AIC AIC1631CN 2-cell, 500ma, step-up dc/dc converter Datasheet

AIC1631
2-Cell, 500mA, Step-Up DC/DC Converter
DESCRIPTION
FEATURES
High Efficiency 90%.
Adjustable Output Voltage with Two Resistors
(AIC1631A)
The AIC1631 is a high efficiency step up DCDC converter. Only four external components
are required to deliver a fixed voltage of 3V,
Power-Saving Shutdown Mode (7µA typical).
Internal 2A Switch.
120KHz Switching Rate.
Adjustable Switch Current Limit.
On-Chip Low Battery Detector.
3.3V, or 5V. The output voltage can be externally set to an arbitrary value below breakdown
voltage of the power switch for AIC1631A. Efficiency beyond 87% can be easily achieved at
100mA load with 2.2V to 3V input voltages.
APPLICATIONS
Logic-controlled shutdown mode is provided for
Palmtop & Notebook Computers.
Pocket Organizers.
Cameras.
Pagers.
Battery Backup Supplies.
Portable Instruments.
power saving. Switch current limit can be programmed with a resistor. The low battery detector can be configured as a linear regulator or
a burst mode controller performing an extremely
low supply current operation.
120KHz switching rate reduces the inductor size.
Inductors of 25µH to 50µH inductance are
re-
commended for most applications.
TYPICAL APPLICATION CIRCUIT
100Ω
+VIN
R1
L
1N5819
D1
+VOUT
(3.3V)
LOAD
50µH
NORMAL
+
C1
100µF
RILIM
SD
+
C2
100µF
ILIM/SD
LBI
SW
LBO
SGND
Note: VIN≥1.8V, VOUT≤7V
VOUT
VIN
CGND
AIC1631
High Efficiency Step-Up DC/DC Converter
Analog Integrations Corporation
4F, 9, Industry E. 9th Rd, Science Based Industrial Park, Hsinchu Taiwan, ROC
DS-1631-04 Dec 27, 00
TEL: 886-3-5772500
FAX: 886-3-5772510
www.analog.com.tw
1
AIC1631
ORDERING INFORMATION
AIC1631 XXX
PIN CONFIGURATION
ORDER NUMBER
AIC1631CN
AIC1631-3CN
AIC1631-5CN
(PLASTIC DIP )
PACKAGE TYPE
N: PLASTIC DIP
S: SMALL OUTLINE
TEMPERATURE RANGE
C=0°C~+70°C
OUTPUT VOLTAGE
DEFAULT: 3.3V
3: 3.0V
5: 5.0V
A: Adjustable
TOP VIEW
AIC1631CS
AIC1631-3CS
AIC1631-5CS
(PLASTIC SO)
AIC1631ACN
(PLASTIC DIP )
VOUT
ILIM/SD 1
8
VIN 2
7
LBI
SW 3
6
LBO
SGND 4
5
CGND
ILIM/SD 1
8
VOUT
VIN 2
7
LBI
EXT 3
6
LBO
GND 4
5
FB
TOP VIEW
AIC1631ACS
(PLASTIC SO)
ABSOLUTE MAXIMUM RATINGS
Supply Voltage ......................................…………....................…………....................... 7.0V
Operating Temperature Range.....................……..............………................... -20°C ~ 80°C
Storage Temperature Range .......................………...................………....... -65°C ~ 150°C
TEST CIRCUIT
Refer to Typical Application Circuit.
ELECTRICAL CHARACTERISTICS (V
IN=3.0V,
PARAMETER
TEST CONDITIONS
Input Voltage
Fig. 4 in Appl. Examples
Output Voltage
ILOAD =200mA
AIC1631
AIC1631-3
AIC1631-5
Switch off Current
No Load Current
AIC1631/AIC1631-3
AIC1631-5
Shutdown Mode Current
Shutdown Recovery Time
Ta=25°°C, unless otherwise specified.)
MIN.
TYP.
MAX.
UNIT
7
V
3.3
3
5
3.44
3.12
5.20
V
105
140
µA
1.5
3.16
2.88
4.80
7
VIN=2.5V, ILOAD =200mA
µA
160
180
0.4
15
µA
mS
2
AIC1631
ELECTRICAL CHARACTERISTICS (CONTINUED)
PARAMETER
TEST CONDITIONS
Efficiency
Line Regulation
Load Regulation
MIN.
