AP1603_10_技术文档

AP1603

STEP-UP DC/DC CONVERTER

Description

Pin Assignments

The AP1603 is a high efficiency step-up DC/DC converter for

applications using as few as a single NiMH or Li-Ion battery

cells. Only four external components are required to deliver a

fixed output voltage of 3.3V. The AP1603 starts up from less

than 0.9V input with 1mA load. Pulse Frequency Modulation

scheme brings optimized performance for applications with

light output loading and low input voltages. The output ripple

and noise are lower compared with the circuits operating in

PSM mode.

( Top View )

1

6

5

FB

SHDN

OUT

AP1603

2

3

GND

REF

7

4 LX

SOT26

The PFM control circuit operating in 150KHz (max.) switching

rate results in smaller passive components. The space saving

SOT26 packages make the AP1603 an ideal choice of DC/DC

converter for space conscious applications, like pagers,

electronic cameras, and wireless microphones.

Features

Applications

•

Pagers

•

A Guaranteed Start-Up from less than 0.9 V

High Efficiency

Cameras

Wireless Microphones

Pocket Organizers

Low Quiescent Current

Less Number of External Components needed

Low Ripple and Low Noise

Battery Backup Suppliers

Portable Instruments

Space Saving Lead Free Package: SOT26

Lead Free Finish/ RoHS Compliant (Note 1)

Notes: 1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at

http://www.diodes.com/products/lead_free.html.

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June 2010

AP1603

Document number: DS31131 Rev. 3 - 2

AP1603

STEP-UP DC/DC CONVERTER

Typical Application Circuit

(1) V_OUT= 5V

22uH

1.1V to 5.5V

V_IN

+

47uF

ON

LX

OUT

OFF

SHDN

REF

Fixed Output

( 5V )

+

47uF

GND

FB

0.1uF

(2) V_OUT= 3.3V

22uH

1.1V to 3.6V

V_IN

+

47uF

ON

OFF

LX

SHDN

REF

Fixed Output

( 3.3V )

OUT

+

47uF

GND

FB

0.1uF

(3) V_OUT= Adj

22uH

1.1V to 5.5V

V_IN

+

47uF

ON

LX

OUT

OFF

SHDN

REF

Output

47uF

+

R2

R1

GND

FB

0.1uF

R2

V_OUT= V_REF(1+

)

R1

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www.diodes.com

June 2010

AP1603

Document number: DS31131 Rev. 3 - 2

AP1603

STEP-UP DC/DC CONVERTER

Pin Descriptions

Pin Name

Description

FB

GND

REF

LX

Feedback.

Ground.

1.2V Reference Voltage. Bypass with a 0.1μF capacitor.

N-Channel and P-Channel Power MOSFET Drain.

Power Output. OUT provides bootstrap power to the IC.

OUT

Shutdown Input. Drive high (>80% of V_OUT) for operating mode. Drive low

(<20% of V_OUT) for shutdown mode. Connect to OUT for normal operation.

SHDN

Functional Block Diagram

V_OUT

0.1uF

Zero

Crossing

Amplifier

Minimum

Off-Time

One-Shot

SHDN

47uF

EN

TRIG

Q

One-Shot

P

N

V_IN

LX

22uH

47uF

F/F

S

Q

R

Maximum

On-Time

One-Shot

FB connects to

Vcc or GND

Current-Limit

Amplifier

Q

TRIG

GND

One-Shot

Error

Amplifier

FB connects to

external feedback

resistors

FB

0.1uF

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June 2010

AP1603

Document number: DS31131 Rev. 3 - 2

AP1603

STEP-UP DC/DC CONVERTER

Absolute Maximum Ratings

Symbol

Parameter

Rating

-0.3 to 5.5

Unit

V

V_CC

V_REF

V_SW

I_OUT

I_SW

Supply Voltage (OUT to GND)

REF to GND

-0.3 to V_OUT+0.3

-0.8 to 0.2

V

Switch Voltage (LX to GND)

Output Current (OUT)

V

A

Switch Current (LX)

-0.8 to 0.2

A

T_ST

Storage Temperature Range

Operation Temperature Range

-65 to +150

-40 to +85

^oC

T_OP

Electrical Characteristics

(V_IN= 2V, FB = V_OUT, R_L= ∞, T_A= 0°C to +85°C, unless otherwise noted. Typical values are at T_A= +25°C)

Symbol

Parameter

Conditions

Min

Typ.

