AIC AIC1633-5CS

AIC1633
2-Cell, 200mA, Step-Up DC/DC Converter
FEATURES
High Efficiency Up To 87%.
Adjustable Output Voltage with Two Resistors
(AIC1633A)
DESCRIPTION
The AIC1633 is a high efficiency step up DC/DC
converter. Only four external components are
required to deliver a fixed voltage of 3V, 3.3V, or
Power-Saving Shutdown Mode (7µA typical).
Internal 0.8A Switch.
120KHz Switching Rate.
Adjustable Switch Current Limit.
On-Chip Low Battery Detector.
5V. The output voltage can be externally set to
an arbitrary value below breakdown voltage of
the power switch for AIC1633A. Efficiency
beyond 83% can be easily achieved at 70mA
load with 2.2V to 3V input voltages.
APPLICATIONS
Logic-controlled shutdown mode is provided for
Pocket Organizers.
Electronic Dictionaries.
Cameras.
Pagers.
Bar-Code Scanners.
LCD Displays.
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 47µH to 150µH inductance are
recommended for most applications.
TYPICAL APPLICATION CIRCUIT
470Ω
+VIN
1N5819
D1
+VOUT (3.3V)
R1
100µH
L
NORMAL
10K
+
22µF
C1
SD
+
LOAD
22µF
C2
TATAN
RILIM
ILIM/SD
VOUT
VIN
LBI
SW
LBO
SGND
NOTE: VIN≥1.8V, VOUT≤7V
CGND
AIC1633
High-Efficiency Step-Up DC/DC Converter
Analog Integrations Corporation
4F, 9, Industry E. 9th Rd, Science Based Industrial Park, Hsinchu Taiwan, ROC
DS-1633-03 Mar 15, 00
TEL: 886-3-5772500
FAX: 886-3-5772510
www.analog.com.tw
1
AIC1633
ORDERING INFORMATION
AIC1633 XXX
PIN CONFIGURATION
ORDER NUMBER
AIC1633CN
AIC1633-3CN
AIC1633-5CN
(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
AIC1633CS
AIC1633-3CS
AIC1633-5CS
(PLASTIC SO)
AIC1633ACN
(PLASTIC DIP )
8
VIN 2
7
LBI
SW 3
6
LBO
SGND 4
5
CGND
ILIM/SD 1
8
VOUT
VIN 2
7
LBI
SW 3
6
LBO
GND 4
5
FB
TOP VIEW
AIC1633ACS
(PLASTIC SO)
VOUT
ILIM/SD 1
ABSOLUTE MAXIMUM RATINGS
Supply Voltage .........................................................……………………....................... 7.0V
Operating Temperature Range ...................................……….……................. -20°C ~ 80°C
Storage Temperature Range .........................................……..……….......
TEST CIRCUIT
ELECTRICAL CHARACTERISTICS
-65°C ~ 150°C
Refer to Typical Application Circuit.
PARAMETER
(VIN=3.0V, Ta=25°°C, unless otherwise specified.)
TEST CONDITIONS
Input Voltage
Output Voltage
MAX.
UNIT
7
V
V
ILOAD =70mA
AIC1633
3.16
3.3
3.44
AIC1633-3
2.88
3
3.12
AIC1633-5
4.80
5
5.20
105
140
AIC1633/AIC1633-3
160
AIC1633-5
250
7
Shutdown Mode Current
Shutdown Recovery Time
TYP.
1.8
Switch off Current
No Load Current
MIN.
VIN=2.5V, ILOAD =70mA
1.8
µA
µA
15
µA
mS
2
AIC1633
ELECTRICAL CHARACTERISTICS
PARAMETER
(CONTINUED)
TEST CONDITIONS
MIN.
MAX.
UNIT
ILOAD =70mA
Efficiency
AIC1633/AIC1633-3
87
AIC1633-5
86
%
ILOAD =40mA
Line Regulation
AIC1633, VIN =2.0~3.3V
0.6
AIC1633-3, VIN =2.0~3.0V
0.6
AIC1633-5, VIN =2.2~4.5V
0.5
%VOUT
ILOAD =170mA
Load Regulation
AIC1633/AIC1633-3
0.6
AIC1633-5
0.5
Oscillator Frequency
LBI Pin Trip Point
FB Threshold Voltage
AIC1633A
SW “ON Resistance”
AIC1633/AIC1633-3
AIC1633-5
%VOUT
90
120
150
KHz
1.17
1.22
1.27
V
0.598
0.617
0.636
V
1.75
Ω
1.25
VIN=2V
LBO “ON Resistance”
Ω
45
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
SW ON Resistance vs Temperature
2
3
2.5
1.8
AIC1633/AIC1633-3
SW RDS ON (Ω)
AIC1633-5
2
VSW (V)
TYP.
