156869 Datasheet, PDF (2/9 Pages) Texas Instruments – Switched Capacitor Voltage Converter

Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Supply Voltage (V+ to GND, or GND to OUT)
5.8V
SD
(GND − 0.3V) to (V+ +
0.3V)
V+ and OUT Continuous Output Current
50 mA
Output Short-Circuit Duration to GND (Note 2) 1 sec.
Continuous Power
600 mW
Dissipation (T_A = 25˚C)(Note 3)
T_JMax(Note 3)
θ_JA (Note 3)
Operating Junction
Temperature Range
Storage Temperature Range
Lead Temp. (Soldering, 10 seconds)
ESD Rating
150˚C
210˚C/W
−40˚ to 85˚C
−65˚C to +150˚C
300˚C
2kV
Electrical Characteristics
Limits in standard typeface are for T_J = 25˚C, and limits in boldface type apply over the full operating temperature range. Un-
less otherwise specified: V+ = 5V, C₁ = C₂ = 3.3 µF. (Note 4)
Symbol
Min
Typ
Max
Parameter
Condition
(Note 5) (Note 6) (Note 5) Units
V+
Supply Voltage
1.8
5.5
V
I_Q
Supply Current
No Load
I_SD
Shutdown Supply Current
V_SD
Shutdown Pin Input Voltage
Normal Operation
Shutdown Mode
220
1
2.0
(Note 7)
500
µA
µA
V
0.8
(Note 8)
I_L
R_SW
Output Current
Sum of the R_ds(on)of the four
internal MOSFET switches
I_L = 40 mA
40
4
mA
8
Ω
R_OUT
f_OSC
f_SW
P_EFF
Output Resistance (Note 9)
Oscillator Frequency
Switching Frequency
Power Efficiency
I_L = 40 mA
(Note 10)
(Note 10)
R_L (1.0k) between GND and
OUT
12
25
Ω
80
160
kHz
40
80
kHz
90
94
%
I_L = 40 mA to GND
91
V_OEFF
Voltage Conversion Efficiency No Load
99
99.96
%
Note 1: Absolute maximum ratings indicate limits beyond which damage to the device may occur. Electrical specifications do not apply when operating the device
beyond its rated operating conditions.
Note 2: OUT may be shorted to GND for one second without damage. However, shorting OUT to V+ may damage the device and should be avoided. Also, for
temperatures above 85˚C, OUT must not be shorted to GND or V+, or device may be damaged.
Note 3: The maximum allowable power dissipation is calculated by using P_DMax = (T_JMax − T_A)/θ_JA, where T_JMax is the maximum junction temperature, T_A is the
ambient temperature, and θ_JA is the junction-to-ambient thermal resistance of the specified package.
Note 4: In the test circuit, capacitors C₁ and C₂ are 3.3 µF, 0.3Ω maximum ESR capacitors. Capacitors with higher ESR will increase output resistance, reduce
output voltage and efficiency.
Note 5: Min. and Max. limits are guaranteed by design, test, or statistical analysis.
Note 6: Typical numbers are not guaranteed but represent the most likely norm.
Note 7: The minimum input high for the shutdown pin equals 40% of V+.
Note 8: The maximum input low for the shutdown pin equals 20% of V+.
Note 9: Specified output resistance includes internal switch resistance and capacitor ESR. See the details in the application information for simple negative voltage
converter.
Note 10: The output switches operate at one half of the oscillator frequency, f_OSC = 2f_SW.
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