a
Micropower; Low Cost; Fixed 5 V, 12 V
and Adjustable DC-to-DC Converter
ADP1109
FUNCTIONAL BLOCK DIAGRAM
FEATURES
Operates at Supply Voltages 2 V to 12 V
Fixed 5 V, 12 V and Adjustable Output
Minimum External Components Required
Ground Current 320 mA
120 kHz Oscillator Frequency
Logic Shutdown
8-Pin DIP and SO Package
VIN
R2
250kΩ
GENERAL DESCRIPTION
ADP1109
COMPARATOR
1.25V
REFERENCE
OBS
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
SENSE
A1
SW
120kHz
OSCILLATOR
Q1
DRIVER
R1
OLE
GND
SHUTDOWN
Y
R
A
N
I
L
M
I
A
L
C
E
I
R
N
P
H
C
E
T DATA
TE
PIN CONFIGURATIONS
The ADP1109 is a versatile step-up switching regulator. The
device requires only minimal external components to operate as
a complete switching regulator.
VIN
GND
Package
Option*
ADP1109AN
ADP1109AR
ADP1109AN-5
ADP1109AR-5
ADP1109AN-12
ADP1109AR-12
ADJ
ADJ
5V
5V
12 V
12 V
PDIP
SOIC
PDIP
SOIC
PDIP
SOIC
N-8
SO-8
N-8
SO-8
N-8
SO-8
SENSE
7 SHUTDOWN
5 NC
4
NC = NO CONNECT
8-Lead SOIC
(SO-8 Package)
8 SENSE
VIN 1
ORDERING GUIDE
Package
Description
8
ADP1109
TOP VIEW
SW 3 (Not to Scale) 6 NC
The gated oscillator capability eliminates the need for frequency
compensation.
Output
Voltage
1
NC 2
The ADP1109-5 can deliver 100 mA at 5 V from a 3 V input,
and ADP1109-12 can deliver 60 mA at 12 V from a 5 V input.
The device also features a logic controlled shutdown capability
that when a logic low is applied it will shut the oscillator down.
The 120 kHz operating frequency allows for the use of small
surface mount components.
Model
8-Lead Plastic DIP
(N-8 Package)
NC 2
ADP1109 7 SHUTDOWN
SW 3
TOP VIEW
(Not to Scale)
GND 4
6 NC
5 NC
NC = NO CONNECT
*For outline information see Package Information section.
This information applies to a product under development. Its characteristics and specifications are subject to change without notice.
Analog Devices assumes no obligation regarding future manufacture unless otherwise agreed to in writing.
To obtain the most recent version or complete data sheet, call our fax retrieval system at 1-800-446-6212 or visit our World Wide Web site at http://www.analog.com.
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ADP1109–SPECIFICATIONS (@ T = +258C, V
A
IN
= 3 V, unless otherwise noted)
Parameter
Conditions1
VS
QUIESCENT CURRENT*
Switch Off
IQ
INPUT VOLTAGE*
VIN
COMPARATOR TRIP POINT
VOLTAGE*
ADP1109
OUTPUT VOLTAGE*
ADP1109-5
ADP1109-12
3 V ≤ VIN ≤ 5 V
3 V ≤ VIN ≤ 12 V
OUTPUT VOLTAGE RIPPLE*
VOUT
OBS
DUTY CYCLE*
Full Load
SWITCH ON TIME*
ISW = 500 mA
VIN = 3 V
VIN = 5 V
SWITCH LEAKAGE CURRENT
VSW = 12 V
550
3
Units
µA
V
1.20
1.25
1.30
V
4.75
11.45
5.00
12.00
5.25
12.55
V
V
25
60
50
120
mV
mV
fOSC
100
90
120
140
150
kHz
kHz
DC
45
50
60
%
4.2
5.3
5.5
µs
µs
0.4
0.5
0.5
0.7
0.8
0.8
V
V
1
10
µA
OLE
SWITCH SATURATION VOLTAGE*
ADP1109-5
ADP1109-12
SHUTDOWN PIN LOW*
320
ADP1109-5
ADP1109-12
OSCILLATOR FREQUENCY*
SHUTDOWN PIN HIGH*
ADP1109
Typ
Max
Min
tON
3.3
3.0
VCESAT
Y
R
A
N
I
L
M
I
A
L
C
E
I
R
N
P
H
C
E
T DATA
VIH
VIL
SHUTDOWN PIN INPUT CURRENT*
VSHUTDOWN = 4 V
IIH
SHUTDOWN PIN INPUT CURRENT*
VSHUTDOWN = 0 V
IIL
2.0
TE
V
0.8
V
10
µA
20
µA
NOTES
*Denotes the specifications that apply over the full operating temperature range.
Specifications subject to change without notice.
This information applies to a product under development. Its characteristics and specifications are subject to change without notice.
Analog Devices assumes no obligation regarding future manufacture unless otherwise agreed to in writing.
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REV. 0