AAT1104 - Advanced Analog Technology, Inc.

Advanced Analog Technology, Inc.

– 台灣類比科技股份有限公司 –

Advanced Analog Technology, Inc. V 1.0

AAT1104/AAT1104A

2-CHANNEL SWITCHING REG U LATOR CONTROLLER

Features

z Complete PWM Power Control Circuitry

z Precision Reference：2.505V±1% (25 oC)

z Under-voltage Lockout Protection

z Open Drain Output

z Output Short Circuit Protection

z Low Dissipation Current：1.6mA

z Dead Time Control：0 to 100%

z Wide Operating Frequency：

10kHz to 800kHz

z VDD range：4.0V to 6.5V

Pin Configuration

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

CT

RT

INV1

FB1

DTC1

GND

OUT1

Vref

NON2

SCP

INV2

FB2

DTC2

OUT2

TOP V IEW

(TSSOP-1 6 P AC KAGE)

NON1

VDD

General Description

The AAT1104/AAT1104A provides an integrated

two-channel pulse-width-modulation (PWM)

solution for the power supply of DC-DC system,

this device offers the systems engineer the

flexibility to tailor the power supply circuitry to a

specific application. Each channel contains its own

error amplifier, PWM comparator, dead–time

control and output driver. The under-voltage

protection, oscillator, short circuit protection and

voltage reference circuit are common for the two

channels.

Both channel of AAT1104/AAT1104A can be used

for DC/DC converter operations including step-up,

step-down, and inverting. Dead-time control (DTC)

can be set to provide 0% to 100% dead time by

resistive divider network. Soft start can be

implemented by paralleling the DTC resistor with a

capacitor. Two dead time control inputs are

assigned for Ch-1 and Ch-2 individually, and dead

time control inputs can be used to control on / off

operation.

With a minimum number of external components,

the AAT1104/AAT1104A offers a simple and cost

effective solution.

*Spec is subject to change without notice in this document.

Advanced Analog Technology, Inc.

– 台灣類比科技股份有限公司 –

Advanced Analog Technology, Inc. V 1.0

AAT1104/AAT1104A

Pin Description

Pin # Name I/O Description

1 CT I External timing capacitance

2 RT I External timing resistance

3 NON1 I Positive input for error amplifier 1

4 INV1 I

N

egative input for error amplifier 1

5 FB1 I Output for error amplifier 1

6 DTC1 I Output 1 dead time / soft start setting

7 OUT1 O Output 1

8 GND Ground

9 VDD I Power supply

10 OUT2 O Output 2

11 DTC2 I Output 2 dead time / soft start setting

12 FB2 I Output for error amplifier 2

13 INV2 I

N

egative input for error amplifier 2

14 NON2 I Positive input for error amplifier 2

15 SCP I Timer latch setting

16 Vref O Reference voltage (2.505V) output

Advanced Analog Technology, Inc.

– 台灣類比科技股份有限公司 –

Advanced Analog Technology, Inc. V 1.0

AAT1104/AAT1104A

Absolute Maximum Ratings

CHARACTERISTICS SYMBOL VALUE UNIT

Supply voltage DD

V 7 V

Input voltage (IN-, DTC) I

V DD

V V

Output voltage O

V DD

V +0.3 V

Output current O

I 120 mA

Operating free-air temperature range ope

T -20 to 85 oC

Storage temperature range stg

T -65 to 150 oC

Power dissipation Pd 500 mW

Recommended Ope rating Conditions

Symbol Min Max Unit

Supply voltage, DD

V DD

V 4.0 6.5 V

Input voltage, IN1, IN2 Vcm 0.5 1.6 V

Output voltage O

V 0 DD

V V

OSC capacitor T

C 100 15000 pF

OSC resistor (Note 1) T

R 5.1 50 kΩ

Oscillator f requency OSC

f 10 800 kHz

Output current, Iout1, Iout2 O

I 100 mA

Operating free-air temperature ope

T -20 85 oC

Advanced Analog Technology, Inc.

– 台灣類比科技股份有限公司 –

Advanced Analog Technology, Inc. V 1.0

AAT1104/AAT1104A

Electrical Characteristics, DD

V= 5.0V (Unless Otherwise Specified) (See Note 1)

Oscillator Parameter Test Condition Min Typ Max Unit

Frequency OSC

f T

C = 220pF, T

R = 10kΩ320 400 480 KHz

Frequency change with DD

V dV

f DD

V = 4.0V to 6.0V,

A

T= 25

oC

T

C = 220pF, T

R = 10kΩ

1 %

Under-voltage Protection

Parameter Test Condition Min Typ Max Unit

Upper threshold voltage UPH

V A

T= 25

oC 2.6 2.9 3.2 V

Lower threshold voltage UPL

V A

T= 25

oC 2.23 2.53 2.83 V

Hysteresis ( UPH

V –

UPL

V) HYS

V A

T= 25

oC 0.37 V

Short Circuit Protection Control

Parameter Test Condition Min Typ Max Unit

Ch-1, 2 0.95 1.05 1.15 Input threshold voltage

1r

V AAT1104A only 1.02 1.18 1.34 V

1.48 1.64 1.8 Short-circuit detect threshold

voltage 2r

V AAT1104A only 0.6 0.7 0.8

V

-1.5 -2.5 -3.5 SCP terminal source current

SCP

I AAT1104A only -10 -15 -20

µA

Standy Voltage VSTB 50 100 mV

Latch Voltage VLT 30 100 mV

Note1: Typical values of all parameters are specified at A

T=25 oC.

Advanced Analog Technology, Inc.

