参数资料
| 型号： | SC824ULTRT |
| 厂商： | Semtech |
| 文件页数： | 22/29页 |
| 文件大小： | 0K |
| 描述： | IC BATTERY MANAGEMENT |
| 标准包装： | 1 |
| 系列： | * |
| 其它名称： | SC824ULDKR |
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SC824
Applications Information (continued)
V VIN =8.1V, V BAT =3.0V
I BAT =700mA (Initially), P DISSIPATION =3.6W (Initially)
V IPRGM (1V/div)
I BAT (100mA/div)
V IPRGM =0V—
V VIN (2V/div)
I BAT (500mA/div)
I BAT =0mA—
V VIN (5V/div)
V BAT (2V/div)
V VIN =0V—
V VIN ,V BAT =0V—
I BAT =0mA—
1s/div
Figure 5 — Thermal Limiting Example
Note that the BAT output current is rapidly reduced to
limit the internal die temperature. It then continues to
decline as the circuit board temperature gradually rises,
further reducing the conduction of heat from the die to
the ambient environment. The fast thermal limiting
feature ensures compliance with CCSA YD/T 1591-2006,
Telecommunication Industrial Standard of the People’s
Republic of China — Technical Requirements and Test
M e t h o d o f C h a rg e r a n d I n t e r fa ce f o r M o b i l e
Telecommunication Terminal , Section 4.2.3.1.
Short Circuit Protection
The SC824 can tolerate a BAT pin short circuit to ground
indefinitely. The current into a ground short (while
V BAT < 1.8V) is approximately 10mA. For V BAT > 1.8V, normal
pre-charge current regulation is active.
A short circuit or too little programming resistance to
ground on the IPRGM pin (<< 2kΩ) will prevent proper
regulation of the BAT pin output current. Prior to enabling
the output a check of the IPRGM pin is performed to
ensure that there is suffi cient resistance to ground. A test
current is output on the IPRGM pin. If the test current
produces a voltage of sufficient amplitude, then the
output is enabled. An example with R IPRGM = 2.94kΩ is
illustrated in Figure 6, in which the test current is applied
for approximately 250μs to determine that there is no pin
short. If a short is detected, the test current persists until
the short to ground is removed, and then the charging
startup sequence will continue.
400μs/div
Figure 6 — IPRGM Pin Short-to-Ground Test During
Startup
A short to ground applied to the IPRGM pin while charg-
ing will also be detected, by a different mechanism. IPRGM
pin short-to-ground detection on the IPRGM pin forces
the SC824 into reset, turning off the output and clearing
the logical state, including the timer.
A short-to-ground on the IPRGM pin will halt charging
and prevent startup regardless of the mode selected. It is
indicated as a fault condition on the STATx pins. When the
IPRGM ground short is removed, the charger begins
normal operation automatically without input power
cycling.
Over-Current Protection
Over-current protection is provided in all modes of opera-
tion, including CV regulation. The output current is limited
to the programmed pre-charge current limit value when
the battery voltage is below the pre-charge threshold and
the fast-charge current limit value otherwise.
Logical State Machine
The SC824 logical behavior described in the preceding
sections is derived from two distinct state machines, as
illustrated in the following diagrams. The charger state
machine permits transitions to most states from most
other states, as shown. The multi-stage timer state
machine enforces a unidirectional flow. Once the timer
has advanced from one stage to the next, there is no
return to the previous stage except by a re-charge cycle, a
reset (by disabling and re-enabling the SC824), or by
cycling the input power off and on.
22
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