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PDF MAX17232 Data sheet ( Hoja de datos )
| Número de pieza | MAX17232 | |
| Descripción | Synchronous Dual Buck Controller | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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MAX17232/MAX17233
EVALUATION KIT AVAILABLE
3.5V–36V, 2.2MHz, Synchronous Dual Buck
Controller with 20µA Quiescent Current
General Description
The MAX17232/MAX17233 offers dual synchronous step-
down DC-DC controllers with integrated MOSFETs. They
operates over a 3.5V to 36V input voltage range with 42V
input transient protection, and can operate in dropout
condition by running at 95% duty cycle. The controllers
can generate fixed output voltages of 3.3V/5V, along with
the capability to program the output voltage between
1V to 10V.
These devices use a current-mode-control architecture.
The devices can be operated in pulse-width modulation
(PWM) or pulse-frequency modulation (PFM) control
schemes. PWM operation provides constant frequency
operation at all loads, and is useful in applications
sensitive to switching frequency. PFM operation disables
negative inductor current and additionally skips pulses at
light loads for high efficiency. The low-resistance, on-chip
MOSFETs ensure high efficiency at full load and simplify
the layout.
The devices are available in a 28-pin TQFN-EP package
with exposed pad, and are specified for operation over
-40°C to +85°C.
Applications
●● Distributed Supply Regulation
●● Wall Transformer Regulation
●● General-Purpose Point-of-Load
Benefits and Features
●● Eliminates External Components and Reduces Total Cost
• No Schottky-Synchronous Operation for High
Efficiency and Reduced Cost
• Simple External RC Compensation for Stable
Operation at Any Output Voltage
• All-Ceramic Capacitor Solution: Ultra-Compact Layout
• 180° Out-of-Phase Operation Reduces Output
Ripple and Enables Cascaded Power Supplies
●● Reduces Number of DC-DC Controllers to Stock
• Fixed Output Voltage with ±1% Accuracy (5V/3.3V)
or Externally Resistor Adjustable (1V to 10V)
• 220kHz to 2.2MHz Adjustable Frequency with
External Synchronization
• Frequency Synchronization Input
●● Reduces Power Dissipation
• 92% Peak Efficiency
• 8μA (typ) in Shutdown
• 20μA (typ) Quiescent Current in PFM Mode
●● Operates Reliably
• 42V Input Voltage Transient Protection
• Cycle-by-Cycle Current Limit, Thermal Shutdown
• Supply Overvoltage and Undervoltage Lockout
• Power-OK Monitor
• Reduced EMI Emission with Spread-Spectrum Control
• 50ns (typ) Minimum On-Time Guarantees PWM
Operation at Low Duty Cycle at 2.2MHz
Ordering Information and Selector Guide appears at end of
data sheet.
19-8366; Rev 0; 2/16
1 page  
MAX17232/MAX17233
3.5V–36V, 2.2MHz, Synchronous Dual Buck
Controller with 20µA Quiescent Current
Electrical Characteristics (continued)
(VIN = 14V, VBIAS = 5V, CBIAS = 6.8µF, TA = TJ = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C under
normal conditions, unless otherwise noted.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNIT
PGOOD1, PGOOD2 Threshold
PGOOD1, PGOOD2 Leakage
Current
PGOOD_H
PGOOD_F
% of VOUT_, rising
% of VOUT_, falling
VPGOOD1,2 = 5V, TA = +25°C
85 90 95
80 85 90
0.01
1
%
µA
PGOOD1, PGOOD2 Startup
Delay Time
Buck 1 and buck 2 after soft-start is
complete
64 Cycles
PGOOD1, PGOOD2 Debounce
Time
Fault detection
8 20 50 µs
INTERNAL LDO: BIAS
Internal BIAS Voltage
BIAS UVLO Threshold
Hysteresis
VIN > 6V
VBIAS rising
VBIAS falling
4.75 5 5.25
3.1 3.4
2.7 2.9
0.2
V
V
V
External VCC
THERMAL OVERLOAD
VTH,EXTVCC EXTVCC rising, HYST = 110mV
3.0 3.2
V
Thermal-Shutdown Temperature
(Note 4)
+170
°C
Thermal-Shutdown Hysteresis
(Note 4)
20 °C
EN LOGIC INPUT
High Threshold
1.8 V
Low Threshold
0.8 V
Input Current
TA = +25°C
1 µA
Note 2: Limits are 100% production tested at TA = +25°C. Limits over the operating temperature range and relevant supply voltage
range are guaranteed by design and characterization. Typical values are at TA = +25°C.