Max

Unit

Minimum Input Voltage

Operating Voltage

-

0.9

-

V

V_IN

T_A= +25°C

1.1

5.5

T_A= +25°C,

RL = 3kΩ (Note 2)

Start-Up Voltage

-

0.9

1.1

V

Start-Up Voltage Tempco

Output Voltage Range

-

2

100

-4

-

150

-

5.5

-

mV/°C

V

FB = V_OUT= 3.3V

V_IN= 2.4V, FB = GND,

V_OUT= 5V

Steady-State Output Current

(Note 3)

I_OUT

mA

-

80

-

V_REF

V_OUT

Reference Voltage

Output Voltage

I_REF= 0

FB = V_OUT

FB = GND

1.196

3.17

4.8

1.22

3.3

5

1.244

3.43

5.2

V

TEMPCO Reference Voltage Tempco

-

0.05

-

mV/°C

mV

Reference Voltage Load

Regulation

V_{REF_LOAD}

I_REF= 0 to 20μA

V_IN= 1.1V to 3.6V

I_LX= 100mA

-

15

80

1.5

1.0

0.4

Reference Voltage Line

Regulation

V_{REF_LINE}

0.08

0.6

mV/V

ꢀ

Internal NFET, PFET On-

Resistance

R_{DS (ON)}

-

LX Switch Current Limit

(NFET)

I_LIM

0.3

0.35

A

I_LEAK

LX Leakage Current

Operating Current into OUT V_OUT= 3.3V

V_LX= 0, 5.5V; V_OUT= 5.5V

-

0.05

16

1

35

μA

Shutdown Current into OUT

-

0.1

1

μA

SHDN = GND

Efficiency

LX Switch On-Time

LX Switch Off-Time

V_OUT= 3.3V, I_LOAD= 100mA

-

3

1.0

90

4

1.2

-

7

1.4

%

μs

t_ON

t_OFF

= 0 or V_OUT

V_SHDN

-

0.07

50

nA

SHDN Input Current

SHDN Input Voltage

I_SHDN

V_IL

V_IH

-

0.2

-

Based on V_OUTVoltage

V_OUT

0.8

Notes:

2. Start-up voltage operation is guaranteed with the addition of a Schottky 1N5819 external diode between the input and output.

3. Steady-state output current indicates that the device maintains output voltage regulation under load.

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June 2010

AP1603

Document number: DS31131 Rev. 3 - 2

AP1603

STEP-UP DC/DC CONVERTER

Typical Performance Characteristics

Steady Stage Output Current vs.

Input Voltage

Reference Voltage vs. Temperature

1.23

400

320

240

160

80

1.22

1.21

1.20

1.19

1.18

-40

-20

0

20

40

60

80

0

1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0

Temperature (°C)

Input Voltage (V)

No Load Input Current vs.

Input Voltage

Start-up Voltage vs. Load Current

175

150

125

100

75

2.0

1.8

1.6

1.4

1.2

1.0

0.8

with diode

1N5819

without diode

50

0

3

9

18

39

59

79

99

Input Voltage (V)

Load Current (mA)

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June 2010

AP1603

Document number: DS31131 Rev. 3 - 2

AP1603

STEP-UP DC/DC CONVERTER

Typical Performance Characteristics (Continued)

Efficiency vs. Load Current

91

92

91

90

89

88

87

86

85

84

83

82

81

80

V_IN= 1.2V

V_IN= 2.4V

V_OUT= 3.3V

90

V_OUT= 3.3V

89

88

87

86

85

84

83

82

Load Current (mA)

Shoutdown Current vs. Supply Voltage

Shutdown Threshold Voltage

1.0

0.8

1.6

1.4

1.2

1.0

0.8

0.6

0.4

0.2

0.0

0.6

0.4

0.2

0.0

-0.2

-0.4

-0.6

-0.8

-1.0

1

2

3

4

1.0

1.5

2.0

2.5

3.0

3.5

4.0

Supply Voltage (V)

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www.diodes.com

June 2010

AP1603

Document number: DS31131 Rev. 3 - 2

AP1603

STEP-UP DC/DC CONVERTER

Functions Description

General Description

AP1603 PFM (Pulse Frequency Modulation) converter IC series combine a switch mode converter, power

MOSFET, and precision voltage reference in a single monolithic device. They offer both extreme low quiescent

current, high efficiency, and very low gate threshold voltage to ensure start-up with low battery voltage (0.9V

typ.). Designed to maximize battery life in portable products, and minimize switching losses by only switching as

needed to service the load. PFM converters transfer a discrete amount of energy per cycle and regulate the

output voltage by modulating switching frequency with the constant turn-on time. Switching frequency depends

on the load, input voltage, and inductor value, and it can range up to 150KHz. The SW on resistance is typically

1 to 1.5 W to minimize switch losses. When the output voltage drops, the error comparator enables 150KHz

oscillator that turns on the MOSFET around 7.5us and 2.5ms off time. Turning on the MOSFET allows inductor

current to ramp up, storing energy in a magnetic field and when MOSFET turns off that force inductor current

through the diode to the output capacitor and load. As the stored energy is depleted, the current ramp down until

the diode turns off. At this point, inductor may ring due to residual energy and stray capacitance. The output

capacitor stores charge when current flow through the diode is high, and release it when the current flow is low,

thereby maintaining a steady voltage across the load. As the load increases, the output capacitor discharges

faster and the error comparator initiates cycles sooner, increasing the switching frequency. The maximum duty

cycle ensures adequate time for energy transfer to output during the second half of each cycle. Depending on

the circuit, PFM converter can operate in either discontinuous mode or continuous conduction mode. Continuous

conduction mode means that the inductor current does not ramp to zero during each cycle.

