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 AIC1652
MICROPOWER INVERTING DC/DC CONVERTER
SPEC NO: DS-1652-02 DEC 27, 00
n FEATURES
l l l l l l l
n DESCRIPTION
The AIC1652 is a high performance inverting DC/DC converter, designed to drive an external power switch to generate programmable negative voltages. In the particularly suitable LCD bias contrast application, efficiency of 87% can be achieved with low cost PNP bipolar transistor drivers. 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 80A and can be reduced to 0.7A in shutdown mode. Switching frequency being around 70KHz to 160KHz range, small size switching components are ideal for battery powered portable equipments, like notebook and palmtop computers.
2.4V to 7V Input Voltage Operation. Adjustable Output Voltage up to -40V. Low Quiescent Current at 80A. Pulse Frequency Modulation Maintains High Efficiency (87%). 70KHz to 160KHz Switching Frequency. Power-Saving Shutdown Mode (0.7A Typical). High Efficiency with Low Cost External PNP Bipolar Transistor.
n APPLICATIONS
l
Negative LCD Contrast Bias for 1. Notebook & Palmtop Computers. 2. Pen-Based Data System. 3. Portable Data Collection Terminals. 4. Personal Digital Assistants. Negative Voltage Supply.
l
n TYPICAL APPLICATION CIRCUIT
VIN 2.4V ~ 7V 100F + C1 VIN VREF CL DHI RB 470~1.8K 150 H *L 100F C2 + Q1 9012 D1 AIC1652 SHDN DLOW FB GND 1N5819 VOUT -12V~ -40V -10mA
0.047F C4
R2 100K
R1 1M C3 10nF * Sumida CD-54 Series VOUT = -1.22V x R1/R2
Negative LCD Contrast Bias Power Supply
n ORDERING INFORMATION
AIC1652 XX PACKAGE TYPE N: PLASTIC DIP S: SMALL OUTLINE TEMPERATURE RANGE C=0 C~+70 C ORDER NUMBER AIC1652CN (PLASTIC DIP) AIC1652CS (PLASTIC SO) PIN CONFIGURATION
TOP VIEW VIN VREF SHDN FB 1 2 3 4 8 7 6 5 CL DHI DLOW GND
ANALOG INTEGRATIONS CORPORATION
4F, 9 Industry E. 9th Road, Science-based IndustrialPark , Hsinchu, Taiwan, R.O.C.
www.analog.com.tw
TEL: (8863)577-2500 FAX:(8863)577-2510
1
AIC1652
MICROPOWER INVERTING DC/DC CONVERTER
SPEC NO: DS-1652-02 DEC 27, 00
n ABSOLUTE MAXIMUM RATINGS
Supply Voltage ..................................................................... ... ... ... ... ... ... ............ 7V
SHDN Voltage
.................................................. ... ... ... ... ..................................... 7V ................................... ... ... .......................... 0C~70C
.................................... ... ... ... ................. -65C~ 150C
Operation Temperature Range Storage Temperature Range
n TEST CIRCUIT
Refer to Typical Application Circuit.
n ELECTRICAL CHARACTERISTICS (V
PARAMETER
Input Voltage Switch Off Current VREF Voltage VREF Source Current DLOW "ON Resistance" DHI "ON Resistance" CL Threshold Shutdown Threshold Shutdown Mode Current VFB=-50mV ISOURCE = 250A
IN=5V,
Ta=25C, unless otherwise specified.) TYP. MAX.
7 80 150 1.28
TEST CONDITIONS
MIN.
2.4
UNIT
V A V A
1.16 250
1.22
5 7 70 0.8 1.5 0.7 2.4 2
mV V A
VSHDN = 0V
ANALOG INTEGRATIONS CORPORATION
4F, 9 Industry E. 9th Road, Science-based IndustrialPark , Hsinchu, Taiwan, R.O.C.
www.analog.com.tw
TEL: (8863)577-2500 FAX:(8863)577-2510
2
AIC1652
MICROPOWER INVERTING DC/DC CONVERTER
SPEC NO: DS-1652-02 DEC 27, 00
n TYPICAL PERFORMANCE CHARACTERISTICS
V REF Source Current vs VIN
350 300
1.5
Shutdown Current vs VIN
250 200
Shutdown Current (A)
Source Current (A)
1
150 100
0.5
50
0
2
3
4
5
6
7
8
01
2
3
4
5
6
7
8
VIN (V)
VIN (V)
Frequency vs VIN Voltage
150
100
Duty Cycle vs VIN Voltage
Frequency (KHz)
130
95
110
Duty Cycle (%)
Ta=0 C Ta=25C
90
Ta=0 C
90
Ta=70 C
85
Ta=25 C
70
Ta=70 C
50
80
2 3 4
VIN (V)
5
6
7
2
3
4
5
6
7
VIN (V)
n BLOCK DIAGRAM
VIN 1 CURRENT LIMIT COMPARATOR + PFM OSCILLATOR 1.22V REFERENCE VOLTAGE + V IN 70mV 8 CL
V IN LATCH 7 DHI
VREF
2
SHDN
3
OUTPUT DRIVER
6 DLOW 5
FB
4
-
GND
ERROR COMPARATOR
ANALOG INTEGRATIONS CORPORATION
4F, 9 Industry E. 9th Road, Science-based IndustrialPark , Hsinchu, Taiwan, R.O.C.
