MAX15017BATX+ Maxim Integrated Products, MAX15017BATX+ Datasheet - Page 12

• Manufacturer Part Number: MAX15017BATX+
• Description: IC DC/DC CONV 1A 36-TQFN-EP
• Manufacturer: Maxim Integrated Products
• Type: Step-Down (Buck)r

Specifications of MAX15017BATX+

• Internal Switch(s): Yes
• Synchronous Rectifier: Yes
• Number Of Outputs: 2
• Voltage - Output: 1.26 ~ 32 V
• Current - Output: 1A
• Frequency - Switching: 135kHz ~ 500kHz
• Voltage - Input: 7.5 ~ 40 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 36-TQFN Exposed Pad
• Power - Output: 2.1W
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

1A, 4.5V to 40V Input Buck Converters with
50mA Auxiliary LDO Regulators
12
14, 16, 19, 24,
26, 27, 30, 35
1, 2, 3, 9, 12,
MAX15014/
MAX15017
23, 28
17, 18
20, 21
______________________________________________________________________________________
10
11
13
15
22
4
5
6
7
8
PIN
14, 16, 19, 24,
26, 27, 30, 35
1, 2, 3, 9, 12,
MAX15015/
MAX15016
17, 18
20, 21
—
10
11
13
15
22
4
5
6
7
8
LDO_OUT
SET_LDO
EN_SYS
IN_LDO
EN_SW
RESET
DRAIN
NAME
SGND
PGND
N.C.
BST
I.C.
CT
LX
No Connection. Not internally connected. Leave unconnected or connect to SGND.
Internally Connected. Leave unconnected.
Active-Low Reset Output. When the rising V
threshold, RESET goes high after an adjustable delay. Pull up RESET to LDO_OUT
with at least 4kΩ. RESET is an active-low open-drain output.
Signal Ground Connection. Connect SGND and PGND together at one point near
the input bypass capacitor negative terminal.
Reset Timeout Delay Capacitor Connection. CT is pulled low during reset. When out
of reset, CT is pulled up to an internal 3.6V rail with a 2µA current source. When the
rising CT voltage reaches the trip threshold (typically 1.24V), RESET is deasserted.
When EN_SYS is low or in thermal shutdown, CT is low.
Switching Regulator Enable Input (Active High). If EN_SW is high and EN_SYS is
high, the switching power supply is enabled. EN_SW is internally pulled down to
SGND through a 0.5µA current sink.
Active-High System Enable Input. Connect EN_SYS high to turn on the system. The
LDO is active if EN_SYS is high; once EN_SYS is high, the switching regulator can
be turned on if EN_SW is high. EN_SYS is internally pulled down to SGND through a
0.5µA current sink.
LDO Feedback Input/Output Voltage Setting. Connect SET_LDO to SGND to select
the preset output voltage (5V or 3.3V). Connect SET_LDO to an external resistor-
divider network for adjustable output operation.
Linear Regulator Output. Bypass with at least 10µF low-ESR capacitor from
LDO_OUT to SGND. In the 5V LDO versions (A), the LDO operates in dropout below
6V down to the UVLO trip point.
LDO Input Voltage. The input voltage range for the LDO extends from 5V to 40V.
Bypass with a 0.1µF ceramic capacitor to SGND.
High-Side Gate Driver Supply. Connect BST to the cathode of the bootstrap diode
and to the positive terminal of the bootstrap capacitor.
Source Connection of Internal High-Side Switch. Connect both LX pins to the
inductor and the cathode of the freewheeling diode.
Drain Connection of the Internal High-Side Switch. Connect both DRAIN inputs
together.
Power Ground Connection. Connect the input bypass capacitor negative terminal,
the anode of the freewheeling diode, and the output filter capacitor negative terminal
to PGND. Connect PGND to SGND together at a single point near the input bypass
capacitor negative terminal.
FUNCTION
LDO_OUT
voltage crosses the reset
Pin Description