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LTC1751EMS8-3.3#PBF

P1-P3P4-P6P7-P9P10-P12
1
LTC1751/LTC1751-3.3/LTC1751-5
APPLICATIO S
U
FEATURES
DESCRIPTIO
U
TYPICAL APPLICATIO
U
Micropower, Regulated
Charge Pump
DC/DC Converters
■
5V Output Current: 100mA (V
IN
≥ 3V)
■
3.3V Output Current: 80mA (V
IN
≥ 2.5V)
■
Ultralow Power: 20µA Quiescent Current
■
Regulated Output Voltage: 3.3V ±4%, 5V ±4%, ADJ
■
No Inductors
■
Short-Circuit/Thermal Protection
■
V
IN
Range: 2V to 5.5V
■
800kHz Switching Frequency
■
Very Low Shutdown Current: <2µA
■
Shutdown Disconnects Load from V
IN
■
PowerGood/Undervoltage Output
■
Adjustable Soft-Start Time
■
Available in an 8-Pin MSOP Package
■
Li-Ion Battery Backup Supplies
■
Local 3V and 5V Conversion
■
Smart Card Readers
■
PCMCIA Local 5V Supplies
■
White LED Backlighting
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 V
IN
and V
OUT
) make
them ideally suited for small, battery-powered applica-
tions.
The LTC1751 family operate as Burst Mode
TM
switched
capacitor voltage doublers to achieve ultralow quiescent
current. They have thermal shutdown capability and can
survive a continuous short circuit from V
OUT
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.
V
IN
SHDN
SS
GND
2
1
6
5
3
7
8
4
V
OUT
PGOOD
C
+
C
–
LTC1751-5
V
OUT
5V ±4%
I
OUT
≤ 100mA, V
IN
≥ 3V
I
OUT
≤ 50mA, V
IN
≥ 2.7V
V
IN
2.7V
TO 5.5V
C2
10µF
C
FLY
1µF
PGOOD
R1
100k
OFF ON
1751 TA01
C1
10µF
C
FLY
= MURATA GRM39X5R105K6.3AJ
C1, C2 = MURATA GRM40X5R106K6.3AJ
Regulated 5V Output from a 2.7V to 5.5V Input
Output Voltage vs Input Voltage
INPUT VOLTAGE (V)
2.5
4.8
OUTPUT VOLTAGE (V)
4.9
5.0
5.1
5.2
3.0 3.5 4.0 4.5
1751 TA02
5.0 5.5
I
OUT
= 50mA
C
FLY
= 1µF
C
OUT
= 10µF
T
A
= 25°C
T
A
= –40°C
T
A
= 85°C
2
LTC1751/LTC1751-3.3/LTC1751-5
ORDER PART
NUMBER
LTC1751EMS8
LTC1751EMS8-3.3
LTC1751EMS8-5
T
JMAX
= 150°C, θ
JA
= 160°C/W
*PGOOD ON LTC1751-3.3/LTC1751-5
FB ON LTC1751
Consult factory for parts specified with wider operating temperature ranges.
The ● denotes specifications which apply over the full specified
temperature range, otherwise specifications are at T
A
= 25°C. C
FLY
= 1µF, C
IN
= 10µF, C
OUT
= 10µF unless otherwise noted.
(Note 1)
V
IN
to GND.................................................. –0.3V to 6V
PGOOD, FB, V
OUT
to GND ........................... –0.3V to 6V
SS, SHDN to GND........................ –0.3V to (V
IN
+ 0.3V)
V
OUT
Short-Circuit Duration............................. Indefinite
I
OUT
(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
ABSOLUTE AXI U RATI GS
WWWU
PACKAGE/ORDER I FOR ATIO
UU
W
ELECTRICAL CHARACTERISTICS
1
2
3
4
FB/PGOOD*
V
OUT
V
IN
GND
8
7
6
5
SS
SHDN
C
+
C
–
TOP VIEW
MS8 PACKAGE
8-LEAD PLASTIC MSOP
MS8 PART MARKING
LTKL
LTKN
LTKP
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
LTC1751-3.3
V
IN
Input Supply Voltage ● 2 4.4 V
V
OUT
Output Voltage 2V ≤ V
IN
≤ 4.4V, I
OUT
≤ 40mA ● 3.17 3.3 3.43 V
2.5V ≤ V
IN
≤ 4.4V, I
OUT
≤ 80mA ● 3.17 3.3 3.43 V
I
CC
Operating Supply Current 2V ≤ V
IN
≤ 4.4V, I
OUT
= 0mA, SHDN = V
IN
● 18 40 µA
V
R
Output Ripple V
IN
= 2.5V, I
OUT
= 40mA 68 mV
P-P
η Efficiency V
IN
= 2V, I
OUT
= 40mA 80 %
LTC1751-5
V
IN
Input Supply Voltage ● 2.7 5.5 V
V
OUT
Output Voltage 2.7V ≤ V