TYP.
MAX.
UNIT
ILOAD =200mA
AIC1631/AIC1631-3
AIC1631-5
87
90
%
ILOAD =100mA
AIC1631, VIN=1.8 ~ 3.3V
AIC1631-3, VIN=1.8 ~ 3V
AIC1631-5, VIN=2.2 ~ 3.3V
0.6
0.5
0.8
%VOUT
ILOAD =10~300mA
AIC1631/AIC1631-3
AIC1631-5
0.3
0.8
%VOUT
Oscillator Frequency
LBI Pin Trip Point
90
120
150
KHz
1.17
1.22
1.27
V
0.598
0.617
0.636
V
FB Threshold Voltage
AIC1631A
SW “ON Resistance”
AIC1631/AIC1631-3
AIC1631-5
0.5
0.4
Ω
LBO “ON Resistance”
VIN=2V
45
Ω
SW Off Leakage
1
µA
Input Pin Bias Current
10
nA/Pin
Output Pin Leakage
10
nA/Pin
TYPICAL PERFORMANCE CHARACTERISTICS
Switch Voltage vs. Current
1
SW ON Resistance vs. Temperature
0.58
AIC1631/1631-3
Ta=25°C
.0.54
AIC1631/1631-3
AIC1631-5
SW RDS (Ω)
VSW (V)
0.75
0.5
0.5
AIC1631-5
0.46
0.42
0.25
0.38
0
0
0.5
1
1.5
ISW (A)
2
2.5
3
0.36
0
20
40
60
80
Temperature (°C)
3
AIC1631
TYPICAL PERFORMANCE CHARACTERISTICS (CONTINUED)
No Load Supply Current vs. Input Voltage
200
Ta=25°C
190
No Load Supply Current vs. Temperature
210
200
180
IS (µA)
190
IS (µA)
AIC1631-5
170
160
AIC1631-5
180
170
AIC1631/1631-3
140
AIC1631/1631-3
160
150
1
1.5
2.0
2.5
3.0
VIN (V)
3.5
4.0
4.5
5.0
150
0
9.4
7.8
6.6
IS (µA)
IS (µA)
9.0
7.6
7.8
7.2
7.4
1
1.5
2
2.5
3
VIN (V)
3.5
4
4.5
7.0 0
5
Oscillator Frequency (KHz)
Ta=25°C
90
70
3
VIN (V)
40
60
80
123
110
2
20
Oscillator Frequency vs. Temperature
Oscillator Frequency vs. Input Voltage
1
VIN=3V
Temperature (°C)
130
Frequency (KHz)
Shutdown Mode Supply Current vs. Temperature
8.2
7.4
60
80
Ta=25°C
8.0
7.0
60
Temperature (°C)
Shutdown Mode Supply Current vs. Input Voltage
8.2
40
20
4
5
121
VIN=3V
119
117
0
20
40
60
80
Temperature (°C)
4
AIC1631
TYPICAL PERFORMANCE CHARACTERISTICS (CONTINUED)
Maximum Load Current vs. Switch Current Limit
Resistance
600
Maximum Load Current (mA)
Maximum Load Current (mA)
Maximum Load Current vs. Switch Current Limit
Resistance
AIC1631/1631-3
Ta=25°C
(5% VOUT Drop)
500
400
300
VIN=2.2V
200
VIN=2.5V
VIN=2.0V
VIN=1.8V
100
0
0
200
400
600
800
600
400
VIN=2.7V
300
VIN=2.2V
VIN=2.5V
200
VIN=2.0V
100
0
1000
AIC1631/1631-3
Ta=25°C
(5% VOUT Drop)
500
0
VIN=1.8V
50
RILIM (KΩ)
100
150
200
RILIM (KΩ)
BLOCK DIAGRAM
ILIM/SD
-
Current Limit
VOUT
+
VIN
100mV
SW
0.617V
+
LBI
-
Shutdown
A
+
1.22V
LBO
OSC
SGND
CGND
5
AIC1631
PIN DESCRIPTIONS
AIC1631/ AIC1631-3 / AIC1631-5
AIC1631A
PIN 1: ILIM/SD- 1. Connected to VIN pin
through a resistor to set the
switch peak current. It
serves to protect IC and inductor, as well as to improve efficiency and output
ripples. However, supply
capability of the AIC1631 is
limited by the current limit
resistor. (See typical performance characteristics).
