MAX1724EZK50+T Maxim Integrated Products, MAX1724EZK50+T Datasheet - Page 7

• 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

up voltage is a function of load current (see Typical
Operating Characteristics). This circuit is powered from
the BATT pin for the MAX1722/MAX1724, guaranteeing
startup at input voltages as low as 0.91V. The MAX1723
Figure 2. MAX1724 Simplified Functional Diagram
Figure 3. MAX1723 Single-Cell Operation
1.2V TO V
10µF
OUT
BATT
SHDN
R
R
SHDN
GND
_______________________________________________________________________________________
2
1
MAX1723
10
µ
H
1.235V REFERENCE
OUT
1.5µA I
FB
LX
ERROR
COMPARATOR
MAX1724
R2
2.37MΩ
R1
1.24MΩ
D1
V
OUT
Q
CIRCUITRY
STARTUP
10µF
= 3.6V
, Step-Up DC-DC Converters
CONTROL
LOGIC
DAMPING
SWITCH
lacks a BATT pin; therefore, this circuit is powered
through the OUT pin. Adding a Schottky diode in paral-
lel with the P-channel synchronous rectifier allows for
startup voltages as low as 1.2V for the MAX1723
(Figure 3). The external Schottky diode is not needed
for input voltages greater than 1.8V. Once started, the
output maintains the load as the battery voltage
decreases below the startup voltage.
The MAX1723/MAX1724 enter shutdown when the
SHDN pin is driven low. During shutdown, the body
diode of the P-channel MOSFET allows current to flow
from the battery to the output. V
mately V
Shutdown can be pulled as high as 6V, regardless of
the voltage at BATT or OUT. For normal operation, con-
nect SHDN to the input.
IN
CURRENT
DRIVER
- 0.6V and LX remains high impedance.
LIMIT
Shutdown (MAX1723/MAX1724)
CROSSING
DETECTOR
in Thin SOT23-5
ZERO-
GND
P
N
OUT
falls to approxi-
OUT
LX
7