Output pin of error amplifier 2 block
14 IN+2 Error amplifier 2 block inverting input

pin
15 Off On/off control pin

16 V

Reference voltage output pin

REF

2

Voltage Regulators AN8018SA

■ Absolute Maximum Ratings

Parameter Symbol Rating Unit

Supply voltage V
Off terminal allowable application voltage V
IN+1 terminal allowable application voltage
IN−1 terminal allowable application voltage
IN+2 terminal allowable application voltage
Out1 terminal allowable application voltage V
Supply current I
Out1 terminal output current I
Out2 terminal source current I
Out2 terminal sink current I

1

Power dissipation

*

Operating ambient temperature T
Storage temperature T

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: V

, V

, V

*

IN−1

IN-1

= VCC when VCC < 6 V.

IN+2

CC

OFF

2

*

V

IN−1

2

*

V

IN−1

2

*

V

IN+2

OUT

CC

O

SO(OUT)

SI(OUT)

P

D

opr

stg

15 V
15 V

6V
6V
6V

15 V

 mA

+50 mA

−50 mA
+80 mA

135 mW

−30 to +85 °C

−55 to +150 °C

■ Recommended Operating Range

Parameter Symbol Range Unit

Supply voltage V
Off control terminal application voltage V
Output source current I
Output sink current I
Timing resistance R
Timing capacitance C
Oscillation frequency f
Short-circuit protection time constant C

CC

OFF

SO(OUT)

SI(OUT)

T

T

OUT

SCP

setting capacitance
Output current setting resistance R

■ Electrical Characteristics at VCC = 2.4 V, C

B

= 0.1 µF, Ta = 25°C

REF

Parameter Symbol Conditions Min Typ Max Unit

Reference voltage block

Reference voltage V

REFIREF

= − 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 I

= − 0.1 mA to −1 mA −20 −5  mV

REF

1.8 to 14 V
0 to 14 V

−40 (minimum) mA

70 (maximum) mA

1 to 51 kΩ

100 to 10 000 pF

20 to 1 000 kHz

1 000 (minimum) pF

180 to 15 000 Ω

3

AN8018SA Voltage Regulators

■ Electrical Characteristics at VCC = 2.4 V, C

Parameter Symbol Conditions Min Typ Max Unit

U.V.L.O. block

Circuit operation start voltage V

Error amplifier 1 block

Input offset voltage V
Common-mode input voltage range V
Input bias current 1 I
High-level output voltage 1 V
Low-level output voltage 1 V
Output source current 1 I
Output sink current 1 I

Error amplifier 2 block

Input threshold voltage V
Input bias current 2 I
High-level output voltage 2 V
Low-level output voltage 2 V
Output source current 2 I
Output sink current 2 I

Oscillator block

Output off threshold voltage V

Output 1 block

Oscillation frequency 1 f
Output duty ratio 1 Du
Output saturation voltage V
Output leak current I

Output 2 block

Oscillation frequency 2 f
Output duty ratio 2 Du
High-level output voltage V
Low-level output voltage V
Output source current I
Output sink current I
Pull-down resistance R

PWM1 block

Output full-off input threshold V
voltage 1

Output full-on input threshold V
voltage 1

Input current 1 I

UON

IO

ICR

B1

EH1

EL1

SO(FB)1

SI(FB)1

TH

B2

EH2

EL2

SO(FB)2

SI(FB)2

TH(OSC)

OUT1RT

1

O(SAT)IO

VCC = 14 V  1 µA

OLE

OUT2RT

2

OHIO

OLIO

SO(OUT)VO

SI(OUT)VO

O

Duty = 0%  0.28 0.30 V

T0-1

Duty = 100% 0.65 0.72  V

T100-1

V

DT1

= 0.1 µF, Ta = 25°C (continued)

