MCP1252.PDF

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MCP1252/3
Low Noise, Positive-Regulated Charge Pump
Features
Description
• Inductorless, Buck/Boost, DC/DC Converter
• Low Power: 80 µA (Typical)
• High Output Voltage Accuracy:
- ±2.5% (V OUT Fixed)
• 120 mA Output Current
• Wide Operating Temperature Range:
- -40°C to +85°C
• Thermal Shutdown and Short-Circuit Protection
• Uses Small Ceramic Capacitors
• Switching Frequency:
- MCP1252: 650 kHz
- MCP1253: 1 MHz
• Low Power Shutdown Mode: 0.1 µA (Typical)
• Shutdown Input Compatible with 1.8V Logic
•V IN Range: 2.0V to 5.5V
• Selectable Output Voltage (3.3V or 5.0V) or
Adjustable Output Voltage
• Space-saving, 8-Lead MSOP
• Soft-Start Circuitry to Minimize In-Rush Current
The MCP1252/3 are inductorless, positive-regulated
charge pump DC/DC converters. The devices generate
a regulated fixed (3.3V or 5.0V) or adjustable output
voltage. They are specifically designed for applications
requiring low noise and high efficiency and are able to
deliver up to 120 mA output current. The devices allow
the input voltage to be lower or higher than the output
voltage, by automatically switching between buck/
boost operation.
The MCP1252 has a switching frequency of 650 kHz,
avoiding interference with sensitive IF bands. The
MCP1253 has a switching frequency of 1 MHz and
allows the use of smaller capacitors than the
MCP1252, thus saving board space and cost.
Both devices feature a power-good output that can be
used to detect out-of-regulation conditions. Extremely
low supply current and low external parts count (three
capacitors) make these devices ideal for small, battery-
powered applications. A shutdown mode is also pro-
vided for further power reduction. The MCP1252 and
MCP1253 feature thermal and short-circuit protection
and are offered in space-saving, 8-lead, MSOP
packages.
Applications
• White LED Backlighting
• Color Display Bias
• Local 3V-to-5V Conversions
• Flash Memory Supply Voltage
• SIM Interface Supply for GSM Phones
• Smart Card Readers
• PCMCIA Local 5V Supplies
Package Types
MSOP (FIXED)
PGOOD
V OUT
V IN
GND
1
8
SELECT
2
MCP1252
MCP1253
7
SHDN
3
6
C+
4
5
C-
MSOP (ADJUSTABLE)
PGOOD
1
8
FB
V OUT
V IN
GND
2
MCP1252
MCP1253
7
SHDN
3
6
C+
4
5
C-
2002 Microchip Technology Inc.
DS21752A-page 1
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MCP1252/3
Functional Block Diagram
MCP1252-33X50
PGOOD
140 k
Ω
SELE CT
173 k
Ω
84 mV
+
100 k
Ω
1.21V
+
200 mV
+
V OUT
SHD N
C+
Switch
Control
C-
V IN
GND
MCP1252-ADJ
PGOOD
FB
84 mV
+
1.21V
+
200 mV
+
V OUT
SHD N
Switch
Control
C+
C-
V IN
GND
DS21752A-page 2
2002 Microchip Technology Inc.
MCP1253-33X50
MCP1253-ADJ
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MCP1252/3
1.0 ELECTRICAL
CHARACTERISTICS
PIN FUNCTION TABLE
Name
Function
Absolute Maximum Ratings †
PGOOD
Open-Drain Power GOOD Output
Power Supply Voltage, V IN ...............................................6.0V
Voltage on Any Pin w.r.t. GND ............... -0.3V to (V IN + 0.3V)
Output Short Circuit Duration ................................continuous
Storage Temperature Range.........................-65°C to +150°C
Ambient Temperature with Power Applied ....-55°C to +125°C
Junction Temperature ................................................. +150°C
ESD Ratings:
Human Body Model (1.5 k
V OUT
Regulated Output Voltage
V IN
Power Supply Input
GND
Ground Terminal
C-
Flying Capacitor Negative Terminal
C+
Flying Capacitor Positive Terminal
SHDN
Shutdown Mode, Active-Low Input
SELECT
Output Voltage Select Pin.
