MAX1709ESE Maxim Integrated Products, MAX1709ESE Datasheet - Page 7

• Manufacturer Part Number: MAX1709ESE
• Description: IC DC/DC CONV STEP-UP 4A 16-SOIC
• Manufacturer: Maxim Integrated Products
• Type: Step-Up (Boost)r

Specifications of MAX1709ESE

• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: 3.3V, 5V, Adj
• Current - Output: 4A
• Frequency - Switching: 600kHz
• Voltage - Input: 0.7 ~ 5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 16-SOIC (3.9mm Width)
• Power - Output: 1.3W
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: Q1226679

9, 10, 17,
TSSOP
11, 14
24, 25
18–23
2–8
12
13
15
16
26
27
28
EP
1
PIN
NARROW SO
_______________________________________________________________________________________
11, 12, 13
2, 3, 4
5, 8
10
14
15
16
—
—
1
6
7
9
SS/LIM
NAME
PGND
ONA
GND
3.3/5
ONB
OUT
N.C.
CLK
REF
LX
FB
EP
4A, Low-Noise, High-Frequency,
On-Control Input. When ONA = high OR ONB = low, the device turns on
Drain of n-Channel Power Switch. Connect pins 2, 3, and 4 together.
Connect external Schottky diode from LX to OUT.
Ground. Connect ground inputs together, then connect to PGND.
Soft-Start and/or Current-Limit Input. Connect a capacitor from SS/LIM to
GND to control the rate at which the device reaches current limit (soft-start).
To reduce the current limit from the preset values, connect a resistor from
SS/LIM to GND (see Design Procedure). During shutdown, this pin is
internally pulled to GND to discharge the soft-start capacitor.
1.26V Voltage Reference Output. Bypass with a 0.22µF capacitor to GND.
Maximum REF load is 50µA.
Output Voltage Sense Input. The device is powered from OUT. Bypass with
a 0.1µF to PGND with less than 5mm trace length. Connect a 2Ω series
resistor from the output filter capacitor to OUT (Figure 1).
DC-DC Converter Feedback Input. Connect FB to GND for internally set
output voltage (see 3.3/5 pin description). Connect a resistor-divider from
the output to set the output voltage in the +2.5V to +5.5V range. FB
regulates to +1.25V (Figure 4).
Power Ground. Source of n-channel power MOSFET switch. Connect PGND
inputs together, then connect to GND.
Output Voltage Selection Pin. When FB is connected to GND, the regulator
uses internal feedback to set the output voltage. 3.3/5 = low sets output to
3.3V; 3.3/5 = high sets output to 5V. If an external divider is used at FB,
connect 3.3/5 to ground.
Clock Input for the DC-DC Converter. Connect to OUT for internal oscillator.
Optionally, drive with an external clock for external synchronization.
Shutdown Input. When ONB = high AND ONA = low, the device turns off
(Table 1).
No Connect. Not internally connected.
Exposed Pad. Connect to large ground plane for maximum thermal
dissipation.
Step-Up DC-DC Converter
FUNCTION
Pin Description
7