参数资料
型号: AT73C224-A
厂商: Atmel
文件页数: 62/75页
文件大小: 0K
描述: IC PWR MGMT ANALOG PMAAC 32QFN
标准包装: 490
应用: 手持/移动设备
电源电压: 2.8 V ~ 5.25 V
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 32-VFQFN 裸露焊盘
供应商设备封装: 32-QFN(5x5)
包装: 托盘
7.6
BUCK2: Step-down Converter
Table 7-6.
BUCK2 Electrical Characteristics
Symbol
VDD2
Fs
Parameter
Operating Supply Voltage
Converter Frequency
PWM mode
Conditions
Min
2.8
400
Typ
3.6
900
Max
5.25
1400
Unit
V
kHz
I LOAD
Load Current
0.5
A
VO2
Error
I SC
I STB
I MAX
I PWM-PSK
? v
T R
? V DC
? V DC
Output Voltage
Output Voltage Precision
Shutdown Current
Stand-by Current
Short Circuit Current
PWM – Pulse SKipping
Current Threshold
Ripple Voltage
Rise Time
Static Line Regulation
Static Load Regulation
BCK_VOLT register (@15) - Step 100mV
VDD2 > (VO2 + 0.2V)
BCK_CTROL register (@13), EN = 0
BCK_CTROL register (@13), EN = 1, clock not present
BCK_CFG register (@14)
Automatic mode- VDD2 = 3.6V- VO2 = 1.8V
PWM mode
Bandgap already started, slow-start power up selected
I LOAD = 500 mA, VDD2 from 2.8V to 5V
PWM mode
1 mA <iload<500 mA,
PWM mode
0.9 (1)
-10
1
1
20
70
10
1
80
40
3.4
10
6
50
2
V
%
μA
μA
A
mA
mV
ms
mV
mV
Note:
62
1. for device commanded in Dynamic Mode only. For devices commanded in Static Mode, the minimum voltage is 1.8V.
The BUCK2 is a Pulse Width Modulator (PWM) / Pulse-Skipping (PSK) synchronous regulator
that can be used to provide an accurate 0.9V to 3.4V programmable output voltage at 500 mA of
maximum load current.
Integrated current sensing is used to sense the DC/DC converter load current used for the over-
current circuit protection and for the PWM / PSK mode selector.
By default, the BUCK2 is in Automatic Mode: according to the load current value, the regulator is
either in Pulse-Skipping mode (light load) or in PWM mode (high load). In dynamic mode, the
user can select PWM or PSK mode, using the bits 4 and 5 of the BCK_CFG register (see Sec-
tion 6 Register Tables).
Note that the Automatic mode should not be used for output voltages below 1.8V.
AT73C224
6266A–PMAAC–08-Sep-08
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