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Linear Technology Electronic Components Datasheet

LTC1751-5 Datasheet

Micropower/ Regulated Charge Pump DC/DC Converters

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LTC1751-5 pdf
LTC1751/LTC1751-3.3/LTC1751-5
Micropower, Regulated
Charge Pump
DC/DC Converters
FEATURES
s 5V Output Current: 100mA (VIN 3V)
s 3.3V Output Current: 80mA (VIN 2.5V)
s Ultralow Power: 20µA Quiescent Current
s Regulated Output Voltage: 3.3V ±4%, 5V ±4%, ADJ
s No Inductors
s Short-Circuit/Thermal Protection
s VIN Range: 2V to 5.5V
s 800kHz Switching Frequency
s Very Low Shutdown Current: <2µA
s Shutdown Disconnects Load from VIN
s PowerGood/Undervoltage Output
s Adjustable Soft-Start Time
s Available in an 8-Pin MSOP Package
U
APPLICATIO S
s Li-Ion Battery Backup Supplies
s Local 3V and 5V Conversion
s Smart Card Readers
s PCMCIA Local 5V Supplies
s White LED Backlighting
DESCRIPTIO
The LTC®1751 family are micropower charge pump DC/
DC converters that produce a regulated output voltage at
up to 100mA. The input voltage range is 2V to 5.5V.
Extremely low operating current (20µA typical with no
load) and low external parts count (one flying capacitor
and two small bypass capacitors at VIN and VOUT) make
them ideally suited for small, battery-powered applica-
tions.
The LTC1751 family operate as Burst ModeTM switched
capacitor voltage doublers to achieve ultralow quiescent
current. They have thermal shutdown capability and can
survive a continuous short circuit from VOUT to GND. The
PGOOD pin on the LTC1751-3.3 and LTC1751-5 indicates
when the output voltage has reached its final value and if
the output has an undervoltage fault condition. The FB pin
of the adjustable LTC1751 can be used to program the
desired output voltage or current. An optional soft-start
capacitor may be used at the SS pin to prevent excessive
inrush current during start-up.
The LTC1751 family is available in an 8-pin MSOP
package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a trademark of Linear Technology Corporation.
TYPICAL APPLICATIO
Regulated 5V Output from a 2.7V to 5.5V Input
VIN
2.7V
TO 5.5V C2
10µF
OFF ON
3
VIN
2
VOUT
71
SHDN PGOOD
8
LTC1751-5
SS C+
6
4
GND
C5
R1
100k
PGOOD
CFLY
1µF
1751 TA01
CFLY = MURATA GRM39X5R105K6.3AJ
C1, C2 = MURATA GRM40X5R106K6.3AJ
VOUT
C1
10µF
5V ±4%
IOUT 100mA, VIN 3V
IOUT 50mA, VIN 2.7V
Output Voltage vs Input Voltage
5.2
IOUT = 50mA
CFLY = 1µF
COUT = 10µF
5.1
TA = 85°C
5.0 TA = 25°C
TA = –40°C
4.9
4.8
2.5
3.0 3.5 4.0 4.5
INPUT VOLTAGE (V)
5.0 5.5
1751 TA02
1


Linear Technology Electronic Components Datasheet

LTC1751-5 Datasheet

Micropower/ Regulated Charge Pump DC/DC Converters

No Preview Available !

LTC1751-5 pdf
LTC1751/LTC1751-3.3/LTC1751-5
ABSOLUTE AXI U RATI GS
(Note 1)
VIN to GND .................................................. – 0.3V to 6V
PGOOD, FB, VOUT to GND ........................... – 0.3V to 6V
SS, SHDN to GND ........................ – 0.3V to (VIN + 0.3V)
VOUT Short-Circuit Duration ............................. Indefinite
IOUT (Note 2)....................................................... 125mA
Operating Temperature Range (Note 3) .. – 40°C to 85°C
Storage Temperature Range ................ – 65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
UW U
PACKAGE/ORDER I FOR ATIO
TOP VIEW
FB/PGOOD* 1
VOUT 2
VIN 3
GND 4
8 SS
7 SHDN
6 C+
5 C
MS8 PACKAGE
8-LEAD PLASTIC MSOP
TJMAX = 150°C, θJA = 160°C/W
*PGOOD ON LTC1751-3.3/LTC1751-5
FB ON LTC1751
ORDER PART
NUMBER
LTC1751EMS8
LTC1751EMS8-3.3
LTC1751EMS8-5
MS8 PART MARKING
LTKL
LTKN
LTKP
Consult factory for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS The q denotes specifications which apply over the full specified
temperature range, otherwise specifications are at TA = 25°C. CFLY = 1µF, CIN = 10µF, COUT = 10µF unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX
LTC1751-3.3
VIN Input Supply Voltage
VOUT Output Voltage
ICC
VR
η
LTC1751-5
Operating Supply Current
Output Ripple
Efficiency
2V VIN 4.4V, IOUT 40mA
2.5V VIN 4.4V, IOUT 80mA
2V VIN 4.4V, IOUT = 0mA, SHDN = VIN
VIN = 2.5V, IOUT = 40mA
VIN = 2V, IOUT = 40mA
q2
4.4
q 3.17 3.3 3.43
q 3.17 3.3 3.43
q 18 40
68
80
VIN
VOUT
ICC
VR
η
LTC1751
Input Supply Voltage
Output Voltage
Operating Supply Current
Output Ripple
Efficiency
2.7V VIN 5.5V, IOUT 50mA
3V VIN 5.5V, IOUT 100mA
2.7V VIN 5.5V, IOUT = 0mA, SHDN = VIN
VIN = 3V, IOUT = 50mA
VIN = 3V, IOUT = 50mA
q 2.7
5.5
q 4.8 5 5.2
q 4.8 5 5.2
q 20 50
75
82
VIN
ICC
VFB
IFB
ROUT
Input Supply Voltage
Operating Supply Current
FB Regulation Voltage
FB Input Current
Open-Loop Charge Pump Strength
q2
2V VIN 5.5V, IOUT = 0mA, SHDN = VIN (Note 4 ) q
2V VIN 5.5V, IOUT 20mA
q 1.157
VFB = 1.3V
q – 50
VIN = 2V, VOUT = 3.3V (Note 5)
VIN = 2.7V, VOUT = 5V (Note 5)
q
q
16
1.205
8.5
6.0
5.5
40
1.253
50
20
12
UNITS
V
V
V
µA
mVP-P
%
V
V
V
µA
mVP-P
%
V
µA
V
nA
2


Part Number LTC1751-5
Description Micropower/ Regulated Charge Pump DC/DC Converters
Maker Linear Technology
Total Page 12 Pages
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