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LM2780 데이터시트(PDF) 6 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
부품명 LM2780
상세설명  Ultra-Low Ripple Switched Capacitor Voltage Inverter
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제조업체  NSC [National Semiconductor (TI)]
홈페이지  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM2780 데이터시트(HTML) 6 Page - National Semiconductor (TI)

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Operation Description (Continued)
OUTPUT RESISTANCE
Output resistance (R
OUT) models the internal non-idealities
of a charge pump that result in droop in the output voltage.
The effect of output resistance on output voltage is ex-
pressed in the following equation:
V
OUT =-[VIN -(|IOUT|xROUT )]
Output resistance is a function of the internal switch resis-
tance (R
SW)
, flying capacitance (C1), flying capacitor
equivalent series resistance (ESR
C1), output capacitor ESR
(ESR
Cout), and internal switching frequency (fSW). When the
LM2780 operates as a single charge pump (C2 removed),
the output resistance can be approximated by the following
equation:
1 Fly Cap: R
OUT1
~=2R
SW1+[1/(fSW*C1)]+4ESRC1+ESRCout
R
SW1 is the sum of the ON resistance of the four internal
MOSFET switches of Charge Pump 1.
With both C1 and C2 in place, the double pumping topology
of the LM2780 cuts the output resistance in half:
2 Fly Caps: R
OUT2
~= 0.5xR
OUT1
Recommendations for minimizing output resistance include
increasing flying capacitance and minimizing output and fly-
ing capacitor ESR.
CAPACITOR SELECTION
Surface-mount multi-layer ceramic capacitors are recom-
mended for use with the LM2780. These capacitors are
small, inexpensive and have very low equivalent series re-
sistance (ESR, < 15m
Ω typ.). Tantalum capacitors, OS-CON
capacitors, and aluminum electrolytic capacitors generally
are not recommended for use with the LM2780 due to their
high ESR, as compared to ceramic capacitors.
For most applications, ceramic capacitors with X7R or X5R
temperature characteristic are preferred for use with the
LM2780. These capacitors have tight capacitance tolerance
(as good as ±10%), hold their value over temperature (X7R:
±15% over -55˚C to 125˚C; X5R: ±15% over -55˚C to 85˚C),
and typically have little voltage coefficient.
Capacitors with Y5V and/or Z5U temperature characteristic
are generally not recommended for use with the LM2780.
These types of capacitors typically have wide capacitance
tolerance (+80%, -20%), vary significantly over temperature
(Y5V: +22%, -82% over -30˚C to +85˚C range; Z5U: +22%,
-56% over +10˚C to +85˚C range), and have poor voltage
coefficients. Under some conditions, a nominal 1µF Y5V or
Z5U capacitor could have a capacitance of only 0.1µF. Such
deviation would severely affect performance of the LM2780
circuit.
www.national.com
6


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