Panasonic AN8049SH Datasheet

Voltage Regulators

AN8049SH

1.8-volt 3-channel step-up, step-down, and polarity inverting DC-DC converter control IC

■ Overview

The AN8049SH is a three-channel PWM DC-DC converter control IC that features low-voltage operation. This IC can form a power supply that provides two stepup outputs and one step-down or polarity inverted output with a minimal number of external components. The AN8049SH features the ability to operate from a supply voltage as low as 1.8 V, and thus can be operated from two dry-batteries.

6.5±0.3

24 13

+0.10

5.5±0.3

7.5±0.3

(0.50)

112

0.65±0.100.65±0.10

1.5±0.20.1±0.1

– 0.05

0.15

Unit : mm

0° to 10°

■ Features

(0.50)

0.50

Seating plane

0.2±0.1

• Wide operating supply voltage range: 1.8 V to 14 V

• High-precision reference voltage circuit

—V

REF

pin voltage: ±1%

SSOP024-P-0300A

— Error amplifier: ±1.5%

• Surface mounting package for miniaturized and thinner power supplies

Package: SSOP-24D

0.5-mm lead pitch

7.8 mm × 6.8 mm × t 1.9 mm

• Supports control over a wide output frequency range: 20 kHz to 1 MHz

• On/off (sequence control) pins provided for each channel for easy sequence control setup

• The negative supply error amplifier supports 0-volt input.

Common-mode input voltage range: − 0.1 V to V

−1.4 V

This allows the number of external components to be reduced by two resistors.

• Fixed duty factor: 86%

However, the duty can be adjusted to anywhere from 0% to 100% with an external resistor.

• Timer latch short-circuit protection circuit (charge current: 1.1 µA typical)

• Low input voltage malfunction prevention circuit (U.V.L.O.) (operation start voltage: 1.67 V typical)

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

• Alternate package versions also available.

Part No.: AN8049FHN Package: QFN-24

0.5-mm lead pitch

5.4 mm × 4.4 mm × t 0.8 mm

Seating plane

■ Applications

• Electronic equipment that requires a power supply system

AN8049SH Voltage Regulators

■ Block Diagram

S.C.P.

FB3

IN+3 IN−3

DT3

CTL3

IN-123FB124CTL1

Error amplifier 1

1.26 V

Error amplifier 2

S.C.P. comp.

Error amplifier 3

1.26 V

1.1 µA

0.9 V

REF

20 kΩ

1.1 µA

44 kΩ56 kΩ

20 kΩ

Reference voltage

supply

1.26 V

U.V.L.O.

1.26 V

1.1 µA

20 kΩ

REF

(Allowance: ±1%)

Latch

1.26 V

REF

1.26 V

DT1

45 kΩ

55 kΩ

OSC

Sawtooth wave generator

0.7 V

0.3 V

PWM1

PWM3

PWM2

REF

45 kΩ 55 kΩ

Off

On/off control

RB1

OUT1

27 kΩ

OUT3

RB2

OUT2

27 kΩ

GND

IN−2

FB2

■ Pin Descriptions

Pin No. Symbol Description

1 S.C.P. Connection for the capacitor

2 DT3 Channel 3 soft start setting 3 DT2 Channel 2 soft start setting 4 DT1 Channel 1 soft start setting 5 CTL3 Channel 3 on/off control 6 CTL2 Channel 2 on/off control 7 CTL1 Channel 1 on/off control 8 Off On/off control 9V

10 RB2 Connection for the OUT2

11 RB1 Connection for the OUT1

that provides the shortcircuit protection circuit time constant

Reference voltage output

REF

block output source current setting resistor

CTL2

DT2

Pin No. Symbol Description

12 OUT1 OUT1 block push-pull output 13 OUT2 OUT2 block push-pull output

14 GND Ground 15 OUT3 OUT3 block open-collector output

16 V

Supply voltage

17 OSC Oscillator circuit timing resistor and

capacitor connection

18 IN+3 Error amplifier 3 noninverting input 19 IN−3 Error amplifier 3 inverting input 20 FB3 Error amplifier 3 output 21 IN−2 Error amplifier 2 inverting input 22 FB2 Error amplifier 2 output 23 IN−1 Error amplifier 1 inverting input 24 FB1 Error amplifier 1 output

