MCP1252/3
Low Noise, Positive-Regulated Charge Pump
Features
• 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
Description
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
2
3
4
8
SELECT
SHDN
C+
C-
MCP1252
MCP1253
7
6
5
MSOP (ADJUSTABLE)
PGOOD
V
OUT
V
IN
GND
1
2
MCP1252
3
MCP1253
4
8
7
6
5
FB
SHDN
C+
C-
2002-2013 Microchip Technology Inc.
DS21752B-page 1
MCP1252/3
Functional Block Diagram
MCP1252-33X50
MCP1253-33X50
PGOOD
+
-
84 mV
1.21V
-
+
V
OUT
200 mV
Switch
Control
V
IN
GND
PGOOD
FB
+
-
V
OUT
200 mV
Switch
Control
V
IN
GND
DS21752B-page 2
-
+
-
+
-
+
+
+
140 k
173 k
SELECT
100 k
+
SHDN
C+
C-
MCP1252-ADJ
MCP1253-ADJ
84 mV
1.21V
+
+
+
SHDN
C+
C-
2002-2013 Microchip Technology Inc.
MCP1252/3
1.0
ELECTRICAL
CHARACTERISTICS
PIN FUNCTION TABLE
Name
PGOOD
V
OUT
V
IN
GND
C-
C+
SHDN
SELECT
FB
Function
Open-Drain Power GOOD Output
Regulated Output Voltage
Power Supply Input
Ground Terminal
Flying Capacitor Negative Terminal
Flying Capacitor Positive Terminal
Shutdown Mode, Active-Low Input
Output Voltage Select Pin.
(MCP1252-33X50, MCP1253-33X50)
Feedback Input Pin for Adjustable Output
(MCP1252-ADJ, MCP1253-ADJ)
Absolute Maximum Ratings †
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 in Series with 100 pF
4
kV
Machine Body Model (200 pF, No Series Resistance400V
†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.
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
Output Voltage Accuracy
Output Current
SELECT Logic Input Voltage High
Supply Voltage
Output Voltage Accuracy
Output Current
SELECT Logic Input Voltage Low
Supply Voltage
Output Voltage Adjustment Range
FB Regulation Voltage
ALL DEVICES
Supply Current
Output Short-Circuit Current
Shutdown Current
Power Efficiency
I
DD
I
SC
I
SHDN
—
—
—
—
60
200
0.1
81
68
—
—
0.93V
OUT
0.04V
OUT
120
—
2.0
—
µA
mA
µA
%
%
V
V
V
V
No load
V
OUT
= GND, foldback current
SHDN = 0V
V
IN
= 3.0V, V
OUT
= 5V
V
IN
= 3.6V, V
OUT
= 5V
I
OUT
=120 mA
V
IN
V
OUT
I
OUT
V
IH
V
IN
V
OUT
I
OUT
V
IL
V
IN
V
OUT
V
FB
2.1
-2.5
80
120
1.4
2.7
-2.5
40
120
—
2.0
1.5
1.18
—
+/-0.5
100
150
—
—
+/-0.5
80
150
—
—
—
1.21
5.5
+2.5
—
—
5.5
+2.5
—
0.4
5.5
5.5
1.24
V
%
mA
mA
V
V
%
mA
mA
V
V
V
V
V
OUT(MAX)
< 2 x V
IN
MCP1252-ADJ, MCP1253-ADJ
2.7V
V
IN
< 3.0V, I
OUT
40
mA
3.0V
V
IN
5.5V,
I
OUT
120
mA
2.7V
V
IN
< 3.0V
3.0V
V
IN
5.5V
MCP1252-33X50, MCP1253-33X50
2.3V
V
IN
< 2.5V, I
OUT
80
mA
2.5V
V
IN
5.5V,
I
OUT
120
mA
2.3V
V
IN
< 2.5V
2.5V
V
IN
5.5V
MCP1252-33X50, MCP1253-33X50
Selectable Output - MCP1252-33X50, MCP1253-33X50: SELECT = GND, V
OUT
= 5.0V
Adjustable Output - MCP1252-ADJ, MCP1253-ADJ
SHDN Logic Input Voltage Low
SHDN Logic Input Voltage High
PGOOD Threshold Voltage
PGOOD Hysteresis
2002-2013 Microchip Technology Inc.
V
IL
V
IH
V
TH
V
HYS
—
1.4
—
—
0.4
—
—
—
DS21752B-page 3
MCP1252/3
AC CHARACTERISTICS
Electrical Specifications:
Unless otherwise 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
Internal Oscillator Frequency
Ripple Voltage
Sym
F
OSC
V
RIP
Min
520
800
—
—
Typ
650
1000
50
45
200
300
Max
780
1200
—
—
Units
kHz
kHz
mV
p-p
mV
p-p
µsec
µsec
Conditions
MCP1252
MCP1253
MCP1252
MCP1253
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
V
OUT
Wake-Up Time From Shutdown T
WKUP
TEMPERATURE SPECIFICATIONS
Parameters
Temperature Ranges:
Specified Temperature Range
Maximum Operating Junction
Temperature
Storage Temperature Range
Thermal Package Resistances:
Thermal Resistance, 8 Pin MSOP
JA
—
206
—
°C/W
Single-Layer SEMI G42-88
Board, Natural Convection
T
A
T
J
T
A
-40
—
-65
—
—
—
+85
+125
+150
°C
°C
°C
Symbol
Min
Typ
Max
Units
Conditions
DS21752B-page 4
2002-2013 Microchip Technology Inc.
MCP1252/3
2.0
Note:
TYPICAL PERFORMANCE CURVES
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
Output Voltage (V)
5.04
5.03
5.02
80 mA
5.01
5.00
4.99
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
Supply Voltage (V)
120 mA
MCP1252-33X50
SELECT = GND
V
OUT
= 5.0V
10 mA
Percent Efficiency (%)
100
90
80
70
60
50
40
30
20
10
0
2.0
2.5
3.0
3.5
4.0
10 mA
80 mA
120 mA
MCP1252-33X50
SELECT = GND
V
OUT
= 5.0V
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
Power Efficiency (%)
Output Voltage (V)
3.33
80 mA
120 mA
3.32
MCP1252-33X50
SELECT = V
IN
V
OUT
= 3.3V
2.0
2.5
3.0
3.5
4.0
4.5
10 mA
3.31
5.0
5.5
6.0
Supply Voltage (V)
100
90
80
70
60
50
40
30
20
10
0
2.0
2.5
10 mA
80 mA
120 mA
MCP1252-33X50
SELECT = V
IN
V
OUT
= 3.3V
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
Power Efficiency (%)
Output Voltage (V)
3.01
10 mA
80 mA
120 mA
2.99
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
Supply Voltage (V)
MCP1252-ADJ
V
OUT
= 3.0V
3.00
100
90
80
70
60
50
40
30
20
10
0
1.5
2.0
2.5
10 mA
80 mA
120 mA
MCP1252-ADJ
V
OUT
= 3.0V
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).
2002-2013 Microchip Technology Inc.
DS21752B-page 5
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