The ILIM/SD pin should be
shorted to VIN pin if limiting
on switch peak current is
not intended.
PIN 1: ILIM/SD-
PIN 2: VIN
-
Input supply.
PIN 3: SW
-
Drain of the power switch, to be
connected to inductor/ diode.
PIN 4: GND
-
Ground.
PIN 5: FB
-
Output voltage can either be
internally set to 5 volt by
grounding FB pin, or be externally set to an arbitrary voltage
by applying to FB pin the divider
voltage of two divider resistors.
-
Input supply.
PIN 3: SW
-
Drain of the power switch, to
be connected to inductor/ diode.
PIN 4:SGND -
Ground connected to source of
power switch.
PIN 5:CGND -
Ground for control circuits of
the IC. It should be separated
from SGND to avoid the interference.
PIN 7:LBI
-
2. The AIC1631A goes in shutdown mode and consumes less
than 10µA when ILIM/SD pin is
pulled to ground.
2. The AIC1631 goes in shutdown mode and consumes
less than 10µA when
ILIM/SD pin is pulled to
ground.
PIN 2: VIN
PIN 6:LBO
1. Connected to VIN pin
through a resistor to set the
switch peak current. It serves to
protect IC and inductor, as well
as to improve efficiency and
output ripples. However, supply
capability of the AIC1631A is
limited by the current limit resistor. (See typical performance
characteristics). The ILIM/SD pin
should be shorted to VIN pin if
limiting on switch peak current is
not intended.
VOUT voltage is given by the
following equation:
R1 VOUT
=
−1
R2 0.617
where R1 = Resistor connected
Open drain output of the battery low detector, with 45Ω
“ON resistance” at VIN=2V. It is
pulled low when the voltage on
LBI pin is below 1.22V.
-
The noninverting input of the
battery low detector, of which
the inverting input is internally
connects to 1.22V voltage reference.
PIN 8:VOUT -
The output voltage feedbacks
to the IC through this pin.
between FB pin and VOUT pin.
R2= Resistor connected between FB pin and ground.
VOUT=Output voltage to be set.
PIN 6: LBO
-
Open drain output of the battery
low detector, with 45Ω “ON resistance” at VIN=2V. It is pulled
low when the voltage on LBI pin
is below 1.22V.
6
AIC1631
AIC1631A (continued)
PIN 7: LBI
- The noninverting input of the
battery low detector, of which the
inverting input is internally connects to 1.22V voltage reference.
PIN 8: VOUT- The output voltage feedbacks to
the IC through this pin. If output
voltage was externally set, the
VOUT pin can be tied to any low
impedance node with voltage
between the external power
switch threshold and 7V
APPLICATION EXAMPLES
OSCON
100µF
C3
+
100µF
C2
VIN=3.3V
27K
R2
+
ILIM/SD
47µF
C1
+
VIN
LBI
SW
LBO
SGND
1N5819
