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參數(shù)資料
| 型號(hào)： | SC1462ISK.TRT |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHED CAPACITOR CONVERTER, 200 kHz SWITCHING FREQ-MAX, PDSO6 |
| 封裝： | SOT-23, 6 PIN |
| 文件頁數(shù)： | 6/10頁 |
| 文件大?。?/td> | 228K |
| 代理商： | SC1462ISK.TRT |
5
2005 Semtech Corp.
www.semtech.com
POWER MANAGEMENT
SC1462
Pin Conguration
Applications Information
Theory of Operation
The SC1462 utilizes a switched capacitor charge pump to
generate an output voltage approximately 2×V
IN.
An internal oscillator generates two out of phase xed fre-
quency clock signals which turn on and off internal MOS-
FET switches. During phase 1, the ying charge pump
capacitor is charged to V
IN through switches S1 and S2.
During phase 2, the ying charge pump capacitor is con-
nected in series with the input voltage via S3 and S4, pro-
ducing an output voltage.
Short Circuit/Soft-Start
An internal current limit and soft-start circuit provides pro-
tection against output short circuit and limits large cur-
rent spikes generated during the initial start-up to charge
output capacitor.
If V
OUT is less than VIN - 200mV, then all switches are turned
off and V
OUT is charged with a 200mA current source from
V
IN. When VOUT reaches VIN - 200mV, the current source is
disconnected from output and the charge pump circuitry
is enabled again.
Output Current
The dropout voltage for a charge pump doubler is dened
as (2×V
IN) - VOUT. The maximum output current is usually
specied as that which will not cause the dropout voltage
to exceed the requirements of the application. The calcu-
lation of the dropout voltage is given in the capacitor se-
lection section on Page 6. Typical dropout voltages versus
I
OUT are graphed on Page 8.
Thermal Shutdown
The thermal shutdown circuit provides added protection
to the SC1462. During a V
OUT short circuit condition or if
the load is excessive, the over-temperature circuitry will
shut down the charge pump if the junction temperature
exceeds approximately 140°C. The charge pump is en-
abled only if the junction temperature drops to approxi-
mately 120°C. The SC1462 will cycle in and out of ther-
mal shut down until the short circuit or the excessive load
condition on V
OUT is removed, thereby improving device re-
liability. The junction temperature can be calculated from
the following formula if the ambient temperature (T
A) and
the charge pump power dissipation (P
DISS) are known.
T
J = TA + PDISS × θJA
; θ
JA = 230 °C/W
ON
S1,S2
OFF
Charge transfer from CIN to CBUCKET
ON
S3,S4
OFF
Charge transfer from:
CIN and CBUCKET to COUT (Doubler)
VOUT = 2 x VIN
Doubler
S4
12
VIN
CBUCKET
S1
12
S3
12
COUT
Cin
S2
12
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