AIC1633
2-Cell, 200mA, Step-Up DC/DC Converter
FEATURES
High Efficiency Up To 87%. Adjustable Output Voltage with Two Resistors (AIC1633A) Power-Saving Shutdown Mode (7µA typical). Internal 0.8A Switch. 120KHz Switching Rate. Adjustable Switch Current Limit. On-Chip Low Battery Detector.
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 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
Pocket Organizers. Electronic Dictionaries. Cameras. Pagers. Bar-Code Scanners. LCD Displays. Battery Backup Supplies. Portable Instruments.
Logic-controlled shutdown mode is provided for 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
+VIN 470Ω R1 100µH L
+
NORMAL 10K 22µF C1 SD RILIM ILIM/SD VIN SW VOUT LBI LBO CGND
+VOUT (3.3V) +
LOAD
1N5819 D1
22µF C2 TATAN
SGND NOTE: VIN≥1.8V, VOUT≤7V
AIC1633
High-Efficiency Step-Up DC/DC Converter
Analog Integrations Corporation DS-1633-03 Mar 15, 00
4F, 9, Industry E. 9th Rd, Science Based Industrial Park, Hsinchu Taiwan, ROC TEL: 886-3-5772500 FAX: 886-3-5772510
www.analog.com.tw
1
AIC1633
ORDERING INFORMATION
AIC1633 XXX P ACKAGE 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 ORDER NUMBER AIC1633CN AIC1633-3CN AIC1633-5CN (PLASTIC DIP ) AIC1633CS AIC1633-3CS AIC1633-5CS (PLASTIC SO) AIC1633ACN (PLASTIC DIP ) AIC1633ACS (PLASTIC SO) PIN CONFIGURATION
TOP VIEW ILIM/SD 1 VIN 2 SW 3 SGND 4 8 7 6 5 VOUT LBI LBO CGND
TOP VIEW ILIM/SD 1 VIN 2 SW 3 GND 4 8 7 6 5 VOUT LBI LBO FB
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
PARAMETER
Input Voltage Output Voltage ILOAD =70mA AIC1633 AIC1633-3 AIC1633-5 Switch off Current No Load Current Shutdown Mode Current Shutdown Recovery Time
(VIN=3.0V, Ta=25°C, unless otherwise specified.)
TEST CONDITIONS
MIN.
1.8 3.16 2.88 4.80
TYP.
MAX.
7
UNIT
V
3.3 3 5 105
3.44 3.12 5.20 140
V
µA µA
AIC1633/AIC1633-3 AIC1633-5
160 250 7 15
µA
VIN=2.5V, ILOAD =70mA
1.8
mS
2
AIC1633
ELECTRICAL CHARACTERISTICS
PARAMETER
Efficiency
(CONTINUED) MIN. TYP.
87 86 0.6 0.6 0.5 0.6 0.5 90 1.17 120 1.22 0.617 1.75 1.25 45 1 10 10 150 1.27 0.636
TEST CONDITIONS
ILOAD =70mA AIC1633/AIC1633-3 AIC1633-5
MAX.
