an8049sh Panasonic Corporation of North America, an8049sh Datasheet - Page 11

• Manufacturer Part Number: an8049sh
• Description: 1.8-volt 3-channel Step-up, Step-down, And Polarity Inverting Dc-dc Converter Control Ic
• Manufacturer: Panasonic Corporation of North America

I Usage Notes
[1] Allowable power dissipation
[2] Allowable V
biased by V
output is shorted.
ripple filter in the V
as close to the IC as possible.
may differ depending on the actual system of the power supply circuit. Also note that this allowable range is a design
target, and is not guaranteed by testing of all samples.
1. Since the power dissipation (P) in this IC increases proportionally with the supply voltage, applications must be careful
2. If the IC is shorted to ground, shorted to V
to operate so that the loss does not exceed the allowable power dissipation, P
components will be destroyed.
V
The figure shows the allowable range for V
Note that the allowable range shown here is the result of testing the IC independently, and that the allowable range
CC
Reference formula:
P = (V
ripple due to the switching transistor being turned on and off can cause this IC's U.V.L.O. circuit, which is
< P
CC
V
I
Du
V
I
Du
V
I
Du
I
SO(OUT)1
SO(OUT)2
OUT3
CC
D
BEQ1
BEQ2
O(SAT)3
, to operate incorrectly, and can cause the S.C.P. capacitor charging operation to fail to start when the
CC
1
2
3
CC
−V
ripple
CC
BEQ1
: The voltage between the base and emitter of the channel 1 npn transistor
: The OUT1 pin output source current
: The output 1 on-duty
: The voltage between the base and emitter of the channel 2 npn transistor
: The OUT2 pin output source current
: The output 2 on-duty
: The OUT3 pin saturation voltage (0.5 V maximum when I
: The OUT3 pin current (This will be {V
: The output 3 on-duty
: The V
(This is set by the resistor connected to the RB1 pin. When R
maximum.)
(This is set by the resistor connected to the RB2 pin. When R
maximum.)
line or by inserting a capacitor between the IC GND and V
) × I
100k
10M
10k
1M
CC
0
SO(OUT)1
pin current
1
× Du
Allowable range
when V
V
1
2
CC
+ (V
ripple voltage V
Allowable V
CC
CC
is 3 V.
CC
CC
3
ripple. Applications should reduce V
SDH00012BEB
− V
, or inserted incorrectly, either the device itself or peripheral
Allowable range
when V
BEQ2
4
CC
CC
CC
) × I
is 10 V.
(AC) (V[p-p])
ripple
CC
5
SO(OUT)2
− V
BEQ3
6
× Du
− V
D
7
, for the package. See the P
2
O(SAT)3
+ V
OUT3
CC
B
B
O(SAT)3
is 1 kΩ, I
is 1 kΩ, I
8
}/R
pins and locating that capacitor
is 40 mA.)
CC
O3
× I
ripple either by inserting a
.)
OUT3
SO(OUT)1
SO(OUT)2
× Du
AN8049SH
will be 34 mA,
will be 34 mA,
D
3
+ V
 T
CC
a
curve.
× I
11
CC