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MAX16936 データシートの表示(PDF) - Maxim Integrated

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MAX16936 Datasheet PDF : 17 Pages
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MAX16936
36V, 220kHz to 2.2MHz Step-Down Converter
with 28µA Quiescent Current
Pin Descriptions (continued)
PIN
TSSOP
TQFN
10
9
11
10
12
13, 14
15
16
11
12, 13
14
15
NAME
EN
SUP
SUPSW
LX
PGND
PGOOD
EP
FUNCTION
SUP Voltage Compatible Enable Input. Drive EN low to disable the device. Drive EN high
to enable the device.
Voltage Supply Input. SUP powers up the internal linear regulator. Bypass SUP to PGND
with a 4.7FF ceramic capacitor.
Internal High-Side Switch Supply Input. SUPSW provides power to the internal switch.
Bypass SUPSW to PGND with 0.1FF and 4.7FF ceramic capacitors.
Inductor Switching Node. Connect a Schottky diode between LX and AGND.
Power Ground
Open-Drain, Active-Low Reset Output. PGOOD asserts when VOUT is above 95%
regulation point. PGOOD goes low when VOUT is below 92% regulation point.
Exposed Pad. Connect EP to a large-area contiguous copper ground plane for effective
power dissipation. Do not use as the only IC ground connection. EP must be connected
to PGND.
Detailed Description
The MAX16936 is a 2.5A current-mode step-down
converter with integrated high-side and low-side MOSFETs
designed to operate with an external Schottky diode for
better efficiency. The low-side MOSFET enables fixed-
frequency forced-PWM (FPWM) operation under light-load
applications. The device operates with input voltages from
3.5V to 36V, while using only 28FA quiescent current at no
load. The switching frequency is resistor programmable
from 220kHz to 2.2MHz and can be synchronized to an
external clock. The output voltage is available as 5V/3.3V
fixed or adjustable from 1V to 10V. The wide input voltage
range along with its ability to operate at 98% duty cycle
during undervoltage transients make the device ideal for
automotive and industrial applications.
Under light-load applications, the FSYNC logic input
allows the device to either operate in skip mode for
reduced current consumption or fixed-frequency FPWM
mode to eliminate frequency variation to minimize EMI.
Fixed frequency FPWM mode is extremely useful for
power supplies designed for RF transceivers where tight
emission control is necessary. Protection features include
cycle-by-cycle current limit, overvoltage protection, and
thermal shutdown with automatic recovery. Additional fea-
tures include a power-good monitor to ease power-supply
sequencing and a 180N out-of-phase clock output relative to the
internal oscillator at SYNCOUT to create cascaded power
supplies with multiple devices.
Wide Input Voltage Range
The device includes two separate supply inputs (SUP and
SUPSW) specified for a wide 3.5V to 36V input voltage
range. VSUP provides power to the device and VSUPSW
provides power to the internal switch. When the device
is operating with a 3.5V input supply, conditions such as
cold crank can cause the voltage at SUP and SUPSW to
drop below the programmed output voltage. Under such
conditions, the device operates in a high duty-cycle mode
to facilitate minimum dropout from input to output.
Linear Regulator Output (BIAS)
The device includes a 5V linear regulator (BIAS) that pro-
vides power to the internal circuit blocks. Connect a 1FF
ceramic capacitor from BIAS to AGND.
Power-Good Output (PGOOD)
The device features an open-drain power-good output,
PGOOD. PGOOD asserts when VOUT rises above 95%
of its regulation voltage. PGOOD deasserts when VOUT
drops below 92% of its regulation voltage. Connect
PGOOD to BIAS with a 10kI resistor.
Maxim Integrated
  9

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