Voltage Regulators AN8049SH

■ Absolute Maximum Ratings

Parameter Symbol Rating Unit

Supply voltage V Off pin allowable application V

OFF

voltage CTL pin allowable application V

CTL

voltage Error amplifier input pin V

allowable application voltage

Supply current I OUT1 and OUT2 pin output I

SO(OUT)

source current OUT3 pin output current I

Power dissipation

Operating temperature T Storage temperature T

Note) 1. 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.

2. Items other than the storage temperature, operating temperature, and power dissipation are all stipulated for an ambient temperature Ta = 25°C.

3.*1: Ta = 85°C. See the "Application Notes" for details on the relationship between IC power dissipation and the ambient

temperature.

2: When VCC < 6 V, the following condition must hold: V

opr

stg

14.2 V

VCC − 0.2 V

 mA

−50 mA

+50 mA

146 mW

−30 to +85 °C

−55 to +125 °C

= V

IN−1

= VCC − 0.2 V.

IN−2

■ Recommended Operating Range

Parameter Symbol Range Unit

Off pin application voltage V OUT1 and OUT2 pin output source current I OUT3 pin output current I Timing resistance R Timing capacitance C Oscillator frequency f Short-circuit protection time-constant setting capacitance C Output current setting resistance R

OFF

SO(OUT)

OUT

SCP

0 to 14 V

−40 to −1mA 40 (max.)

3 to 33 kΩ

100 to 10 000 pF

20 to 1 000 kHz

1 000 (min.) pF

750 to 15 000 Ω

AN8049SH Voltage Regulators

■ Electrical Characteristics at V

= 2.4 V, C

Parameter Symbol Conditions Min Typ Max Unit

Reference voltage block

Reference voltage V Line regulation with input fluctuation

REFIREF

Line V

Load regulation Load I

U.V.L.O. block

Circuit operation start voltage V

UON

Error amplifier 1 block

Input threshold voltage 1 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

TH1

EH1

EL1

SO(FB)1

SI(FB)1

Error amplifier 2 block

Input threshold voltage 2 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

TH2

EH2

EL2

SO(FB)2

SI(FB)2

Error amplifier 3 block

Input offset voltage V Common-mode input voltage range V

Input bias current 3 I High-level output voltage 3 V Low-level output voltage 3 V Output source current 3 I Output sink current 3 I

ICR

EH3

EL3

SO(FB)3

SI(FB)3

Oscillator block

Oscillator frequency f

OUT

= 0.1 µF, Ta = 25°C

REF

= − 0.1 mA 1.247 1.26 1.273 V

= 1.8 V to 14 V  220mV

= − 0.1 mA to −1 mA −20 −3  mV

REF

1.59 1.67 1.75 V

1.241 1.26 1.279 V

 0.1 0.2 µA

1.0 1.2 1.4 V

0.2 V

−38 −31 −24 µA

0.5 mA

1.241 1.26 1.279 V

 0.1 0.2 µA

1.0 1.2 1.4 V

0.2 V

−38 −31 −24 µA

0.5 mA

−6  6mV

− 0.1  V

−1.4

− 0.6 − 0.3 µA

1.0 1.2 1.4 V

0.2 V

−38 −31 −24 µA

0.5 mA

RT = 7.5 kΩ, CT = 680 pF 170 190 210 kHz

Voltage Regulators AN8049SH

■ Electrical Characteristics at V

Parameter Symbol Conditions Min Typ Max Unit

Output 1 block

Output duty factor 1 Du High-level output voltage 1 V Low-level output voltage 1 V Output source current 1 I Output sink current 3 I Pull-down resistor 1 R

Output 2 block

Output duty factor 2 Du High-level output voltage 2 V Low-level output voltage 2 V Output source current 2 I Output sink current 2 I Pull-down resistor 2 R