D1
VOUT
Efficiency (%)
22Ω
R1
50µH L1
LOAD
90
+VIN
+VOUT
(+3V)
VIN=3.0V
85
VIN=2.5V
VIN=1.8V
VIN=2.2V
80
VIN=2.0V
CGND
AIC1631-3
75
0
100
200
400
300
500
600
Load Current (mA)
Fig. 1 3V Output Step-Up Converter
27K
R2
+
100µF
C2
+
47µF
C1
ILIM/SD
OSCON
100µF
C3
1N5819
D1
VOUT
VIN
LBI
SW
+
VIN=5.0V
VIN=4.5V
VIN=4.0V
90
LBO
SGND
Efficiency (%)
22Ω
R1
25µH L1
LOAD
95
+VIN
+VOUT
(+5V)
VIN=3.0V
85
VIN=2.2V
80
VIN=2.5V
VIN=2.0V
CGND
AIC1631-5
75
0
100
200
300
400
500
600
700
Load Current (mA)
Fig. 2 5V Output Step-Up Converter
7
AIC1631
APPLICATION EXAMPLES (CONTINUED)
80
+
VIN=1.6V
C1
10µF
47µF
L1
LOAD
VIN=1.4V
100Ω
R1
+VIN
ILIM/SD
VOUT
VIN
LBI
SW
1N5819
D1
+
100µF
C2
Efficiency (%)
+VOUT
(+3V)
LBO
SGND
75
VIN=1.2V
VIN=1.0V
70
CGND
AIC1631-3
65 0
2
4
6
8
10
12
Load Current (mA)
Fig. 3 1-Cell Input 3V Output Step-Up Converter
+VOUT
(+5V)
R1
100Ω
+VIN
80
ILIM/SD
10µF
C1
VIN=1.6V
VOUT
VIN
Efficiency (%)
+
47µH
L1
LBI
LOAD
SW
+
1N5819
D1
LBO
SGND
100µF
C2
CGND
AIC1631-5
75
VIN=1V
VIN=1.4V
VIN=1.2V
70
65 0
2
4
6
8
10
12
Load Current (mA)
Fig. 4 1-Cell Input 5V Output Step-Up Converter
2SB1424
Q1
27K
R2
+
100µF
C2
+
ILIM/SD
+
C1
220µF
1N5819
D1
C2
10µF
94
VOUT
VIN
LBI
SW
LBO
SGND
CGND
AIC1631-5
VIN=5V
90
R5
62K
R3
RB
12K
+
100µF
C4
20K
R4
VIN=4V
86
LOAD
Efficiency (%)
100Ω
R1
500µH
L1
+VOUT
(+5V)
15K
+VIN
82
VIN=3V
VIN=6V
78
74
VIN=7V
70
66
VIN=8V
62
58
0
50
100
150
200
250
300
350
400
Load Current (mA)
Fig. 5 4-Cell Input Step-Up / Step-Down Converter
8
AIC1631
APPLICATION EXAMPLES (CONTINUED)
+VIN
100Ω
R1
50µH
L1
LOAD
100µF
C1
C2
47µF
ILIM/SD
+
VOUT
VIN
LBI
SW
LBO
1M
R2
1N4148
1M
R3
15nF
1N5819
D1
+
VIN=2.0V
130
D2
SGND
Q1
2N3904
C4
CGND
AIC1631-5
+
C3
1µF
*CTL
* CTL= GND in Burst Mode
CTL=VIN in Normal Mode
680K
R4
Q2
2N3904
Total Supply Current (µA)
+VOUT
(+5V)
110
VIN=2.5V
VIN=1.8V
90
VIN=3V
70
50
30
10
0
10
20
30
40
Load Current (µA)
Fig. 6 Low Supply Current Burst Mode Step-Up Converter
+VOUT
+VIN
LOAD
OSCON
100µF
C3
50µH L1
22Ω
R1
+
100µF
C2
27K
R2
+
47µF
C1
ILIM/SD VOUT
VIN
LBI
SW
LBO
GND
+
1N5819
D1
R1
FB
AIC1631A
R2
Fig.7 Adjustable Output Voltage Step-Up Converter
9
AIC1631
PHYSICAL DIMENSION
8 LEAD PLASTIC SO (unit: mm)
D
H
E
e
MIN
MAX
A
1.35
1.75
A1
0.10
0.25
B
0.33
0.51
C
0.19
0.25
D
4.80
5.00
E
3.80
4.00
e
A
A1
C
B
SYMBOL
1.27(TYP)
H
5.80
6.20
L
0.40
1.27
SYMBOL
MIN
MAX
A1
0.381
—
A2
2.92
4.96
b
0.35
0.56
C
0.20
0.36
D
9.01
10.16
E
7.62
8.26
E1
6.09
7.12
L
8 LEAD PLASTIC DIP (unit: mm)
D
E1
E
A2
A1
C
L
eB
b
e
e
2.54 (TYP)
eB
—
10.92
L
2.92
3.81
10
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