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PDF LM2685MTCX Data sheet ( Hoja de datos )
| Número de pieza | LM2685MTCX | |
| Descripción | Dual Output Regulated Switched Capacitor Voltage Converter | |
| Fabricantes | National Semiconductor | |
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May 2000
LM2685
Dual Output Regulated Switched Capacitor Voltage
Converter
General Description
The LM2685 CMOS charge-pump voltage converter oper-
ates as an input voltage doubler, +5V regulator and inverter
for an input voltage in the range of +2.85V to +6.5V. Five low
cost capacitors are used in this circuit to provide up to 50mA
of output current at +5V (± 5%), and 15mA at −5V. The
LM2685 operates at a 130 kHz switching frequency to re-
duce output resistance and voltage ripple. With an operating
current of only 800µA (operating efficiency greater than 80%
with most loads) and 6µA typical shutdown current, the
LM2685 is ideal for use in battery powered systems. The de-
vice is in a small 14-pin TSSOP package.
Features
n +5V regulated output
n Inverts V05(+5V) to VNEG(−5V)
n Doubles input supply voltage
n TSSOP-14 package
n 80% typical conversion efficiency at 25mA
n Input voltage range of 2.85V to 6.5V
n Independent shutdown control pins
Applications
n Cellular phones
n Pagers
n PDAs
n Handheld instrumentation
n 3.3V to 5V voltage conversion applications
Typical Application and Connection Diagram
Ordering Information
Order Number
LM2685MTC
LM2685MTCX
Package Type
TSSOP-14
TSSOP-14
DS101100-1
NSC Package
Drawing
MTC14
MTC14
DS101100-2
14-Pin TSSOP
Supplied As
94 Units, Rail
2.5k Units, Tape and Reel
© 2000 National Semiconductor Corporation DS101100
www.national.com
1 page  
Typical Performance Characteristics Unless otherwise specified, TA = 25˚C, VIN =
3.6V. (Continued)
Line Transient Response (with 5mA
Load)
V05 Load Transient Response
VNSW Load Transient Response
DS101100-14
A: INPUT VOLTAGE: VIN = 3.2V to 6.0V, 5V/div
B: OUTPUT VOLTAGE: VPSW: 100mV/div
C: OUTPUT VOLTAGE: VNSW: 100mV/div
DS101100-15
A: LOAD CURRENT: ILOAD = 5mA to 39.6mA,
10mA/div
B: OUTPUT VOLTAGE: V05: 10mV/div
VPSW and VNSW Response to CE
(with 5mA Load)
V05 Response to SDP (with 5mA
Load)
DS101100-16
A: LOAD CURRENT: ILOAD = 4.4mA to −9.4mA,
10mA/div
B: OUTPUT VOLTAGE: VNSW: 50mV/div
VNSW Response to SDP (with 5mA
Load)
DS101100-17
A: CE INPUT: 5V/div
B: OUTPUT VOLTAGE: VPSW: 5V/div
C: OUTPUT VOLTAGE: VNSW: 5V/div
VNSW Response to SDN
(with 5mA Load)
A: SDP INPUT: 5V/div
B: OUTPUT VOLTAGE: 5V/div
DS101100-18
DS101100-19
A: SDP INPUT: 5V/div
B: OUTPUT VOLTAGE (VNSW): 5V/div
DS101100-20
A: SDN INPUT: 5V/div
B: OUTPUT VOLTAGE (VNSW): 5V/div
5
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5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet LM2685MTCX.PDF ] | |
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