Panasonic AN8014S Datasheet

Voltage regulators

0.3

(0° to 10°)

(0.15)

10.1±0.3

4.2±0.3

6.5±0.3

18

16 9

1.27

(0.605)

Seating plane Seating plane

0.40±0.25

0.1±0.1 1.5±0.2

AN8014S

Step-down, step-up, or inverting DC-DC converter control IC

■ Overview

The AN8014S is a single-channel PWM DC-DC

converter control IC.

This IC can provide any one output type from

among step-down, step-up and inverting output.

Allowing n-channel power MOSFET direct driv­ing, the AN8014S is ideal for high-efficiency power
supplies.

■ Features

• Wide operating supply voltage range (3.6 V to 34 V)

(The voltage is limited within a range between 3.6
V and 17 V if it is connected to a step-down volt­age circuit.)

•

Totem pole output circuit: output peak current (±1 A)

• On-chip pulse-by-pulse overcurrent detection and

protection circuit

Threshold voltage V

− 0.095 V typical

CC

• On-chip bootstrap circuit (allowing n-channel MOSFET direct driving.)

• On-chip under-voltage lock-out circuit (U.V.L.O.)

• On-chip on/off function (active-high control input, standby current of maximum 5 µA)

• On-chip timer latch short-circuit protection circuit

• Maximum oscillator frequency (500 kHz)

SOP016-P-0225A

Unit: mm

■ Applications

• DC-DC switching power supply

■ Block Diagram

16

OFF

5

S.C.P.

11

V

2.5V

On/off

active-high

R

U.V.L.O.

S

R

Latch

S

SGND

1

REF

V

REF

12

Q
Q

Q

PGND

DTC

4

Constant

current

source

1 µA 10 µA

S.C.P.
comp.

CT

3

2

Latch

RQS

PWM
comp.

RT

8

FB

Triangular
wave OSC

Error amp.

Boot
strap

10

CLM

15

V

CC

14

CB

13

Out

6

IN+

7

IN−

1

AN8014S Voltage regulators

■ Pin Descriptions

Pin No. Description

1 Internal reference output
2 Oscillator timing resistor connection
3 Oscillator timing capacitor connection
4 Dead-time control
5 Capacitance connection for short-circuit

protection delay
6 Error amplifier noninverting input
7 Error amplifier inverting input
8 Error amplifier output

■ Absolute Maximum Ratings

Parameter Symbol Rating Unit

Supply voltage V
Supply current I

2

Power dissipation
Operating ambient temperature
Storage temperature

*

1

*

1

*

On/off pin allowable application voltage V
Error amplifier allowable input voltage V
DTC pin allowable application voltage V
Out pin allowable application voltage V
Out pin constant output current I
Out pin peak output current I
CB pin allowable application voltage V
CB pin constant output current I
CB pin peak output current I
CLM pin allowable application voltage V

Note) 1.*1: Except for the operating ambient temperature and storage temperature, all ratings are for Ta = 25°C.

2: At Ta = 85°C

*

2. Do not apply external currents or voltages to any pins not specifically mentioned.

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

CC

CC

P

D

T

opr

T

stg

ON/OFF

I

DTC

OUT

O

O(Peak)

CB

CB

CBP

CLM

Pin No. Description

9 Not connected
10 Overcurrent protection input
11 Signal ground
12 Output stage ground
13 Totem pole type output
14 Bootstrap output
15 Supply voltage
16 On/off control

35 V
 mA

143 mW

−30 to +85 °C

−40 to +125 °C

V

CC

− 0.3 to V

− 0.3 to V

REF

REF

35 V

±100 mA

±1 000 mA

35 V

−100, 150 mA

−500, 1 000 mA

V

CC

V
V
V

V

■ Recommended Operating Range

Parameter Symbol Range Unit

Supply voltage V

2

CC

Step-up circuit system 3.6 to 34 V
Step-down circuit system 3.6 to 17

Voltage regulators AN8014S

■ Electrical Characteristics at V

= 12 V, Ta = 25°C

CC

Parameter Symbol Conditions Min Typ Max Unit

Reference voltage block

Output voltage V
Line regulation with input fluctuation

REFIREF

Line VCC = 3.6 V to 34 V  16 25 mV

Load regulation Load I

U.V.L.O. block

Circuit operation start voltage V
Hysteresis width V

UON

HYS

Error amplifier block

Input offset voltage V
Input bias current I
Common-mode input voltage range V
High-level output voltage V

Low-level output voltage V

IO

B

ICR

EH

EL

Dead-time control circuit block

Input current I
Low-level input threshold voltage V
High-level input threshold voltage V

