参数资料
| 型号： | A8670EESTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 2/28页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 2A 20QFN |
| 标准包装： | 1 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 可调至 0.6V |
| 输入电压： | 7 V ~ 16 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 200kHz ~ 1MHz |
| 电流 - 输出： | 2A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-WFQFN 裸露焊盘 |
| 包装： | 标准包装 |
| 供应商设备封装： | 20-QFN 裸露焊盘（4x4） |
| 其它名称： | 620-1397-6 |
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A8670
Fixed Frequency, 2 A Synchronous Buck Regulator
With Fault Warnings and Power OK
Features and Benefits
? High efficiency integrated FETs optimized for lower duty
cycle voltage conversion: 180 m Ω high side, 40 m Ω low side
? Adjustable output voltage, down to 0.6 V
? Extremely short minimum controllable on-time;
example: allows 12 V conversion to 0.6 V at >1 MHz
? Reference accuracy of ±1% throughout temperature range
? ˉF ˉAˉ ˉUˉ ˉLˉ ˉTˉ and Power OK pins for operating and protection
modes:
? Normal operation
? V FB low or high
? Overcurrent
? UVLO
? Thermal warning prior to TSD
? Thermal shutdown (TSD)
? LX–GND short protection
? Timing resistor open circuit protection
Continued on the next page…
Package: 20-contact QFN with exposed
thermal pad (suffix ES)
Approximate size
Description
The A8670 is a synchronous buck converter capable of
delivering up to 2 A. The A8670 utilizes valley current mode
control, allowing very short on-times to be achieved. This makes
it ideal for applications that require very low output voltages
relative to the input voltage, combined with high switching
frequencies. Valley current mode control inherently provides
improved transient response over traditional switcher schemes,
through the use of a voltage feedforward loop and frequency
modulation during large signal load changes.
The A8670 includes a comprehensive set of diagnostic flags,
allowing the host platform to react to a myriad of different
conditions. A fault output indicates when either the temp-
erature is becoming unusually high, or a single point failure
has occurred; for example, the switching node (LX) shorted to
ground, or the timing resistor going open-circuit. A Power OK
(POK) output is also provided after a fixed delay, to indicate
when the output voltage is within regulation. The A8670 is a
rugged solution, offering protection against input undervoltages,
Continued on the next page…
Applications
? Servers
? Point of load supplies
? Network and telecom
? Storage
Typical Application Diagram
V IN
12 V
R1
63.4 k Ω
C1
10 μ F
VIN
TON
ILIM
BOOT
A8670
LX
C2
10 nF
L1
3.6 μ H
C3
10 μ F
C4
10 μ F
VOUT
1.2 V
R5
10 k Ω
V pull-up
EN
R2
20 k Ω
R3
20 k Ω
FB
POK
FAULT
POK
FAULT
SS
COMP
R4
12 k Ω
R6
10 k Ω
C5
10 nF
C6
100 nF
BIAS
A GND PGN D
C7
1 nF
C8
39 pF
V IN = 12 V, V OUT = 1.2 V, and f SW = 700 kHz
For additional examples, see the Typical Applications section
A8670-DS, Rev. 2
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