IN
≤ 5.5V, I
OUT
≤ 50mA ● 4.8 5 5.2 V
3V ≤ V
IN
≤ 5.5V, I
OUT
≤ 100mA ● 4.8 5 5.2 V
I
CC
Operating Supply Current 2.7V ≤ V
IN
≤ 5.5V, I
OUT
= 0mA, SHDN = V
IN
● 20 50 µA
V
R
Output Ripple V
IN
= 3V, I
OUT
= 50mA 75 mV
P-P
η Efficiency V
IN
= 3V, I
OUT
= 50mA 82 %
LTC1751
V
IN
Input Supply Voltage ● 2 5.5 V
I
CC
Operating Supply Current 2V ≤ V
IN
≤ 5.5V, I
OUT
= 0mA, SHDN = V
IN
(Note 4 ) ● 16 40 µA
V
FB
FB Regulation Voltage 2V ≤ V
IN
≤ 5.5V, I
OUT
≤ 20mA ● 1.157 1.205 1.253 V
I
FB
FB Input Current V
FB
= 1.3V ● –50 50 nA
R
OUT
Open-Loop Charge Pump Strength V
IN
= 2V, V
OUT
= 3.3V (Note 5) ● 8.5 20 Ω
V
IN
= 2.7V, V
OUT
= 5V (Note 5) ● 6.0 12 Ω
3
LTC1751/LTC1751-3.3/LTC1751-5
The ● denotes specifications which apply over the full specified
temperature range, otherwise specifications are at T
A
= 25°C. C
FLY
= 1µF, C
IN
= 10µF, C
OUT
= 10µF unless otherwise noted.
ELECTRICAL CHARACTERISTICS
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: Based on long term current density limitations.
Note 3: The LTC1751EMS8-X is guaranteed to meet performance
specifications from 0°C to 70°C. Specifications over the –40°C to 85°C
operating temperature range are assured by design, characterization and
correlation with statistical process controls.
Note 4: The no load input current will be approximately I
CC
plus twice the
standing current in the resistive output divider.
Note 5: R
OUT
≡ (2V
IN
– V
OUT
)/I
OUT
.
Note 6: See Figure 2.
TYPICAL PERFOR A CE CHARACTERISTICS
UW
Output Voltage vs Load Current
LOAD CURRENT (mA)
0
3.20
OUTPUT VOLTAGE (V)
3.25
3.30
3.35
3.40
25 50 75 100
1751 G01
125 150
T
A
= 25°C
C
FLY
= 1µF
V
IN
= 2V
V
IN
= 2.5V
INPUT VOLTAGE (V)
2.0
OUTPUT VOLTAGE (V)
3.30
3.35
4.0
1751 G02
3.25
3.20
2.5
3.0
3.5
4.5
3.40
I
OUT
= 40mA
C
FLY
= 1µF
C
OUT
= 10µF
T
A
= –40°C
T
A
= 85°C
T
A
= 25°C
INPUT VOLTAGE (V)
2.0
SUPPLY CURRENT (µA)
20
30
4.0
1751 G03
10
0
2.5
3.0
3.5
4.5
40
I
OUT
= 0mA
C
FLY
= 1µF
V
SHDN
= V
IN
T
A
= 85°C
T
A
= 25°C
T
A
= –40°C
Output Voltage vs Input Voltage
No Load Supply Current
vs Input Voltage
(LTC1751-3.3)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
LTC1751-3.3/LTC1751-5
UVL PGOOD Undervoltage Low Threshold Relative to Regulated V
OUT
(Note 6) ● –11 –7 –3 %
UVH PGOOD Undervoltage High Threshold Relative to Regulated V
OUT
(Note 6) ● –8 –4.5 –2 %
V
OL
PGOOD Low Output Voltage I
PGOOD
= –500µA ● 0.4 V
I
OH
PGOOD High Output Leakage V
PGOOD
= 5.5V ● 1 µA
LTC1751/LTC1751-3.3/LTC1751-5
I
SHDN
Shutdown Supply Current V
IN
≤ 3.6V, V
OUT
= 0V, V
SHDN
= 0V ● 0.01 2 µA
3.6V < V
IN
, V
OUT
= 0V, V
SHDN
= 0V ● 5 µA
V
IH
SHDN Input Threshold (High) ● 1.5 V
V
IL
SHDN Input Threshold (Low) ● 0.3 V
I
IH
SHDN Input Current (High) SHDN = V
IN
● –1 1 µA
I
IL
SHDN Input Current (Low) SHDN = 0V ● –1 1 µA
t
r
V
OUT
Rise Time V
IN
= 3V, I
OUT
= 0mA, 10% to 90% (Note 6) 0.6ms/nF • C
SS
sec
f
OSC
Switching Frequency Oscillator Free Running 800 kHz
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LTC1751EMS8-3.3#PBF

Mfr. #:
Buy LTC1751EMS8-3.3#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators Reg 3.3V Charge Pump at 100mA
Lifecycle:
New from this manufacturer.
Delivery:
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