1.5
1
AIC1633/AIC1633-3
1.6
1.4
AIC1633-5
1.2
0.5
Ta = 25°C
0
0
0.5
1
1.5
ISW (A)
2
2.5
1
0
10
20
30
40
50
60
70
80
Temperature (°C)
3
AIC1633
TYPICAL PERFORMANCE CHARACTERISTICS (CONTINUED)
No Load Supply Current vs Input Voltage
No Load Supply Current vs Temperature
300
280
VIN=3V
Ta = 25°C
260
260
AIC1633/AIC1633-3
220
IS (µA)
IS (µA)
240
AIC1633-5
200
180
AIC1633/AIC1633-3
220
180
AIC1633-5
140
160
140
1
1.5
2
2.5
3
3.5
4
4.5
100
5
0
40
50
60
70
Shutdown Mode Supply Current vs Temperature
80
9.4
9
7.8
8.6
IS (µA)
IS (µA)
30
Shutdown Mode Supply Current vs Input Voltage
8
7.6
7.8
7.2
7.4
1
1.5
2
2.5
3
3.5
4
4.5
7
5
VIN=3V
8.2
7.4
0
20
40
60
80
VIN (V)
Temperature (°C)
Oscillator Frequency vs Input Voltage
Oscillator Frequency vs Temperature
130
123
Ta = 25°C
VIN=3V
120
Frequency (KHz)
122
110
100
90
80
121
120
119
118
70
60
20
Temperature (°C)
Ta = 25°C
7
10
VIN (V)
8.2
Frequency (KHz)
1
1.5
2
2.5
3
VIN (V)
3.5
4
4.5
5
117
0
10
20
30
40
50
60
70
80
Temperature (°C)
4
AIC1633
TYPICAL PERFORMANCE CHARACTERISTICS (CONTINUED)
Maximum Load Current vs
Switch Current Limit Resistance
300
AIC1633/AIC1633-3
Ta=25°C
5% VOUT Drop
250
Maximum Load Current vs
Switch Current Limit Resistance
350
VIN=1.8V
300
250
IL (mA)
IL (mA)
200
VIN=3V
150
VIN=1.8V
100
0
VIN=2.2V
0
100
200
VIN=2.2V
200
VIN=2.5V
150
VIN=3V
VIN=3.3V
100
VIN=2.0V
50
300
VIN=2.5V
400
500
50
600
0
0
20
40
RILIM (KΩ)
AIC1633-5
Ta=25°C
5% VOUT Drop
VIN=2.0V
60
80
100
120
RILIM (KΩ)
BLOCK DIAGRAM
ILIM/SD
-
Current Limit
VOUT
+
VIN
100mV
SW
0.617V
+
LBI
-
Shutdown
+
A
1.22V
LBO
OSC
SGND
CGND
5
AIC1633
PIN DESCRIPTIONS
AIC1633-30/ AIC1633-33 / AIC1633-50
AIC1633A
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,
the current limit resistor limits
supply capability of the
AIC1633.
(See
typical
performance characteristics).
The ILIM/SD pin should be
shorted to VIN pin if limiting
on switch peak current is not
intended.
2. The
AIC1633
goes
in
shutdown
mode
and
consumes less than 10µA
when ILIM/SD pin is pulled to
ground.
PIN 2: VIN
- 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 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.
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.
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,
the current limit resistor limits
supply capability of the
AIC1633A.
(See
typical
performance characteristics).
The ILIM/SD pin should be
shorted to VIN pin if limiting
on switch peak current is not
intended.
2. The AIC1633A goes in
shutdown
mode
and
consumes less than 10µA
when ILIM/SD pin is pulled to
ground.
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.
VOUT voltage is given by the
following equation:
R1 VOUT
=
−1
R2 0.617
where R1 = Resistor connected
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
AIC1633
AIC1633A (continued)
PIN 7: LBI
APPLICATION EXAMPLES
95
+VOUT
(+3V)
+VIN
L1
82µH
LOAD
ILIM/SD
+
22µF
C1
VIN
LBI
SW
LBO
CGND
SGND
+
1N5819
D1
C2
22µF
VOUT
Efficiency (%)
90
470Ω
R1
30
60
90
120
150
95
470Ω
R1
90
ILIM/SD
+
L1
82µH
22µF
C1
LBI
LBO
SGND
CGND
AIC1633-5
1N5819
D1
85
VIN=3.0V
VIN=2.2V
80
VIN=1.8V
75
70
65
Fig. 2
VIN=4.5V
VOUT
VIN
SW
22µF
C2
VIN=1.8V
3V Output Step-Up Converter
+VIN
+
VIN=2.0V
75
Load Current (mA)
+VOUT
LOAD
VIN=2.2V
80
65
0
AIC1633-3
Fig. 1
(+5V)
VIN=3.0V
85
70
Efficiency (%)
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
- The non-inverting input of the
battery low detector, of which the
inverting
input
is
internally
connects
to
1.22V
voltage
reference.