REF

1.59 1.67 1.75 V

−6 +6mV

0.3  0.7 V

− 0.6 − 0.2 µA

0.83 0.93 1.03 V

0.2 V

−61 −47 −33 µA

33 47 61 µA

1.16 1.19 1.22 V

 0.2 0.8 µA

0.83 0.93 1.03 V

0.2 V

−61 −47 −33 µA

33 47 61 µA

0.8 0.9 1.0 V

= 12 kΩ, CT = 330 pF 185 205 225 kHz

75 80 85 %

= 30 mA 0.5 V

= 12 kΩ, CT = 330 pF 185 205 225 kHz

72 77 82 %

= −10 mA, RB = 820 Ω 1.4  V
= 10 mA, RB = 820 Ω0.2 V

= 0.7 V, RB = 820 Ω−40 −30 −20 mA
= 0.7 V, RB = 820 Ω 20 mA

20 30 40 kΩ

= 0.4 V −1.1 − 0.5 µA

DT1

4

Voltage Regulators AN8018SA

■ Electrical Characteristics at VCC = 2.4 V, C

Parameter Symbol Conditions Min Typ Max Unit

PWM2 block

Output full-off input threshold V
voltage 2

Output full-on input threshold V
voltage 2

Input current 2 I

Unlatch circuit 1 block

Input threshold voltage 1 V
Unlatch circuit 2 block
Input threshold voltage 2 V

Short-circuit protection circuit block

Input standby voltage V
Input threshold voltage 1 V
Input threshold voltage 2 V
Input latch voltage V
Charge current I

On/off control block

Input threshold voltage V

ON(TH)

Whole device

Output off consumption current I
Latch mode consumption current I
Standby current I

CC(OFF)RB

CC(LA)RB

CC(SB)

Duty = 0% 0.65 0.72  V

T0-2

Duty = 100%  0.28 0.30 V

T100-2

V

DT2

THUL1

THUL2

STBY

THPC1

THPC2

CHG

DT2

IN

V

SCP

= 0.1 µF, Ta = 25°C (continued)

REF

= 0 V −1.1 − 0.5 µA

0.15 0.20 0.25 V

0.8 0.9 1.0 V

 60 120 mV

0.8 0.9 1.0 V

0.17 0.22 0.27 V

 60 120 mV

= 0 V −1.43 −1.1 − 0.77 µA

0.8 1.0 1.3 V

= 820 Ω, duty = 0%  5.7 8.0 mA
= 820 Ω5.6 7.8 mA

 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

V

temperature characteristics V

REF

Over-current protection drive current I

REFdTTa

OC

= −30°C to +85°C −1 +1%

−11  mA

U.V.L.O. block

Reset voltage V

R

 0.8  V

Error amplifier 1/2 blocks

VTH temperature characteristics V
Open-loop gain A
Single gain bandwidth f

THdTTa

V

BW

= −30°C to +85°C − 0.3 + 0.3 mV/°C

 57  dB
 10  MHz

Output 1/2 blocks

Frequency supply voltage f

dV

−1 +1%

characteristics
Frequency temperature characteristics f

dT

−3 +3%

5

AN8018SA Voltage Regulators

■ Electrical Characteristics at VCC = 2.4 V, C

•

Design reference data (continued)

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

= 0.1 µF, Ta = 25°C (continued)

REF

Parameter Symbol Conditions Min Typ Max Unit

Output 2 block

RB terminal voltage V

B

 0.36  V

Short-circuit protection block

Comparator threshold voltage V

THL

 1.19  V

On/off control block

Off terminal current I

OFF

 23 µA

■ Terminal Equivalent Circuits

Pin No. Equivalent circuit Description I/O

1 OSC: O

V

CC

Latch

S

Q

R

0.2 V

1

2 S.C.P.: O

2 kΩ

V

1.1 µA

1.19 V

CC

Latch

S
R

Q

Output

cut-off

2

The terminal used for connecting a timing capaci­tor/resistor to set oscillation frequency.
Use a capacitance value within the range of 100 pF
to 10 000 pF and a resistance value within the range
of 3 kΩ to 30 kΩ. Use an oscillation frequency in the
range of 20 kHz to 1 MHz. When operating the
circuit in parallel and synchronously, the channel 2
output stops when this pin becomes 0.9 V or more.
(Refer to the "Application Notes, [7]" section.)

