MAX1724EZK50+T Maxim Integrated Products, MAX1724EZK50+T Datasheet - Page 10

• Manufacturer Part Number: MAX1724EZK50+T
• Description: IC CONV DC-DC STEPUP 5V TSOT23-5
• Manufacturer: Maxim Integrated Products
• Type: Step-Up (Boost)r

Specifications of MAX1724EZK50+T

• Internal Switch(s): Yes
• Synchronous Rectifier: Yes
• Number Of Outputs: 1
• Voltage - Output: 5V
• Current - Output: 150mA
• Voltage - Input: 0.8 ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: TSOT-23-5, TSOT-5, TSOP-5
• Power - Output: 571mW
• Mounting Style: SMD/SMT
• Efficiency: 90 %
• Input / Supply Voltage (max): 5.5 V
• Input / Supply Voltage (min): 0.8 V
• Maximum Operating Temperature: + 85 C
• Maximum Power Dissipation: 571 mW
• Minimum Operating Temperature: - 40 C
• Operating Temperature Range: - 40 C to + 85 C
• Output Current: 150 mA
• Output Voltage: 5 V
• Supply Current: 1.5 uA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Frequency - Switching: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: MAX1724EZK50+TTR

1.5µA I
in Thin SOT23-5
10
For most applications, the peak inductor current equals
the current limit. However, for applications using large
inductor values or low input voltages, the maximum on-
time limits the peak inductor current (see Inductor
Selection section).
Choose input and output capacitors to supply the input
and output peak currents with acceptable voltage rip-
ple. The input filter capacitor (C
rents drawn from the battery and improves efficiency.
Low equivalent series resistance (ESR) capacitors are
recommended. Ceramic capacitors have the lowest
ESR, but low ESR tantalum or polymer capacitors offer
a good balance 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 capaci-
tor:
Table 2. Suggested Surface-Mount Capacitors and Manufacturers (C1 and C2)
MANUFACTURER
AVX
Kemet
Sanyo
Taiyo Yuden
TDK
Vishay Sprague
V
V
V
______________________________________________________________________________________
RIPPLE
RIPPLE ESR
RIPPLE C
(
( )
=
V
≈
)
RIPPLE C
2
≈
1
Q



I
PEAK
(
V
, Step-Up DC-DC Converters
( )
OUT
+
R
-
ESR COUT
V
10µF to 330µF
10µF to 330µF
68µF to 330µF
33µF to 330µF
33µF to 330µF
10µF to 330µF
CAPACITOR
V
1µF to 10µF
1µF to 22µF
1µF to 10µF
RIPPLE ESR
BATT
L
VALUE
(
Capacitor Selection
)
(
C
IN
)
OUT
) reduces peak cur-
)



(
I
PEAK
2
-
I
OUT
594D Tantalum Series
595D Tantalum Series
T494 Tantalum Series
T520 Tantalum Series
TAJ Tantalum Series
TPS Tantalum Series
TPC Polymer Series
2
X5R/X7R Ceramic
X5R/X7R Ceramic
)
DESCRIPTION
X7R Ceramic
X7R Ceramic
where I
Selection section). For ceramic capacitors, the output
voltage ripple is typically dominated by V
example, a 10µF ceramic capacitor and a 10µH induc-
tor typically provide 75mV of output ripple when step-
ping up from 3.3V to 5V at 50mA. Low input-to-output
voltage differences (i.e. two cells to 3.3V) require high-
er 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.
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,
(MAX1722/MAX1723 only) and LX as short as possible.
TRANSISTOR COUNT: 863
PC Board Layout Considerations
PEAK
is the peak inductor current (see Inductor
keep
all
www.avxcorp.com
www.t-yuden.org
www.vishay.com
www.kemet.com
www.secc.co.jp
Chip Information
connections
843-448-9411
864-963-6300
408-749-9714
800-368-2496
847-803-6100
203-452-5664
www.tdk.com
WEBSITE
PHONE
RIPPLE(C)
to
. For
FB