www.analog.com.tw
TEL: (8863)577-2500 FAX:(8863)577-2510
3
AIC1652
MICROPOWER INVERTING DC/DC CONVERTER
SPEC NO: DS-1652-02 DEC 27, 00
n PIN DESCRIPTIONS
PIN 1: VIN - 2.4V to 7V input supply voltage. 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: PIN 6: DLOW - Driver sinking output. Connected to DHI when using an external Pchannel MOSFET. When using an external PNP bipolar transistor, connect a resistor RB from this pin to DHI. RB value depends on VIN, inductor and PNP bipolar transistor. By adjusting the RB value, efficiency can be optimized. PIN 7: DHI - Driver sourcing output. Connect to gate of the external P-channel MOSFET or base of the PNP bipolar transistor. - Current-limit input. This pin clamps the switch peak current to prevent over-current damage to the external switch.
SHDN - Logic input to shutdown the chip. >1.5V = normal operation, GND = shutdown In shutdown mode DLOW and DHI pins are at high level.
- Feedback signal input to sense ground. Connecting a resistor R1 to VOUT and a resistor R2 to VREF pin yields the output voltage: VOUT = -(R1/R2 ) x VREF
PIN 4: FB
PIN 8: CL
PIN 5: GND - Power ground.
n APPLICATION INFORMATIONS
0.8
Max. Output Power vs VIN
Typical Application Circuit 100H
Max. Output Power (W)
0.6
120H 150H
0.4
180H 220H Inductor Value
The typical application circuit generates an adjustable negative voltage for contrast bias of LCD displays. Efficiency and output power can be optimized by using appropriate inductor and switch. The following formulas provide a guideline for determining the optimal component values: V IN L = (11.1 - 0.15 x V IN ) x IOUT x V OUT PNP :
V CEO > V IN + V OUT IC,MAX 200 x IOUT VIN
IOUT V IN
0.2
0
2
4
6
8
V CE < 0. 4 V at I C = 200 x
VIN (V)
and = 10 RB 3 x L x (V IN - 0.8) where, units: VIN & VOUT in V, IOUT in A, L in H, RB in
ANALOG INTEGRATIONS CORPORATION
4F, 9 Industry E. 9th Road, Science-based IndustrialPark , Hsinchu, Taiwan, R.O.C.
www.analog.com.tw
TEL: (8863)577-2500 FAX:(8863)577-2510
4
AIC1652
MICROPOWER INVERTING DC/DC CONVERTER
SPEC NO: DS-1652-02 DEC 27, 00
n APPLICATION EXAMPLES
90
Efficiency vs Load Current
VOUT = -15V L =150H
90
Efficiency vs VIN
VOUT =-15V IOUT =-10mA L=220 H
85
VIN=5V VIN=3V
VIN =7V
88
Efficiency (%)
Efficiency (%)
86
80
84
L=150 H
75
82
L=100H
70 0 5 10 15 20 25 30
80 2 3 4 5 6 7 8
Load Current (mA)
VIN (V)
Efficiency vs VIN
VOUT =-22V IOUT =-10mA L=220 H
86
Efficiency vs Load Current
90
90
VOUT =-22V L =120H
85
88
VIN=7V
Efficiency (%)
Efficiency (%)
VIN=5V VIN=3V
80
L=150H
84
75
82
L=100H
70 0 5 10 15 20 25 30
80 2 3 4 5 6 7 8
Load Current (mA)
VIN (V)
90
Efficiency vs Load Current
VOUT = -30V L =100 H
90
Efficiency vs V IN
VOUT =-30V IOUT =-10mA L=150H L=120H
VIN=7V
88
85
Efficiency (%)
Efficiency (%)
VIN=5V
80
86
VIN=3V
84
75
82
L=100 H
70 0 5 10 15 20 25 30
80
2
3
4
5
6
7
8
Load Current (mA)
VIN (V)
ANALOG INTEGRATIONS CORPORATION
4F, 9 Industry E. 9th Road, Science-based IndustrialPark , Hsinchu, Taiwan, R.O.C.
www.analog.com.tw
TEL: (8863)577-2500 FAX:(8863)577-2510
5
AIC1652
MICROPOWER INVERTING DC/DC CONVERTER
SPEC NO: DS-1652-02 DEC 27, 00
n PHYSICAL DIMENSIONS
l 8 LEAD PLASTIC SO (unit: mm)
D
SYMBOL A A1
H E
MIN 1.35 0.10 0.33 0.19 4.80 3.80
MAX 1.75 0.25 0.51 0.25 5.00 4.00 1.27(TYP) 6.20 1.27
B C D E e
e A C A1
H L
L
5.80 0.40
B
l
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 E1
C
A2 A1
L
e eB L UNIT: mm
2.54 (TYP)
eB b e
ANALOG INTEGRATIONS CORPORATION
4F, 9 Industry E. 9th Road, Science-based IndustrialPark , Hsinchu, Taiwan, R.O.C.
www.analog.com.tw
TEL: (8863)577-2500 FAX:(8863)577-2510
6


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