0
20
40
60
80
100
Load Current (mA)
120
140
160
5V Output Step-Up Converter
7
AIC1633
APPLICATION EXAMPLES
+VOUT
470Ω
R1
+VIN
(+3V)
(CONTINUED)
85
VIN=1.6V
80
10µF
C1
L1
100µH
VIN
LBI
SW
LBO
Efficiency (%)
1N5819
D1
VOUT
ILIM/SD
+
LOAD
CGND
SGND
VIN=1.4V
VIN=1.0V
75
VIN=1.2V
VIN=0.8V
70
65
+
AIC1633-3
22µF
C2
60 0
5
10
15
20
25
30
35
Load Current (mA)
Start-Up VIN Voltage = 1.4V
1-Cell Input 3V Output Step-Up Converter
2SB1424
Q1
15K
+VIN
10K
RILIM
470Ω
R1
R5
C2
10µF
VIN
LBI
SW
LBO
1N5819
D1
10µF +
C2
+
10µF
C1
20K
R4
1N5819
D1
VIN=4.5V
VIN=3V
VIN=3.5V
VIN=4V
75
LOAD
VIN=7V
20
40
60
80
100 120 140
160 180 200 220 240
Load Current (mA)
4-Cell Input Step-Up/ Step-Down Converter
82µH
L1
+VOUT
(+3V)
100
VIN=3V
95
1K
R3
ILIM/SD
VOUT
VIN
LBI
SW
LBO
SGND
CGND
AIC1633-3
VOUT Ripple May Be Large at V IN=3V Condition
33K
R4
+
22µF
C3
24K
R5
LOAD
Efficiency (%)
1K
R2
10µF
VIN=6V
80
AIC1633-5
2SB1424
Q1
1K
R1
C4
VIN=5V
85
70
0
Fig. 4
+VIN
R3
62K
+
CGND
SGND
C1
22µF
R2
3.3K
VOUT
ILIM/SD
+
150µH
L1
+
90
+VOUT
(+5V)
Efficiency (%)
Fig. 3
VIN=4V
90
VIN=5V
85
VIN=7V
80
75
VIN=6V
0
20
40
60
80
100
120
140
160
180
200
220
Load Current (mA)
Fig. 5 3-Cell Input 3V Output Step-Down Converter
8
AIC1633
APPLICATION EXAMPLES (CONTINUED)
L1
50µH
100µF C1
Q1
9014
IRFZ34
ZD1
5.1V
D3
D1
MBR360
D2
10K
R2
R1
4.3K
Q2
+
100K
R3
1N4148
D4
Q3
R4
VOUT
(+5V)
D5
Q4
9014
+
ILIM\SD VOUT
C3
10µF
VIN
LBI
SW
LBO
+
220µF
C4
VIN=8V
VIN=12V
VIN=16V
VIN=20V
80
Efficiency (%)
1N4148
0.1µF
C2
100
100Ω
+VIN
60
40
20
9014
1N4148
SGND
CGND
0
AIC1633-5
1N4148
0.005
0.05
0.5
Load Current (mA)
5
Fig. 6 Boost-Driven 5V Output Step-Down Converter
+VOUT
+VIN
470Ω
R1
22µF
C2
Fig.7
82µH L1
LOAD
+
ILIM/SD VOUT
22µF
C1
VIN
LBI
SW
LBO
GND
+
1N5819
D1
R1
FB
AIC1631A
R2
Adjustable Output Voltage Step-Up Converter
9
AIC1633
PHYSICAL DIMENSION
8 LEAD PLASTIC SO (unit: mm)
D
SYMBOL
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
H
E
e
e
A
C
A1
B
H
5.80
6.20
L
0.40
1.27
L
8 LEAD PLASTIC DIP
(unit: mm)
D
E1
E
A2
A1
C
L
eB
b
1.27(TYP)
e
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
e
2.54 (TYP)
eB
—
10.92
L
2.92
3.81
10