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AIC1631
2-Cell, 500mA, Step-Up DC/DC Converter
FEATURES
High Efficiency 90%. Adjustable Output Voltage with Two Resistors (AIC1631A) Power-Saving Shutdown Mode (7A typical). Internal 2A Switch. 120KHz Switching Rate. Adjustable Switch Current Limit. On-Chip Low Battery Detector.
DESCRIPTION
The AIC1631 is a high efficiency step up DCDC 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 AIC1631A. Efficiency beyond 87% can be easily achieved at 100mA load with 2.2V to 3V input voltages.
APPLICATIONS
Palmtop & Notebook Computers. Pocket Organizers. Cameras. Pagers. 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 25H to 50H inductance are commended for most applications. re-
TYPICAL APPLICATION CIRCUIT
100 +VIN L 1N5819 D1 +VOUT (3.3V) + C2 100F Note: VIN1.8V, VOUT7V R1 50H
+
NORMAL C1 100F
RILIM ILIM/SD VIN SW SGND VOUT LBI LBO CGND
SD
LOAD
AIC1631
High Efficiency Step-Up DC/DC Converter
Analog Integrations Corporation DS-1631-04 Dec 27, 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
AIC1631
ORDERING INFORMATION
AIC1631 XXX PACKAGE TYPE N: PLASTIC DIP S: SMALL OUTLINE TEMPERATURE RANGE C=0C~+70C OUTPUT VOLTAGE DEFAULT: 3.3V 3: 3.0V 5: 5.0V A: Adjustable ORDER NUMBER AIC1631CN AIC1631-3CN AIC1631-5CN (PLASTIC DIP) AIC1631CS AIC1631-3CS AIC1631-5CS (PLASTIC SO) AIC1631ACN (PLASTIC DIP) AIC1631ACS (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 EXT 3 GND 4 8 7 6 5 VOUT LBI LBO FB
ABSOLUTE MAXIMUM RATINGS
Supply Voltage ......................................................................................................... 7.0V Operating Temperature Range..................................................................... -20C ~ 80C Storage Temperature Range ................................................................... -65C ~ 150C
TEST CIRCUIT
Refer to Typical Application Circuit.
ELECTRICAL CHARACTERISTICS
PARAMETER
Input Voltage Output Voltage
(VIN=3.0V, Ta=25C, unless otherwise specified.)
TEST CONDITIONS
Fig. 4 in Appl. Examples ILOAD =200mA AIC1631 AIC1631-3 AIC1631-5
MIN.
1.5 3.16 2.88 4.80
TYP.
MAX.
7
UNIT
V V
3.3 3 5 105
3.44 3.12 5.20 140
Switch off Current No Load Current Shutdown Mode Current Shutdown Recovery Time VIN=2.5V, ILOAD =200mA AIC1631/AIC1631-3 AIC1631-5
A A
160 180 7 0.4 15
A
mS
2
AIC1631
ELECTRICAL CHARACTERISTICS (CONTINUED)
PARAMETER
Efficiency
TEST CONDITIONS
ILOAD =200mA AIC1631/AIC1631-3 AIC1631-5 ILOAD =100mA AIC1631, VIN=1.8 ~ 3.3V AIC1631-3, VIN=1.8 ~ 3V AIC1631-5, VIN=2.2 ~ 3.3V ILOAD =10~300mA AIC1631/AIC1631-3 AIC1631-5
MIN.
TYP.
87 90 0.6 0.5 0.8 0.3 0.8
MAX.
