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AIC1628
3-Cell, High-Efficiency, Step-Up DC/DC Converter
FEATURES
4V to 24V Input Voltage Operation. Adjustable Output Voltage. Low Quiescent Current at 100A. Pulse-Skipping and Pulse-Frequency Modulation Maintain High Efficiency (max. 95%). 90KHz to 250KHz Oscillator Frequency. Power-Saving Shutdown Mode (8A Typical). Push-Pull Driver Output.
DESCRIPTION
The AIC1628 is a high performance step-up DC/DC converter, designed to drive an external power switch to generate programmable positive voltages. In the particularly suitable LCD contrast bias and flash memory programming power supply applications, typical full-load efficiencies are 85% to 95%. 4V to 24V input operation range allows the AIC1628 to be powered directly by the battery pack in the most batteryoperated applications for greater efficiency. Output voltage can be scaled to 40V or greater by two external resistors. A Pulse-Frequency Modulation scheme is employed to maintain high efficiency conversion under wide input voltage range. Quiescent current is about 100A and can be reduced to 8A in shutdown mode. Switching frequency being around 90KHz to 250KHz range, small size switching components are ideal for battery powered portable equipments, like notebook and palmtop computers.
APPLICATIONS
Flash Memory Programming Power Supply. Positive LCD Contrast Bias for Notebook & Palmtop Computers. Step-Up DC/DC Converter Module. Telecom Power Supply.
TYPICAL APPLICATION CIRCUIT
+5V ~ 24V VIN *Fuse 60m VIN 0.047F C2 VREF SHDN FB CL DHI DLOW GND AIC1628 R2 16.5K 0.033F C3 R1 470K 0.01F C4 *Buss Fuse MCR-2A **Sumida CDR105 **L1 68H 1N5819 D1 Q1 2SK940 C5 220F +36V VOUT + C1 120F
95
VIN=13V Efficiency (%) VIN=9V
90
VIN=18V
VIN=5V
85
5V
+
C6 0.1F
>50mA
VOUT=36V
80 0 50 100 150 200
Load Current (mA)
Color LCD Contrast Bias Supply
Efficiency vs. Output Current
Analog Integrations Corporation DS-1628-00
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
AIC1628
ORDERING INFORMATION
AIC1628 XX PACKAGE TYPE N: PLASTIC DIP S: SMALL OUTLINE TEMPERATURE RANGE C=0C~+70C ORDER NUMBER AIC1628CN (PLASTIC DIP) PIN CONFIGURATION
TOP VIEW VIN 1 VREF 2 8 7 6 5 CL DHI DLOW GND
AIC1628CS (PLASTIC SO)
SHDN 3 FB 4
ABSOLUTE MAXIMUM RATINGS
VIN Supply Voltage (VIN Pin)
........................................................................................ 24V
SHDN Pin Voltage
........................................................................................................15V ............................................................................ 0C~70C ........................................................................ -65C~ 150C
Operating Temperature Range Storage Temperature Range
TEST CIRCUIT
Refer to Typical Application Circuit
ELECTRICAL CHARACTERISTICS (VIN= 13V, Ta=25C, unless otherwise
specified.)
PARAMETERS TEST CONDITIONS MIN. TYP. MAX. UNIT
Input Voltage Quiescent Current Shutdown Mode Current VREF Voltage VREF Source Current DLOW "ON Resistance" DHI "ON Resistance" CL Threshold Shutdown Threshold Shutdown Input Leakage Current V SHDN < 15V VIN - VCL VFB = 1.5V V SHDN = 0V ISOURCE = 250A
4 100 8 1.16 250 15 10 45 0.8 60 1.5 1.22
24 200 20 1.28
V
A A
V
A
75 2.4 1
mV V
A
2
AIC1628
TYPICAL PERFORMANCE CHARACTERISTICS
Frequency vs VIN Voltage
100
280
Duty Cycle vs VIN Voltage
Ta= 25C Ta= 0C
90
Frequency (KHz)
Duty Cycle (%)
230
80 70 60 50 40
180
Ta= 70C
Ta= 0C
Ta= 70C
130
Ta= 25C
80
4
9
14
19
24
30
4
9
14
19
24
VIN (V)
VIN (V)
110
Quiescent Current vs VIN Voltage Ta= 25C
Current Limit Threshold vs Temperature
