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PDF MAX1643 Data sheet ( Hoja de datos )
| Número de pieza | MAX1643 | |
| Descripción | Step-Up DC-DC Converters | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MAX1643 (archivo pdf) en la parte inferior de esta página. Total 12 Páginas | ||
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19-1183; Rev 0; 6/97
EVFAOLLULAOTWIOSNDKAITTAMSAHNEUEATL
High-Efficiency, Step-Up
DC-DC Converters for 1V Inputs
_______________General Description
The MAX1642/MAX1643 are high-efficiency, low-voltage,
step-up DC-DC converters intended for devices pow-
ered by a single alkaline cell. They feature low quies-
cent supply currents and are supplied in the ultra-small
µMAX package, which is only 1.1mm high. The guaran-
teed start-up voltage is 0.88V.
Each device consists of an internal 1Ω, N-channel
MOSFET power switch; a built-in synchronous rectifier
that acts as the catch diode; an oscillator; a reference;
and pulse-frequency-modulation (PFM) control circuitry.
Both devices feature an independent undervoltage
comparator (PFI/PFO). The MAX1642 also includes a
2µA logic-controlled shutdown mode. The MAX1643
offers a dedicated low-battery detector (BATTLO) in
lieu of shutdown.
The output voltage for each device is preset to 3.3V
±4%, or can be adjusted from +2V to +5.2V using only
two resistors.
________________________Applications
Pagers
Remote Controls
Pointing Devices
Personal Medical Monitors
Single-Cell Battery-Powered Devices
____________________________Features
o Built-In Synchronous Rectifier
o 0.88V Guaranteed Start-Up
o Ultra-Small µMAX Package: 1.1mm High
o 83% Efficiency
o 4µA Quiescent Supply Current into BATT Pin
o 2µA Logic-Controlled Shutdown (MAX1642)
o Two Undervoltage Detectors (MAX1643)
o 2V to 5.2V Output Range
o 20mA Output Current at 1.2V Input
o Reverse Battery Protection
______________Ordering Information
PART
MAX1642C/D
MAX1642EUA
MAX1643C/D
MAX1643EUA
TEMP. RANGE
0°C to +70°C
-40°C to +85°C
0°C to +70°C
-40°C to +85°C
PIN-PACKAGE
Dice*
8 µMAX
Dice*
8 µMAX
*Dice are tested at TA = +25°C.
Note: To order these devices shipped in tape and reel, add a -T
to the part number.
_________________Pin Configurations
TOP VIEW
__________Typical Operating Circuit
INPUT
0.88V TO 1.65V 100µH
22µF
ON
OFF
LOW-BATTERY
DETECTOR INPUT
LX OUT
MAX1642
BATT
SHDN
PFI
GND
PFO
FB
OUTPUT
3.3V
22µF
LOW-BATTERY
DETECTOR OUTPUT
BATT 1
PFI 2
PFO 3
SHDN 4
MAX1642
8 OUT
7 LX
6 GND
5 FB
µMAX
BATT 1
PFI 2
BATTLO 3
PFO 4
MAX1643
8 OUT
7 LX
6 GND
5 FB
µMAX
________________________________________________________________ Maxim Integrated Products 1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 408-737-7600 ext. 3468.
http://www.Datasheet4U.com
1 page  
High-Efficiency, Step-Up
DC-DC Converters for 1V Inputs
____________________________Typical Operating Characteristics (continued)
(Circuit of Figure 4, VBATT = 1.2V, R1 + R2 = 1MΩ, TA = +25°C, unless otherwise noted.)
MAXIMUM OUTPUT CURRENT
vs. INPUT VOLTAGE
35
30 VOUT = 2.4V
25
20
15
VOUT = 3.3V VOUT = 5V
10
5 L1 = 100µH
SUMIDA CD54-101
0
0.8 0.9 1.0 1.1 1.2 1.3 1.4
INPUT VOLTAGE (V)
1.5
1.6
MAXIMUM OUTPUT CURRENT
vs. INPUT VOLTAGE
20
18 VOUT = 2.4V
16
14
12 VOUT = 3.3V
10
8 VOUT = 5V
6
4
L1 = 150µH
2 TDK NLC565050T-151K
0
0.8 0.9 1.0 1.1 1.2 1.3 1.4 1.5
INPUT VOLTAGE (V)
1.6
SWITCHING WAVEFORMS
A
B
C
10ms/div
VOUT = 3.3V, VIN = 1.2V, IOUT = 12mA
A: LX, 2V/div, L1 = TDK NLC565050T-151K
B: OUT, 20mV/div, 3.3V DC OFFSET
C: INDUCTOR CURRENT, 100mA/div
LOAD-TRANSIENT RESPONSE
LINE-TRANSIENT RESPONSE
SHUTDOWN RESPONSE AND
INDUCTOR CURRENT
A
B
400µs/div
VOUT = 3.3V, VBATT = 1.2V
A: OUT, 20mV/div, 3.3V DC OFFSET
B: LOAD, 2mA to 20mA, 10mA/div
A
B
400µs/div
VOUT = 3.3V, LOAD = 15mA
A: OUT, 50mV/div, 3.3V DC OFFSET
B: VBATT, 1V to 1.5V, 500mV/div
A
B
C
10ms/div
VOUT = 3.3V, VBATT = 1.2V, IOUT = 5mA
A: OUT, 1V/div
B: INDUCTOR CURRENT, 200mA/div
C: SHDN, 2V/div
_______________________________________________________________________________________ 5
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5 Page 
High-Efficiency, Step-Up
DC-DC Converters for 1V Inputs
________________________________________________________Package Information
______________________________________________________________________________________ 11
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| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet MAX1643.PDF ] | |
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