UNIT
%
Line Regulation
%VOUT
Load Regulation
%VOUT
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 AIC1631A AIC1631/AIC1631-3 AIC1631-5 VIN=2V
90 1.17 0.598
120 1.22 0.617 0.5 0.4 45
150 1.27 0.636
KHz V V

1 10 10
A
nA/Pin nA/Pin
TYPICAL PERFORMANCE CHARACTERISTICS
1
Switch Voltage vs. Current Ta=25C AIC1631/1631-3
0.58 .0.54
SW ON Resistance vs. Temperature AIC1631/1631-3 AIC1631-5
0.46
0.75
SW RDS ()
VSW (V)
AIC1631-5
0.5
0.5
0.25
0.42
0.38
0
0
0.5
1
1.5
2
2.5
3
0.36
0
20
40
60
80
ISW (A)
Temperature (C)
3
AIC1631
TYPICAL PERFORMANCE CHARACTERISTICS
200 190 180
(CONTINUED)
No Load Supply Current vs. Input Voltage Ta=25C
210 200 190
No Load Supply Current vs. Temperature
IS (A)
170 160
AIC1631-5
IS (A)
AIC1631-5
180 170
AIC1631/1631-3
150 140
160 150
AIC1631/1631-3
0 20 40 60 80
1
1.5
2.0
2.5
VIN (V)
3.0
3.5
4.0
4.5
5.0
Temperature (C)
Shutdown Mode Supply Current vs. Input Voltage
8.2 8.0 7.8
9.4
Shutdown Mode Supply Current vs. Temperature
Ta=25C
9.0 6.6
VIN=3V
IS (A)
IS (A)
1 1.5 2 2.5 3 3.5 4 4.5 5
7.6 7.4 7.2 7.0
8.2 7.8 7.4
VIN (V)
7.0 0
20
40
60
80
Temperature (C)
Oscillator Frequency vs. Input Voltage
130
Oscillator Frequency vs. Temperature
123
110
Oscillator Frequency (KHz)
Frequency (KHz)
121
Ta=25C
90
VIN=3V
119
70 60
1
2
3
4
5
VIN (V)
117 0
20
40
60
80
Temperature (C)
4
AIC1631
TYPICAL PERFORMANCE CHARACTERISTICS
Maximum Load Current vs. Switch Current Limit Resistance Maximum Load Current (mA)
(CONTINUED)
Maximum Load Current vs. Switch Current Limit Resistance Maximum Load Current (mA)
600 500 400
600 500 400 300 200 100 0
AIC1631/1631-3 Ta=25C (5% VOUT Drop)
AIC1631/1631-3 Ta=25C (5% VOUT Drop) VIN=2.7V
VIN=2.2V VIN=2.5V VIN=2.0V VIN=1.8V
200 400 600 800 1000
300
VIN=2.2V
200 100 0
VIN=2.5V VIN=2.0V
0 50 100
VIN=1.8V
150 200
0
RILIM (K)
RILIM (K)
BLOCK DIAGRAM
ILIM/SD Current Limit
+ 0.617V
VOUT
VIN 100mV SW A
+ Shutdown OSC
+ 1.22V
LBI
LBO
SGND
CGND
5
AIC1631
PIN DESCRIPTIONS
AIC1631/ AIC1631-3 / AIC1631-5
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. 2. The AIC1631 goes in shutdown mode and consumes less than 10A 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. Ground connected to source of power switch. Ground for control circuits of the IC. It should be separated from SGND to avoid the interference. Open drain output of the battery low detector, with 45 "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. The output voltage feedbacks to the IC through this pin.
AIC1631A
PIN 1: ILIM/SD1. 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. 2. The AIC1631A goes in shutdown mode and consumes less than 10A when ILIM/SD pin is pulled to ground. PIN 2: VIN PIN 3: SW PIN 4: GND PIN 5: FB Input supply. Drain of the power switch, to be connected to inductor/ diode. Ground. 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:SGND PIN 5:CGND -
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 45 "ON resistance" at VIN=2V. It is pulled low when the voltage on LBI pin is below 1.22V.
