Analog Devices ADP1110 Datasheet

Micropower, Step-Up/Step-Down Switching

a

Regulator; Adjustable and Fixed 3.3 V, 5 V, 12 V

FEATURES
Operates at Supply Voltages From 1.0 V to 30 V
Step-Up or Step-Down Mode
Minimal External Components Required
Low-Battery Detector
User-Adjustable Current Limiting
Fixed or Adjustable Output Voltage Versions
8-Pin DIP or SO-8 Package

APPLICATIONS
Cellular Telephones
Single-Cell to 5 V Converters
Laptop and Palmtop Computers
Pagers
Cameras
Battery Backup Supplies
Portable Instruments
Laser Diode Drivers
Hand-Held Inventory Computers

ADP1110

FUNCTIONAL BLOCK DIAGRAMS

SET

ADP1110

V

IN

220mV

REFERENCE

R1

GND

A2

GAIN BLOCK/
ERROR AMP

A1

COMPARATOR

R2

300kΩ

SENSE

OSCILLATOR

DRIVER

ADP1110 Block Diagram—Fixed Output Version

SET

A0

I

SW1

Q1

SW2

LIM

GENERAL DESCRIPTION

The ADP1110 is part of a family of step-up/step-down switch­ing regulators that operate from an input voltage supply as little
as 1.0 V. This very low input voltage allows the ADP1110 to be
used in applications that use a single cell as the primary power
source.

The ADP1110 can be configured to operate in either step-up or
step-down mode, but for input voltages greater than 3 V, the
ADP1111 would be a more effective solution.

An auxiliary gain amplifier can serve as a low battery detector or
as a linear regulator.

The quiescent current of 300 µA makes the ADP1110 useful in
remote or battery powered applications.

ADP1110

V

IN

220mV

REFERENCE

GND

A2

GAIN BLOCK/
ERROR AMP

A1

COMPARATOR

FB

OSCILLATOR

DRIVER

Q1

SW2

A0

I

LIM

SW1

ADP1110 Block Diagram—Adjustable Output Version

The 70 kHz frequency operation also allows for the use of
surface-mount external capacitors and inductors.

Battery protection circuitry limits the effect of reverse current to
safe levels at reverse voltages up to 1.6 V.

REV. 0

Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: [phone] World Wide Web Site: http://www.analog.com
Fax: [phone] © Analog Devices, Inc., 1996

ADP1110–SPECIFICATIONS

(08C to +708C, V

Parameter Conditions V

QUIESCENT CURRENT Switch Off I

INPUT VOLTAGE Step-Up Mode V

= 1.5 V unless otherwise noted)

