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SC632A Datasheet(PDF) 10 Page - Semtech Corporation

Part No. SC632A
Description  1MHz Fixed 5.0V Output Charge Pump Regulator
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Maker  SEMTECH [Semtech Corporation]
Homepage  http://www.semtech.com
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SC632A Datasheet(HTML) 10 Page - Semtech Corporation

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SC632A
0
General Description
The SC632A is a 5.0V output charge pump regulator
designed to support up to 300mA (T
A ≤ 80°C, 3.5V ≤ VIN
4.2V) and 275mA (T
A ≤ 85°C, 3.5V ≤ VIN ≤ 5.5V) of continu-
ous current for powering 5.0V devices in portable
handheld equipment including Compact Flash and CF+
products.
The SC632A has three operating modes — x, .5x, and
2x. The x mode is a linear series regulation mode with a
low open-loop output resistance of only 250mW. The x
mode functions as a low-noise series linear regulator. The
.5x and 2x modes are a low noise, constant frequency,
constant duty cycle switch mode, using two bucket
capacitors. One bucket supports the full output current
while the other bucket charges from the input. The two
buckets exchange roles in the next phase, supplying con-
tinuous output current in both phases and reducing the
need for a large output decoupling capacitor. The constant
frequency, constant duty cycle operation also produces
predictable constant frequency harmonics.
Mode Transition Hysteresis
Hysteresis is provided to prevent chatter between charge
pump modes for input steps of up to 20mV. Decouple
the input to prevent steps greater than 20mV, for
optimum transient performance, when the input voltage
reaches the mode transition thresholds.
Thermal Resistance
The SC632A package is thermally efficient when the circuit
board layout connects the thermal pad through multiple
vias to the ground plane. The thermal resistance rating is
dependent upon the connection between the thermal
pad and the ground plane. A layout that is done correctly
should keep the junction temperature below the over-
temperature limit while operating the SC632A within the
specified electrical conditions. A poor layout may allow
the junction temperature to reach the over temperature
limit, so it is important to maintain adequate ground plane
around the device to maximize heat transfer to the PCB.
Temperature Derating
The V
IN supply range and ambient temperature range of
the application should be compared with the following
derating curve to determine the maximum safe continu-
ous load current. The DC operating points beneath each
curve are in the safe operating temperature range of the
MLP package.
150
200
250
300
350
400
450
35
45
55
65
75
85
95
105
Ambient Temp (°C)
Derating for VIN < 4.2V
Derating for VIN < 5.5V
Maximum Continuous Output
Protection Circuitry
The SC632A also provides protection circuitry that pre-
vents the device from operating in an unspecified state.
These functions include:
Over-Current Protection (OCP)
Short-Circuit Current Protection (SCCP)
Over-Temperature Protection (OTP)
Over-Current Protection
Over-current protection is provided to limit the output
current. When V
OUT is greater than 2V, OCP limits the
output to A typical. The threshold at 2V allows the
device to recover from excessive voltage droop during an
over current.
Applications Information


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