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参数资料
| 型号： | MAX8792ETD+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 10/28页 |
| 文件大小： | 0K |
| 描述： | IC PWM CTRLR STEP-DWN 14TDFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1 |
| 应用： | PWM 控制器 |
| 输入电压： | 2 V ~ 26 V |
| 电源电压： | 4.5 V ~ 5.5 V |
| 电流 - 电源： | 700µA |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 14-WFDFN 裸露焊盘 |
| 供应商设备封装： | 14-TDFN-EP（3x3） |
| 包装： | 标准包装 |
| 其它名称： | MAX8792ETD+TDKR |
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Single Quick-PWM Step-Down
Controller with Dynamic REFIN
Pin Description
T SW TON TON + 6 . 5 k Ω ) ?
( R
? V FB ?
? V OUT ? ?
PIN
1
2
3
4
5
6
7
8
9
10
11
12
13
NAME
EN
V DD
DL
LX
DH
BST
TON
FB
ILIM
REFIN
REF
SKIP
V CC
FUNCTION
Shutdown Control Input. Connect to V DD for normal operation. Pull EN low to place the controller into
its 2μA shutdown state. When disabled, the MAX8792 slowly ramps down the target/output voltage to
ground and after the target voltage reaches 0.1V, the controller forces both DH and DL low and
enters the low-power shutdown state. Toggle EN to clear the fault-protection latch.
Supply Voltage Input for the DL Gate Driver. Connect to the system supply voltage (+4.5V to +5.5V).
Bypass V DD to power ground with a 1μF or greater ceramic capacitor.
Low-Side Gate Driver. DL swings from GND to V DD . The controller pulls DL high when an output
overvoltage fault is detected, overriding any negative current-limit condition that may be present. The
MAX8792 forces DL low during V CC UVLO and REFOK lockout conditions.
Inductor Connection. Connect LX to the switched side of the inductor as shown in Figure 1.
High-Side Gate Driver. DH swings from LX to BST. The MAX8792 pulls DH low whenever the
controller is disabled.
Boost Flying-Capacitor Connection. Connect to an external 0.1μF 6V capacitor as shown in Figure 1.
The MAX8792 contains an internal boost switch/diode (see Figure 2).
Switching Frequency-Setting Input. An external resistor between the input power source and TON
sets the switching period (T SW = 1/f SW ) according to the following equation:
= C
where C TON = 16.26pF and V FB = V REFIN under normal operating conditions. If the TON current
drops below 10μA, the MAX8792 shuts down, and enters a high-impedance state.
TON is high impedance in shutdown.
Feedback Voltage-Sense Connection. Connect directly to the positive terminal of the output capacitors
for output voltages less than 2V as shown in Figure 1. For fixed-output voltages greater than 2V,
connect REFIN to REF and use a resistive divider to set the output voltage (Figure 4). FB senses the
output voltage to determine the on-time for the high-side switching MOSFET.
Current-Limit Threshold Adjustment. The current-limit threshold is 0.05 times (1/20) the voltage at
ILIM. Connect ILIM to a resistive divider (from REF) to set the current-limit threshold between 20mV
and 100mV (with 0.4V to 2V at ILIM).
External Reference Input. REFIN sets the feedback regulation voltage (V FB = V REFIN ) of the MAX8792
using the resistor-divider connected between REF and GND. The MAX8792 includes an internal
window comparator to detect REFIN voltage transitions, allowing the controller to blank PGOOD and
the fault protection.
2V Reference Voltage. Bypass to analog ground using a 470pF to 10nF ceramic capacitor. The
reference can source up to 50μA for external loads.
Pulse-Skipping Control Input. This four-level input determines the mode of operation under normal
steady-state conditions and dynamic output-voltage transitions:
V DD (5V) = forced-PWM operation.
REF (2V) = pulse-skipping mode with forced-PWM during transitions.
Open (3.3V)= ultrasonic mode (without forced-PWM during transitions).
GND = pulse-skipping mode (without forced-PWM during transitions).
5V Analog Supply Voltage. Internally connected to V DD through an internal 20 Ω resistor. Bypass V CC
to analog ground using a 1μF ceramic capacitor.
10
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