IN

S

Q

IN

Min Typ Max Units

300 µA

1.15 12.6 V

Step-Down Mode 30 V

COMPARATOR TRIP POINT VOLTAGE ADP1110

OUTPUT SENSE VOLTAGE ADP1110-3.3

ADP1110-5
ADP1110-12

1

2

2

2

V

OUT

210 220 230 mV

3.13 3.30 3.47 V

4.75 5.00 5.25 V

11.4 12.00 12.6 V

COMPARATOR HYSTERESIS ADP1110 4 8 mV

OUTPUT HYSTERESIS ADP1110-3.3 66 130 mV

ADP1110-5 90 180 mV
ADP1110-12 200 400 mV

OSCILLATOR FREQUENCY f

DUTY CYCLE Full Load (VFB < V

)DC626978%

REF

SWITCH ON TIME t

FEEDBACK PIN BIAS CURRENT ADP1110 VFB = 0 V I

SET PIN BIAS CURRENT V

A0 OUTPUT LOW I

REFERENCE LINE REGULATION 1.0 V ≤ V

= V

SET

REF

= 300 µAV

AO

V

= 150 mV

SET

≤ 1.5 V 0.35 %/V

IN

OSC

ON

FB

I

SET

AO

52 70 90 kHz

7.5 10 12.5 µs

150 240 nA

300 500 nA

0.15 0.4 V

1.5 V ≤ VIN ≤ 12 V 0.05 0.1 %/V

SWITCH SATURATION VOLTAGE V

STEP-UP MODE T

A2 ERROR AMP GAIN R

REVERSE BATTERY CURRENT T

CURRENT LIMIT TEMPERATURE V

= 1.5 V, I

IN

to T

MIN

V

= 1.5 V, I

IN

T

to T

MIN

VIN = 5 V, I

= 100 kΩ

L

= +25°C

A

= +25°C –0.3 %/°C

IN, TA

= 400 mA, +25°CV

SW

MAX

= 500 mA, +25°C 400 650 mV

SW

MAX

= 1 A, +25°C 700 1000 mV

SW

3

4

CESAT

A

V

I

REV

1000 5000 V/V

300 500 mV

600 mV

750 mV

750 mA

COEFFICIENT

SWITCH OFF LEAKAGE CURRENT Measured at SW1 Pin, I

T

= +25°C

A

MAXIMUM EXCURSION BELOW GND I

NOTES

1

This specification guarantees that both the high and low trip point of the comparator fall within the 210 mV to 230 mV range.

2

This specification guarantees that the output voltage of the fixed versions will always fall within the specified range. The waveform at the sense pin will exhibit a saw­tooth shape due to the comparator hysteresis.

3

100 kΩ resistor connected between a 5 V source and the AO pin.

4

The ADP1110 is guaranteed to withstand continuous application of +1.6 V applied to the GND and SW2 pins while V

5

All limits at temperature extremes are guaranteed via correlation using standard statistical quality control methods.

Specifications subject to change without notice.

≤ 10 µA, Switch Off V

SW1

T

= +25°C

A

LEAK

SW2

, I

IN

110µA

–400 –350 mV

, and SW1 pins are grounded.

LIM

–2–

REV. 0

ADP1110

WARNING!

ESD SENSITIVE DEVICE

A0

I

LIM

SW1

GND

V

IN

SW2

*FIXED VERSIONS

FB (SENSE)*
SET

1
2
3
4

8
7
6
5

ADP1110

TOP VIEW

(Not to Scale)

T

JMAX

= 90o, θ

JA

= 130oC/W

ABSOLUTE MAXIMUM RATINGS

Input Supply Voltage, Step-Up Mode . . . . . . . . . . . . . . . 15 V

Input Supply Voltage, Step-Down Mode . . . . . . . . . . . . . 36 V

SW1 Pin Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 V

SW2 Pin Voltage . . . . . . . . . . . . . . . . . . . . . . . . . –0.5 V to V

IN

Feedback Pin Voltage (ADP1110) . . . . . . . . . . . . . . . . . . 5.5 V

Switch Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.5 A

Maximum Power Dissipation . . . . . . . . . . . . . . . . . . 500 mW

Operating Temperature Range . . . . . . . . . . . . . 0°C to +70°C

Storage Temperature Range . . . . . . . . . . . . . –65°C to 150°C

Lead Temperature (Soldering, 10 sec) . . . . . . . . . . . . . 300°C

TYPICAL APPLICATION

47µH

1 2

V

I

IN

LIM

1.5V
AA CELL*

OPERATES WITH CELL VOLTAGE ≥1.0V
*ADD 10µF DECOUPLING CAPACITOR IF BATTERY IS

*MORE THAN 2' AWAY FROM ADP1110.

ADP1110-5

GND

5

SW1

SENSE

SW2

4

3

8

5V

15µF
TANTALUM

Figure 1. 1.5 V to 5 V Converter

ORDERING GUIDE

Model Output Voltage Package

ADP1110AN ADJ N-8
ADP1110AR ADJ SO-8
ADP1110AN-3.3 3.3 V N-8
ADP1110AR-3.3 3.3 V SO-8
ADP1110AN-5 5 V N-8
ADP1110AR-5 5 V SO-8
ADP1110AN-12 12 V N-8
ADP1110AR-12 12 V SO-8

PIN CONFIGURATIONS

8-Lead Plastic DIP

(N-8)

8-Lead SOIC

I

1

LIM

ADP1110

2

V

IN

TOP VIEW

3

SW1
SW2

(Not to Scale)

4

= 90o, θ

T

JMAX

*FIXED VERSIONS

(SO-8)

= 150oC/W

JA

8

FB (SENSE)*

7

SET

6

A0

5

GND

PIN DESCRIPTION

Mnemonic Function

I

LIM

For normal conditions this pin is connected to
V

. When lower current is required, a resistor

IN

should be connected between I

and VIN.

LIM

Limiting the switch current to 400 mA is
achieved by connecting a 220 Ω resistor.

V

IN

Input Voltage.

SW1 Collector Node of Power Transistor. For step-

down configuration, connect to V

. For step-

IN

up configuration, connect to an inductor/diode.

