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PDF MAX16931 Data sheet ( Hoja de datos )
| Número de pieza | MAX16931 | |
| Descripción | (MAX16930 / MAX16931) Dual Buck | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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EVALUATION KIT AVAILABLE
MAX16930/MAX16931
2MHz, 36V, Dual Buck with Preboost and
20µA Quiescent Current
General Description
The MAX16930/MAX16931 offer two high-voltage,
synchronous step-down controllers and a step-up
preboost controller. They operate with an input voltage
supply from 2V to 42V with preboost active and can oper-
ate in drop-out condition by running at 95% duty cycle.
The devices are intended for applications with mid- to
high-power requirements that operate at a wide input
voltage range such as during automotive cold-crank or
engine stop-start conditions.
The MAX16930/MAX16931 step-down controllers oper-
ate 180N out-of-phase at frequencies up to 2.2MHz to
allow small external components, reduced output ripple,
and to guarantee no AM band interference. The switch-
ing frequency is resistor adjustable. The FSYNC input
programmability enables three frequency modes for
optimized performance: forced fixed-frequency opera-
tion, skip mode with ultra-low quiescent current (20FA),
and synchronization to an external clock. The devices
also provide a spread-spectrum option to minimize EMI
interference.
The MAX16930/MAX16931 are offered with an asynchro-
nous step-up controller. This preboost circuitry turns on
during low input voltage conditions. It is designed to pro-
vide power to step-down controller channels with input
voltages as low as 2V.
The devices also feature a power-OK monitor and
overvoltage and undervoltage lockout. Protection
features include cycle-by-cycle current limit and thermal
shutdown.
The devices are available in a 40-pin TQFN-EP package
and are specified for operation over the -40NC to +125NC
automotive temperature range.
Features
S Dual, 2MHz Step-Down Controllers
S Preboost for Operation to 2V
S 180° Out-of-Phase Operation
S 50ns Minimum On-Time Allows 3.3V Output from
Car Battery at 2.2MHz
S 20µA Operating Current
S Wide Input Supply Range from 3.5V to 36V (with-
out Preboost)
S Resistor Programmable Frequency Between
200kHz and 2.2MHz
S Q1% Output-Voltage Accuracy: 5.0V/3.3V Fixed or
Adjustable Between 1V and 10V
S Current-Mode Controllers with Forced Continuous
and Skip Modes
S Frequency Synchronization Input
S Supply Overvoltage and Undervoltage Lockout
S Overtemperature and Short-Circuit Protection
S Thermally Enhanced 40-Pin TQFN-EP Package
S -40NC to +125NC Operating Temperature
Applications
POL Applications for Automotive Power
Distributed DC Power Systems
Navigation and Radio Head Units
Ordering Information and Selector Guide appear at end of
data sheet.
For related parts and recommended products to use with this part, refer to: www.maximintegrated.com/MAX16930.related
For pricing, delivery, and ordering information, please contact Maxim Direct at
1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.
19-6631; Rev 1; 7/13
Free Datasheet http://www.datasheet4u.com/
1 page  
MAX16930/MAX16931
2MHz, 36V, Dual Buck with Preboost and
20µA Quiescent Current
ELECTRICAL CHARACTERISTICS (continued)
(VIN = 14V, VBIAS = 5V, CBIAS = 6.8μF, TA = TJ = -40NC to +125NC, unless otherwise noted.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
Battery rising and EN3 high
MIN
0.325
TYP
0.35
MAX
0.375
UNIT
INS Threshold
Undervoltage Lockout
VINS,UV
Battery falling and EN3 high, preboost
turns off when VINS falls below this
threshold
0.275 0.3 0.325
V
BSTON Leakage Current
BSTON Debounce Time
DL3 Pullup Resistance
DL3 Pulldown resistance
Feedback Voltage
Boost Load Regulation Error
VFB3
VBSTON = 5V, TA = +25NC
Fault detection
VBIAS = 5V, IDL3 = -100mA
VBIAS = 5V, IDL3 = +100mA
No load on boost output
0mV < VCS3P - VCS3N < 120mV,
error proportional to input current
1.1875
0.01
10
4
1
1.25
0.7
1
8
2
1.3125
FA
Fs
I
I
V
%/A
EN3 Threshold
High threshold
Low threshold
3.5
V
2
EN3 Input Current
TERM Resistance
TERM Leakage Current
INS and FB3 Leakage Current
VEN3 = 5.5V
ITERM = 10mA
VTERM = 14V, VEN3 = 0V, TA = +25NC
TA = +25NC
7
70
0.01
0.01
14
150
1
1
FA
I
FA
FA
Note 2: Limits are 100% production tested at TA = +25°C. Limits over the operating temperature range and relevant supply volt-
age 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 controllers stop switching. The controllers resume switching once the output drops below
FB1/FB2 + 10% (typ).
Note 4: Guaranteed by design; not production tested.
Maxim Integrated
5
5 Page 
PIN
10
11
12
13
14
15
16
17
18
19
20
21, 38
22
23
24
25
MAX16930/MAX16931
2MHz, 36V, Dual Buck with Preboost and
20µA Quiescent Current
Pin Description (continued)
NAME
EXTVCC
IN
PGOOD1
FB3
INS
CS3P
CS3N
TERM
DL3
PGND3
PGOOD2
N.C.
FSYNC
FOSC
COMP2
FB2
DESCRIPTION
3.1V to 5.2V Input to the Switchover Comparator
Supply Input. Connect IN to the output of the preboost. Bypass IN with sufficient capacitance to
supply the two out-of-phase buck converters.
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
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.
Preboost Feedback Input. Connect FB3 to the center tap of a resistive-divider between the boost
regulator output and TERM to adjust the output voltage. FB3 regulates to 1.25V (typ). See the Setting
the Output Voltage in Boost Converter section.
Input Voltage Sense for Preboost. The voltage at INS is compared to internal comparator reference.
Program the preboost threshold by using resistor-divider from BAT to INS to TERM pin.
Positive Current-Sense Input for Preboost. Connect CS3P to the positive terminal of the current-
sense resistor. See the Current Limit in Boost Controller and Shunt Resistor Selection in Boost
Converter sections.
Negative Current-Sense Input for Preboost. Connect CS3N to the negative terminal of the current-
sense resistor. See the Current Limit in Boost Controller and Shunt Resistor Selection in Boost
Converter sections.
Ground Switch. TERM opens when the voltage at EN3 is logic-low. Use TERM to terminate the
preboost feedback and INS resistive divider.
Preboost n-Channel MOSFET Gate-Drive Output
Power Ground for Preboost. All the high-current paths for the preboost should terminate to this
ground.
Open-Drain Power-Good Output for Buck 2. PGOOD2 is low if OUT2 is more than 90% (typ) below
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.
No Connection
External Clock Synchronization Input. Synchronization to the controller operating frequency ratio is
1. Keep fSYNC a minimum of 10% greater than the maximum internal switching frequency for stable
operation. See the Switching Frequency/External Synchronization section.
Frequency Setting Input. Connect a resistor from FOSC to AGND to set the switching frequency of
the DC-DC converters.
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
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.
Maxim Integrated
11
11 Page | ||
| Páginas | Total 29 Páginas | |
| PDF Descargar | [ Datasheet MAX16931.PDF ] | |
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