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参数资料
| 型号： | TC1237EUNRT |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHED CAPACITOR CONVERTER, 170 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封装： | MSOP-10 |
| 文件页数： | 3/10页 |
| 文件大小： | 1046K |
| 代理商： | TC1237EUNRT |
2
Inverting Dual (–VIN, –2VIN)
Charge Pump Voltage Converters
with Shutdown
TC1235
TC1236
TC1237
TC1235/6/7-1 3/24/00
2001 Microchip Technology Inc.
DS21371A
Power Dissipation (TA ≤ 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.
ABSOLUTE MAXIMUM RATINGS*
Input Voltage (VIN to GND) ......................... +6.0V, – 0.3V
Output Voltage (–VIN, –2VIN to GND) ........ –12.0V, + 0.3V
Current at –VIN, –2VIN Pins ...................................... 10mA
Short-Circuit Duration –VIN, –2VIN to GND ........ Indefinite
Operating Temperature Range ............... – 40
°C to +85°C
PIN DESCRIPTION
Pin Number
Name
Description
1C1–
C1 Commutation Capacitor Negative Terminal.
2
C2+
C2 Commutation Capacitor Positive Terminal.
3
NC
No Connection.
4C2–
C2 Commutation Capacitor Negative Terminal.
5
–2VIN
Doubling Inverting Charge Pump Output (–2 x VIN).
6
GND
Ground.
7VIN
Positive Power Supply Input.
8
SHDN
Shutdown Input (Active Low).
9
C1+
C1 Commutation Capacitor Positive Terminal.
10
–VIN
Inverting Charge Pump Output (–1 x VIN).
NOTES: 1. Capacitor contribution is approximately 20% of the output impedance [ESR = 1 / pump frequency x capacitance)].
ELECTRICAL CHARACTERISTICS: TA = –40°C to +85°C, VIN = +5V, C1 = 3.3F, C2 = 1F (TC1235); C1 = 1F, C2
= 0.33
F (TC1236); C1 = 0.33F, C2 = 0.1F (TC1237), SHDN = VIN, unless otherwise noted. Typical values are at TA = +25°C.
Symbol Parameter
Device
Test Conditions
Min
Typ
Max
Unit
IDD
Supply Current
TC1235
SHDN = VIN
—
75
120
A
TC1236
SHDN = VIN
—
200
360
TC1237
SHDN = VIN
—
625
1500
ISHDN
Shutdown Supply Current All
SHDN = GND, VIN = +5V
—
0.1
1
A
VMIN
Minimum Supply Voltage All
RLOAD = 1k for –VIN output
1.8
——
V
RLOAD = 10k for –2VIN output
VMAX
Maximum Supply Voltage All
RLOAD = 1k for –VIN output
——
5.5
V
RLOAD = 10k for –2VIN output
FOSC
Oscillator Frequency
TC1235
8.4
12
15.6
kHz
TC1236
24.5
35
45.5
TC1237
65
125
170
VIH
Shutdown Input
All
VIN = VMIN to VMAX
1.4
——
V
Logic High
VIL
Shutdown Input
All
VIN = VMIN to VMAX
——
0.4
V
Logic low
VEFF1
Voltage Conversion
All
RLOAD = ∞ for –VIN output
96
99.5
—
%
Efficiency (Stage 1)
RLOAD = ∞ for –2VIN output
VEFF2
Voltage Conversion
All
RLOAD = ∞ for –VIN output
94
99
—
%
Efficiency (Stage 2)
RLOAD = ∞ for –2VIN output
ROUT1
Output Resistance
All
ILOAD = 0.5mA to 5mA
—
45
80
for –VIN output (Note 1)
No Load at -VIN Output
ROUT2
Output Resistance
All
ILOAD = 0.1mA to 1mA
—
135
420
for –2VIN output (Note 1)
No Load at -2VIN Output
TWK1
Wake-Up Time
TC1235
RLOAD = 1k for -VIN Output
—
650
—
sec
From Shutdown Mode
TC1236
RLOAD = 10k for -2VIN Output
—
250
—
Stage 1
TC1237
—
100
—
TWK2
Wake-Up Time
TC1235
RLOAD = 1k for -VIN Output
—
750
—
sec
From Shutdown Mode
TC1236
RLOAD = 10k for -2VIN Output
—
280
—
Stage 2
TC1237
—
120
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