SW2 Emitter Node of Power Transistor. For step-

down configuration, connect to inductor/diode.
For step-up configuration, connect to ground.
Do not allow this pin to go more than a diode

drop below ground.
GND Ground.
AO Auxiliary Gain (GB) Output. The open collec-

tor can sink 300 µA. It can be left open if unused.
SET Gain Amplifier Input. The amplifier has posi-

tive input connected to SET pin and negative

input connected to 220 mV reference. It can be

left open if unused.
FB/SENSE On the ADP1110 (adjustable) version this pin

is connected to the comparator input. On the

ADP1110-3.3, ADP1110-5 and ADP1110-12,

the pin goes directly to the internal application

resistor that set output voltage.

CAUTION

ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily
accumulate on the human body and test equipment and can discharge without detection.
Although the ADP1110 features proprietary ESD protection circuitry, permanent damage may
occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD
precautions are recommended to avoid performance degradation or loss of functionality.

REV. 0

–3–

ADP1110-Typical Characteristics

R

LIM

– Ω

1.9

1.7

0.1
1 100010 100

1.5

1.3

0.5

1.1

0.9

0.7

0.3

SWITCH CURRENT – A

STEP-DOWN WITH
V = +12V

R

LIM

– Ω

0.1
1 100010 100

1.5

1.3

0.5

1.1

0.9

0.7

0.3

STEP-UP MODE
WITH V ≤ +5V

SWITCH CURRENT – A

1.4

V

1.2

V

I

SWITCH

IN

= +1.5V

CURRENT – A

1

V

= +1.2V

0.8

0.6

0.4

SATURATION VOLTAGE – V

0.2

0

0.1 1.40.2 0.4 0.5 0.6 0.8 1 1.2 1.25

IN

VIN = +1V

IN

= +2V

V

IN

V

= +5V

IN

= +3V

76

74

72

70

68

66

64

OSCILLATOR FREQUENCY – kHz

62

60

2304 6 8 1012151821 2427

OSCILLATOR FREQUENCY

INPUT VOLTAGE – V

Figure 2. Saturation Voltage vs. I
Mode

2

1.8

1.6

1.4

1.2

1

0.8

ON VOLTAGE – V

0.6

0.4

0.2
0

0.1 0.90.2 0.4 0.6 0.8

Figure 3. Switch ON Voltage vs. I
Down Mode

1800

1600

1400

1200

1000

800

600

QUIESCENT CURRENT – µA

400

200

0

1303 6 9 12 15 18 21 24 27

Figure 4. Quiescent Current vs. Input Voltage

SWITCH

VIN = +12V

I

CURRENT – A

SWITCH

SWITCH

QUIESCENT CURRENT

INPUT VOLTAGE – V

Current in Step-Up

Current In Step-

–4–

Figure 5. Oscillator Frequency vs. Input Voltage

Figure 6. Maximum Switch Current vs. R

Figure 7. Maximum Switch Current vs. R

LIM

LIM

REV. 0

ADP1110

TEMPERATURE – 8C

160

120

07025

145

140

135

125

155

150

BIAS CURRENT

BIAS CURRENT – nA

130

78

76

74

72

70

68

OSCILLATOR FREQUENCY – kHz

66

64

07025

OSCILLATOR FREQUENCY

TEMPERATURE – 8C

Figure 8. Oscillator Frequency vs. Temperature

9.0

8.9

8.8

8.7

8.6

8.5

ON TIME – µs

8.4

8.3

8.2
07025

TEMPERATURE – 8C

SWITCH ON TIME

0.54

0.53

0.52

0.51

– V

0.5

CE(SAT)

V

0.49

0.48

0.47
07025

VIN = +1.5 @ I

TEMPERATURE – 8C

SWITCH

= +0.5A

Figure 11. Switch ON Voltage Step-Down vs. Temperature

350

300

QUIESCENT CURRENT

250

200

150

100

QUIESCENT CURRENT – µA

50

0

07025

TEMPERATURE – 8C

Figure 9. Switch ON Time vs. Temperature

66

65

64

63

62

DUTY CYCLE – %

61

60

59

07025

DUTY CYCLE

TEMPERATURE – 8C

Figure 10. Duty Cycle vs. Temperature

Figure 12. Quiescent Current vs. Temperature

Figure 13. FB Pin Bias Current vs. Temperature

REV. 0

–5–