Inductor Selection

To operate as an efficient energy transfer element, the inductor must fulfill three requirements. First, the

inductance must be low enough for the inductor to store adequate energy under the worst-case condition of

minimum input voltage and switch ON time. Second, the inductance must also be high enough so the maximum

current rating of AP1603 and inductor are not exceeded at the other worst-case condition of maximum input

voltage and ON time. Lastly, the inductor must have sufficiently low DC resistance so excessive power is not lost

as heat in the windings. But unfortunately this is inversely related to physical size. Minimum and Maximum input

voltage, output voltage and output current must be established before an inductor can be selected.

Capacitor Selection

A poor choice for an output capacitor can result in poor efficiency and high output ripple. Ordinary aluminum

electrolyzers, while inexpensive, may have unacceptably poor ESR and ESL. There is a low ESR aluminum

capacitor for switch mode DC-DC converters which work much better than the general purpose unit. Tantalum

capacitors provide still better performance at more expense. OS-CON capacitors have extremely low ESR in a

small size. If capacitance is reduced, the output ripple will increase. Most of the input supply is supplied by the

input bypass capacitor. The capacitor voltage rating should be at least 1.25 times greater than a maximum input

voltage.

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June 2010

AP1603

Document number: DS31131 Rev. 3 - 2

AP1603

STEP-UP DC/DC CONVERTER

Ordering Information

AP1603 W L - 7

Package

Lead Free

Packing

L : Lead Free

7 : Tape & Reel

W : SOT26

7” Tape and Reel

Packaging

(Note 4)

Package

Code

Device

Quantity

3000/Tape & Reel

Part Number Suffix

-7

W

SOT26

AP1603WL-7

Notes: 4. Pad layout as shown on Diodes Inc. suggested pad layout document AP02001, which can be found on our website at

http://www.diodes.com/datasheets/ap02001.pdf.

Marking Information

(1) SOT26

( Top View )

6

4

5

XX : Identification code

Y : Year 0~9

W X

XX Y

W : Week : A~Z : 1~26 week;

a~z : 27~52 week; z represents

52 and 53 week

X : a~z : Lead Free

1

2

3

Part Number

Package

Identification Code

AP1603W

SOT26

EY

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June 2010

AP1603

Document number: DS31131 Rev. 3 - 2

AP1603

STEP-UP DC/DC CONVERTER

Package Outline Dimensions (All Dimensions in mm)

(1) Package Type: SOT26

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June 2010

AP1603

Document number: DS31131 Rev. 3 - 2

AP1603

STEP-UP DC/DC CONVERTER

IMPORTANT NOTICE

DIODES INCORPORATED MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO THIS

DOCUMENT, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A

PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION).

Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other

changes without further notice to this document and any product described herein. Diodes Incorporated does not assume any liability

arising out of the application or use of this document or any product described herein; neither does Diodes Incorporated convey any

license under its patent or trademark rights, nor the rights of others. Any Customer or user of this document or products described

herein in such applications shall assume all risks of such use and will agree to hold Diodes Incorporated and all the companies

whose products are represented on Diodes Incorporated website, harmless against all damages.

Diodes Incorporated does not warrant or accept any liability whatsoever in respect of any products purchased through unauthorized

sales channel.

Should Customers purchase or use Diodes Incorporated products for any unintended or unauthorized application, Customers shall

indemnify and hold Diodes Incorporated and its representatives harmless against all claims, damages, expenses, and attorney fees

arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized application.

Products described herein may be covered by one or more United States, international or foreign patents pending. Product names

and markings noted herein may also be covered by one or more United States, international or foreign trademarks.

LIFE SUPPORT

Diodes Incorporated products are specifically not authorized for use as critical components in life support devices or systems without

the express written approval of the Chief Executive Officer of Diodes Incorporated. As used herein:

A. Life support devices or systems are devices or systems which:

1. are intended to implant into the body, or

2. support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided

in the labeling can be reasonably expected to result in significant injury to the user.

B. A critical component is any component in a life support device or system whose failure to perform can be reasonably expected

to cause the failure of the life support device or to affect its safety or effectiveness.

Customers represent that they have all necessary expertise in the safety and regulatory ramifications of their life support devices or

systems, and acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements

concerning their products and any use of Diodes Incorporated products in such safety-critical, life support devices or systems,

notwithstanding any devices- or systems-related information or support that may be provided by Diodes Incorporated. Further,

Customers must fully indemnify Diodes Incorporated and its representatives against any damages arising out of the use of Diodes

Incorporated products in such safety-critical, life support devices or systems.

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June 2010

AP1603

Document number: DS31131 Rev. 3 - 2


型号：	AP1603_10
厂家：	DIODES INCORPORATED
描述：	STEP-UP DC/DC CONVERTER 升压型DC / DC转换器转换器
文件：	总10页 (文件大小：182K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

AP1603_10 [DIODES]

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