– 台灣類比科技股份有限公司 –

Advanced Analog Technology, Inc. V 1.0

AAT1104/AAT1104A

Electrical Characteristics, DD

V = 5.0V (Unless Otherwise Specified) (See Note 1) (continued)

Reference Voltage

Parameter Test Conditions Min Typ Max Unit

Reference voltage REF

V mA1IREF −= ,A

T= 25

oC 2.48 2.505 2.53 V

Input voltage regulation RI

V mA1IREF −= ,

VDD = 4.0V to 6.0V 1 5 mV

Output regulation RO

V mA1.0IREF −= to -3mA 1 10 mV

EA (Error Amplifier)

Parameter Test Condition Min Typ Max Unit

Input offset voltage IO

V Ch-1,2, AV=1 6 mV

Input bias current IB

I Ch-1,2 ±15 ±100 nA

Input voltage range IR

V Ch-1,2 0.5 1.6 V

Open-loop voltage

amplification VD

A

70 85 dB

+OM

V

2.3 2.5

Output voltage swing

−OM

V

0.7 0.9

V

Output sink current +OM

I

FB=1.25V 3 20 mA

Output source current −OM

I

FB=1.25V -45 -75 µA

Common-mode rejection ratio CMRR 60 80 dB

Advanced Analog Technology, Inc.

– 台灣類比科技股份有限公司 –

Advanced Analog Technology, Inc. V 1.0

AAT1104/AAT1104A

Electrical Characteristics, DD

V = 5.0V (Unless Otherwise Specified) (See Note 1) (continued)

Dead Time Control & PWM

Parameter Test Condition Min Typ Max Unit

Input bias current BDT

I DTC

V= 2V 0.1 1 µA

Duty = 0%, OSC

f = 10kHz 1.87 1.97 2.07

0d

V

AAT1104A only 1.85 2.05 2.25

Duty = 100%, OSC

f = 10kHz 1.38 1.48 1.58

Input threshold voltage

(DTC)

100d

V

AAT1104A only 1.2 1.45 1.7

V

Latch input voltage VDT I

DT = 40µA 2.28 2.48 V

Latch mode source current IDT DTC1,2=0V -200 -560 µA

Output Stage

Parameter Test Condition Min Typ Max Unit

Saturation voltage VSAT IO = 75mA（CH-1,2） 0.8 1.2 V

Leakage current Ipeak V

o =6.0V 5 µA

Operating Current

Parameter Test Condition Min Typ Max Unit

OFFDD

I− Output ”OFF “state 1.3 mA

Supply current

ONDD

I− RRT =10kΩ 1.6 mA

Advanced Analog Technology, Inc.

– 台灣類比科技股份有限公司 –

Advanced Analog Technology, Inc. V 1.0

AAT1104/AAT1104A

Function Block Diagram

SCP VREF

UVLO

FB1

NON1

INV1

NON2

INV2

FB2

DTC1

DTC2

SCP

UVC

LATCH

UVC

Vref

Vref Vref

VDD

RT

GND

CT

LATCH

PWM

UVC

Err-Amp

UVC

OSC

Vref

VDD

Scpcomp

OUT1

OUT2

Advanced Analog Technology, Inc.

– 台灣類比科技股份有限公司 –

Advanced Analog Technology, Inc. V 1.0

AAT1104/AAT1104A

Application Circuit

AAT1104

AAT1104A

OUT1

OUT2

VDD

Q1 VN1

D1

C9

L1

R11

R17

R18

VDD

Q3

Q4

NON1

FB1

INV1

NON2

FB2

INV2

CT

RT

GND SCP

DTC2

DTC1

VREF

R12

R13

VN1

R1

R2

VREF R3

R4

R5

C1

VP2

R6

C2

VREF

R14

R15

CT RT

C3

R8 R10

C5

R9R7C4

Q2

L2

C8 D3

D4

C7

VP3

VP2

D2

C10

option circuit:

ch a r g e p ump c ir c uit

R16

Step_up

output

Inverting

output

VDD VDD

Advanced Analog Technology, Inc.

– 台灣類比科技股份有限公司 –

Advanced Analog Technology, Inc. V 1.0

AAT1104/AAT1104A

Timing Chart

AAT1104

1.64V

2.53V Lockout free

1.97V

1.48V

tDT

1.05V

FB CT

DTC

PWMOUTPUT

OUTPUT

SCP

SCPCOMP

VDD

Advanced Analog Technology, Inc.

– 台灣類比科技股份有限公司 –

Advanced Analog Technology, Inc. V 1.0

AAT1104/AAT1104A

Timing Chart

AAT1104A

0.7V

2.53V Lockout free

2.05V

1.45V

tDT

1.18V

FB CT

DTC

PWMOUTPUT

OUTPUT

SCP

SCPCOMP

VDD

Advanced Analog Technology, Inc.

– 台灣類比科技股份有限公司 –

Advanced Analog Technology, Inc. V 1.0

AAT1104/AAT1104A

Package Dime nsion (Unit: Mil)

A1 0.05 0.10 0.15 0.002 0.004 0.006

A 2 1.00 1.05 0.039 0.041

b0.20 0.25 0.28 0.008 0.010 0.011

C 0.127 0.005

D4.90 5.075 5.10 0.193 0.1998 0.200

E6.20 6.40 6.60 0.244 0.252 0.260

E1 4.30 4.40 4.50 0.170 0.173 0.177

e 0.65 0.026

L0.5 0.60 0.70 0.02 0.024 0.028

y 0.076 0.003

Θ0° 4° 8° 0° 4° 8°

D

E

1

A2

A

A1

12°

b

y

e