Buck Converter. MAX77596 Datasheet

MAX77596 Converter. Datasheet pdf. Equivalent


Maxim Integrated MAX77596
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


MAX77596 Datasheet
Recommendation MAX77596 Datasheet
Part MAX77596
Description Buck Converter
Feature MAX77596; MAX77596 EVALUATION KIT AVAILABLE 24V, 300mA, Buck Converter with 1.1µA IQ General Description The.
Manufacture Maxim Integrated
Datasheet
Download MAX77596 Datasheet




Maxim Integrated MAX77596
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
%
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Maxim Integrated 2



Maxim Integrated MAX77596
MAX77596
24V, 300mA, Buck Converter with 1.1µA IQ
Electrical Characteristics (continued)
(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
FB Line Regulation
High-Side DMOS RDSON
Low-Side DMOS RDSON
DMOS High-Side Current-Limit
Threshold
DMOS High-Side Skip-Mode
Peak-Current Threshold
DMOS Low-Side Zero-Crossing
Threshold
DMOS Low-Side Negative
Current-Limit Threshold
Soft-Start Ramp Time
LX Rise Time
Minimum On-Time
Maximum Duty Cycle
PWM Switching Frequency
RESET OUTPUT (RESET)
RESET Threshold
RESET Debounce
RESET High Leakage Current
RESET Low Level
LOGIC LEVELS
EN Input High Threshold
EN Input Low Threshold
EN Input Current
MODE Input High Threshold
MODE Input Low Threshold
MODE Internal Pulldown
THERMAL PROTECTION
Thermal Shutdown
Thermal-Shutdown Hysteresis
SYMBOL
ΔVLINE
RON,HS
RON,LS
IMAX
CONDITIONS
6V ≤ VSUP ≤ 24V
VBIAS = 5V, ILX = 200mA
VBIAS = 5V, ILX = 200mA
ISKIP
IZX
INEG
tSS
tRISE,LX
tON_MIN
DCMAX
fSW
FPWM mode
(Note 3)
VTHR_RES
VTHF_RES
tDEB
ILEAK,RES
VOUT,RES
VOUT rising
VOUT falling
TA = +25°C
Sinking 1mA
VIH,EN
VIL,EN
IIN,EN
VIH,MODE
VIL,MODE
RPD,MODE
TSHDN (Note 3)
TSHDN,HYS (Note 3)
MIN TYP MAX UNITS
0.02
%/V
1000 2200
500 1200
425 500 575
mA
70 100 130 mA
40 mA
1.58
-320
6.67
6
34
98
1.7
1.82
mA
ms
ns
ns
%
MHz
90 92 94
88 90 92 %VOUT
12 µs
1 µA
0.4 V
2.4
0.4
0.1
1.4
0.4
1000
V
V
µA
V
V
+175
+15
°C
°C
Note 2: Limits are 100% tested at TA = +25°C. Limits over the operating temperature range and relevant
supply voltage range are guaranteed by design and characterization.
Note 3: Guaranteed by design; not production tested.
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Maxim Integrated 3





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