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PDF MAX17559 Data sheet ( Hoja de datos )
| Número de pieza | MAX17559 | |
| Descripción | Synchronous Step-Down Controller | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MAX17559 (archivo pdf) en la parte inferior de esta página. Total 28 Páginas | ||
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MAX17559
EVALUATION KIT AVAILABLE
60V, Dual-Output, Synchronous
Step-Down Controller
General Description
The MAX17559 is a dual-output, synchronous step-down
controller that drives nMOSFETs. The device uses a
constant-frequency, peak-current-mode architecture.
The two outputs can be configured as independent
voltage rails. Input capacitor size is minimized by running
the two outputs 180° out-of-phase.
The IC supports current sensing using either an external
current-sense resistor for accuracy or an inductor DCR for
improved system efficiency. Current foldback or latchoff limits
MOSFET power dissipation under short-circuit conditions.
The IC provides independent adjustable soft-start/stop
for each output and can start up monotonically into a
prebiased output. The IC can be configured in either
PWM or DCM modes of operation, depending on whether
constant-frequency operation or light-load efficiency is
desired.
The IC operates over the -40°C to +125°C temperature
range and is available in a lead(Pb)-free, 7mm x 7mm,
32-pin TQFP, package.
Applications
●● Industrial Power Supplies
●● Distributed DC Power Systems
●● Motion Control
●● Programmable Logic Controllers
●● Computerized Numerical Control
Benefits and Features
●● Wide Range of Operation
• Wide 4.5V to 60V Input Voltage Range
• Wide 0.8V to 24V Output Voltage Range
• RSENSE or Inductor DCR Current-Sensing
• Fixed 180° Out-of-Phase Operation
• Adjustable 100kHz to 2.2MHz Switching Frequency
• Independent Enable and PGOOD
• Available in a Lead(Pb)-Free 7mm x 7mm, 32-Pin
TQFP Package
●● Enhances Power Efficiency
• Low-Impedance Gate Drives for High Efficiency
• DCM Operation at Light Loads
• Auxiliary Bootstrap LDO
●● Operates Reliably in Adverse Industrial Environments
• Independent Adjustable Soft-Start/Stop or Tracking
• Current Selectable Foldback or Latchoff Limits
MOSFET Heat Dissipation During a Short-Circuit
Condition
• Operates Over the -40°C to +125°C Temperature
Range
• Output Overvoltage and Overtemperature Protections
Ordering Information appears at end of data sheet.
19-7660; Rev 0; 6/15
1 page  
MAX17559
60V, Dual-Output, Synchronous
Step-Down Controller
Electrical Characteristics (continued)
(VIN = 24V, RT = open, CVCCINT = 4.7µF, EN_ = open, DH_, DL_ = open, TJ = -40°C to +125°C, unless otherwise noted. Typical values
are at TA = +25°C.) (Note 2)
PARAMETER
GATE DRIVER
DH_ to BST_ On-Resistance
DH_ to LX_ On-Resistance
DL_ to VCCINT On-Resistance
DL_ to PGND_ On-Resistance
DH_ Minimum Controlled
On-Time
DL_ Minimum Controlled
Off-Time
Dead Time
DH_ Transition Time
DL_ Transition Time
SOFT-START/STOP
Soft-Start/Stop Current
ENABLE
EN_ Logic-High Threshold
EN_ Hysteresis
EN_Bias Pullup Bias Current
CURRENT-SENSE AMPLIFIER
CS_+ , CS_- Common-Mode
Voltage Range
CS_+ to CS_- Input Operating
Voltage Range
Current-Sense Amplifier Gain
CS+_ Input Bias Current
CS-_ Input Bias Current
SYMBOL
CONDITIONS
Sourcing 100mA
Sinking 100mA
Sourcing 100mA
Sinking 100mA
tON_MIN
tOFF_MIN PWM mode, VFB_ = 0.84V
tDT
DH_ falling to DL_ rising, CLOAD = 6nF
DL_ falling to DH_ rising, CLOAD = 6nF
DH_ rising, CLOAD = 6nF
DH_ falling, CLOAD = 6nF
DL_ rising, CLOAD = 6nF
DL_ falling, CLOAD = 6nF
ISS VSS = 0.5V
EN_ rising
VEN = 0.5V
VCS+ -
VCS-
GCS
0 < VCS- < 24V
0 < VCS- < 24V, TA = TJ = 25°C
VCS+ = VCS- = 1.2V or 24V
MIN TYP MAX UNITS
0.7 1.3 2.5
0.25 0.5
0.9
0.7 1.3 2.5
0.35 0.75 1.25
120 155
80 120 160
30
30
25
15
25
15
Ω
Ω
Ω
Ω
ns
ns
ns
ns
ns
3.5 5 6.5 µA
1.2 1.25 1.3
90
0.9 1.8 2.7
V
mV
µA
0 24
-100
+100
12 13.3 14.5
0.01 1
5 600
V
mV
V/V
µA
µA
www.maximintegrated.com
Maxim Integrated │ 5
5 Page 
MAX17559
Pin Configuration
60V, Dual-Output, Synchronous
Step-Down Controller
40 38
31
11
32 31 3307 2396 3285 3247 3236 3252
30
CS1- 21
24 2B9ST1
RT 23
23 2D8L1
ILIM2 34
22 2I7N
ILIMSEL 54
SKIP 56
GND 67
MAX17559
21 2P6GND
20 2V5CCEXT
19 2V4CCINT
EN1 78
18 2D3L2
EN2 98
17 2B2ST2
1100 1111 9 10 11 12 13 14 15 16 20 21
TQFP
(7mm x 7mm)
Pin Description
PIN NAME
1, 9 CS1-, CS2-
2 RT
3, 28
4
ILIM2, ILIM1
ILIMSEL
5 SKIP
6 GND
7, 8 EN1, EN2
FUNCTION
Current-Sense Amplifier Negative Input of Controller 1 and Controller 2, Respectively. Connect to
negative terminal of current-sense signal. See Figure 5 and Figure 6.
Switching Frequency Programming Resistor Connection. Connect a resistor between RT and GND
to set the switching frequency. See Figure 3. Connect to VCCINT to program switching frequency of
535kHz. Connect to GND to program switching frequency of 350kHz.
Current-limit Selection Inputs for Controller 2 and Controller 1. See the Peak Current-Limit
Programming (ILIM) section for a more detailed description.
Current-Limit Operating Mode Selection Input. Connect to GND or unconnected to select latchoff or
foldback mode during overload/short circuit condition.
Connect SKIP to VCCINT to Select PWM Mode of Operation. Pull up SKIP with 100kΩ to VCCINT or
connect to a voltage between 1.25V and VCCINT - 1.5V to program DCM mode of operation. SKIP is
internally pulled down to GND by 100kΩ.
Signal Ground Connection. GND should connect to the PGND plane at a single point. Refer to the
MAX17559 evaluation kit data sheet PCB layout for an example grounding scheme.
Enable Input for Controller 1 and Controller 2. Either leave unconnected or connect to a voltage
between 1.25V and 5.5V to enable corresponding controller. Connect to GND to disable
corresponding controller.
www.maximintegrated.com
Maxim Integrated │ 11
11 Page | ||
| Páginas | Total 28 Páginas | |
| PDF Descargar | [ Datasheet MAX17559.PDF ] | |
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