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SS6578CSTR Datasheet

  • SS6578CSTR

  • HIGH EFFICIENCY STEP DOWN DC/DC CONTROLLER

  • 11頁

  • ETC

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SS6578
High-Efficiency, Step-Down DC/DC Controller
FEATURES
4V to 18V input voltage operation.
High-efficiency (up to 95%).
Low quiescent current at 90碌A(chǔ).
Pulse-skipping and pulse-frequency modulation.
Inputs-uncommitted current-sense comparator.
Duty-cycle adjustable.
90KHz to 280KHz oscillator frequency.
Power-saving shutdown mode (8碌A(chǔ) typical).
Push-pull driver output.
DESCRIPTION
The SS6578 is a high performance
step-down DC/DC controller, designed to drive
an external P-channel MOSFET to generate
programmable
output
voltages.
Two
main
schemes of Pulse-Skipping and Pulse-Frequency
Modulation are employed to maintain low
quiescent current and high conversion efficiency
under wide ranges of input voltage and loading
condition. The SS6578 delivers 10mA to 2A
of output current with 87%~93% efficiency at
APPLICATIONS
鈥?/div>
Notebook 5V/3.3V Main Power
鈥?/div>
Step-Down DC/DC Controller Modules.
鈥?/div>
Constant-Current Source for Battery Chargers.
V
IN
=9V, V
OUT
=5V condition. A current-sense
comparator with both inverting and non-inverting
inputs uncommitted is included to provide the
crucial function of either current-limit protection
or constant-output current control. When the
SS6578 is used in a high-side current-sensing
step-down constant-current source, the efficiency
is typically greater than 90%. Duty-cycle can be
adjusted to greater than 90% by connecting a
resistor from DUTY pin to V
IN
. Quiescent current
is about 90碌A(chǔ) and can be reduced to 8碌A(chǔ) in
shutdown mode. The switching frequency range
of around 90 kHz to 280 kHz allows small size
switching components, which are ideal for battery
powered portable equipment.
ORDERING INFORMATION
SS6578CXXX
Packing
TR: Tape and reel
TB: Tubes
Packaging
S: SO-8
N: PDIP-8
PIN CONFIGURATION
SO-8
VIN
DUTY
SHDN
FB
TOP VIEW
1
2
3
4
8 CS+
7 CS-
6 DRI
5 GND
Example: SS6578CSTR
脿
in SO-8 package, shipped in tape and reel packing
(PDIP-8 is only available in tubes)
Rev.2.02 4/06/2004
www.SiliconStandard.com
1 of 11

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