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PDF MAX1723 Data sheet ( Hoja de datos )
| Número de pieza | MAX1723 | |
| Descripción | Step-Up DC-DC Converters | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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MAX1722/MAX1723/
MAX1724
1.5μA IQ, Step-Up DC-DC
Converters in TSOT and µDFN
General Description
The MAX1722/MAX1723/MAX1724 compact, high-efficiency,
step-up DC-DC converters are available in tiny, 5-pin
TSOT packages. They feature an extremely low 1.5μA
quiescent supply current to ensure the highest possible
light-load efficiency. Optimized for operation from one
to two alkaline or nickel-metal-hydride (NiMH) cells, or
a single Li+ cell, these devices are ideal for applications
where extremely low quiescent current and ultra-small
size are critical.
Built-in synchronous rectification significantly improves
efficiency and reduces size and cost by eliminating the
need for an external Schottky diode. All three devices
feature a 0.5Ω N-channel power switch. The MAX1722/
MAX1724 also feature proprietary noise-reduction circuitry,
which suppresses electromagnetic interference (EMI)
caused by the inductor in many step-up applications. The
family offers different combinations of fixed or adjustable
outputs, shutdown, and EMI reduction (see Selector
Guide).
Applications
●● Pagers
●● Remote Controls
●● Remote Wireless
Transmitters
●● Personal
Medical Devices
●● Digital Still Cameras
●● Single-Cell Battery-
Powered Devices
●● Low-Power Hand-Held
Instruments
●● MP3 Players
●● Personal Digital
Assistants (PDA)
Benefits and Features
●● Up to 90% Efficiency
●● No External Diode or FETs Needed
●● 1.5μA Quiescent Supply Current
●● 0.1μA Logic-Controlled Shutdown
●● ±1% Output Voltage Accuracy
●● Fixed Output Voltage (MAX1724) or Adjustable
Output Voltage (MAX1722/MAX1723)
●● Up to 150mA Output Current
●● 0.8V to 5.5V Input Voltage Range
●● 0.91V Guaranteed Startup (MAX1722/MAX1724)
●● Internal EMI Suppression (MAX1722/MAX1724)
●● TSOT Package (0.9mm typ Height)
●● µDFN Package (2mm x 2mm x 0.75mm)
Ordering Information and Selector Guide appears at end of
data sheet.
Typical Operating Circuit
10µH
IN
0.8V TO 5.5V
BATT
LX
ON
OFF
MAX1724
SHDN
GND
OUT
OUT
3.3V AT
UP TO 150mA
19-1735; Rev 4; 5/16
1 page  
MAX1722/MAX1723/
MAX1724
1.5μA IQ, Step-Up DC-DC
Converters in TSOT and µDFN
Typical Operating Characteristics (continued)
(Figure 3 (MAX1723), Figure 7 (MAX1722), Figure 8 (MAX1724), VBATT = VIN = 1.5V, L = 10μH, CIN = 10μF, COUT = 10μF, TA = +25°C,
unless otherwise noted.)
LOAD-TRANSIENT RESPONSE
SHUTDOWN RESPONSE
3.3V
50mA
0
200µs/div
A: VOUT, 50mV/div
B: IOUT, 20mA/div
5V
A
0
2V
B
0
1ms/div
VIN = 3.3V, VOUT = 5.0V, ROUT = 100Ω
SHUTDOWN INPUT THRESHOLD
vs. TEMPERATURE
0.8
0.7
0.6
RISING EDGE
0.5
0.4
FALLING EDGE
0.3
0.2
0.1
0
-40
-15 10 35 60
TEMPERATURE (°C)
85
VOUT
2V/div
VSHDN
1V/div
www.maximintegrated.com
Maxim Integrated │ 5
5 Page 
MAX1722/MAX1723/
MAX1724
1.5μA IQ, Step-Up DC-DC
Converters in TSOT and µDFN
Table 2. Suggested Surface-Mount Capacitors and Manufacturers (C1 and C2)
MANUFACTURER
AVX
Kemet
Sanyo
Taiyo Yuden
TDK
Vishay Sprague
CAPACITOR
VALUE
1µF to 10µF
10µF to 330µF
1µF to 22µF
10µF to 330µF
68µF to 330µF
33µF to 330µF
33µF to 330µF
1µF to 10µF
10µF to 330µF
DESCRIPTION
X7R Ceramic
TAJ Tantalum Series
TPS Tantalum Series
X5R/X7R Ceramic
T494 Tantalum Series
T520 Tantalum Series
TPC Polymer Series
X5R/X7R Ceramic
X7R Ceramic
594D Tantalum Series
595D Tantalum Series
PHONE
WEBSITE
843-448-9411
www.avxcorp.com
864-963-6300
www.kemet.com
408-749-9714
www.secc.co.jp
800-368-2496
www.t-yuden.org
847-803-6100
www.tdk.com
203-452-5664
www.vishay.com
For most applications, the peak inductor current equals
the current limit. However, for applications using large
inductor values or low input voltages, the maximum
ontime limits the peak inductor current (see Inductor
Selection section).
Capacitor Selection
Choose input and output capacitors to supply the input
and output peak currents with acceptable voltage ripple.
The input filter capacitor (CIN) reduces peak currents
drawn from the battery and improves efficiency. Low
equivalent series resistance (ESR) capacitors are recom-
mended. Ceramic capacitors have the lowest ESR, but
low ESR tantalum or polymer capacitors offer a good bal-
ance between cost and performance.
Output voltage ripple has two components: variations in
the charge stored in the output capacitor with each LX
pulse, and the voltage drop across the capacitor’s ESR
caused by the current into and out of the capacitor:
=VRIPPLE VRIPPLE(C) + VRIPPLE(ESR)
VRIPPLE(ESR) ≈ IPEAK RESR(COUT)
( )VRIPPLE(C)
≈
21
(VOUT
L
-VBATT
)C
OUT
IPEAK 2 -IOUT 2
wSehleercetioIPnEAseKctisionth).e
peak inductor current (see Inductor
For ceramic capacitors, the output
voltage ripple is typically dominated by VRIPPLE(C). For
example, a 10μF ceramic capacitor and a 10μH inductor
typically provide 75mV of output ripple when stepping up
from 3.3V to 5V at 50mA. Low input-to-output voltage
differences (i.e. two cells to 3.3V) require higher output
capacitor values.
Capacitance and ESR variation of temperature should be
considered for best performance in applications with wide
operating temperature ranges. Table 2 lists suggested
capacitors and suppliers.
PC Board Layout Considerations
Careful PC board layout is important for minimizing
ground bounce and noise. Keep the IC’s GND pin and the
ground leads of the input and output capacitors less than
0.2in (5mm) apart using a ground plane. In addition, keep
all connections to FB (MAX1722/MAX1723 only) and LX
as short as possible.
www.maximintegrated.com
Maxim Integrated │ 11
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet MAX1723.PDF ] | |
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