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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX77596 Datasheet

Buck Converter

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MAX77596
EVALUATION KIT AVAILABLE
24V, 300mA, Buck Converter with 1.1µA IQ
General Description
The MAX77596 is a small, synchronous buck converter
with integrated switches. The device is designed to
deliver up to 300mA with input voltages from 3.5V to
24V, while using only 1.1µA quiescent current at no load
(fixed-output version). Voltage quality can be monitored
by observing the RESET signal. The device can operate
near dropout by running at 98% duty cycle, making it ideal
for battery-powered applications.
The device offers fixed 3.3V and 5V output versions, as
well as an adjustable version. The adjustable version
allows the user to program the output voltage between 1V
and 10V by using a resistor-divider. Frequency is fixed at
1.7MHz, which allows for small external components and
reduced output ripple. The device offers both forced-PWM
and skip modes of operation, with ultra-low quiescent cur-
rent of 1.1µA in skip mode.
The MAX77596 is available in a small (2mm x 2.5mm)
10-pin TDFN package and operates across the -40°C to
+85°C temperature range.
Applications
Portable Devices Powered from 2s, 3s,
or 4s Li+ Batteries
USB Type-C Devices
Point-of-Load Applications
Benefits and Features
Flexible Power for Systems That Require a Wide
Input Voltage Range
• VIN Range: 3.5V to 24V
• Up to 300mA Output Current
• Fixed 3.3V, 5V, or Programmable 1V to 10V
Output Voltage
• 98% (Max) Duty Cycle Operation with Low
Dropout
• Operates from 5V, 12V, or 20V USB Type-C Input
Power
• Operates from 2S, 3S, or 4S Li-Ion Battery
Minimizes Power Consumption and Extends Battery
Life
• 1.1µA Quiescent Current (3.3V Fixed Output
Voltage)
• 86% Peak Efficiency at 12VIN, 3.3 VOUT
Minimizes Solution Size
• 1.7MHz Operating Frequency
• Small 2.0mm x 2.5mm x 0.75mm 10-Pin TDFN
Package
Robust Solution
• Short-Circuit, Thermal Protections
• 6.67ms Internal Soft-Start Minimizes Inrush Current
• Current-Mode Control Architecture
• Up to 42V Input Voltage Tolerance
19-7733; Rev 1; 3/16


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX77596 Datasheet

Buck Converter

No Preview Available !

MAX77596
24V, 300mA, Buck Converter with 1.1µA IQ
Absolute Maximum Ratings
(Voltages Referenced to PGND)
SUP........................................................................-0.3V to +42V
EN...............................................................-0.3V to VSUP + 0.3V
BST to LX...............................................................................+6V
BST.........................................................................-0.3V to +47V
MODE, OUT/FB, RESET.......................... -0.3V to VBIAS + 0.3V
AGND....................................................................-0.3V to +0.3V
BIAS......................................................................-0.3V to +6.0V
OUT/FB Short-Circuit Duration..................................Continuous
Continuous Power Dissipation (TA = +70°C)
(derate 9.8mW/°C above +70°C).................................784mW
Operating Temperature Range............................ -40°C to +85°C
Junction Temperature.......................................................+150°C
Storage Temperature Range............................. -65°C to +150°C
Lead Temperature (soldering, 10s).................................... 300°C
Soldering Temperature (reflow)........................................+260°C
Package Thermal Characteristics (Note 1)
TDFN
Junction-to-Ambient Thermal Resistance (BJA).........102°C/W
Junction-to-Case Thermal Resistance (BJC)...................2.9°C/W
Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer
board. For detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-tutorial.
Electrical Characteristic
(VSUP = VEN = 14V, VMODE = 0V, TA = TJ = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C, unless
otherwise noted.) (Note 2)
PARAMETER
Supply Voltage
Supply Voltage
Supply Current
UV Lockout
BIAS Regulator Voltage
BIAS Current Limit
BUCK CONVERTER
Voltage Accuracy
Output Voltage Range
FB Voltage Accuracy
FB Input Current
FB Load Regulation
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
VSUP
3.5 24
VSUP
t < 500ms (Note 3)
42
Shutdown (VEN = 0V)
0.75
3.0
No load, fixed 3.3V VOUT
1.1 3.0
ISUP
No load, fixed 5.0V VOUT
No load, adjustable TA = +25°C
VOUT
TA = -40°C to +85°C
1.8 5.0
32 70
80
VMODE = VBIAS , no load, FPWM,
no switching
0.5 1 1.5
V
V
µA
mA
VUVLO
VBIAS rising
Hysteresis
3.0 3.2 3.4
0.4
V
VBIAS VSUP = 5.5V to 24V (MAX77596ETBC+)
10
5
V
mA
VOUT,3.3V
VOUT,5.0V
VOUT
VFB
IFB
ΔVLOAD
VOUT = 3.3V, 6V ≤ VSUP ≤ 24V,
ILOAD = 0 to 300mA
VOUT = 5.0V, 6V ≤ VSUP ≤ 24V,
ILOAD = 0 to 300mA
Adjustable output versions
Adjustable output versions,
3.5V ≤ VSUP ≤ 24V, ILOAD = 300µA
VFB = 1V
ILOAD = 0.3mA to 300mA
3.1 3.3 3.4
4.8
1
0.98
5.0
1.0
0.02
2
5.15
10
1.03
V
V
V
µA
%
www.maximintegrated.com
Maxim Integrated 2


Part Number MAX77596
Description Buck Converter
Maker Maxim Integrated
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