TC1235 Datasheet, PDF (2/10 Pages) Microchip Technology – Inverting Dual (-VIN, -2VIN) Charge Pump Voltage Converters with Shutdown

TC1235
TC1236
TC1237
Inverting Dual (–V_IN, –2V_IN)
Charge Pump Voltage Converters
with Shutdown
ABSOLUTE MAXIMUM RATINGS*
Input Voltage (V_IN to GND) ......................... +6.0V, – 0.3V
Output Voltage (–V_IN, –2V_IN to GND) ........ –12.0V, + 0.3V
Current at –V_IN, –2V_IN Pins ...................................... 10mA
Short-Circuit Duration –V_IN, –2V_IN to GND ........ Indefinite
Operating Temperature Range ............... – 40°C to +85°C
Power Dissipation (T_A ≤ 70°C) MSOP-10 ............. 320mW
Storage Temperature (Unbiased) ......... – 65°C to +150°C
Lead Temperature (Soldering, 10sec) .................. +260°C
*This is a stress rating 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°C to +85°C, V_IN = +5V, C1 = 3.3µF, C2 = 1µF (TC1235); C1 = 1µF, C2
= 0.33µF (TC1236); C1 = 0.33µF, C2 = 0.1µF (TC1237), SHDN = V_IN, unless otherwise noted. Typical values are at T_A = +25°C.
Symbol Parameter
Device Test Conditions
Min Typ Max Unit
I_DD
I_SHDN
V_MIN
V_MAX
F_OSC
Supply Current
TC1235
TC1236
TC1237
Shutdown Supply Current All
Minimum Supply Voltage All
Maximum Supply Voltage All
Oscillator Frequency
TC1235
TC1236
TC1237
SHDN = V_IN
SHDN = V_IN
SHDN = V_IN
SHDN = GND, V_IN = +5V
R_LOAD = 1kΩ for –V_IN output
R_LOAD = 10kΩ for –2V_IN output
R_LOAD = 1kΩ for –V_IN output
R_LOAD = 10kΩ for –2V_IN output
—
75
—
200
—
625
—
0.1
1.8
—
—
—
8.4
12
24.5
35
65
125
V_IH
Shutdown Input
All
V_IN = V_MIN to V_MAX
Logic High
1.4
—
V_IL
V_EFF1
V_EFF2
R_OUT1
R_OUT2
T_WK1
Shutdown Input
Logic low
Voltage Conversion
Efficiency (Stage 1)
Voltage Conversion
Efficiency (Stage 2)
Output Resistance
for –V_IN output (Note 1)
Output Resistance
for –2V_IN output (Note 1)
Wake-Up Time
From Shutdown Mode
Stage 1
All
All
All
All
All
TC1235
TC1236
TC1237
V_IN = V_MIN to V_MAX
R_LOAD = ∞ for –V_IN output
R_LOAD = ∞ for –2V_IN output
R_LOAD = ∞ for –V_IN output
R_LOAD = ∞ for –2V_IN output
I_LOAD = 0.5mA to 5mA
No Load at -V_IN Output
I_LOAD = 0.1mA to 1mA
No Load at -2V_IN Output
R_LOAD = 1kΩ for -V_IN Output
R_LOAD = 10kΩ for -2V_IN Output
—
—
96
99.5
94
99
—
45
—
135
—
650
—
250
—
100
T_WK2
Wake-Up Time
From Shutdown Mode
Stage 2
TC1235
TC1236
TC1237
R_LOAD = 1kΩ for -V_IN Output
R_LOAD = 10kΩ for -2V_IN Output
—
750
—
280
—
120
NOTES: 1. Capacitor contribution is approximately 20% of the output impedance [ESR = 1 / pump frequency x capacitance)].
120
360
1500
1
—
5.5
15.6
45.5
170
—
0.4
—
—
80
420
—
—
—
—
—
µA
µA
V
V
kHz
V
V
%
%
Ω
Ω
µsec
µsec
PIN DESCRIPTION
Pin Number
1
2
3
4
5
6
7
8
9
10
Name
C1–
C2+
NC
C2–
–2V_IN
GND
V_IN
SHDN
C1+
–V_IN
Description
C1 Commutation Capacitor Negative Terminal.
C2 Commutation Capacitor Positive Terminal.
No Connection.
C2 Commutation Capacitor Negative Terminal.
Doubling Inverting Charge Pump Output (–2 x V_IN).
Ground.
Positive Power Supply Input.
Shutdown Input (Active Low).
C1 Commutation Capacitor Positive Terminal.
Inverting Charge Pump Output (–1 x V_IN).
TC1235/6/7-1 3/24/00
2
© 2001 Microchip Technology Inc. DS21371A