DTC

DT-L

DT-H

Output block

Oscillator frequency f

OUT

Output duty Du R
Low-level output voltage V
High-level output voltage V

OLIO

OHIO

Bootstrap circuit block

Input standby voltage V

INCBICB

Short-circuit protection circuit block

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

THPC

STBY

IN

CHG

On/off control block

Threshold voltage V

TH

Overcurrent protection block

Threshold voltage V

CLM

= −1 mA 2.522 2.6 2.678 V

= − 0.1 mA to −1 mA  110mV

REF

 2.8 3.1 3.4 V
 60 140 180 mV

−6  6mV
−500 −25  nA
− 0.1  0.8 V
 V

REFVREF

 V

− 0.3 − 0.1

0.1 0.3 V

−15.8 −13.2 −10.6 µA

Duty 0%  0.45 0.65 V
Duty 100% 1.2 1.4  V

CT = 120 pF, RT = 15 kΩ 196 218 240 kHz

= 75 kΩ 47 52 57 %

DTC

= 70 mA  1.0 1.3 V
= −70 mA V

CB

V

CB

 V

−2.0 −1.0

= −70 mA V

CC

V

CCVCC

V

−1.2 −1.0 − 0.8

 0.70 0.75 0.80 V
30 120 mV
30 120 mV
−2.76 −2.30 −1.84 µA

 0.8  2.0 V

 V

CC

V

CCVCC

V

− 0.115− 0.095− 0.075

3

AN8014S Voltage regulators

■ Electrical Characteristics at V

= 12 V, Ta = 25°C (continued)

CC

Parameter Symbol Conditions Min Typ Max Unit

Whole device

Total consumption current I
Standby current I

CC

CC(SB)

5.0 7.0 mA
5 µA

• Design reference data

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

Parameter Symbol Conditions Limit Unit

Reference voltage block

Output voltage temperature V

Ta = −30°C to +25°C ±1%

TC1

characteristics 1
Output voltage temperature V

Ta = 25°C to 85°C ±1%

TC2

characteristics 2
Output short-circuit current I

OS

−40 mA

Error amplifier block

Output sink current I
Output source current I

SOURCEVFB

Open-loop gain A

SINKVFB

G

= 0.9 V 8 mA
= 0.9 V −110 µA

 70 dB

Output block

f

Frequency supply voltage f

dV

= 200 kHz, ±3%

OUT

characteristics VCC = 3.6 V to 34 V
Frequency temperature f

dT1

f

= 200 kHz, ±9%

OUT

characteristics 1 Ta = −30°C to +25°C

f

Frequency temperature f

dT2

= 200 kHz, ±9%

OUT

characteristics 2 Ta = 25°C to 85°C

Oscillator block

RT pin voltage V

RT

 0.4 V

Short-circuit protection circuit block

Comparator threshold voltage V

THL

 1.87 V

Overcurrent protection circuit block

Delay time t

DLY

 200 ns

4

Voltage regulators AN8014S

■ Terminal Equivalent Circuits

Pin No. I / O Equivalent circuit Description

1O V

V

CC

REF

:

Outputs the reference voltage

Incorporating short-circuit protection
against ground.

V

REF

1

2  RT:

V

REF

Connection for the timing resistor which
decides the oscillator frequency. Use a re­sistor in the range 5.1 kΩ to 30 kΩ. The
pin voltage is approx. 0.4 V.

DTC S.C.P.

100 Ω

RT(≈ 0.4 V)

2

3  CT:

V

REF

To PWM input

Connection for the timing capacitor which
decides the oscillator frequency. Use a ca-

I

O

pacitor in the range 100 pF to 10 000 pF.

CT

OSC
comp.

For the oscillator frequency setting, refer

3

to the "Application Notes, [1] Function
descriptions" section. Use an oscillator fre-

2I

O

quency in the range 5 kHz to 500 kHz.

2.6 V (allowance: 3%)

4  DTC:

V

REF

PWM comparator

input

Connection for a resistor and a capacitor
that set the dead-time and soft start period
of PWM output.
Input current I

I

4

R

DTC

DTC

DTC

C

DTC

2

resistor R
variations and temperature variations.
It is approx. −13.2 µA when RT = 15 kΩ.

I

DTC

RT

is decided by the timing

DTC

which controls sample to sample

T

× 1

V

RT

=

RT2

[A]

5

AN8014S Voltage regulators

■ Terminal Equivalent Circuits (continued)

Pin No. I / O Equivalent circuit Description

5  S.C.P.:

V

REF

I

CHG

Latch

S

Q

U.V.L.O.

output

6I IN+:

V

REF

5

0.75 V

S.C.P.

R

Connection for the capacitor that sets the
soft start period and the timer latch short­circuit protection circuit time constant.
Use a capacitor with a value of 1 000 pF
or higher.
The charge current I
timing resistor R

is decided by the

CHG

which controls sample

T

to sample variations and temperature varia­tions.
It is approx. −2.3 µA when R

VRT × 1

I

CHG

=

RT11

[A]

= 15 kΩ.

T

Noninverting input to the error amplifier.
Use the common-mode input in the range

− 0.1 V to +0.8 V.

7I IN−:

Inverting input to the error amplifier.
Use the common-mode input in the range

− 0.1 V to +0.8 V.

7 6

IN− IN+

8 O FB:

V

REF

Source current

8

FB

Output from the error amplifier.
The source current is approx. −110 µA and
sink current is approx. 8 mA.
Correct the frequency characteristics of

Sink current

the gain and the phase by connecting a re­sistor and a capacitor between this pin
and IN− pin.

9 N.C.: Not connected.

10 I CLM:

V

CC

0.1 V

10

CLM

Detects the overcurrent state in switching
transistor.
Insert a resistor with a low resistance between
this pin and VCC to detect overcurrent states.

CLM
comp.

When this pin falls to a level 95 mV or
more lower than V
turned off for that period thus narrowing

50 µA 50 µA

the width of the on-period.
(This implements a pulse-by-pulse
overcurrent protection technique.)

, the PWM output is

CC

6