Positive Doubling Charge Pump with
Shutdown in SOT Package
TC1240
*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.
ABSOLUTE MAXIMUM RATINGS*
Input Voltage (VIN to GND) .......................... +4.5V, –0.3V
Output Voltage (OUT to GND) .............. +9.0V, VIN – 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 (TA ≤ 70°C)
6-Pin SOT-23A ..........................................240 mW
Storage Temperature (Unbiased) ......... –65 °C to +150°C
Lead Temperature (Soldering, 10 sec) ................. +300°C
ELECTRICAL CHARACTERISTICS: TA = –40 to +85 °C, VIN = +2.8V, C1 = C2 = 3.3µF , SHDN = GND,
unless otherwise noted. Typical values are at TA = +25°C.
Symbol
Parameter
Test Conditions
RLOAD =
Min
Typ
Max
Units
IDD
Supply Current
∞
—
—
180
0.1
—
300
1.0
—
µA
µA
V
ISHDN
VMIN
VMAX
FOSC
FSW
VIH
Shutdown Supply Current
Minimum Supply Voltage
Maximum Supply Voltage
Oscillator Frequency
Switching Frequency
Shutdown Input Logic High
Shutdown Input Logic Low
Power Efficiency
SHDN = VIN
RLOAD = 1.0KΩ
RLOAD = 1.0KΩ
TA = –40 °C to +85°C
TA = –40 °C to +85°C
VIN = VMIN to VMAX
VIN = VMIN to VMAX
RLOAD = 1.0KΩ
RLOAD = ∞
2.5
—
—
4.0
—
V
—
160
80
kHz
kHz
V
40
125
—
1.4
—
—
VIL
—
0.4
—
V
PEFF
VEFF
86
93
%
Voltage Conversion
Efficiency
97.5
99.96
—
%
ROUT
Output Resistance
(Note 1)
RLOAD = 1.0KΩ
TA = –40°C to +85°C
—
—
17
—
—
30
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)
Symbol
Description
1
2
3
4
5
6
VIN
GND
C –
Power Supply Input.
Ground.
Commutation Capacitor Negative Terminal.
Shutdown Input (Active High).
Doubled Output Voltage.
SHDN
OUT
C+
Commutation Capacitor Positive Terminal.
TC1240-1 7/7/00
2
TELCOM [ TELCOM SEMICONDUCTOR, INC ]
