Positive Doubling Charge Pump with
Shutdown in SOT Package
TC1240
ABSOLUTE MAXIMUM RATINGS*
Input Voltage (V
IN
to GND) .......................... +4.5V, –0.3V
Output Voltage (OUT to GND) .............. +9.0V, V
IN
– 0.3V
Current at OUT Pin ................................................. 50 mA
Short-Circuit Duration –OUT to GND ................ Indefinite
Operating Temperature Range ...............–40
°C
to +85°C
Power Dissipation (T
A
≤
70°C)
6-Pin SOT-23A ..........................................240 mW
Storage Temperature (Unbiased) ......... –65
°C
to +150°C
Lead Temperature (Soldering, 10 sec) ................. +300°C
*Static-sensitive device. Unused devices must be stored in conductive
material. Protect devices from static discharge and static fields. Stresses
above those listed under Absolute Maximum Ratings may cause perma-
nent damage to the device. These are stress ratings only and functional
operation of the device at these or any other conditions above 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.
ELECTRICAL CHARACTERISTICS:
T
A
= –40 to +85
°C,
V
IN
= +2.8V, C1 = C2 = 3.3µF , SHDN = GND,
unless otherwise noted. Typical values are at T
A
= +25°C.
Symbol
IDD
I
SHDN
V
MIN
V
MAX
F
OSC
F
SW
V
IH
V
IL
P
EFF
V
EFF
R
OUT
Parameter
Supply Current
Shutdown Supply Current
Minimum Supply Voltage
Maximum Supply Voltage
Oscillator Frequency
Switching Frequency
Shutdown Input Logic High
Shutdown Input Logic Low
Power Efficiency
Voltage Conversion
Efficiency
Output Resistance
(Note 1)
Test Conditions
R
LOAD =
∞
SHDN = V
IN
R
LOAD
= 1.0KΩ
R
LOAD
= 1.0KΩ
T
A
= –40
°C
to +85°C
T
A
= –40
°C
to +85°C
V
IN
= V
MIN
to V
MAX
V
IN
= V
MIN
to V
MAX
R
LOAD
= 1.0KΩ
R
LOAD
=
∞
R
LOAD
= 1.0KΩ
T
A
= –40°C to +85°C
Min
—
—
2.5
—
—
40
1.4
—
86
97.5
—
—
Typ
180
0.1
—
—
160
80
—
—
93
99.96
17
—
Max
300
1.0
—
4.0
—
125
—
0.4
—
—
—
30
Units
µA
µA
V
V
kHz
kHz
V
V
%
%
Ω
NOTE: 1. Capacitor contribution is approximately 26% of the output impedance [ESR = 1 / pump frequency x capacitance)].
2. Switching frequency is one-half internal oscillator frequency.
PIN DESCRIPTION
Pin No.
(6-Pin SOT-23A)
1
2
3
4
5
6
Symbol
V
IN
GND
C–
SHDN
OUT
C+
Description
Power Supply Input.
Ground.
Commutation Capacitor Negative Terminal.
Shutdown Input (Active High).
Doubled Output Voltage.
Commutation Capacitor Positive Terminal.
TC1240-1 7/7/00
2
TELCOM [ TELCOM SEMICONDUCTOR, INC ]
