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| 型号： | MAX8760ETL+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 14/39页 |
| 文件大小： | 0K |
| 描述： | IC CNTRLR QUICK PWM 40-TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 系列： | Quick-PWM™ |
| 应用： | 控制器，6 位 VID AMD 移动式 Turion? |
| 输入电压： | 4 V ~ 28 V |
| 输出数： | 2 |
| 输出电压： | 0.38 V ~ 1.55 V |
| 工作温度： | 0°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 40-WFQFN 裸露焊盘 |
| 供应商设备封装： | 40-TQFN-EP（6x6） |
| 包装： | 带卷 (TR) |
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Dual-Phase, Quick-PWM Controller for AMD
Mobile Turion 64 CPU Core Power Supplies
Pin Description
PIN
1
2
3
4, 5
6
7
8
9
10
11
12
13
NAME
TIME
TON
SUS
S0, S1
SHDN
OFS
REF
ILIM
V CC
GND
CCV
GNDS
FUNCTION
Slew-Rate Adjustment Pin. Connect a resistor from TIME to GND to set the internal slew-rate clock. A
150k ? to 15k ? resistor sets the clock from 100kHz to 1MHz, f SLEW = 500kHz x 30k ? /R TIME . During
startup and shutdown, the internal slew-rate clock operates at 1/4 the programmed rate.
On-Time Selection Control Input. This four-level input sets the K-factor value used to determine the DH_
on-time (see the On-Time One-Shot (TON) section): GND = 550kHz, REF = 300kHz, OPEN = 200kHz,
V CC = 100kHz
Suspend Input. SUS is a tri-level logic input. When the controller detects on-transition on SUS, the
controller slews the output voltage to the new voltage level determined by SUS, S0, S1, and D0–D5. The
controller blanks VROK during the transition and another 24 R TIME clock cycles after the new DAC code
is reached. Connect SUS as follows to select which multiplexer sets the nominal output voltage:
3.3V or V CC (high) = Suspend mode; S0, S1 low-range suspend code (Table 5)
REF = Suspend mode; S0, S1 high-range suspend code (Table 5)
GND = Normal operation; D0–D5 VID DAC code (Table 4)
Suspend-Mode Voltage-Select Inputs. S0, S1 are four-level digital inputs that select the suspend mode
VID code (Table 5) for the suspend mode multiplexer inputs. If SUS is high, the suspend mode VID code
is delivered to the DAC (see the Internal Multiplexers section), overriding any other voltage setting
(Figure 3).
Shutdown Control Input. This input cannot withstand the battery voltage. Connect to V CC for normal operation.
Connect to ground to put the IC into its 1μA (typ) shutdown state. During the transition from normal operation
to shutdown, the output voltage ramps down at 4 times the output-voltage slew rate programmed by the TIME
pin. In shutdown mode, DLM and DLS are forced to V DD to clamp the output to ground. Forcing SHDN to 12V
~ 15V disables both overvoltage protection and undervoltage protection circuits, disables overlap operation,
and clears the fault latch. Do not connect SHDN to >15V.
Voltage-Divider Input for Offset Control. For 0 < V OFS < 0.8V, 0.125 times the voltage at OFS is
subtracted from the output. For 1.2V < V OFS < 2V, 0.125 times the difference between REF and OFS is
added to the output. Voltages in the 0.8V < V OFS < 1.2V range are undefined. The controller disables the
offset amplifier during suspend mode (SUS = REF or high).
2V Reference Output. Bypass to GND with a 0.22μF or greater ceramic capacitor. The reference can
source 100μA for external loads. Loading REF degrades output voltage accuracy according to the REF
load regulation error.
Current-Limit Adjustment. The current-limit threshold defaults to 30mV if ILIM is connected to V CC . In
adjustable mode, the current-limit threshold voltage is precisely 1/20 the voltage seen at ILIM over a
0.2V to 1.5V range. The logic threshold for switchover to the 30mV default value is approximately V CC -
1V
Analog Supply Voltage Input for PWM Core. Connect V CC to the system supply voltage (4.5V to 5.5V)
with a series 10 ? resistor. Bypass to GND with a 1μF or greater ceramic capacitor, as close to the IC as
possible.
Analog Ground. Connect the MAX8760’s exposed pad to analog ground.
Voltage Integrator Capacitor Connection. Connect a 47pF to 1000pF (150pF typ) capacitor from CCV to
analog ground (GND) to set the integration time constant.
Ground Remote-Sense Input. Connect GNDS directly to the CPU ground-sense pin. GNDS internally
connects to an amplifier that adjusts the output voltage, compensating for voltage drops from the
regulator ground to the load ground.
14
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