The SiP1759 is a buck-boost regulating charge pump. It is
designed to provide a regulated output from 1 cell Li Ion or 2/
3 cell NiMH voltages found in handheld portable equipment,
1.6 V to 5.5 V. SiP1759 allows the option of a fixed 3.3 V
output voltage, or an adjustable output which can be set from
2.5 V to 5.5 V. The output current is up to 100 mA.
For flexibility in application, SiP1759 has a shutdown pin
(SD) and an ERROR output to indicate when the output
voltage is in regulation.
SiP1759 is available in a 10 pin MSOP package and is rated
over the industrial temperature range of - 40 °C to 85 °C.
FEATURES
•
•
•
•
•
•
•
Output voltage - fixed 3.3 V or adjustable from 2.5 V to 5.5 V
1.6 V to 5.5 V input voltage range
100 mA output current
60 µA quiescent current
Shutdown current < 1 µA
Short circuit crotection
Thermal shutdown
•
MSOP-10 package
APPLICATIONS
•
•
•
•
1 cell Li ion battery powered equipment
2 to 3 cell NiMH battery powered equipment
2 to 3 cell alkaline battery powered equipment
Backup battery boost converters
TYPICAL APPLICATION CIRCUIT
C
X
C
X
C
X-
V
IN
C
iN
C
X+
V
OUT
V
IN
C
X-
PGND
C
X+
V
OUT
SiP1759
SD
GND
PGND
ERROR
FB
R
C
OUT
C
iN
SiP1759
SD
GND
PGND
ERROR
FB
R
R
1
C
OUT
R
2
Fixed Output
Adjustable Output Voltage
Document Number: 72949
S09-1453-Rev. D, 03-Aug-09
www.vishay.com
1
SiP1759
Vishay Siliconix
ABSOLUTE MAXIMUM RATINGS
(all voltages referenced to GND = 0 V)
Parameter
Input Voltage (V
IN
)
OUT SD, FB, ERROR to GND
C
X-
to GND
C
X+
to GND
Storage Temperature
Maximum Junction Temperature
Power Dissipation
a,b
MSOP-10 (T
A
= 70 °C)
Notes:
a. Device Mounted with all leads soldered or welded to PC board.
b. Derate 5.6 mW/°C above 25 °C.
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation
of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum
rating conditions for extended periods may affect device reliability.
Limit
- 0.3 to 6
- 0.3 to 6
- 0.3 to (V
IN
+ 0.3)
- 0.3 to (the greater of V
IN
or V
OUT
) + 1)
- 55 to 150
150
444
Unit
V
°C
mW
RECOMMENDED OPERATING RANGE
(all voltages referenced to GND = 0 V)
Parameter
Input Voltage Range
Output Voltage Adjustment Range
C
IN
C
X
C
OUT
Operating Temperature Range
Limit
1.6 to 5.5
2.5 to 5.5
10
0.33
10
- 40 to 85
°C
µF
Unit
V
SPECIFICATIONS
Test Condition Unless Specified
V
IN
= V
SD
= 2 V, FB = PGND = GND
C
IN
= 10 µF, C
x
= 0.33 µF, C
OUT
= 10 µF
Limits
- 40 °C to 85 °C
Temp.
a
Full
Full
1.6 V
≤
V
IN
≤
5.5 V
2 V
≤
V
IN
≤
5.5 V, 1 mA
≤
I
OUT
≤
50 mA
Output Voltage
V
OUT
2.5 V
≤
V
IN
≤
5.5 V, 1 mA
≤
I
OUT
≤
100 mA
2 V
≤
V
IN
≤
5.5 V, 1 mA
≤
I
OUT
≤
50 mA
2.5 V≤ V
IN
≤
5.5 V, 1 mA
≤
I
OUT
≤
100 mA
Maximum Output Current
Transient Load Current
Quiescent Supply Current
Shutdown Supply Current
Output Leakage Current in
Shutdown
SD Logic Input Voltage
SD Input Leakage Current
FB Regulation Voltage
FB Input Current
V
FB
I
IFB
I
Q
I
QSD
SD
V
IL
V
IH
I
OUT(max)
2.5 V
≤
V
IN
≤
5.5 V
I
OUT
≤
100 mA (RMS)
V
IN
= V
SD
= 4 V, V
FB
= 0 V, Stepping Down
V
IN
= V
SD
= 2 V, V
FB
= 0 V, Stepping Up
1.6 V
≤
V
IN
≤
5.5 V, V
SD
= 0 V
V
IN
= 2 V, V
OUT
= 3.3 V, V
SD
= 0 V
1 6 V
≤
V
IN
≤
5 5 V
V
SD
= 5.5 V
V
IN
= 1.65 V, V
OUT
= 3.3 V
V
FB
= 1.27 V
Full
0 °C to
85 °C
Full
Full
0 °C to 85 °C
Full
Full
Full
Full
Full
Full
Full
Full
0.7 * V
IN
-1
1.205
1.235
25
1
1.265
200
Min.
