MAX1945R 데이터 시트보기 (PDF) - Maxim Integrated
부품명
상세내역
제조사
MAX1945R Datasheet PDF : 19 Pages
| |||
1MHz, 1% Accurate, 6A Internal Switch
Step-Down Regulators
Typical Operating Characteristics (continued)
(VIN = VCC = 5V, VOUT = 1.8V, IOUT = 6A, fSW = 500kHz, VDD = VCC, and TA = +25°C, unless otherwise noted.)
VOLTAGE MARGINING (9%)
MAX1945 toc18
SHORT-CIRCUIT INDUCTOR CURRENT
MAX1945 toc19
SHORT-CIRCUIT INDUCTOR CURRENT
(EXPANDED TIME)
MAX1945 toc20
VCTL1
2V/div
VOUT
200mV/div
VOUT
500mV/div
ILX
5A/div
VOUT
500mV/div
ILX
10A/div
VLX
2V/div
400µs/div
100ms/div
10µs/div
Pin Description
PIN
NAME
FUNCTION
1
BST
Bootstrap Voltage. High-side driver supply input. Connect a 0.1µF capacitor from BST to LX. Connect a
Schottky diode from IN to BST. A 1N4148 diode can be used for 5V input to reduce cost.
2
VDD
Low-Side Driver Supply Voltage
3, 5, 7, 9,
20, 22, 24,
26
LX
Inductor Connection. Connect an inductor between LX and the regulator output. Connect all LX pins
together close to the device.
4, 6, 8, 10
IN
Power-Supply Voltage. Input voltage ranges from 2.6V to 5.5V. Bypass with 3 x 22µF ceramic capacitors
in parallel to PGND (see the Input Capacitor Selection section).
11
VCC
Supply-Voltage Input. VCC powers the device. Connect a 10Ω resistor from IN to VCC. Bypass VCC to
GND with 0.1µF.
12
GND Analog Ground
13
REF
Reference. Bypass REF with 0.22µF capacitor to GND. REF tracks the soft-start ramp voltage margining
and is pulled to GND when the output shuts down.
14
COMP
Regulator Compensation. Connect a series RC network from COMP to GND. COMP is pulled to GND
when the output shuts down (see the Compensation Design section).
Feedback Input. When FBSEL = High-Z, use an external resistor divider from the output to set the voltage
15
FB
from 0.8V to 85% of VIN. Connect FB to the output for regulation to 1.8V when FBSEL = 0, or for
regulation to 2.5V when FBSEL = VCC.
Feedback Select Input. The device regulates to an output of 0.8V when FBSEL is left unconnected. The
16
FBSEL device regulates to an output of 1.8V when FBSEL = GND and regulates to an output of 2.5V when
FBSEL = VCC.
17
SYNC Synchronization/Frequency Select. Connect SYNC to GND for 500kHz operation, to VCC for 1MHz
operation, or connect to an external clock at 400kHz to 1.2MHz.
18
SYNCOUT
Synchronization Output. SYNCOUT provides a frequency output synchronized 180 degrees out-of-phase
to the operating frequency of the device.
10 ______________________________________________________________________________________
Share Link: 