(MCP1252-33X50, MCP1253-33X50)
Ω
in Series with 100 pF
...... ≥
4kV
Feedback Input Pin for Adjustable Output
(MCP1252-ADJ, MCP1253-ADJ)
400V
†Notice: Stresses above those listed under “Maximum Rat-
ings” may cause permanent damage to the device. This is a
stress rating only and functional operation of the device at
those or any other conditions above those indicated in the
operational listings of this specification is not implied. Expo-
sure to maximum rating conditions for extended periods may
affect device reliability.
≥
FB
ELECTRICAL CHARACTERISTICS
Electrical Specifications: Unless otherwise specified, all limits are specified for T A = -40°C to +85°C, SHDN = V IN ,
C IN = C OUT = 10 µF, C FLY = 1 µF, I OUT = 10 mA. Typical values are for T A = +25°C.
Parameters
Sym
Min
Typ
Max
Units
Conditions
Selectable Output - MCP1252-33X50, MCP1253-33X50: SELECT = V IN , V OUT = 3.3V
Supply Voltage
V IN
2.1
—
5.5
V
Output Voltage Accuracy
V OUT
-2.5
+/-0.5
+2.5
%
2.3V
≤
V IN < 2.5V, I OUT ≤
80 mA
2.5V
≤
V IN ≤
5.5V, I OUT ≤
120 mA
Output Current
I OUT
80
120
100
150
—mA
mA
2.3V
≤
V IN < 2.5V
2.5V
≤
V IN
≤
5.5V
SELECT Logic Input Voltage High
V IH
1.4
—
—
V
MCP1252-33X50, MCP1253-33X50
Selectable Output - MCP1252-33X50, MCP1253-33X50: SELECT = GND, V OUT = 5.0V
Supply Voltage
V IN
2.7
—
5.5
V
Output Voltage Accuracy
V OUT
-2.5
+/-0.5
+2.5
%
2.7V
≤
V IN < 3.0V, I OUT ≤
40 mA
3.0V
≤
V IN ≤
5.5V, I OUT ≤
120 mA
Output Current
I OUT
40
120
80
150
—mA
mA
2.7V
≤
V IN < 3.0V
3.0V
≤
V IN
≤
5.5V
SELECT Logic Input Voltage Low
V IL
—
—
0.4
V
MCP1252-33X50, MCP1253-33X50
Adjustable Output - MCP1252-ADJ, MCP1253-ADJ
Supply Voltage
V IN
2.0
—
5.5
V
Output Voltage Adjustment Range
V OUT
1.5
—
5.5
V
V OUT(MAX) < 2 x V IN
FB Regulation Voltage
V FB
1.18
1.21
1.24
V
MCP1252-ADJ, MCP1253-ADJ
ALL DEVICES
Supply Current
I DD
—60
120
µA
No load
Output Short-Circuit Current
I SC
—200
—mA V OUT = GND, foldback current
Shutdown Current
I SHDN
—
0.1
2.0
µA
SHDN = 0V
Power Efficiency
η
—81
68
—%
%
V IN = 3.0V, V OUT = 5V
V IN = 3.6V, V OUT = 5V
I OUT =120 mA
SHDN Logic Input Voltage Low
V IL
—
—
0.4
V
SHDN Logic Input Voltage High
V IH
1.4
—
—
V
PGOOD Threshold Voltage
V TH
—0.93 OUT
—V
PGOOD Hysteresis
V HYS
—0.04 OUT
—V
2002 Microchip Technology Inc.
DS21752A-page 3
Machine Body Model (200 pF, No Series Resistance
647854969.010.png
MCP1252/3
AC CHARACTERISTICS
Electrical Specifications: Unless ot herwis e specified, all limits are specified for T A = -40°C to +85°C,
V IN = 2.7V to 5.5V, SELECT = GND, SHDN = V IN , C IN = C OUT = 10 µF, C FLY = 1 µF, I OUT = 10 mA.
