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LTC1986ES6#TRMPBF

P1-P3P4-P6P7-P8
1
LTC1986
1986fa
■
V
IN
Range: 2.6V to 4.4V
■
Ultralow Power
Operating Current: 14µA
Shutdown Current: <1µA
■
No Inductors
■
Short-Circuit/Thermal Protected
■
Ultrasmall Application Circuit (<0.045in
2
)
■
Low Profile (1mm) ThinSOT
TM
■
Step-Up Charge Pump Generates 5V
■
Output Current: 10mA
■
V
IN
to V
OUT
Direct Connection for 3V SIMs
■
Switching Frequency: 900kHz
■
Soft-Start Limits Inrush Current at Turn-On
■
Output Driven to Ground During Shutdown
The LTC
®
1986 is a micropower charge pump DC/DC
converter that provides power for either 3V or 5V GSM
SIM cards. It operates in one of three modes: V
OUT
= 5V
(5V mode), V
OUT
= V
IN
(3V mode) or shutdown. The input
voltage range is 2.6V to 4.4V and the part can provide
10mA of output current. The LTC1986 allows V
IN
to drop
as low as 2.6V by providing a boost feature in 3V mode. In
3V mode, V
OUT
is connected directly to V
IN
through a 2.5Ω
switch until V
IN
drops below 2.85V. When V
IN
is below
2.85V, the part automatically boosts V
OUT
to maintain a
regulated 2.9V output, thereby ensuring V
OUT
stays within
the 3V SIM V
CC
specification.
Extremely low operating current (14µA typical with no
load) and low external parts count make the part ideally
suited for small, light load battery-powered applications.
The total PCB area of the application circuit shown below
is less than 0.045in
2
. Protection features include inrush
current limiting, undervoltage lockout, short circuit and
thermal overload protection. The LTC1986 is available in
a low profile (1mm) SOT-23 package.
■
GSM Cellular Telephones
■
PCS/DCS Cellular Telephones
■
Portable POS Terminals
3V/5V SIM Power Supply
in ThinSOT
, LTC and LT are registered trademarks of Linear Technology Corporation.
V
OUT
GND
MODE
V
IN
C1
+
C1
–
1
2
3
6
5
4
V
OUT
= 5V
OR V
IN
GSM
CONTROLLER
2.2µF
0.047µF
0.1µF
V
IN
= 2.6V TO 4.4V
LTC1986
750k
1M
3/5
SHDN
1986 TA01
SHDN
0
0
1
1
3/5
0
1
0
1
MODE
SHUTDOWN
SHUTDOWN
V
OUT
= 5V
V
OUT
= V
IN
3V/5V SIM Power Supply
INPUT VOLTAGE (V)
2.5
OUTPUT VOLTAGE (V)
4
5
4.5
1986 TA02
3
2
3.0
3.5
4.0
6
T
A
= 25°C
I
OUT
= 10mA
5V MODE
3V MODE
(V
OUT
= V
IN
)
Output Voltage vs Input Voltage
APPLICATIO S
U
FEATURES
TYPICAL APPLICATIO
U
DESCRIPTIO
U
ThinSOT is a trademark of Linear Technology Corporation.
2
LTC1986
1986fa
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
PARAMETER CONDITIONS MIN TYP MAX UNITS
V
IN
Operating Voltage ● 2.6 4.4 V
V
OUT
Output Voltage Shutdown Mode 0 V
3V Mode. V
IN
= 2.85V to 4.4V, I
OUT
≤ 10mA V
IN
– 0.025 V
3V Mode, V
IN
< 2.85V, I
OUT
< 10mA ● 2.75 2.9 3.05 V
5V Mode, V
IN
< 2.7V, I
OUT
≤ 10mA ● 4.55 5 5.25 V
5V Mode, V
IN
= 2.7V to 4.4V, I
OUT