Output 3 block

Output duty factor 3 Du Output saturation voltage V Output leakage current I

Short-circuit protection circuit block

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

On/off control block

Input threshold voltage V

CTL block

Input threshold voltage V Charge current I Whole Device Average consumption current I

Standby mode current I

= 2.4 V, C

RT = 7.5 kΩ, CT = 680 pF 80 86 92 %

OH1IO

OL1IO

SO(OUT)1VO

SI(OUT)1VO

RT = 7.5 kΩ, CT = 680 pF 80 86 92 %

OH2IO

OL2IO

SO(OUT)2VO

SI(OUT)2VO

RT = 7.5 kΩ, CT = 680 pF 80 86 92 %

O(SAT)IO

V13 = 14 V  1 µA

OLE

STBY

THPC

CHG

ON(TH)

THCTL

CTL

CC(OFF)RB

CC(SB)

= 0.1 µF, Ta = 25°C (continued)

REF

= −10 mA, RB = 1 kΩ VCC −1  V = 10 mA, RB = 1 kΩ0.2 V

= 0.7 V, RB = 1 kΩ−34 −29 −24 mA = 0.7 V, RB = 1 kΩ 40 mA

17 27 37 kΩ

= −10 mA, RB = 1 kΩ VCC −1  V = 10 mA, RB = 1 kΩ0.2 V

= 0.7 V, RB = 1 kΩ−34 −29 −24 mA = 0.7 V, RB = 1 kΩ 40 mA

17 27 37 kΩ

= 40 mA 0.5 V

0.1 V

0.8 0.9 1.0 V

0.1 V

= 0 V −1.43 −1.1 − 0.77 µA

SCP

0.6 0.9 1.2 V

1.07 1.26 1.45 V

= 0 V −1.43 −1.1 − 0.77 µA

CTL

= 9.1 kΩ, duty = 50%  4.2 5.5 mA

 1 µA

AN8049SH Voltage Regulators

■ Electrical Characteristics at Ta = 25°C (continued)

•

Design reference data

Note: The characteristics listed below are reference values related to the IC design and are not guaranteed.

Parameter Symbol Conditions Min Typ Max Unit

Reference voltage block

temperature characteristics V

REF

RFEdTTa

Error amplifier 1 block

VTH temperature characteristics V Open loop gain 1 A

THdT1Ta

Error amplifier 2 block

VTH temperature variation V Open loop gain 2 A

THdT2

Error amplifier 3 block

Open loop gain 3 A

Oscillator block

Frequency supply voltage f

characteristics RT = 7.5 kΩ, CT = 680 pF Frequency temperature f

characteristics RT = 7.5 kΩ, CT = 680 pF

Short-circuit protection circuit block

Comparator threshold voltage V

THL

On/off control block

Off pin current I

OFF

= −30°C to +85°C  1  %

= −30°C to +85°C  1.5  %

 80  dB

 1.5  %  80  dB

 80  dB

VCC = 1.8 V to 14 V  1  %

Ta = −30°C to +85°C  3 %

 1.26  V

= 5 V  38 µA

OFF

Voltage Regulators AN8049SH

■ Terminal Equivalent Circuits

Pin No. Equivalent circuit Description I/O

1 S.C.P.: O

2 DT3: I

3 DT2: I

4 DT1: I

1.5 kΩ

1.1 µA

44 kΩ

46 kΩ

45 kΩ

55 kΩ

45 kΩ

55 kΩ

1.26 V

Latch

S R

20 17

22 17

24 17

Output shutoff

PWM3

PWM2

PWM1

Connection for the capacitor that sets the timer latch short-circuit protection circuit time constant. Use a capacitor with a value of 1 000 pF or higher. The charge current I

is 1.1 µA

CHG

typical.

Sets the channel 3 soft start time. Set the time by connecting a capacitor between this pin and ground. (See the "Application Notes, [7]" section.) Note that although the channel 3 maximum on duty is set internally to 86%, the maximum on duty can be adjusted by connecting resistors between this pin and ground, and between this pin and the V

pin. (See the "Application

REF

Notes, [6]" section.)