UNIT
%
Line Regulation
ILOAD =40mA AIC1633, VIN =2.0~3.3V AIC1633-3, VIN =2.0~3.0V AIC1633-5, VIN =2.2~4.5V %VOUT
Load Regulation
ILOAD =170mA AIC1633/AIC1633-3 AIC1633-5 %VOUT KHz V V
Ω Ω µA
Oscillator Frequency LBI Pin Trip Point FB Threshold Voltage SW “ON Resistance” LBO “ON Resistance” SW Off Leakage Input Pin Bias Current Output Pin Leakage AIC1633A AIC1633/AIC1633-3 AIC1633-5 VIN=2V
0.598
nA/Pin nA/Pin
TYPICAL PERFORMANCE CHARACTERISTICS
Switch Voltage vs Current
3 2.5 2 2
SW ON Resistance vs Temperature
AIC1633/AIC1633-3 AIC1633-5
1.8
1.5 1 0.5
SW RDS ON (Ω)
AIC1633/AIC1633-3
VSW (V)
1.6
1.4
1.2
AIC1633-5
Ta = 25°C
0 0 0.5 1 1.5 2 2.5 1 0 10 20 30 40 50 60 70 80
ISW (A)
Temperature (°C)
3
AIC1633
TYPICAL PERFORMANCE CHARACTERISTICS (CONTINUED)
No Load Supply Current vs Input Voltage
280 260 240 300
No Load Supply Current vs Temperature
VIN=3V
260
Ta = 25°C
AIC1633/AIC1633-3 AIC1633-5 IS (µ A)
220
IS (µA)
220 200 180 160 140
180
AIC1633/AIC1633-3
140
AIC1633-5
1
1.5
2
2.5
3
3.5
4
4.5
5
100 0 10 20 30 40 50 60 70 80
VIN ( V)
Temperature (°C)
Shutdown Mode Supply Current vs Input Voltage
8.2 8 7.8 9.4
Shutdown Mode Supply Current vs Temperature
VIN=3V
Ta = 25°C
9 8.6
IS (µA)
7.6 7.4
IS (µA)
8.2 7.8 7.4
7.2 7
1
1.5
2
2.5
3
3.5
4
4.5
5
7
0
20
40
60
80
VIN ( V)
Temperature (°C)
Oscillator Frequency vs Input Voltage
130
Oscillator Frequency vs Temperature
123
Ta = 25°C
120
VIN=3V
122
Frequency (KHz)
110 100 90 80 70 60
Frequency (KHz)
121 120 119 118 117
1
1.5
2
2.5
3
3.5
4
4.5
5
0
10
20
30
40
50
60
70
80
VIN ( V)
Temperature (°C)
4
AIC1633
TYPICAL PERFORMANCE CHARACTERISTICS (CONTINUED)
Maximum Load Current vs Switch Current Limit Resistance
300 250 200 350 300 250 200 150 100
Maximum Load Current vs Switch Current Limit Resistance
VIN=1.8V VIN=2.0V VIN=2.2V VIN=2.5V VIN=3V VIN=3.3V AIC1633-5 Ta=25°C 5% VOUT Drop
AIC1633/AIC1633-3 Ta=25°C 5% VOUT Drop
IL (mA)
150
VIN=3V VIN=1.8V VIN=2.0V VIN=2.2V VIN=2.5V
600
100 50 0
IL (mA)
50 0 0 20 40 60 80 100 120
0
100
200
300
400
500
RILIM (KΩ)
RILIM (KΩ)
BLOCK DIAGRAM
ILIM/SD Current Limit
+ 0.617V
VOUT
VIN 100mV SW A
+ Shutdown
+ OSC 1.22V
LBI
LBO
SGND
CGND
5
AIC1633
PIN DESCRIPTIONS
AIC1633-30/ AIC1633-33 / AIC1633-50
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.