≤ 10mA ● 4.75 5 5.25 V
V
IN
Operating Current Shutdown Mode, V
MODE
= 0V ● 0.001 1 µA
3V Mode, I
OUT
= 0mA ● 10 25 µA
5V Mode, I
OUT
= 0mA ● 14 30 µA
V
IN
-to-V
OUT
ON Resistance 3V Mode, V
IN
= 3V ● 2.5 5 Ω
V
OUT
Short-Circuit Current 3V or 5V Mode, V
OUT
= 0V ● 100 200 mA
V
OUT
Discharge Resistance V
IN
= 3V ● 70 200 Ω
Switching Frequency Oscillator Free-Running 900 kHz
MODE Input Ranges Shutdown Mode
● 0V
IN
/2 – 0.1 V
5V Mode
● V
IN
/2 + 0.1 V
IN
– 1.0 V
3V Mode ● V
IN
– 0.25 V
IN
V
MODE Input Current ● –1 1 µA
Undervoltage Lockout Threshold 1.4 V
LTC1986ES6
T
JMAX
= 125°C, θ
JA
= 230°C/ W
ORDER PART
NUMBER
V
IN
, V
OUT
to GND .........................................–0.3V to 6V
All Other Pins to GND ..................................–0.3V to 6V
V
OUT
Short-Circuit Duration............................. Indefinite
Operating Temperature Range
(Note 2) .................................................. –40°C to 85°C
Storage Temperature Range ................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
(Note 1)
ABSOLUTE MAXIMUM RATINGS
W
WW
U
PACKAGE/ORDER INFORMATION
W
U
U
ELECTRICAL CHARACTERISTICS
The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are T
A
= 25°C.
V
IN
= V
MIN
to V
MAX
, MODE = V
IN
, C1 = 0.047µF, C
OUT
= 2.2µF, unless otherwise specified.
V
OUT
1
GND 2
MODE 3
TOP VIEW
S6 PACKAGE
6-LEAD PLASTIC SOT-23
6 V
IN
5 C1
+
4 C1
–
Note 2: The LTC1986E 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.
S6 PART MARKING
LTKX
Consult LTC Marketing for parts specified with wider operating temperature ranges.
3
LTC1986
1986fa
TYPICAL PERFORMANCE CHARACTERISTICS
U
W
Output Voltage vs Output Current
(3V Mode)
OUTPUT CURRENT (mA)
0.001
OUTPUT VOLTAGE (V)
10
1986 G01
0.01
0.1
1
3.10
3.05
3.00
2.95
2.90
V
IN
= V
MODE
= 3V
T
A
= 25°C
INPUT VOLTAGE (V)
2.5
EFFICIENCY (%)
4.5
1986 G02
3.0
3.5
4.0
100
80
60
40
20
I
OUT
= 10mA
V
OUT
= 5V
T
A
= 25°C
Efficiency vs Input Voltage
Efficiency vs Output Current
Positive Supply Current vs
Input Voltage
OUTPUT CURRENT (mA)
0.001
EFFICIENCY (%)
10
1986 G03
0.01
0.1
1
100
80
60
40
20
0
V
IN
= 3V
5V MODE (V
MODE
= 0.6V
IN
)
T
A
= 25°C
INPUT VOLTAGE (V)
2.5
POSITIVE SUPPLY CURRENT (mA )
4.5
1986 G04
3.0
3.5
4.0
40
30
20
10
0
I
OUT
= 0mA
T
A
= 25°C
5V MODE (V
MODE
= 0.6V
IN
)
3V MODE (V
MODE
= V
IN
)
Output Voltage Ripple
(5V Mode)
V
OUT
50mV/DIV
AC COUPLED
Output Voltage vs
V
MODE
Waveforms
5ms/DIV
V
IN
= 3V
I
OUT
= 10mA
T
A
= 25°C 1986 G05
V
OUT
2V/DIV
2ms/DIV
V
IN
= 4V
T
A
= 25°C 1986 G06
5V
0V
4V
0V
V
MODE
2V/DIV
P1-P3P4-P6P7-P8

LTC1986ES6#TRMPBF

Mfr. #:
Buy LTC1986ES6#TRMPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators 3V/5V SIM Pwr S in SOT
Lifecycle:
New from this manufacturer.
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