The terminal for connecting a capacitor to set the
time constant of the timer latch short-circuit pro­tection circuit. Use a capacitance value in the range
of 1 000 pF or more. The charge current I

CHG

is

1.1 µA typical.

3IN+1: I

V

CC

The noninverting input pin for error amplifier 1
block.

4IN−1: I

4 3

100 Ω 100 Ω

The inverting input pin for error amplifier 1 block.

5 FB1: O

IN+1
IN−1

47 µA

OSC PWM

47 µA

5

The output pin for error amplifier 1 block.
The source current is −47 µA and the sink current
is 47 µA.
Correct the frequency characteristics of the gain
and the phase by connecting a resistor and a capa­citor between this terminal and GND.

6

Voltage Regulators AN8018SA

■ Terminal Equivalent Circuits (continued)

Pin No. Equivalent circuit Description I/O

6 DT1: I

7 Out1: O

8 GND: 

V

0.2 V

CC

FB1

8

OSC PWM

6

V

CC

7

The pin for setting channel 1 output maximum
duty ratio.
If this terminal is set at a voltage of 0.20 V or less,
FB1 terminal becomes low-level voltage and the
protective function for channel 1 output short­circuit will stop (Unlatch function).

The pin is open-collector type output terminal.
The absolute maximum rating of output current is
+50 mA.

Grounding terminal

9V

9

: 

CC

The supply voltage application terminal
Use the operating supply voltage in the range of

1.8 V to 14 V.

10 Out2: O

V

CC

RB2

The pin is push-pull type output terminal.
The absolute maximum rating of output source
current is −50 mA.

I

SO(OUT)

30 kΩ

10

The absolute maximum rating of output sink cur­rent is +80 mA.
A constant current output with less fluctuation
with power supply voltage and dispersion can be
obtained by the resistor externally attached to RB2
pin.

V

I

11 RB2: I

V

CC

The pin for connecting a resistor for setting chan-

SO(OUT)2

= 68 ×

RB2

[A]

R

B2

nel 2 output current.
Use a resistance value in the range of 180 Ω to 1.1
kΩ.

Out2

The terminal voltage is 0.36 V (at R

= 820 Ω).

B2

120 Ω

11

7

AN8018SA Voltage Regulators

■ Terminal Equivalent Circuits (continued)

Pin No. Equivalent circuit Description I/O

12 DT2: I

V

FB2

0.9 V

CC

0.9 V

OSC PWM

12

The pin for setting channel 2 output maximum
duty ratio.
If this terminal is set at a voltage of 0.9 V or more,
FB2 terminal becomes high-level voltage and the
protective function for channel 2 output short­circuit will stop (Unlatch function).

13 FB2: O

V

IN+2

CC

47 µA

OSC PWM

The output pin for error amplifier 2 block.
The source current is −47 µA and the sink current
is 47 µA.
Correct the frequency characteristics of the gain

1.19 V

47 µA

13

14 IN+2: I

V

CC

and the phase by connecting a resistor and a ca­pacitor between this terminal and GND.

The noninverting input pin for error amplifier 2
block.

14

100 Ω

1.19 V

15 Off: I

The terminal for on/off control.
High-level input: Normal operation (V
V)
Low-level input: Standby state (V

< 0.8 V)

OFF

OFF

> 1.3

15

30 kΩ

60 kΩ

Internal circuit
start/stop

The total current consumption in the standby state
can be suppressed to a value 1 mA or less.

16 V

V

CC

:O

REF

The output terminal for the internal reference
voltage.
The reference voltage is 1.19 V (allowance: ± 2 %) at

16

= 2.4 V and I

CC

= − 0.1 mA.

REF

V
Connect a capacitor of 0.01 µF or more between
V

and GND for phase compensation.

REF

8