75
Quiescent Current (A)
100
70
VIN = 5V
Ta= 0C
90 80 70 60
CL Threshold (mV)
65
Ta= 70C
60
VIN = 20V VIN = 13V
55
50
4
9
14
19
24
0
20
40
60
80
VIN (V)
Temperature (C)
1.3
Reference Voltage vs Temperature
Reference Voltage (V)
VIN = 5V
1.25
1.2
1.15
1.1
0
20
40
60
80
Temperature (C)
3
AIC1628
BLOCK DIAGRAM
1 CURRENT LIMIT COMPARATOR + VIN 60mV 8 CL
VIN
VREF 2 PFM OSCILLATOR 1.22V REFERENCE VOLTAGE LATCH VIN 7 DHI OUTPUT DRIVER
SHDN
3
6
DLOW
FB
4
+ -
5 ERROR COMPARATOR
GND
PIN DESCRIPTIONS
PIN 1: VIN - 4V to 24V input supply voltage. PIN 5: GND - Power ground. PIN 6: DLOW -Driver sinking output. Connected to gate of the external N-channel MOSFET or base of the NPN bipolar transistor. PIN 7: DHI - Driver sourcing output. Connected to DLOW when using an external Nchannel MOSFET. When using an external NPN bipolar transistor, connect a base resistance RB from this pin to DLOW. RB value depends on VIN, inductor and NPN current gain. - Current-limit input. Threshold voltage is 60mV from VIN. This pin clamps the switch peak current to prevent over-current damage to the external switch, under abnormal conditions. PIN 2: VREF - 1.22V reference output. Bypass with a 0.047F capacitor to GND. Sourcing capability is guaranteed to be greater than 250A. PIN 3: SHDN - Logical input to shutdown the chip. >1.5V = normal operation, GND = Shutdown, Can not be floating or forced greater than 15V. In shutdown mode DLOW and DHI pins are at low level. PIN 4: FBFeedback signal input to sense VREF. Connecting a resistance R1 to VOUT and a resistance R2 to GND yields the output voltage: VOUT = (R1+R2)/R2 x VREF (Refer to typical application circuit)
PIN 8: CL
4
AIC1628
APPLICATION EXAMPLES
VIN *Fuse 60m **L1 47H D1 2SK940 Q1 * ** 1N5819 VOUT 300F + C3 +12V >150mA + C1 +5V ~ 11V 120F
100
Efficiency vs Load Current
0.047F
VIN VREF SHDN FB AIC1628
CL DHI DLOW GND
VIN=11V
Efficiency (%)
95
C2
VIN=9V VIN=7V
90
VIN=5V
R2 11.3K
R1 100K
Buss Fuse MCR-2A Sumida RCH108
85
0
50
100
150
200
250
300
350
Load Current (mA)
Fig. 1
Flash memory programming supply
5V + C2 33F VIN 0.047F C3 VREF SHDN FB CL DHI DLOW GND *L1 47H D1 1N5819 + C1 150F
Battery Powered +2V~ 5V
Efficiency vs Load Current
90
VIN=4V VIN=3V
Efficiency(%)
85
VOUT 2SK940 Q1 + C4 180F +12V >50mA
VIN=2V
80
AIC1628
R2 20K
R1 470K *Sumida RCH108
75
0
50
100
150
Load Current (mA)
Fig. 2 2-cells to +12V Flash memory programmer
C1 VIN 0.047F C2 VREF SHDN FB AIC1628 CL DHI DLOW GND *L1 150H D1 Q1 2SC4672 RB 910
+
VIN +4V~ 6V 150F
90
Efficiency vs Load Current
Efficiency(%)
VIN=5V
95
VIN=6V
VIN=4V
1N5819 + C3 220F C4 0.1F VOUT +30V
80
R2 17.5K C6 0.033F
R1 500K C5 0.1F *Sumida CD54
75 0 10 20 30 40 50
Load Current (mA)
Fig. 3 4-cells to +30V power supply
5
AIC1628
APPLICATION EXAMPLES (CONTINUED)
L1 R4 100K Q1 2N2907 47F + C1 + 1F C3 220H Sumida CDR105 1N5819 85 D1 VOUT +5V 100mA 0.1F C6 1N3906 Q2 2SK940 20K R3 20K
Efficiency vs Load Current
-48V to +5V
80
+
C2 300F 0.1F
R5 72K
Efficiency(%)
C5
75
VIN VREF
CL DHI DLOW GND AIC1628
70
ZD1
12V 0.047F C4
SHDN FB
65
VIN -48V
60 0
50
100
150
Load Current (mA)
Fig. 4 Telecom +5V supply
D3 47F C5 + VIN VREF SHDN C2 0.04F FB AIC1628 R2 20K R1 34K CL DHI DLOW GND
D2
1N5819
1N5819
C1
+ 100F
VIN +5V
95
Efficiency vs Load Current
+ 1F 2SK1463 Q1 33H D1 1N5820 *L1 C3 330F VOUT +3.3V 2A
90
Efficiency(%)
+
C4
85
80
75 10 *MPP Core 100 1000
Load Current (mA)
Fig. 5
5V to 3.3V step-down converter
6
AIC1628
PHYSICAL DIMENSIONS
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
7

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