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AIC1650CS Datasheet(PDF) 4 Page - Analog Intergrations Corporation

Part # AIC1650CS
Description  3-Cell, High-Efficiency, Inverting DC/DC Converter
PDF  6 Pages
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Manufacturer  AIC [Analog Intergrations Corporation]
Direct Link  http://www.analog.com.tw
Logo AIC - Analog Intergrations Corporation

AIC1650CS Datasheet(HTML) 4 Page - Analog Intergrations Corporation

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AIC1650
4
PIN DESCRIPTIONS
PIN 1: VIN
- 4V to 20V input supply voltage.
PIN 2: VREF - 1.22V reference output. Bypass
with a 0.047
µF capacitor to GND.
Sourcing capability is guaran-
teed to be greater than 250
µA.
PIN 3: SHDN- Logic input to shutdown the chip.
>1.5V = normal operation,
GND = shutdown
In shutdown mode DLOW and
DHI pins are at high level.
PIN 4: FB
- Feedback signal input to sense
ground. Connecting a resistor
R1 to VOUT and a resistor R2 to
VREF pin yields the output volt-
age:
VOUT = -(R1/R2 ) x VREF
PIN 5: GND - Power ground.
PIN 6: DLOW - Driver sinking output. Connected
to DHI when using an external
P-channel MOSFET. When us-
ing 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 ad-
justing 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 bi-
polar transistor.
PIN 8: CL
- Current-limit
input.
This
pin
clamps the switch peak current
to prevent over-current damage
to the external switch.
APPLICATION INFORMATIONS
46
8
10
12
1416
18
20
VIN (V)
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
Max. Output Power vs VIN
Typical Application Circuit
Inductor Value
100
µH
270
µH
120
µH
150
µH
180
µH
220
µH
300
µH
330
µH
The typical application circuit generates an adjustable
negative voltage for contrast bias of LCD displays.
Efficiency and output power can be optimized by us-
ing appropriate inductor and switch. The following
formulas provide a guideline for determining the op-
timal component values:
L=
(11.1 0.15
V )
V
I
V
IN
IN
OUT
OUT
−×
×
×
PNP :
V
V
V
CEO
IN
OUT
>+
I
200
I
V
C,MAX
OUT
IN
≥×
V
0.4V at I
= 200
I
V
CE
C
OUT
IN
<×
and
10
β =
RB
≅ 3 x L x (VIN - 0.8)
where, units: VIN & VOUT in V, IOUT in A, L in
µH,
RB in
Ω



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