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ADP5600ACPZ-R7 数据表(PDF) 14 Page - Analog Devices

部件名 ADP5600ACPZ-R7
功能描述  Interleaved Inverting Charge Pump with Negative LDO Regulator
PDF  25 Pages
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制造商  AD [Analog Devices]
网页  http://www.analog.com
标志 AD - Analog Devices

ADP5600ACPZ-R7 数据表(HTML) 14 Page - Analog Devices

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ADP5600
Data Sheet
Rev. 0 | Page 14 of 25
THEORY OF OPERATION
Figure 40. Functional Block Diagram
The ADP5600 is unique among inverting regulators in that it has
two charge pump blocks that operate in an interleaving manner.
Interleaved operation gives greatly reduced input and output
voltage ripple without sacrificing efficiency, output resistance, or
ease of use compared to inductor-based solutions. An LDO
regulates the output voltage and filters out low frequency spurious
signals.
INVERTING CHARGE PUMP OPERATION
The basic voltage conversion task is achieved using a switched
capacitor technique with two external charge storage capacitors.
An internal oscillator and switching network transfer charge
between the two charge storage capacitors. The basic principle
of the voltage inversion scheme is illustrated in Figure 41.
Figure 41. Basic Inverting Charge Pump
GND
EN
SYNC
FREQ
RT
C1+
C1–
C2+
C2–
CPOUT
LDO_IN
LDO_OUT
FB
SEL1
FLOAT
GND
SEL2
FLOAT
GND
ON
OFF
VIN
UVLO
CP
SOFT START
INVERTING
CHARGE PUMP 1
INVERTING
CHARGE PUMP 2
ISEL
PGTH_CP
LDO
SOFT START
ENTH
PGTH
CHARGE
CONTROL
STARTUP
AND
PROTECTION
FREQUENCY
CONTROL
REFERENCE
AND
THRESHOLD
GENERATOR
STARTUP
TSD
fSYNC
VFREQ
VFREQ
FNG2
FNG1
FNO1
FNO2
CPG1
CPG2
CPH1
ENTH
1M
Ω
400
Ω
+
–
+
+
–
–
LEVEL
SHIFTER
fOSC
ADP5600
ISEL
ISEL
PGTH
VIN
PGOOD
SEL1
GND
NC
GND
NC
SEL2
GND
GND
NC
NC
VREF
–0.5V
–1.5V
–2.5V
–5.0V
CSS
1µA
LDO
EN_LDO
VREF
×1
×1
CURRENT SENSE
÷2
NC = NO CONNECTION (FLOATING)
NOISE
FILTER
+
COUT
OUT = –VIN
VIN
+
CIN
S3
S4
S1
S2
C+
C–
OSCILLATOR
Ф1
Ф2
+
CFLY



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