1.6
0.7
2.5
3.17
3.17
3.15
3.15
100
200
60
60
1
1
100
100
5
5
0.25 * V
IN
V
µA
V
nA
µA
3.3
3.3
1.0
Typ.
b
Max.
5.5
1.5
5.5
3.43
3.43
3.45
3.45
mA
V
Unit
Parameter
Input Voltage Range
Input Undervoltage Lockout
Output Voltage Adjustment
Range
Symbol
V
IN
V
UVLO
www.vishay.com
2
Document Number: 72949
S09-1453-Rev. D, 03-Aug-09
SiP1759
Vishay Siliconix
SPECIFICATIONS
Test Condition Unless Specified
V
IN
= V
SD
= 2 V, FB = PGND = GND
C
IN
= 10 µF, C
x
= 0.33 µF, C
OUT
= 10 µF
Internal feedback
External feedback
Falling edge at FB
V
OL
f
OSC
I
OL
= 0.5 mA, V
IN
= 2 V
V
ERROR
= 5.5 V, V
FB
= 1.27 V
1.6 V
≤
V
IN
≤
5.5 V, V
FB
= 1 V
V
OUT
= 0 V, 2.5 V
≤
V
IN
≤
5.5 V
foldback current limit
Temperature rising
Limits
- 40 °C to 85 °C
Temp.
a
Full
Full
Full
Full
Full
Full
Full
Full
Full
V
IN
= 3.6 V, I
OUT
= 10 mA
Full
1.2
200
1.0
Min.
Typ.
b
100
100
1.1
5
0.01
1.5
110
160
20
90
%
1.2
100
0.2
1.8
Max.
50
Unit
mV
V
mV
µA
MHz
mA
Parameter
FB Dual Mode Threshold
ERROR Trip Voltage
ERROR Output Low Voltage
ERROR Leakage Current
Switching Frequency
Output Short-Circuit Current
Thermal Shutdown
Temperature
Thermal Shutdown Hysteresis
Efficiency
Symbol
°C
Notes:
a. Full = as determined by the operating suffix.
b. Typical values are for Design Aid only, not guaranteed nor subject to production testing.
PIN CONFIGURATION AND TRUTH TABLE
MSOP-10
ERROR
SD
V
IN
V
IN
GND
1
2
3
4
5
10
9
8
7
6
ORDERING INFORMATION
Part Number
FB
V
OUT
C
X+
C
X-
PGND
Temperature Range
- 40 °C to 85 °C
Temperature Range
- 40 °C to 85 °C
Marking
1759
Board
Surface Mount
SiP1759DH-T1
Eval Kit
SiP1759DB
Top View
PIN DESCRIPTION
Pin Number
1
2
3, 4
5
6
7
8
9
10
Name
ERROR
SD
V
IN
GND
PGND
C
X-
C
X+
V
OUT
FB
Shutdown input
Input voltage
Ground
Power ground
Negative terminal of the charge pump capacitor
Positive terminal of the charge pump capacitor
Regulated output voltage
Feedback input - connected to GND for fixed 3.3 V output. Connected to a resistive divider for an adjustable output
Function
Open drain error flag - a low output indicates that the output voltage is out of range
Document Number: 72949
S09-1453-Rev. D, 03-Aug-09
www.vishay.com
3
SiP1759
Vishay Siliconix
FUNCTIONAL BLOCK DIAGRAM
C
X
-
C
X+
V
IN
PGND
S1
Control
S2
V
OUT
SD
Bias
Oscillator
+
-
+
-
1.235 V
ERROR
FB
+
-
+
-
+
-
GND
+
-
DETAILED DESCRIPTION
The SiP1759 is a buck-boost regulating charge pump. This
allows for the V
IN
to be a higher or lower voltage than the
regulated output. This is done with a charge pump that when
V
IN
is lower than V
OUT
is a regulated voltage doubler. When
V
IN
is higher than V
OUT
the charge pump is a step down
gated switch.
