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参数资料
| 型号： | LTC3802EUH#TR |
| 厂商： | Linear Technology |
| 文件页数： | 8/28页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 32-QFN |
| 标准包装： | 2,500 |
| 系列： | PolyPhase® |
| PWM 型： | 电压模式 |
| 输出数： | 2 |
| 频率 - 最大： | 850kHz |
| 占空比： | 92% |
| 电源电压： | 3 V ~ 30 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 32-WFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
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LTC3802
TYPICAL PERFOR A CE CHARACTERISTICS
Supply Current vs Temperature
Supply Current vs Supply Voltage
10
I VCC
I PVCC
(NO LOAD)
10
T A = 25 ° C
I VCC
I PVCC (NO LOAD)
1
0.1
0.01
I BOOST1
I BOOST2
(NO LOAD)
I VCC
SHUTDOWN
V CC = V PVCC = V BOOST – V SW = 5V
1
0.1
0.01
I BOOST1, I BOOST2
(NO LOAD)
I VCC SHUTDOWN
–50 –25
0 25 50 75
100
125
3
3.5
4
4.5
5
5.5
6
TEMPERATURE ( ° C)
3802 G26
SUPPLY VOLTAGE (V)
3802 G27
PI FU CTIO S
(28-Pin SSOP/32-Pin QFN Package)
PV CC (Pin 1/Pin 29): Driver Power Supply Input. PV CC
provides power to the two BG drivers and must be con-
nected to an external voltage high enough to fully turn on
the external MOSFETs, QB1 and QB2. PV CC requires at
least a 10 μ F bypass capacitor directly to PGND.
BG1 (Pin 2/Pin 30): Channel 1 Controller Bottom Gate
Drive. The BG1 pin drives the gate of the bottom N-channel
synchronous switch MOSFET, QB1. BG1 is designed to
drive typically up to 10,000pF of gate capacitance.
BOOST1 (Pin 3/Pin 31): Channel 1 Controller Top Gate
Driver Supply. BOOST1 should be bootstrapped to SW1
with a 0.1 μ F capacitor. An external Schottky diode from
PV CC to BOOST1 creates a complete floating charge-
pumped supply at BOOST1. No other external supplies are
required.
TG1 (Pin 4/Pin 32): Channel 1 Controller Top Gate Drive.
The TG1 pin drives the top N-channel MOSFET with a
voltage swing equal to PV CC superimposed on the switch
node voltage SW1. TG1 is designed to drive typically up to
6000pF of gate capacitance.
SW1 (Pin 5/Pin 1): Channel 1 Controller Switching Node.
Connect SW1 to the switching node of the channel 1
converter. When the bottom MOSFET QB1 turns on, the
current limit comparator and the burst comparator
monitor the voltage at SW1. If the voltage drop across
MOSFET QB1 is too large, the controller enters current
limit; if it is too small, the switcher enters Burst Mode
operation. See Current Limit and Burst Mode Applica-
tions Information.
PGND (Pin 6/Pins 2, 3, 23, 24): Power Ground. The BG
drivers return to this pin. Connect PGND to a high current
ground node in close proximity to the sources of external
MOSFETs QB1 and QB2 and the V IN , PV CC and V OUT
bypass capacitors.
I MAX1 (Pin 7/Pin 4): Channel 1 Controller Current Limit
Set. The I MAX1 pin has an internal 10 μ A current source
pull-up, allowing the current limit and burst comparator
threshold to be programmed by a single external resistor
to SGND. See Current Limit and Burst Mode Applications
Information.
3802f
8
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