PIN 6:LBO
-
PIN 7:LBI
-
PIN 8:VOUT -
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
+VOUT (+3V) +VIN 22 R1 50H L1 + 100F C2 + 47F C1 27K R2 ILIM/SD VIN SW OSCON 100F C3 + 1N5819 D1 SGND VOUT LBI LBO CGND
75 0 100 200
300
90
VIN=3.3V Efficiency (%)
85
VIN=3.0V VIN=2.5V VIN=1.8V
LOAD
80
VIN=2.2V VIN=2.0V
400 500 600
AIC1631-3
Load Current (mA)
Fig. 1 3V Output Step-Up Converter
+VOUT (+5V)
+VIN 22 R1
25H L1
95
27K R2 + 47F C1 ILIM/SD VIN SW VOUT LBI LBO CGND
90
+ 100F C2
LOAD
Efficiency (%)
VIN=5.0V VIN=4.5V VIN=4.0V VIN=3.0V VIN=2.2V VIN=2.5V
85
+ OSCON 100F C3 1N5819 D1
80
VIN=2.0V
SGND
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)
+VOUT (+3V)
80
+VIN
100 R1
VIN=1.4V VIN=1.6V Efficiency (%)
ILIM/SD VIN SW VOUT LBI LBO CGND
65 0 75
+
LOAD
47F L1
C1 10F
VIN=1.2V
70
VIN=1.0V
100F C2
+
1N5819 D1
SGND
AIC1631-3
2
4
6
8
10
12
Load Current (mA)
Fig. 3 1-Cell Input 3V Output Step-Up Converter
+VOUT (+5V)
+VIN
R1 100
80
VIN SW
LBI LBO CGND
Efficiency (%)
47H L1
LOAD
+
10F C1
ILIM/SD
VOUT
75
VIN=1.6V VIN=1V VIN=1.4V VIN=1.2V
70
+
1N5819 D1 100F C2
SGND
AIC1631-5
65 0
2
4
6
8
10
12
Load Current (mA)
Fig. 4 1-Cell Input 5V Output Step-Up Converter
2SB1424 Q1 +VIN 100 R1 500H L1 + C1 220F + 27K R2 ILIM/SD VOUT LBI LBO CGND 20K R4 15K R5
+VOUT (+5V)
94 90
VIN=5V VIN=4V VIN=6V VIN=3V VIN=7V VIN=8V
0 50 100 150 200 250 300 350 400
C2 10F
VIN SW SGND
+ 100F C4
LOAD
Efficiency (%)
RB 12K
62K R3
86 82 78 74 70 66 62 58
+ 100F C2
1N5819 D1
AIC1631-5
Load Current (mA)
Fig. 5 4-Cell Input Step-Up / Step-Down Converter
8
AIC1631
APPLICATION EXAMPLES (CONTINUED)
+VIN +VOUT (+5V)
LOAD 100 R1
130
50H L1 C2 47F 1N5819 D1
Total Supply Current (A)
D2 +
ILIM/SD VIN SW SGND VOUT LBI LBO CGND 1N4148
VIN=2.0V VIN=1.8V VIN=2.5V VIN=3V
1M R2 15nF C4
1M R3
680K R4
Q1 2N3904
110 90 70
50
100F C1
+
AIC1631-5
* CTL= GND in Burst Mode CTL=VIN in Normal Mode
*CTL
+ C3 1F
Q2 2N3904
30 10
0
10
20
30
40
Load Current (A)
Fig. 6 Low Supply Current Burst Mode Step-Up Converter
+VOUT
+VIN 22 R1 50H L1 + 27K R2 + 47F C1
ILIM/SD VOUT VIN SW GND LBI LBO FB R2 R1
LOAD
100F C2
OSCON 100F C3
+ 1N5819 D1
AIC1631A
Fig.7 Adjustable Output Voltage Step-Up Converter
9
AIC1631
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 (unit: mm)
D
SYMBOL A1
E1
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
A2 b C
E
D E
C
A2 A1
L
E1 e eB L
2.54 (TYP)
eB b e
10

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