Note 3: Overvoltage protection is detected at the FB1/FB2 pins. If the feedback voltage reaches overvoltage threshold of FB1/FB2 +
15% (typ), the corresponding controller stops switching. The controllers resume switching once the output drops below FB1/FB2
+ 10% (typ).
Note 4: Guaranteed by design; not production tested.
www.maximintegrated.com
Maxim Integrated │ 5
5 Page 
MAX17232/MAX17233
3.5V–36V, 2.2MHz, Synchronous Dual Buck
Controller with 20µA Quiescent Current
Pin Description (continued)
PIN NAME
DESCRIPTION
Open-Drain Power-Good Output for Buck 1. PGOOD1 is low if OUT1 is more than 15% (typ) below
the normal regulation point. PGOOD1 asserts low during soft-start and in shutdown. PGOOD1
12 PGOOD1 becomes high impedance when OUT1 is in regulation. To obtain a logic signal, pullup PGOOD1
with an external resistor connected to a positive voltage lower than 5.5V. Place a minimum of 100Ω
(RPGOOD1) in series with PGOOD1. See the Voltage Monitoring section for details.
Open-Drain Power-Good Output for Buck 2. PGOOD2 is low if OUT2 is more than 15% (typ) below
13
PGOOD2
the normal regulation point. PGOOD2 asserts low during soft-start and in shutdown. PGOOD2
becomes high impedance when OUT2 is in regulation. To obtain a logic signal, pullup PGOOD2 with
an external resistor connected to a positive voltage lower than 5.5V.
External Clock Synchronization Input. Synchronization to the controller operating frequency ratio is
14
FSYNC
1. Keep fSYNC a minimum of 10% greater than the maximum internal switching frequency for stable
operation. See the Switching Frequency/External Synchronization section.
15
FOSC
Frequency Setting Input. Connect a resistor from FOSC to AGND to set the switching frequency of
the DC-DC converters.
16
COMP2
Buck 2 Error Amplifier Output. Connect an RC network to COMP2 to compensate buck 2.
Feedback Input for Buck 2. Connect FB2 to BIAS for the 3.3V fixed output or to a resistive divider
17 FB2 between OUT2 and GND to adjust the output voltage between 1V and 10V. In adjustable mode, FB2
regulates to 1V (typ). See the Setting the Output Voltage in Buck Converters section.
Output Sense and Negative Current-Sense Input for Buck 2. When using the internal preset 3.3V
18
OUT2
feedback-divider (FB2 = BIAS), the buck uses OUT2 to sense the output voltage. Connect OUT2 to
the negative terminal of the current-sense resistor. See the Current Limiting and Current-Sense Inputs
and Current-Sense Measurement sections.
19
CS2
Positive Current-Sense Input for Buck 2. Connect CS2 to the positive terminal of the current-sense
resistor. See the Current Limiting and Current-Sense Inputs and Current-Sense Measurement sections.
20
PGND2
Power Ground for Buck 2
21 DL2 Low-Side Gate Drive Output for Buck 2. DL2 output voltage swings from VPGND2 to VBIAS.
22
LX2
Inductor Connection for Buck 2. Connect LX2 to the switched side of the inductor. LX2 serves as the
lower supply rail for the DH2 high-side gate drive.
23
DH2
High-Side Gate Drive Output for Buck 2. DH2 output voltage swings from VLX2 to VBST2.
Boost Capacitor Connection for High-Side Gate Voltage of Buck 2. Connect a high-voltage diode
24
BST2
between BIAS and BST2. Connect a ceramic capacitor between BST2 and LX2. See the High-Side
Gate-Driver Supply (BST_) section.
25
EN2
High-Voltage Tolerant, Active-High Digital Enable Input for Buck 2. Driving EN2 high enables buck 2.
26
EN1
High-Voltage Tolerant, Active-High Digital Enable Input for Buck 1. Driving EN1 high enables buck 1.
Boost Capacitor Connection for High-Side Gate Voltage of Buck 1. Connect a high-voltage diode
27
BST1
between BIAS and BST1. Connect a ceramic capacitor between BST1 and LX1. See the High-Side
Gate-Driver Supply (BST_) section.
28
DH1
High-Side Gate-Drive Output for Buck 1. DH1 output voltage swings from VLX1 to VBST1.
Exposed Pad. Connect the exposed pad to ground. Connecting the exposed pad to ground does not
—
EP
remove the requirement for proper ground connections to PGND1, PGND2, and AGND. The exposed
pad is attached with epoxy to the substrate of the die, making it an excellent path to remove heat from
the IC.
www.maximintegrated.com
Maxim Integrated │ 11
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet MAX17232.PDF ] | |
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