Typical values are for T A = +25°C.
Parameters
Sym
Min
Typ
Max
Units
Conditions
Internal Oscillator Frequency
F OSC
520
800
650
1000
780
1200
kHz
kHz
MCP1252
MCP1253
Ripple Voltage
V RIP
—50
45
— p-p
mV p-p
MCP1252
MCP1253
V OUT Wake-Up Time From Shutdown T WKUP
—200
300
—µsec
µsec
SELECT = V IN
SELECT = GND
V IN = 3 .6V, I OUT = 10 mA,
SHDN = V IH(MIN) ,
V OUT from 0 to 90% Nominal
Regulated Output Voltage
TEMPERATURE SPECIFICATIONS
Parameters
Symbol
Min
Typ
Max
Units
Conditions
Temperature Ranges:
Specified Temperature Range
T A
-40
—
+85
°C
Maximum Operating Junction
Temperature
T J
—
—
+125
°C
Storage Temperature Range
T A
-65
—
+150
°C
Thermal Package Resistances:
Thermal Resistance, 8 Pin MSOP
θ
JA
—
206
—
°C/W Single-Layer SEMI G42-88
Board, Natural Convection
DS21752A-page 4
2002 Microchip Technology Inc.
647854969.011.png
MCP1252/3
2.0 TYPICAL PERFORMANCE CURVES
Note: The graphs and tables provided following this note are a statistical summary based on a limited number of
samples and are provided for informational purposes only. The performance characteristics listed herein
are not tested or guaranteed. In some graphs or tables, the data presented may be outside the specified
operating range (e.g., outside specified power supply range) and therefore outside the warranted range.
Note: Unless otherwise indicated, V IN = 3.6V, T A = 25°C, C IN = C OUT = 10 µ F, C FLY = 1 µ F, all capacitors X7R ceramic.
5.05
100
90
5.04
80
70
10 mA
80 mA
120 mA
5.03
10 mA
60
5.02
50
80 mA
120 mA
40
5.01
MCP1252-33X50
SELECT = GND
V OUT = 5.0V
30
MCP1252-33X50
SELECT = GND
V OUT = 5.0V
5.00
20
10
4.99
0
2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
Supply Voltage (V)
2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
Supply Voltage (V)
FIGURE 2-1: Output Voltage vs. Supply
Voltage (MCP1252-33X50).
FIGURE 2-4: Percent Efficiency vs.
Supply Voltage (MCP1252-33X50).
.
3.34
100
90
80
10 mA
3.33
80 mA
70
80 mA
120 mA
60
120 mA
50
40
3.32
MCP1252-33X50
SELECT = V IN
V OUT = 3.3V
10 mA
30
MCP1252-33X50
SELECT = V IN
V OUT = 3.3V
20
10
3.31
0
2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
Supply Voltage (V)
2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
Supply Voltage (V)
FIGURE 2-2: Output Voltage vs. Supply
Voltage (MCP1252-33X50).
FIGURE 2-5: Power Efficiency vs. Supply
Voltage (MCP1252-33X50).
3.02
100
90
80
10 mA
70
3.01
80 mA
120 mA
10 mA
60
50
80 mA
40
3.00
30
120 mA
MCP1252-ADJ
V OUT = 3.0V
20
MCP1252-ADJ
V OUT = 3.0V
10
2.99
0
1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
Supply Voltage (V)
1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
Supply Voltage (V)
FIGURE 2-3: Output Voltage vs. Supply
Voltage (MCP1252-ADJ).
FIGURE 2-6: Power Efficiency vs. Supply
Voltage (MCP1252-ADJ).
2002 Microchip Technology Inc.
DS21752A-page 5
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