ATR0622-EK1 ATMEL [ATMEL Corporation], ATR0622-EK1 Datasheet - Page 28

• Manufacturer Part Number: ATR0622-EK1
• Description: GPS Baseband GPS Baseband
• Manufacturer: ATMEL [ATMEL Corporation]

11. LDO18
12. LDOBAT and Backup Domain
28
ATR0621P
The LDO18 is a built in low dropout voltage regulator which can be used if the host system does
not provide the core voltage VDD18.
Table 11-1.
For well-defined start up of LDO18, LDO_IN needs to be connected to LDOBAT_IN.
The LDOBAT is a built in low dropout voltage regulator which provides the supply voltage
VBAT18 for the RTC, backup SRAM, P9, P13, P22, P31, NSLEEP and NSHDN. The LDOBAT
voltage regulator switches in battery mode if LDOBAT_IN falls below 1.5V.
Table 12-1.
Parameter
Supply voltage LDO_IN
Output voltage
(LDO_OUT)
Output current
(LDO_OUT)
Current consumption
Current consumption
*) Type means: A = 100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design
parameter
Parameter
Supply voltage
LDOBAT_IN
Supply voltage VBAT
Output voltage (VBAT18) If switch connects to LDOBAT_IN.
Output current (VBAT18) No external load allowed
Current consumption
LDOBAT_IN
Current consumption
VBAT
Current consumption
*) Type means: A = 100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design
parameter
Note:
(1)
1. If no current is caused by outputs (pad output current as well as current across internal
(1)
pull-up resistors)
Electrical Characteristics of LDO18
Electrical Characteristics of LDOBAT
Conditions
After startup, no load, at room
temperature
Standby mode (LDO_EN = 0), at
room temperature
Conditions
After startup (sleep/backup mode), at
room temperature
After startup (backup mode and
LDOBAT_IN = 0V), at room
temperature
After startup (normal mode), at room
temperature
Min.
1.65
2.3
Min.
1.65
2.3
1.5
Typ.
1.8
1
Typ.
1.8
Max.
1.95
3.6
80
80
5
Max.
1.95
3.6
3.6
1.5
1.5
15
10
Unit
mA
4890H–GPS–08/08
µA
µA
V
V
Unit
mA
mA
µA
µA
V
V
V
Type*
Type*
D
A
A
A
A
D
D
D
A
A
A
C