Datasheet

 2001-2012 Microchip Technology Inc. DS21516D-page 3
TC1240/TC1240A
TC1240A ELECTRICAL SPECIFICATIONS
Electrical Specifications: Unless otherwise noted, typical values apply at T
A
= +25°C. Minimum and maximum
values apply for T
A
= -40° to +85°C, and V
IN
= +5.0V, C
1
= C
2
= 3.3 µF, SHDN = GND.
Parameters Sym Min Typ Max Units Conditions
Supply Current I
DD
— 550 900 µA R
LOAD
= 
Shutdown Supply Current I
SHDN
— 0.01 1.0 µA SHDN = V
IN
Minimum Supply Voltage V
MIN
2.5 — — V
Maximum Supply Voltage V
MAX
——5.5V
Output Current I
LOAD
20 — — mA
Sum of the R
DS(ON)
of the
internal MOSFET Switches
R
SW
—4 8 I
LOAD
= 20 mA
Oscillator Frequency F
OSC
—160—kHzT
A
= -40°C to +85°C
Switching Frequency (Note 1) F
SW
40 80 125 kHz T
A
= -40°C to +85°C
Shutdown Input Logic High V
IH
1.4 — — V V
IN
= V
MIN
to V
MAX
Shutdown Input Logic Low V
IL
——0.4VV
IN
= V
MIN
to V
MAX
Power Efficiency P
EFF
86 94 — % I
LOAD
= 5 mA
Voltage Conversion Efficiency V
EFF
99 99.96 — % R
LOAD
= 
Output Resistance (Note 2) R
OUT
—
—
12
—
—
25
 I
LOAD
= 20 µA
T
A
= -40°C to +85°C
Note 1: Switching frequency is one-half internal oscillator frequency.
2: Capacitor contribution is approximately 26% of the output impedance [ESR = 1 / switching frequency x
capacitance].