In boost mode, the IC controls the transfer capacitor through
C
X+
and C
X-
pins, switching the charge to the output keeping
it regulated. In this mode the charge pump only switches to
maintain regulation, the output ripple does not increase with
light loads. In buck mode, the C
X-
pin is internally connected
to PGND and the C
X+
is switched internally between V
IN
and
V
OUT
. Unless V
IN
is significantly larger than V
OUT
(V
IN
≥
V
OUT
+ 1 V), in heavy load the IS will slip from buck mode to
boost mode as necessary to charge the transfer capacitor.
Shutdown Mode
The IC is designed to conserve power by decreasing current
consumption during normal operation as well as shutdown
mode. Pulling the SD pin logic low, the output is
disconnected from the input and is in high impedance; the
internal circuitry of the oscillator, control logic, and the
charge-pump switches are turned off, decreasing the current
consumption to less than 1 µA.
Undervoltage Lockout
When V
IN
falls below 1 V the undervoltage lockout disables
the SiP1759.
www.vishay.com
4
Document Number: 72949
S09-1453-Rev. D, 03-Aug-09
Power OK Output
POK is an open-drain output that goes low when the
regulator feedback voltage falls below 1.1 V. A 10 kΩ to 1 MΩ
pull-up resistor from POK to OUT should be used to provide
a logic output and keep current consumption to a minimum.
Connect POK to GND or leave floating if not used. The POK
output is high impedance when the IC is in shutdown mode.
Fixed Output
The SiP1759 can be configured as a fixed 3.3 V output
regulator or as an adjustable output from 2.5 V to 5.5 V. In
the fixed 3.3 V output mode the feedback voltage is
generated from the internal resistor-divider network. The FB
pin must be tied to GND.
Soft-Start and Short Circuit Protection
The IC features a soft-start mechanism that limits the inrush
current during start-up and if the output is short circuited the
SiP1759 limits the output current to 110 mA.
Thermal Shutdown
The SiP 1759 is designed with a thermal shutdown circuit
that will shut down the IC when the die temperature exceeds
160 °C. The thermal shutdown has 20 °C of hysteresis,
insuring when the die cools down the IC will turn on again.
SiP1759
Vishay Siliconix
DESIGNS CONSIDERATIONS
Setting the Adjustable Output Voltage
The SiP1759 regulated output can be adjusted from 2.5 V to
5.5 V via resistor divider network from V
OUT
to GND (see
Typical Application Circuits). R1 and R2 should be kept in the
50 kΩ to 100 kΩ range for low power consumption, while
maintaining adequate noise immunity. The value R1 is
calculated using the following formula:
R1 = R2 {(V
OUT
/V
FB
) - 1}
V
FB
is nominally 1.235 V.
Capacitor Selection
Capacitor selection for C
IN
, C
OUT
and C
X
will have an impact
in the voltage output ripple, output current and overall
physical size of the circuit.
Ceramic capacitors are recommenced for their low ESR
(≤ 20 mΩ) which will help keep the output voltage ripple at a
minimum. The initial values for the C
IN
and C
OUT
capacitors
should be 10 µF, the C
X
capacitor should be 0.33 µF.
Output Voltage Ripple
The SiP1759 automatically decides whether to be in step up
mode or step down mode depending on the V
IN
, V
OUT
and
current load conditions, therefore the voltage output ripple
will vary. In step-up mode the voltage output ripple is higher
than step-down mode. But unless V
IN
is significant larger
than V
OUT
(V
IN
≥
V
OUT
+ 1 V) , in heavy load the IC will slip
from buck mode to boost mode as necessary to charge the
transfer capacitor and the ripple will increase. Reducing the
C
X
capacitor value will cause an increase in the switching
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