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 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 PIN 3: SW - Input supply. - Drain of the power switch, to be connected to inductor/ diode. - 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:
PIN 4: GND - Ground. PIN 5: FB
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 - The non-inverting 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
+VOUT (+3V)
95
+VIN 470Ω R1
90
Efficiency (%)
VIN=3.0V
85
LOAD
L1 82µH
+
ILIM/SD 22µF C1 VIN SW
VOUT LBI LBO CGND
80
VIN=2.2V VIN=2.0V
75 70
+ C2 22µF
SGND 1N5819 D1
VIN=1.8V
AIC1633-3
65 0
30
60
90
120
150
Load Current (mA)
Fig. 1
3V Output Step-Up Converter
+VOUT (+5V) +VIN 470Ω R1 + LOAD L1 82µH 22µF C1
95 90
Efficiency (%)
ILIM/SD VIN SW SGND
VOUT LBI LBO CGND
85
VIN=4.5V VIN=2.2V VIN=3.0V
80 75 70 65
VIN=1.8V
+ 22µF C2
1N5819 D1
AIC1633-5
0
20
40
Load Current (mA)
60
80
100
120
140
160
Fig. 2
5V Output Step-Up Converter
7
AIC1633
APPLICATION EXAMPLES
(CONTINUED)
+VOUT (+3V)
+VIN
470Ω R1
85
VIN=1.6V
80
LOAD
+ 1N5819 D1 L1 100µH 10µF C1
Efficiency (%)
ILIM/SD VIN SW SGND
VOUT LBI LBO CGND
VIN=1.4V VIN=1.0V VIN=0.8V VIN=1.2V
75
70
65
+ 22µF C2 AIC1633-3
60 0
5
10
15
20
25
30
35
Load Current (mA)
Start-Up VIN Voltage = 1.4V
Fig. 3
1-Cell Input 3V Output Step-Up Converter
2SB1424 Q1 +VIN 470Ω R1 150µH L1 + C2 10µF 15K 10K RILIM ILIM/SD VIN SW + C1 22µF SGND 1N5819 D1 VOUT LBI LBO CGND 20K R4 10µF R5 R2 3.3K R3 62K
90
+VOUT (+5V)
85
VIN=5V VIN=6V VIN=3V VIN=3.5V VIN=4.5V VIN=4V
Efficiency (%)
+
80
C4
75
LOAD
70 0
VIN=7V
20 40 60 80 100 120 140 160 180 200 220 240
AIC1633-5
Load Current (mA)
Fig. 4
+VIN 1K R1 1K R2 10µF + C2 + 10µF C1 1K R3 2SB1424 Q1 1N5819 D1 82µH L1
4-Cell Input Step-Up/ Step-Down Converter
+VOUT (+3V) 33K R4 +
100
VIN=3V
95
ILIM/SD VIN SW SGND
VOUT LBI LBO CGND
Efficiency (%)
90
VIN=4V VIN=5V
22µF C3 24K R5
85
LOAD
80
VIN=7V VIN=6V
0 20 40 60 80 100 120 140 160 180 200 220
AIC1633-3
75
VOUT Ripple May Be Large at V IN=3V Condition
Load Current ( mA)
Fig. 5 3-Cell Input 3V Output Step-Down Converter
8
AIC1633
APPLICATION EXAMPLES
L1 50µH +VIN 0.1µF C2 + 100µF C1 Q2 IRFZ34 D1 MBR360 Q1 9014 D3 Q3 1N4148 9014 SGND CGND
0
(CONTINUED)
100Ω 1N4148 R4 VOUT (+5V)
100
80
Efficiency (%)
1N4148 D4 R1 4.3K
100K R3 10K R2 ZD1 5.1V Q4 9014 + C3 10µF
D5
60
VIN=8V VIN=12V VIN=16V VIN=20V
ILIM\SD VOUT VIN SW LBI LBO
+
220µF C4
40
20
D2
1N4148
AIC1633-5
0.005
0.05
Load Current (mA)
0.5
5
Fig. 6 Boost-Driven 5V Output Step-Down Converter
+VOUT
+VIN 470Ω R1 82µH L1 +
ILIM/SD VOUT 22µF C1 VIN SW GND LBI LBO FB R2 R1
LOAD
22µF C2
+ 1N5819 D1
AIC1631A
Fig.7
Adjustable Output Voltage Step-Up Converter
9
AIC1633
PHYSICAL DIMENSION
8 LEAD PLASTIC SO (unit: mm)
D
SYMBOL A
H E
MIN 1.35 0.10 0.33 0.19 4.80 3.80 5.80 0.40
MAX 1.75 0.25 0.51 0.25 5.00 4.00 6.20 1.27
A1 B C D E
e A C
A1
e H L
L
1.27(TYP)
B
8 LEAD PLASTIC DIP
D
(unit: mm)
SYMBOL A1 A2 b C
E
MIN 0.381 2.92 0.35 0.20 9.01 7.62 6.09 — 2.92
MAX — 4.96 0.56 0.36 10.16 8.26 7.12 10.92 3.81
E1
D E
C
A2 A1
L
E1 e eB L
2.54 (TYP)
eB b e
10
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