Sets the channel 2 soft start time. Set the time by connecting a capacitor between this pin and ground. (See the "Application Notes, [7]" section.) Note that although the channel 2 maximum on duty is set internally to 86%, the maximum on duty can be adjusted by connecting resistors between this pin and ground, and between this pin and the V

REF

pin.

(See the "Application Notes, [6]" section.)

Sets the channel 1 soft start time. Set the time by connecting a capacitor between this pin and ground. (See the "Application Notes, [7]" section.) Note that although the channel 1 maximum on duty is set internally to 86%, the maximum on duty can be adjusted by connecting resistors between this pin and ground, and between this pin and the V

REF

pin.

(See the "Application Notes, [6]" section.)

AN8049SH Voltage Regulators

■ Terminal Equivalent Circuits (continued)

Pin No. Equivalent circuit Description I/O

5 CTL3: I

Controls the on/off state of channel 3. A delay can be provided in the power supply

20 kΩ

1.1 µA

High Channel 3

1.26 V

output operation

6 CTL2: I

20 kΩ

1.1 µA

High Channel 2

1.26 V

output operation

7 CTL1: I

20 kΩ

1.1 µA

High Channel 1

1.26 V

output operation

turn-on start time by connecting a capacitor between this pin and ground. (See the "Application Notes, [9]" section.) t

= 1.26 (V) × C

DLY3

(µF)/1.1 (µA) (s)

CTL3

This pin can also be used to control the on/off state with an external signal. In that case, the allowable input voltage range is from 0 V to V

. Note that during

U.V.L.O. and timer latch operation, this pin is connected to ground through a 20 kΩ resistor.

Controls the on/off state of channel 2. A delay can be provided in the power supply turn-on start time by connecting a capacitor between this pin and ground. (See the "Application Notes, [9]" section.) t

= 1.26 (V) × C

DLY2

(µF)/1.1 (µA) (s)

CTL2

This pin can also be used to control the on/off state with an external signal. In that case, the allowable input voltage range is from 0 V to V

. Note that

during U.V.L.O. and timer latch operation, this pin is connected to ground through a 20 kΩ resistor.

Controls the on/off state of channel 1. A delay can be provided in the power supply turn-on start time by connecting a capacitor between this pin and ground. (See the "Application Notes, [9]" section.) t

= 1.26 (V) × C

DLY1

(µF)/1.1 (µA) (s)

CTL1

This pin can also be used to control the on/off state with an external signal. In that case, the allowable input voltage range is from 0 V to V

. Note that

during U.V.L.O. and timer latch operation, this pin is connected to ground through a 20 kΩ resistor.

Voltage Regulators AN8049SH

■ Terminal Equivalent Circuits (continued)

Pin No. Equivalent circuit Description I/O

8 Off: I

Start and stop of internal circuits.

100 kΩ

10 RB2: I

SO(OUT)2

200 Ω

SI(OUT)2

30 kΩ

Controls the on/off state. When the input is high: normal operation (V

> 1.2 V)

OFF

When the input is low: standby mode (V

< 0.6 V)

OFF

In standby mode, the total current consumption is held to under 1 µA.

REF

Outputs the internal reference voltage. The reference voltage is 1.26 V (allowance: ±1%) when V

2.4 V and I

is − 0.1 mA. Insert a

REF

capacitor of at least 0.1 µF between V

and ground for phase

REF

compensation.

Connection for a resistor that sets the channel 2 output current. Use a resistor in the range 750 Ω to 15 kΩ.

11 RB1: I

Connection for a resistor that sets the channel 1 output current.

SO(OUT)1

Use a resistor in the range 750 Ω to 15 kΩ.

200 Ω

SI(OUT)1

30 kΩ

12 See pin 11. OUT1: O

Push-pull output. The absolute maximum rating for the output source current is −50 mA. The output source current is set by the external resistor connected to the RB1 pin.

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